PA 28 140/150/160/180/235 And 28R 180/200 CHEROKEE PIPER SERVICE MANUAL Pa28

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CHEROKEE

SERVICE
MANUAL
CARD1 OF4
PA-28-140
PA-28-150
PA-28-160
PA-28-180
PA-28-235
PA-28R-180
PA-28R-200

PIPERAIRCRAFT
CORPORATION
(PARTNUMBER
753586)

lA1

PIPER CHEROKEESERVICE MANUAL
AEROFICHE EXPLANATION AND REVISION STATUS
The Service Manual information incorporated in this set of Aerofiche cards has been arranged in accordance
with the general specifications of Aerofiche adopted by the General Aviation Manufacturer's Association,
(GAMA). The information compiled in this Aerofiche Service Manual will be kept current by revisions distributed
periodically. These revisions will supersede all previous revisions and will be complete Aerofiche card replacements and shall supersede Aerofiche cards of the same number in the set.
Conversion of Aerofiche alpha/numeric code numbers:
First number is the Aerofiche card number.
Letter is the horizontal line reference per card.
Second number is the vertical line reference per card.
Example: 2J16 = Aerofiche card number two of given set, Grid location J16.
To aid in locating the various chapters and related service information desired, the following is provided:
1. A complete manual Table of Contents is for all fiche in this set.
2. A complete list of Illustrations is given and follows the Table of Contents.
3. A complete list of Tables is given for all fiche in this set and follows the list of Illustrations.
4. A complete list of paragraph titles and appropriate Grid location numbers is given at the beginning of each
Chapter relating to the information within that Chapter.
5. Identification of Revised Material:
Revised text and illustrations are indicated by a black vertical line along the left-hand margin of the
frame, opposite revised, added or deleted material. Revision lines indicate only current revisions with changes and
additions to or deletions of existing text and illustrations. Changes in capitalization, spelling, punctuation, indexing,
the physical location of the material or complete page additions are not identified by revision lines.
6. Revisions to this Service Manual 753 586 issued August 16, 1972 are as follows:
Effectivity
ORG720816
CR810115
PR810803
PR831003
PR840423
PR860115
IR860730
IR870506
IR950215*

Publication Date

Aerofiche Card Effectivity

August 16, 1972
January 15, 1981
August 3, 1981
October 3, 1983
April 23, 1984
January 15, 1986
July 30, 1986
June 12, 1987
February 15, 1995

--1,2, 3 and 4
1, 2, 3 and 4
1, 2, 3 and 4
1, 2, 3 and 4
1 and 3
1
1
1 and 2

* INTERIM CHANGE
Chapters II, III, and IV of Card 1, and Chapters VIIA and VIII of Card 2 have been revised.
There are no other changes included in this interim change revision. Please discard your
current cards 1 and 2, and replace them with the revised ones. DO NOT DISCARD CARDS
3 AND 4.
The date on Aerofiche cards should not be earlier than the date noted for the respective card effectivity. Consult
the latest card in this series for current Aerofiche card effectivity.

1A2

TABLE OF CONTENTS

AEROFICHE
CARD
NO.1
INTRODUCTION

INTRODUCTION

AIX
IIIX
1A24

HANDLING
...............
INSPECTION

IX
STRUCTURES
X
2A8

V........................ 2A8
VI......
. ........
(PA-28R)
LANDING
GEAR
AND
VIIA

VIIIA

POWER
(PA-28R)
PLANT

2K2
VIIA

VIII

AEROFACE
CARD
NO.3
VIIIA
. ........

IX

. ..

IIA
IA

PLANT
(PA-28R)

.

A

Al

AEROFACE
CARD
NO.

4A8

XI

II
NI

XIII
XIV

ACCESSORIES
AND
UTILITIES

1A3

I

1A4
INTENTIONALLYLEFT BLANK

PIPER CHEROKEE SERVICE MANUAL

LIST OF ILLUSTRATIONS
Figure
2-1.
2-2.
2-3.
2-4.
2-5.
2-6.
2-7.
2-8.
2-9.
2-10.
2-11.
2-12.
2-13.
2-14.
2-15.
2-16.
2-17.
2-18.
2-19.
2-20.

Aerofiche
Grid No.
Three View of Cherokee, PA-28-140. -150, -160, -180, Serial Nos.
28-1 to 28-1760 incl., Flite Liner, Serial Nos. 28-7125174
and up............................
......................
B4
Three View of Cherokee, PA-28-140, Serial Nos.
28-7225001 and up ......
...
.........
.............
B5
Three View of Cherokee, PA-28-150. -160. -180, Serial Nos.
28-1761 to 28-4377 incl ...............
.........
......
1B6
Three View of Cherokee. PA-28-180, Serial Nos. 28-4378
to 28-7105244 inc ..............
...............
lB7
Three View of Cherokee. PA-28-180, Serial Nos. 28-7205001
to 28-7205328 incl .........................................
B8
Three View of Cherokee. PA-28-180. Serial Nos.
28-7305001 and up ........................................
1B9
Three View of Cherokee, PA-28-235. Serial Nos. 28-10000
to 28-11039 incl .....................
..
......
............ 1B10
Three View of Cherokee, PA-28-235. Serial Nos. 28-11040
to 28-7110042 incl.........................................
1B11
Three View of Cherokee, PA-28-235. Serial Nos. 28-7210001
to 28-7210033 incl .........................................
1B12
Three View of Cherokee, PA-28-235. Serial Nos.
28-7310001 and up ........................................
IB13
Three View of Cherokee. PA-28R-180, -200,
-180 Serial Nos. 28-30005 to 28-7130019 incl.
-200 Serial Nos. 28-30482 to 28-7135238 incl ...............
1B14
Three View of Cherokee, PA-28R-200, Serial Nos.
28-7235001 and up ..........
....
............
.........
IB15
Station Reference Lines. PA-28-140. -150, -160, -180. Serial Nos.
28-1 to 28-1760 incl.: Flite Liner. Serial Nos. 28-7125174
and up ..................................................
C4
Station Reference Lines. PA-28-140, Serial Nos. 28-7225001
and up ..................................................
IC
Station Reference Lines, PA-28-150, -160. -180, Serial Nos.
28-1761 to 28-4377 incl ..................................
C6
Station Reference Lines, PA-28-180. Serial Nos. 28-4378
to 28-7105244 incl .......................................
IC7
Station Reference Lines. PA-28-180. Serial Nos. 28-7205001
to 28-7205328 incl ........................................
IC8
Station Reference Lines. PA-28-180, Serial Nos. 28-7305001
and up.
IC9
Station Reference Lines. PA-28-235. Serial Nos. 28-10000
to 28-11039 incl ..........
............................
1C10
Station Reference Lines, PA-28-235. Serial Nos. 28-11040
to 28-7110042 incl ........................................
1C11

Reissued: 1/15/81

1A5
1A5

PIPER CHEROKEE SERVICE MANUAL

LIST OF ILLUSTRATIONS

(cont.)

Figure
2-21.
2-22.
2-23.
2-24.
2-25.
2-26.
2-27.
2-28.
2-29.
2-30.
2-31.
2-32.
2-33.
2-34.
2-35.
2-36.
2-37.
2-38.
2-39.
2-40.
2-41.
2-42.
2-43.
2-44.
2-45.
2-46.
2-47.
2-48.
2-49.
2-50.
2-51.

Aerofiche
Grid No.
Station Reference Lines, PA-28-235, Serial Nos. 28-7210001
to 28-7210033 incl ........................................
.
Station Reference Lines. PA-28-235, Serial Nos. 28-7310001
and up ..................................................
Station Reference Lines, PA-28R-180,-200,
-180 Serial Nos. 28-30005 to 28-7130019 incl.
-200 Serial Nos. 28-30482 to 28-7135238 incl ..................
Station Reference Lines, PA-28R-200, Serial Nos. 28-7235001
and up ..................................................
Access Plates and Panels, PA-28-140 and Flite Liner. Serial
Nos. 28-7225001 and up as noted ...........................
Access Plates and Panels, PA-28-150, -160, -180 ....
..............
Access Plates and Panels, PA-28-235 .................
.. .........
Access Plates and Panels, PA-28R ..............................
Identification of Aircraft Fluid Lines ............................
Torque Wrench Formula ......................................
Removing Cherrylock Rivets ...................................
Jacking Arrangement .........................................
Weighing Airplane .............................................
Leveling Longitudinally .......................................
Leveling Laterally ............................................
Servicing Points, PA-28-140 ...................................
Servicing Points, PA-28-150,-160, -180 .......................
Servicing Points, PA-28-235 ...................................
Servicing Points, PA-28R .....................................
Main Gear Oleo Struts (Cutaway View), PA-28-140;
PA-28-150,-160,-180; PA-28-235 ...........................
Fuel Strainer. PA-28-140; PA-28-150, -160, -180; and PA-28R......
Fuel Selector and Filter, PA-28-235 ............................
Lubrication Chart (Landing Gear, Main), PA-28-140, -150,
-160, -180 and -235 .......................................
Lubrication Chart (Landing Gear, Main), PA-28R-180
and -200 ...............................................
Lubrication Chart (Landing Gear, Nose), PA-28-140, -150.
-160. -180 and -235 .......................................
Lubrication Chart (Landing Gear, Nose), PA-28R-180 and -200 ....
Lubrication Chart (Control System) ............................
Lubrication Chart (Control System) (cont.) ......................
Lubrication Chart (Control System) (cont.) ......................
Lubrication Chart (Control System) (cont.) .
.....................
Lubrication Chart (Cabin Door. Baggage Door and Seat) .........

Revised: 8/3/81

1A6

1C12
1C13
1C14
IC15
1C16
C17
C18
1C19
1D7
1C21
1D8
1D9
1D10

1
1D11
1D20

1
1D22
1d23
1D24
1E9
1E9
1E17
E18
1E19

1
I E21
1E22
1E23
1E24
IF1

PIPER CHEROKEESERVICE MANUAL

LIST OF ILLUSTRATIONS (cont.)
Figure

2-52.
2-53.
2-54
3-1
3-2
3-3
3-4
3-5
3-6
3-7
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
4-10
4-11
4-12
4-13
4-14
4-15
4-16
4-17
4-18
4-19
4-20
4-21
4-22
4-23
4-24
4-25
4-26
5-1
5-2
5-3
5-4
5-5

Aerofiche
Grid No.
Lubrication Chart (Power Plant, Propeller and Control Pivot Points) ....................... 1F2
Lubrication Chart (Back-Up Extender and Fuel Selector) ........................................1F3
Lubrication Chart (Air Conditioning Condenser) ...................................................... F4
Typical Muffler Fatigue Areas . ................................................... .................... 1F10
Exhaust System Inspection Points ............................................................................. 1F11
Exhaust System Inspection Points ............................................................................. F12
Exhaust System Installation, PA-28R-180,-200 ........................................................IF14
Control Wheel Inspection Points ...............................................................................1F15
Flap Control Cable Attachment Bolt Inspection........................................................ 1Fl6
Inspection of Main Landing Gear Torque Link ......................................................... 1Fl7
Aileron and Flap Installation ....................................................................................1G19
Wing Installation .....................................................................
1G23
Methods of Securing Control Cables ........................................
.......... 1H7
Empennage Group Installation ................................................................................. 1H
Windshield Installation (Typical)...............................
..........................1H16
Side Window Installation, Single Pane (Typical) ......................................................1H18
Side Window Installation, Double Pane (Typical)....................................................1H18
Door Snubber Installation .
......................................................... 1H20
Seat Back Lock ........................................
1H24
..................
Skin Materials and Thickness .................................................................................... 1I1
Surface Scratches, Abrasions or Ground-in-Dirt.......................................................1I8
Deep Scratches, Shallow Nicks and Small Holes ...................
.............
1...................
119
Mixing of Epoxy Patching Compound ....................................................
119
Welding Repair Method .............................................................................................
Repairing of Cracks ...................................................................................................1I11
Various Repairs .......................................................................................................... 1I12
Repair of Stress Lines ...............................................................................................1I13
Repair of Impacted Damage ......................................................................................1I13
Control Surface Balance Tool ....................................................................................1I20
Aileron and Rudder Balance Configuration ..............................................................1Ii21
Stabilator Balance ......................................................................................................1122
Wing Rib Modification ..............................................................................................1I24
Balance Weight Assembly Installation ...................................................................... 1124
Fabricated Tool for Baggage Door Lock ................................................................... J
Additional Drain Holes in Stabilator ........................................................................1J2
Baggage Compartment Inspection Holes Cutout Details .......................................... J5
Control Column Assembly, PA-28-140,-150,-160, -180 and 235 .............................2A15
Control Column Assembly, PA-28R ..........................................................................2A16
Aileron Controls.........................................................................................................2A20
Bellcrank Rigging Tool, PA-28-140, -150, -160, -180, -235 .....................................2A23
Bellcrank Rigging Tool, PA-28R ...............................................................................2A23

Interim Revision: February 15, 1995

1A7

PIPER CHEROKEE SERVICE MANUAL

LIST OF ILLUSTRATIONS (cont.)
Figure
5-6.
5-7.
5-8.
5-9.
5-10.
5-11.
5-12.
5-13.
5-14.
5-15.
5-16.
5-17.
5-18.
5-19.
5-20.
5-21.
5-22.
5-23.
5-24.
5-25.
6-1.
6-2.
6-3.
6-4.
6-5.
6-6.
6-7.
6-8.
6-9.
6-10.
6-11.
7-1.
7-2.
7-3.
7-4.
7-5.
7-6.
7-7.
7-8.
7-9.

Aerofiche
Grid No.
Aileron Rigging Tool .........................................
Stabilator Rigging Tool .......................................
Stabilator Controls .......................................
....
Stabilator Trim Control (Overhead Control) ...
.............
Methods of Securing Trim Cables ..............................
Stabilator Trim Control (Floor Control) .........................
Rudder and Steering Pedal Assembly ...........................
Rudder Controls .............................................
Rudder Rigging Tool ....................................
Clamping Rudder Pedals ......................................
Rudder and Stabilator Travel Adjustments ...
...................
Rudder Trim Control .........................................
Flap Controls ...................
.............................
Flap Step Adjustment .........................................
Flap Rigging Tool ............................................
Fabricated Aileron Bellcrank Rigging Tool ......................
Correct Method of Installing Rod End Bearings ..................
Fabricated Aileron and Flap Rigging Tool .......................
Fabricated Stabilator Rigging Tool .............................
Fabricated Rudder Rigging Tool ...............................
Schematic Diagram of Hydraulic System
...
..............
Hydraulic System Installation ..................................
Hydraulic Pump/Reservoir. Exploded View ......................
Test and Adjustments of Hydraulic Pump .............
...............
Pump Shock Mounts .........................................
Checking Aligning Brackets of Gear Back-Up Extender
Actuator ................................................
Gear Back-Up Extender Actuator ..............................
Nose Gear Actuator Cylinder ..................................
End Gland Locking Device ....................................
Main Gear Actuating Cylinder .................................
Gear Back-Up Extender Actuator Aligning Tool
..................
Nose Gear Oleo Strut Assembly ................................
Nose Gear Installation ........................................
Clamping Rudder Pedals in Neutral Position .....................
Rudder Pedals at Neutral Angle ..
........................ ...
Main Gear Oleo Strut Assembly. PA-28-140, -150, -160
and -180 ................................................
Main Gear Oleo Strut Assembly, PA-28-235 .....................
Main Gear Installation ...
........................
..........
Nose Wheel Assembly .........................................
Main Wheel Assembly ........................................

Revised: 4 23/84

1A8
1A8

2A24
2B3
2B4
2B8
2B10
2B18
2B24
2C4
2C5
2C5
2C6
2C8
2C10
2C14
2C12
2C15
2C15
2C16
2C17
2C18
2D5
2D6
2D10
2D14
2D16
2D 17
2D21
2E2
2E4
2E5
2E20
2F2
2F6
2F8
2F8
2F13
2F15
2F19
2F21
2F23

PIPER CHEROKEE SERVICE MANUAL

LIST OF ILLUSTRATIONS (cont.)
Figure
7-10.
7-11.
7-12.
7-13.
7-14.
7-15.
7-16.

7-17.

7-18.
7-19.
7-20.
7-21.
7-22.
7-23.
7-24.
7-25.
7A-I.
7A-2.
7A-3.
7A-4.
7A-5.
7A-6.
7A-7.
7A-8.
7A-9.
7A-10.
7A-11.
7A-12.
7A-13.
7A- 14.
7A-15.
7A-16.
7A-17.
7A-18.

Aerofiche
Grid No.
Wheel Brake Assembly ........................................
Removal of Anchor Bolt ......................................
Installation of Anchor Bolt ....................................
Brake Disc Minimum Thickness ................................
Brake System Installation .....................................
Brake Master Cylinder (Hand Brake). PA-28-150. -160.
Serial Nos. 28-1 to 28-250 incl .............................
Brake Master Cylinder (Hand Parking Brake), PA-28-140.
Serial Nos. 28-20002 to 28-21036 incl.: PA-28-150.
-160. -180. Serial Nos. 28-251 to 28-2700 incl.:
PA-28-235. Serial Nos. 28-10003 to 28-10697 incl ............
Brake Master Cylinder (Hand Parking Brake). PA-28-140.
Serial Nos. 28-21037 and up: PA-28-150. -160. -180.
Serial Nos. 28-2701 and up: PA-28-235. Serial Nos.
28-10698 and up..........................................
Parking Valve. PA-28-150. -160. Serial Nos. 28-1 to
28-250 incl ...............................................
Toe Brake Installation ........................................
Brake Cylinder 10-20. 10-27. 17000 (Toe Brake) ..................
Brake Cylinder 10-30 (Toe Brake) ..............................
Bleeding Brake (Gravity) ......................................
Bleeding Brake (Pressure) .........
............................
Orifice Replacement Tool .....................................
Retainer Ring Tool ...........................................
Nose Gear Oleo Strut Assembly ...............................
Nose Gear Installation ........................................
Nose Gear Adjustment (Without Gear Up Stop) ..................
Nose Gear Adjustment (With Gear Up Stop) ......
...............
Clamping Rudder Pedals in Neutral Position .....................
Rudder Pedals at Neutral Angle ................................
Nose Gear Door Retraction Mechanism .............
..............
Main Gear Oleo Strut Assembly ...............................
Main Gear Installation .......................................
Aligning Main Gear ..........................................
Adjustment of Nose Gear Down Limit Switch ....................
Adjustment of Main Gear Down Limit Switch ...................
Wiring Diagram of Landing Gear Electrical Circuit ...............
Throttle Warning Switches ....................................
Nose Wheel Assembly..........................................
Main Wheel Assembly ........................................
Wheel Brake Assembly ....................
...................
Brake Disc Minimum Thickness ................................

Revised: 8 3 81

1A9
1A9

2G1
2G2
2G3
2G5
2G5
2G8

2G8

2G9

.

.

2G11
2G12
2G14
2G 15
2G 18
2G 18
2G23
2G24
2H9
2H 12
2H 16
2H 17
2H 19
2H19
2H20
211
214
2110
2115
2115
2117
2119
2122
2123
2J1
2J3

PIPER CHEROKEE SERVICE MANUAL

LIST OF ILLUSTRATIONS

(cont.)

Figure
7A-19.
7A-20.
7A-21.
7A-22.
7A-23.
7A-24.
7A-25.
7A-26.
8-1.
8-2.
8-3.
8-4.
8-5.
8-6.
8-7.
8-8.
8-9.
8-10.
8-11.
8-12.
8-13.
8-14.
8-15.
8-16.
8-17.
8-18.
8-19.
8-20.
8-21.
8A-1.
8A-2.
8A-3.
8A-4.
8A-5.
8A-6.
8A-7.
8A-8.
8A-9.
8A-10.

Aerofiche
Grid No.
Brake System Installation .....................................
Brake Master Cylinder (Hand Parking Brake) ...................
Toe Brake Installation ........................................
Brake Cylinder (Toe Brake) (10-20. 10-27. 17000) .................
Brake Cylinder (Toe Brake) (10-30) .............................
Bearing Installation ...........................................
Nose Gear Ser ice Tolerances. PA-28R ..........................
Main Gear Service Tolerances. PA-28R .......
..................
Typical Nicks and Removal Method ............................
Propeller Installation (Constant Speed). PA-28-235 ...............
Propeller Installation .........................................
Adjustment of Propeller Control. PA-28-235 ...................
Propeller Governor. PA-28-235 ......
.......................
Engine Installation. PA-28-140. -150. -160. -180.
Serial Nos. 28-1 to 28-1760 ...............................
Engine Installation. PA-28-140. -150. -160. -180.
Serial Nos. 28-1761 and up......
.........
.............
Engine Shock Mount Installation. PA-28-140.
Serial Nos. 28-25000 and up ...........................
....
Engine Installation. PA-28-235 .................................
Adjustment of Engine Controls .................................
Carburetor. PA-28-140. -150. -160 ............................
..
Carburetor. PA-28-180. -235 ...................................
Magneto Inspection ...........................................
Contact Spring Inspection .....................................
Impulse Coupling ............................................
Magneto Timing Marks .......................................
Timing Pointer ..............................................
Timing Kit Installed ..........................................
Breaker Compartment With Cast Timing Marks ..................
Removing Spark Plug Frozen to Bushing ........................
Ignition Switch Wiring Positions ...........................
....
Propeller Installation .........................................
Typical Nicks and Removal Method ............................
Propeller Governor ...........................................
Engine Installation. PA-28R-180 ...............................
Engine Installation. PA-28R-200 ...............................
Adjustment of Engine Controls .................................
Fuel Injector .................................................
Schematic Diagram of RSA Fuel Injection System ................
Fuel-Air Bleed Nozzle .........................................
Contact Points ...............................................

Revised: 8 3 81

1A10

2J3
2J5
2J6
2J8
2J10
2J11
2J20
2J23
2K8
2K8
2K9
2K 13
2K 13
2K16
2K17
2K 18
2K22
2K24
2L3
2L3
2L5
2L6
2L6
2L7
2L7
2L8
2L8
2L13
2L16
3A12
3A13
3A16
3A19
3A21
3B1
3B3
3B4
3B6
3B8

PIPER CHEROKEE SERVICE MANUAL

LIST OF ILLUSTRATIONS (cont.)
Figure
8A-11.
8A-12.
8A-13.
8A-14.
8A-15.
8A-16.
8A-17.
8A-18.
8A-19.
8A-20.
8A-21.
8A-22.
8A-23.
8A-24.
8A-25.
8A-26.
8A-27.
8A-28.
8A-29.
8A-30.
8A-31.
8A-32.
9-1.
9-2.
9-3.
9-4.
9-5.
9-6.
9-7.
9-8.
9-9.
9-10.
9-11.
9-12.
9-13.
9-14.
10-1.
10-2.

Aerofiche
Grid No.
Rotor Holding Tool Installed ..................................
Timing Kit Installed .............
.....................
Aligning Timing Marks .......................................
Checking Flyweight Clearance of Impulse Coupling .............
Engine Timing Marks .
.................
. .....................
Magneto Adjustment Limits .
..............................
.
Magneto Timing Marks .
......................................
Removing Spring From Lead Assembly
.
. ............
Assembly Tool .
..............................................
Using Assembly Tool .........................................
Measuring Lead Assembly Length .
.............................
Cutting Metallic Braid From End of Lead .......................
Unbraiding Metallic Shielding ................................
Forming Shielding Around Ferrule ......
..........
.......
Ferrule Seating Tool ....
...
...
.....
..............
Needle ......................................................
Measuring Wire From Top of Ferrule .
.
................
Installing Grommet Over Lead Assemblies ...
.............
Lead Assembly Installed in Grommet .
..........................
Wire Doubled Over For Installation of Eyelet .....
.............
Removing Spark Plug Frozen to Bushing ........
..............
Ignition Switch Wiring Positions .
..............................
Fuel System Diagram, PA-28-140, -150, -160. -180 ...
..........
.
Fuel System Diagram. PA-28-235. Serial Nos. 28-10003
to 28-10719 inc ...........................................
Fuel System Diagram. PA-28-235. Serial Nos. 28-10720 and up....
Fuel System Diagram. PA-28R.................................
Deleted .....................
Fuel Quantity Transmitter (P N 62037-00) .........
.
Fuel Quantity Transmitter (P/N 68101-00) .
......................
Fuel Selector and Filter. PA-28-235 .
............................
Fuel Filter. PA-28-235
......
...................
Fuel Filter Bowl and Screen. PA-28-140, -150, -160, -180
and PA-28R.............................................
Plunger Fuel Pump (Early). PA-28-150, -160, -180 . ..........
Plunger Fuel Pump (Late), PA-28-140, -150, -160. -180, -235 .......
Engine Primer ...............................................
Fabricated Fuel Quantity Transmitter Checking Jig .
.............
Instrument Panel, PA-28-140, Serial Nos. 28-25000 to
28-26956 incl..........................
..................
Instrument Panel. PA-28-140, Serial Nos. 28-7125001 to
28-7325684 inc . ..........................................

Revised: 8/3/81

lA11
1All

3B10
3B10
3B11
3B12
3B13
3B14
3B14
3B16
3B16
3B 17
3B17
3B18
3B18
3B19
3B19
3B19
3B20
3B20
3B20
3B20
3B22
3B24
3CII
3C12
3C13
3C14
3C21
3C21
3C24
3DI
3D3
3D6
3D6
3D12
3D17
3E4
3E5

PIPER CHEROKEE SERVICE MANUAL

LIST OF ILLUSTRATIONS (cont.)
Figure
10-3.
10-4.
10-5.
10-6.
10-7.
10-8.
10-9.
10-10.
10- 11.
10-12.
10-13.
10-14.

10-15.
10-16.
10-17.
10-18.
10-19.
10-20.
10-21.
11-1.
11-2.
11-3.
11-4.
11-5.
11-6.
11-7.
11-8.
11-9.
11-10.
11-11.

Aerofiche
Grid No.
Instrument Panel. PA-28-140. Serial Nos. 28-7425001 and up ......
Instrument Panel .............................................
Instrument Panel. PA-28-150. -160. -180. Serial Nos. 28-1761
to 28-4377 incl ...........................................
Instrument Panel. PA-28-180. Serial Nos. 28-4378 to
28-7205328 incl ..........................................
Instrument Panel. PA-28-180. Serial Nos. 28-7305001 to
28-7305611 incl ..........................................
Instrument Panel. PA-28-180. Serial Nos. 28-7405001 and up ......
Instrument Panel. PA-28-235. Serial Nos. 28-10720 to
28-11039 inc .............................................
Instrument Panel. PA-28-235. Serial Nos. 28-11040 to
28-7210033 inc ...........................................
Instrument Panel. PA-28-235. Serial Nos. 28-7310001 to
28-7310187 incl ..........................................
Instrument Panel. PA-28-235. Serial Nos. 28-7410001 and up......
Instrument Panel. PA-28R-180. Serial Nos. 28-30005 to
28-30879 incl ............................................
Instrument Panel. PA-28R-180. Serial Nos. 28-30880 to
28-7130019 incl.: PA-28R-200. Serial Nos. 28-30482.
28-35001 to 28-35830 incl. and 28-7135001 to
28-7135238 incl ..........................................
Instrument Panel. PA-28R-200. Serial Nos. 28-7235001 to
28-7335455 incl ..........................................
Instrument Panel. PA-28R-200. Serial Nos. 28-7435001 and up.....
Warning Light Pressure Switch .................................
Typical Pitot Static System. PA-28-140. -150. -160. -180. -235.
PA-28R-180 and 200......................................
EGT Probe Location. PA-28R-180 and 200 ......................
EGT Probe Location. PA-28-235 ...............................
EGT Probe Location. PA-28-150. -160. -180. S N 1761 and up.....
Generator and Starter System ..................................
Generator Wiring Diagram ....................................
Sectional View of Generator ...................................
Current Voltage Regulator .............................
Use of Riffler File to Clean Contact Points ......................
Voltage Regulator Air Gap .......................
Checking Voltage Setting Fixed Resistance Method ...............
Checking Voltage Setting Variable Resistance Method ............
Adjusting Voltage Regulator Setting ............................
Cutout Relay Air Gap Check and Adjustment ...................
Cutout Relay Point Opening Check and Adjustment ..............

Revised: 8 3 81

1A12
1A12

3E6
3E7
3E8
3E9
3E10
3E11
3E12
3E13
3E14
3E15
3E16

3E17
3E18
3E19
3E23
3F4
3F24
3GI
3G2
4A 18
4A19
4A22
4B7
4B10
4B 10
4B 11
4B I
4B 12
4B14
4B14

PIPER CHEROKEE SERVICE MANUAL

LIST OF ILLUSTRATIONS (cont.)
Figure
11-12.
11-13.
11-14.
11-15.
11-16.

11-17.

11-18.
11-19.
11-20.
11-21.
11-22.
11-23.
11-24.
11-25.
11-26.
11-27.
11-28.
11-29.
11-30.
11-31.
11-32.
11-33.
11-34.
11-35.
11-36.
11-37.
11-38.
11-39.
11-40.
11-41.
11-42.
11-43.
11-44.
11-45.
11-46.

Aerofiche
Grid No.
Checking Cutout Relay Closing Voltage .........................
AdJustment of Cutout Relay Closing Voltage ..................
Checking Current Regulator. Load Method ......................
Checking Current Regulator. Jumper Lead Method ...............
Alternator and Starter System.
PA-28-140. Serial Nos. 28-20000 to 28-24999 incl.:
PA-28-150. -160. Serial Nos. 28-508 to 28-3643 incl.:
PA-28-180. Serial Nos. 28-671 to 28-3643 incl.:
PA-28-235. Serial Nos. 28-10002 to 28-10762 incl ............
Alternator and Starter System.
PA-28-140. Serial Nos. 28-25000 and up:
PA-28-150. -160. -180. Serial Nos. 28-3644 and up:
PA-28-235. Serial Nos. 10763 and up and PA-28R............
Lamp-Bank Load ..........
.................................
Checking Field Circuit ......
..................................
Testing Field Circuit ..........................................
Testing Rectifiers (Positixe) ....................................
Testing Rectifiers (Negative) ...................................
C-3928 Fixtures and Adapters ..................................
Removing Rectifiers .....
..............................
.....
Installing Rectifiers .....
......................................
Soldering Rectifier Lead .......................................
Testing Stator Coils .........................................
Removing End Bearing ........................................
Installing End Bearing .....
............................
....
Removing Drive Pulley .......................................
Removing Drive End Bearing ..................................
Removing Slip Ring ......................
..................
Aligning Slip Ring ..........................................
Installing Slip Ring ...........................................
Installing Retainer ...........................................
Solder Points ................................................
Installing Drive End Shield and Bearing (Typical) ................
Installing Pulley .....................
......................
Meter Connections for Alternator Performance Test ..............
Voltage Regulator ............................................
Checking Air Gap ............................................
Voltage Regulator Fusible Wires ...............................
Voltage Regulator Resistance Units .............................
No-Load Test Hookup ........................................
Lock Torque Test Hookup ...................................
Resistance Test Hookup .......................................

Revised: 8 3 81

1A13
1A13

4B15
4B15
4B16
4B16

4B20

4B21
4B23
4B24
4B24
4C2
4C3
4C4
4C4
4C5
4C6
4C7
4C9
4C9
4C10
4C10
4C 11
4C11
4C12
4C12
4C13
4C14
4C 14
4C17
4C19
4C19
4C20
4C20
4D2
4D3
4D3

PIPER CHEROKEE SERVICE MANUAL

LIST OF ILLUSTRATIONS

(cont.)

Figure
11-47.
11-48.
11-49.
11-50.
11-51.
11-52.
11-53.
11-54.
thru
11-70.
11-71.
11-72.
11-73.
11-74.
11-75.
11-76.
11-77.
11-78.
11-79.
11-80.
11-81.
11-82.
11-83.
11-84.
11-85.
thru
11-143.
11-144.
12-1.
12-2.
12-3.
13-1.

13-2.
13-3.

Aerofiche
Grid No.
Exploded View of Gear Reduction Starting Motor ................
Turning Starting Motor Commutator ...........................
Testing Motor Armature for Shorts .............................
Testing Motor Field for Grounds .............................
No-Load Test Hookup .....
.
.......................
Stall Torque Hookup .........................................
Terminal Block ............................................
For Index to these Figures, see Table XI-I, Index - Electrical
System Schematics
Exploded View of Alternator ..................................
Removal of Slip Ring End Bearing .............................
Removal of Rectifier ..........................................
Removal of Drive End Head ..................................
Removal of End Head Bearing ................
....
.. .....
Testing Rotor for Ground .....................................
Testing Rotor for Shorts .....................................
Installation of Bearing .....................................
Installation of Rectifier .......................................
Terminal Assembly ...........................................
Slip Ring End Bearing Assembly ...............................
Testing Alternator ............................................
Brush Installation ............................................
Internal Wiring Diagram ......................................
For Index to these Figures. see Table XI-I, Index - Electrical
System Schematics
Strobe Light Connections .....................................
Two Year Magnesium Battery Connections .........
.........
Five Year, Lithium Battery Connections ...
....
..................
Communications Components ELT Schematic ...................
Cabin Heater. Defroster and Fresh Air System,
PA-28-140. Serial Nos. 28-2002 to 28-24999 incl..
and PA-28-150, -160, -180, Serial Nos. 28-1 to
28-1760 incl ...............
...
..................
Cabin Heater. Defroster and Fresh Air System,
PA-28-140, Serial Nos. 28-25000 and up .....................
Cabin Heater. Defroster and Fresh Air System,
PA-28-150. -160, -180. Serial Nos. 28-1761 to
28-2477 incl ..............................................

Revised: 10 3,83

lA14

1A14

4D8
4D I
4D I
4D I
4D13
4D13
4F5
4F11
thru
4G17
4D20
4D21
4D21
4D22
4D22
4D23
4D23
4D24
4D24
4E I
4E2
4E2
4E3
4E3
4G20
thru
4H 24
4E9
413
414
4111

4117
4118
4119

PIPER CHEROKEE SERVICE MANUAL

LIST OF ILLUSTRATIONS (cont.)
Figure
13-4.
13-5.
13-6.
13-7.
13-8.
13-9.
13-10.
13-11.
14-1.
14-2.
14-3.
14-4.
14-5.
14-6.
14-7.
14-8.
14-9.
14-10.
14-11.
14-12.
14-13.
14-14.
14-15.

14-16.

Aerofiche
Grid No.
Cabin Heater. Defroster and Fresh Air System.
PA-28-150. -160. -180, Serial Nos. 28-2478 to
28-4377 incl..............................................
Cabin Heater. Defroster and Fresh Air System.
PA-28-180. Serial Nos. 28-4378 and up ......................
Cabin Heater. Defroster and Fresh Air System.
PA-28-235. Serial Nos. 28-10003 to 28-10675 incl ............
Cabin Heater. Defroster and Fresh Air System.
PA-28-235. Serial Nos. 28-10676 to 28-11039 incl ............
Cabin Heater. Defroster and Fresh Air System,
PA-28-235. Serial Nos. 28-11040 to 28-7210033 incl. ..........
Cabin Heater. Defroster and Fresh Air System.
PA-28-235. Serial Nos. 28-7310001 and up...................
Cabin Heater. Defroster and Fresh Air System.
PA-28R .................................................
Overhead Vent System.
........................................
Air Conditioning System Installation ............................
Service Valves ...............................................
Test Gauge and Manifold Set ..................................
Manifold Set Operation .......................................
Leak Test Hookup ...........................................
Evacuation Hookup ..........................................
Charging Stand ......
........................................
Charging Hookup ......................................
......
Compressor and Fabricated Oil Dipstick ..........................
Compressor and Alternator Belt Installation .....................
Magnetic Clutch .............................................
Condenser Air Scoop Installation ............................
Expansion Valve .............................................
Components Installation ......................................
Control Head - Diode Mounting Board, Diode Location and
Number. PA-28-140. Serial Nos. 28-7125472 to 28-7325057;
PA-28-180. Serial Nos. 28-7205092 to 28-7305071;
PA-28R-200. 28R-7235001 to 28R-7335057 ..................
Air Conditioning Wiring Schematic,
PA-28-140. Serial Nos. 28-7125472 thru 28-7225131 incl.:
PA-28-180, Serial Nos. 28-7205092 thru 28-7205144 incl........

Revised: 10 3 83

1A15

1A15

4120
4121
4122
4123
4124
4.11
4J2
4.13
4J7
4J 12
4J13
4J 14
4.115
4J 17
4J 19
4J21
4K I
4K5
4K7
4K11
4K13
4K15

4K16
4K18

PIPER CHEROKEE SERVICE MANUAL

LIST OF ILLUSTRATIONS

(cont.)
Aerofiche
Grid No.

Figure
14-17.

14-18.

Air Conditioning Wiring Schematic,
PA-28-140. Serial Nos. 28-7225132 to 28-7225612;
PA-28-180. Serial Nos. 28-7205145 to 28-7205328;
PA-28R-200. Serial Nos. 28R-7235001 to 28R-7235330........
Air Conditioning Wiring Schematic,
PA-28-140. Serial Nos. 28-7325001 and up:
PA-28-180. Serial Nos. 28-7305001 and up:
PA-28R-200. Serial Nos. 28-7335001 and up ..................

Revised: 10 3/83

1A16

1A16

4K19

4K20

PIPER CHEROKEE SERVICE MANUAL

LIST OF TABLES
Table
11-I.
11-11.
11-111.
II-IV.
1l-V.
II-VI.
II-VII.
II-VIII.
II-IX.
II-X.
II-XI.
111-I.
111-11.
IV-I.
IV-II.
V-l.
V-ll.
V-Ill.
VI-1.
VI-lI.
VI-III.
VII-I
VII-II.
VIIA-I.
VIIA-II.
VIIA-III.
VIII-I.
VIII-II.
VIIIA-I.
IX-1.
IX-II.
IX-III.
X-l.
X-ll.

Aerofiche
Grid No.
Leading Particulars and Principal Dimensions .................
Consumable Materials .........
.............................
Recommended Nut Torques .................................
Deleted ........................................
Conversion Tables ..........................................
Decimal Millimeter Equivalents of Drill Sizes ........................
Maximum Distance Between Supports for Fluid Tubing .........
Hose Clamp Tightening ....................................
Recommended Engine Lubricating Oils .......................
Thread Lubricants ....................................
......
Summary of Recommended Lubricants used on PA-28
Series Aircraft .........................................
Inspection Report, PA-28-140. -150. -160. -180;
PA-28-235 .....................
........................
Inspection Report. PA-28R ..................................
List of Materials (Thermoplastic Repair) ......................
Balancing Specifications .................................
....
Control Surface Travel and Cable Tension ....................
Cable Tension Vs. Ambient Temperature ......................
Troubleshooting Chart (Surface Controls) .....................
Leading Particulars. Hydraulic System ........................
Characteristics, Hydraulic Pump Motor .......................
Hydraulic System Troubleshooting ...........................
Nose Gear Alignment Tolerances .............................
Landing Gear Troubleshooting ...............................
Landing Gear Troubleshooting ...............................
PA-28R Nose Gear Service Tolerances .......................
PA-28R Main Gear Service Tolerances ........................
Propeller Torque Limits .....................................
Engine Troubleshooting Chart ...............................
Engine Troubleshooting Chart ...........................
....
Transmitter/Fuel Gauge Tolerances ..........................
Fuel Quantity Transmitter Calibration Tolerances ..............
Fuel System Troubleshooting ...............................
Vacuum System ............................................
Directional Gyro Indicator ..................................

Revised: 8 3 81

1A17
1A17

IB16
IC3
1C22
IC24
ID5
D6
ID6
IE 15
1E15
E16
1F18
IG3
117
1117
2A 11
2A13
2C19
2D8
2D13
2E9
2F9
2G20
2J 12
2J21
2J24
2K10
2L17
3CI
3C20
3C21
3D15
3D24
3F5

PIPER CHEROKEE SERVICE MANUAL

LIST OF TABLES (cont.)
Table

X-lll.
X-IV.
X-V.
X-VI.

X-VII.
X-VIII.
X-IX.
X-X.
X-XI.
X-XII.
X-XIII.
X-XIV.
X-XV.
X-XVI.
X-XVII.

XI-I.
XI-lI.
XI-lll.

XI-IV.
XI-V.
XIV-I.
XIV-II.
XIV-III.

XIV-IV.
XIV-V.

Aerofiche
Grid No.
Gyro Horizon Indicator..............
Rate of Climb Indicator..............

.......................
.......................
meter ...........................
.......................
Airspeed Tubes and Indicator.........
.......................
Magnetic Compass ..................
.......................
Manifold Pressure Indicator..........
.......................
Tachometer ........................
.......................
Engine Oil Pressure Gauge ...........
.......................
Fuel Pressure Gauge.................
.......................
Turn and Bank Indicator.............
.......................
Fuel Quantity Indicators ....................................
Oil Temperature Indicators ..................................
Troubleshooting EGT Gauge ................................
Cylinder Head Temperature Gauge ...........................
Fuel Flow Gauge .........
.................................
Electrical System Schematic Index............................
Electrical System Troubleshooting
..........................
Electrical System Component Loads ..........................
Electrical Symbols..........................................
Electrical Wire Coding .....................................
Temperature Pressure Chart .................................
Aluminum Tubing Torque...................................
Compressor Oil Change .....................................
Air Conditioning System Troubleshooting .....................
Blower System Wire Color Codes ............................

Revised: 10 383

1A18

3F7
3F8
3F10
3F 12
3F14
3F15
3F 16
3F 17
3F18
3F19
3F20
3F21
3F23
3F24
3GI
4A12
4E10
4F8
4F9
4F10
4.18
4JII
4.124
4K21
4L6

SECTION
I
INTRODUCTION
Aerofiche
Grid No.
1-1.
1-2.
1-3.
1-4.
1-5.
1-6.
1-7.
1-8.
1-9.
1-10.
1-11.
1-12.
1.-13.
1-14.
1-15.
1-16.
1-17.

General
.......
Scope of Manual
.....
Description
.......
Wing ........
Empennage
.......
Fuselage
.......
Landing Gear (Fixed)
....
Landing Gear (Retractable)
....
Hydraulic System (PA-28R) ....
Brake System
......
Engines ........
Propellers .
......
Fuel System .............
Flight Controls .............
Radio
.......
Cabin Heater, Defroster,
and Fresh Air System
Instrument and AutoPilot System ...

Reissued:1/15/81

1A19

. 1A20
..1A20
. 1A20
. 1A20
..1A20
. 1A21
1A21
.
A21
....
A21
....
. ..
1A21
1A21
1A21
....
1A21
.....
. 1A22
...
...
. 1A22
1A22
. ..
1A22
.
...
...
...
...
...
...

PIPER CHEROKEE SERVICE MANUAL
SECTIONI
INTRODUCTION
WARNING
When servicing or inspecting vendor equipment installed in Piper
aircraft,it is the user'sresponsibilityto referto the applicablevendor
publication.
1-1. GENERAL. This manual contains serviceand maintenanceinstructionsfor PA-28-140.
-150. -160. -180. -235 and PA-28R-180 200 Cherokees. designed and manufactured as
versatile airplanes in the personal and business aviation field. by the Piper Aircraft
Corporation . Vero Beach. Florida.
1-2. SCOPE OF MANUAL. Sections II and III comprise the service part of this manual,
whereas Sections IV through XIII comprise the maintenance instructions. The service
instructions include ground handling, servicing and inspections. The maintenance
instructions for each system include troubleshooting, removal and installation of
components, and corrective maintenance and testing; each major system of the airplane is
covered in a separate section. Only qualified personnel should perform the operations
described in this manual.
The description of the airplane included in this section is limited to general
information. Section II gives leading particulars and principal dimensions, while each major

system is described in its appropriate section of the manual. For a more detailed description
of the airplane, refer to the Owner's Handbook, or Pilot's Information Manual for the
particular airplane.
1-3. DESCRIPTION. The Cherokee PA-28 is a single-engine. low-wing monoplane of all
metal construction. The standard PA-28-140 is a two place. with third and fourth family seats
available as optional equipment. The PA-28-150. -160. -180. -235 and PA-28R-180 200 are
four place airplanes. Paragraphs 1-4 through 1-17 provide descriptions of the major
components and systems.
1-4. WING. The laminar flow wing is of all-metal stressed-skin, full cantilever, low-wing
design, consisting of two wing panels bolted to a spar box assembly in the fuselage. The
wing tips are removable. The ailerons are cable and push rod controlled and are dynamically
balanced. The trailing edge wing flaps are manually operated.
1-5. EMPENNAGE. The empennage consists of the fin, rudder, stabilator and stabilator
trim tabs. The stabilator is dynamically balanced.

INTRODUCTION

Revised: 1/15/86

1A20

PIPER CHEROKEE SERVICE MANUAL

1-6. FUSELAGE. The fuselage consists of three basic units: The engine section, the cabin
section, and the sheet-metal tail cone.

1-7. LANDING GEAR. (Fixed) The tricycle landinggearis of the fixed type, consistingof
shock absorbingair-oiltype oleo struts.
1-8. LANDINGGEAR.(Retractable)The tricycle landinggearis a hydraulicallyoperated,
fully retractableunit consistingof shock absorbingair-oiltype oleo struts.
1-9. HYDRAULIC SYSTEM. (PA-28R-180 200) The hydraulic system incorporates an
electrically driven pump which is controlled by a lever on the instrument panel which in turn
operates the retraction and extension of the landing gear.
1-10. BRAKE SYSTEM. The brake system operated hydraulically is controlled by a hand
lever connected to a single brake cylinder that operates both wheel brakes. On later models,
the hand lever plus individually operated brakes and cylinder control the brakes. Dual toe
brakes may be installed as optional equipment.
1-11. ENGINES. The engines installed in the PA-28 series airplanes are Avco-Lycoming
direct drive, wet sump. horizontally opposed. air cooled models. The four-cylinder engines
in the PA-28-140. -150.-160. -180 and the six-cylinder engine in the PA-28-235 are carburetor
equipped while the four-cylinder engine in the PA-28-180 200 is fuel injector equipped. The
engine model. rated horsepower and other related information for each engine may be found
in Table 11-1of Section II.
1-12. PROPELLERS. The PA-28-140. -150. -160. -180 and -235 models are equipped with
an all-metal fixed pitch propeller. A constant speed propeller may be installed as optional
equipment on the PA-28-235. and is installed as standard equipment on the PA-28R-180 200.
The constant speed propellers are controlled by a governor mounted on the engine. The
governor is in turn controlled by a lever on the power quadrant. Propeller specifications may
be found in Table 11-1of Section 11.
1-13. FUEL

SYSTEM. The fuel system on the PA-28-140. -150. -160. -180 and

PA-28R-180 200 consists of two aluminum tanks in the leading edge of the wings.
a strainer
bowl with fuel screen. one electrical auxiliary pump and one engine driven pump. The fuel
system for the PA-28-235 consists of two aluminum tanks in the wings plus an auxiliary
fiberglass tank in each wing tip. There also is a combination fuel selector and filter, electrical
auxiliary fuel pump(s) and one engine driven pump.

INTRODUCTION

Revised: 10 3 83

1A21

PIPER CHEROKEE SERVICEMANUAL

1-14. FLIGHT CONTROLS. The flight controls are conventional equipment, consistingof
a control wheel which operates the ailerons and stabilator, and pedals which operate the
rudder. Duplicate controls are provided for the copilot.
1-15. RADIO. Provisions are provided for the installations of microphone and headset
jacks, loudspeaker, and panel space for radios.
1-16. CABIN HEATER. DEFROSTER AND FRESH AIR SYSTEM. Heated air for the
cabin and defroster is obtained directly from the exhaust system muffler shroud. Fresh air
for the PA-28-140. PA-28-150.-160. -180. Serial Nos. 28-1 to 28-2477incl.. and PA-28-235.
Serial Nos. 28-10003 to 28-10675 incl.. is obtained through an intake located on the left
forward side of the fuselage. directing air to the forward section of the cockpit. Additional
intakes are located on each side of the fuselage. venting air to the individual seat location.
On the PA-28-150. -160. -180. Serial Nos. 28-2478 and up: PA-28-235. Serial Nos. 28-10676
and up. and PA-28R-180 200. fresh air is picked up from an inlet in the leading edge of each
wing. The air passed through the wings to indivually controlled outlets located just forward of
each seat. An air ent is located in the top or bottom of the fuselage to take exhaust air from
the cabin interior.

1-17. INSTRUMENTAND AUTOPILOT SYSTEM. Provisions for instrument installation
include panels for engine instruments and advanced instruments, as well as for an Autopilot
System.

Revised: 10 3 83

INTRODUCTION

1A22

1A23
INTENTIONALLY LEFT BLANK

SECTION II
HANDLING AND SERVICING
Paragraph
2-1.
2-2.
2-3.
2-4.
2-5.
2-6.
2-7.
2-8.
2-8a.
2-9.
2-10.
2-11.

2-21.
2-23.

2-30.
2-32.

Aerofiche
Grid No.
Introduction .........
........................................
Dimensions ..................................................
Station Reference Lines .......................................
Weight and Balance Data .....................................
Serial Number Plate ..........................................
Access and Inspection Provisions ...............................
Tools and Test Equipment .....................................
Torque Requirements .........................................
Torque Wrenches .............................................
Walkway. Handhold and Step .................................
Removal of Cherrylock Rivets .................................
Ground Handling ...........................................
2-12.
Introduction to Ground Handling ......................
2-13.
Jacking .............................................
2-14.
Weighing ...........................................
2-15.
Leveling ............................................
2-16.
Mooring............................................
2-17.
Locking Airplane ....................................
2-18.
Parking ............................................
2-19.
Towing .............................................
2-20.
Taxiing ..........................
................
External Power Receptacle ....................................
2-22.
Operation of External Power Receptacle ................
Cleaning ....................................................
2-24.
Cleaning Engine Compartment ........................
2-25.
Cleaning Landing Gear ...............................
2-26.
Cleaning Exterior Surfaces............................
2-27.
Cleaning Windshield and Windows ....................
2-28.
Cleaning Headliner, Side Panels and Seats..............
2-29.
Cleaning Carpets ....................................
Servicing....................................................
2-31.
Introduction to Servicing .............................
Hydraulic System (PA-28R) ...................................
2-33.
Servicing Hydraulic System ...........................
2-34.
Servicing Hydraulic Pump / Reservoir ...................

Revised: 8/3/81

A24

1A 24

1B3
1B3
1B3
1B3
1C20
1C20
1C20
IC20
1C21
C24
1D8
1D9
1D9
D9
ID10
ID10
1D11
1D12
1D12
D13
1D13
1D13
ID13
1D14
1D14
D 15
1D15
ID15
1D16
D 16
D 16
1D16
1D16
1D16
1D17

PIPER CHEROKEE SERVICE MANUAL

Paragraph
2-35.
2-37.

2-42.

2-46.

2-50.
2-52.
2-54.

Aerofiche
Grid No.
Landing Gear System ...................................
2-36.
Servicing Landing Gear ........................
Oleo Struts (PA-28-140. -150. -160. -180 and PA-28-235) ....
2-38.
Servicing Oleo Struts .............
2-39.
Filling Nose Gear Oleo Strut ......
2-40.
Filling Main Gear Oleo Strut ......
2-41.
Inflating Oleo Struts ..............
Oleo Struts (PA-28R) ......................
2-43.
Servicing Oleo Struts .............
2-44.
Filling Oleo Struts ................
2-45.
Inflating Oleo Struts ..............
Brake System .............................
2-47.
Servicing Brake System............
2-48.
Filling Brake Cylinder Reservoir....
2-49.
Draining Brake System............
Tires.....................................
2-51.
Servicing Tires ...................
Power Plant..............................
2-53.
Servicing Power Plant.............
Induction Air Filter .
...................
2-55.
Removal of Air Filter .............
2-56.
Service Instruction (Cleaning and Ins pection)............
2-57.
Installation of Air Filter ..........
.............

2-58.
2-58.
2-60.

2-68.
2-70.
2-71.

Propeller.
Propeller ....................................................

2-59.
Servicing Propeller.................................
Fuel System ................................................
2-61.
Servicing Fuel System ................................
2-62.
Filling Fuel Tanks (PA-28-140. -150, -180 and
PA-28R) .......................................
2-63.
Filling Fuel Tanks (PA-28-235) ........................
2-64.
Draining Moisture From Fuel System (PA-28-140, -150,
-160. -180 and PA-28R)
......................
2-65.
Draining Moisture From Fuel System (PA-28-235) ....
2-66.
Draining Fuel System ................................
2-67.
Anti-Icing Fuel Additive .............................
Electrical System .............................................
2-69.
Ser icing Electrical System ............................
Lubrication ..................................................
Oil System (Engine) ..........................................
2-72.
Servicing Oil System .................................
2-73.
Filling Oil Sump ....................................

Reissued: 1/15/81

1B1

1D17
1D17
1D17
1D17
ID18
1 D24
1E1
IE2
IE2
IE3
IE4
IE4
1E4
1E4
IE5
IE5
IE5
IE5
IE5
IE5
IE5
1E6
1E7
1E7
1E7
IE7
IE7
IE8
IE8
1E8
IE8
IE10
IE10
IEIO
IE1O
1E11
1E11
1E11
IEII

PIPER CHEROKEE SERVICE MANUAL
Aerofiche
Grid No.
2-74.
2-75.
2-76.
2-77.
2-78.
2-79.
2-80.
2-81.
2-82.
2-83.

Reissued:1/15/81

Draining Oil Sump ..........
...
.
(Suction.) ..
Oil Screens.
.......
(Pressure.)
Oil Screen.
.......
(Full Flow.)
Oil Filter.
for Changing Oil
Recommendations
......
Lubrication Instructions .
Application of Oil ..........
........
Application of Grease
.........
Winterization Plate
.
....
.
Lubrication Chart .

IB2

IE12
1E12

.

1E12
IE12
E13
1E13
IE13
IE14
1E14

.

1E14

PIPER CHEROKEE SERVICE MANUAL

SECTION II
HANDLING AND SERVICING
2-1. INTRODUCTION. This section contains routine handling and servicing
procedures that are most frequently encountered. Frequent reference to this
section will aid the individual by providing information such as the location of
various components, ground handling procedures, routine service procedures
and lubrication. When any system or component requires service other than the
routine procedures as outlined in this section, refer to the appropriate section
for that component.

2-2. DIMENSIONS. The principal airplane dimensions are shown in Figures 2-1 through
2-12 and are listed in Table II-I.

2-3. STATION REFERENCE LINES. In order to facilitate the location of various components of theairplanewhichrequiremaintenance
and servicing, a method
utilizing fuselage station (Sta.), wing station or buttock line (BL), and water line
(WL) designations is frequently employed in this manual. (Refer to Figures 2-13
thru 2-24.) Fuselage stations, buttock lines, and water lines are reference points
measured by inches in the vertical or horizontal direction from a given reference
line which indicates station locations of structural members of the airplane. Station 0 of the fuselage is 78.4 inches aheadof thewing leading edge or 49.5 inches
ahead of the lower edge of the firewall; station 0 (BL) of the wing and stabilator
is the centerline of the airplane; and station 0 (WL) of the fuselage vertical stabilizer and rudder is 20.5 inches below the cabin floor as measured at the rear
wing spar with the airplane level. The reference datum line is located 78.4 inches
ahead of the wing leading edge at the intersection of the straight and tapered section.
2-4. WEIGHT AND BALANCEDATA. Whenfiguringvarious weight and balance
computations, the empty, static and gross weight, and center of gravity of the
airplane may be found in the Weight and Balance Form of the Airplane Flight
Manual.

HANDLING AND SERVICING

Reissued: 1/15/81

1B3

PIPER CHEROKEE SERVICE MANUAL

I

C329

63.75"
-

Figure 2-1. Three-Viewof Cherokee
PA-28-140and PA-28-150-160-180,Serial Nos. 28-1 to 28-1760 incl.
PA-28-140Flite Liner, Serial Nos. 28-7125174 and up
HANDLING AND SERVICING

Reissued: 1/15/81

1B4

PIPER CHEROKEE SERVICE MANUAL

862

*1974 MODELS

AND UP

30'

Figure 2-2. Three-View of Cherokee 140
PA-28-140, SerialNos. 28-7225001 and up

Reissued: 1/15/81

HANDLING AND SERVICING

1B5

PIPER CHEROKEE SERVICE MANUAL

1694

Reissued: 1/15/81

HANDLINGAND SERVICING

1B6

PIPER CHEROKEE SERVICE MANUAL

1836

Figure 2-4. Three-Viewof Cherokee
PA-28-180,Serial Nos. 28-4378 to 28-7105244 incl.
HANDLING AND SERVICING
Reissued:1/15/81

1B7

PIPER CHEROKEE SERVICE MANUAL

1732

Figure 2-5. Three-View of Cherokee PA-28-180,
SerialNos. 28-7205001 to 28-7205328 incl.

HANDLINGAND SERVICING
Reissued: 1/15/81

1B8

PIPER CHEROKEE SERVICE MANUAL

1724

1974 MODELS AND UP

Figure 2-6. Three-View of Cherokee PA-28-180,
Serial Nos. 28-7305001 and up

Reissued: 1/15/81

HANDLING AND SERVICING

PIPER CHEROKEESERVICEMANUAL

1691

63.0"

1840

23' 8.55"

Figure 2-7. Three-View of Cherokee
PA-28-235, Serial Nos. 28-10000 to 28-11039 incl.

HANDLINGAND SERVICING

Reissued: 1/15/81

1BlO

PIPER CHEROKEE SERVICE MANUAL

182B

I

Figure 2-8. Three-View of Cherokee
PA-28-235,Serial Nos. 28-11040 to 28-7110042 incl.
HANDLING AND SERVICING

Reissued:1/15/81

1Bll

PIPER CHEROKEE SERVICE MANUAL

C330

Figure 2-9. Three-View of Cherokee PA-28-235,
SerialNos. 28-7210001 to 28-7210033 incl.
HANDLING AND SERVICING

Reissued: 1/15/81

1B12

PIPER CHEROKEE SERVICE MANUAL

886

*1974 MODELS

AND UP

Figure 2-10. Three-View of Cherokee PA-28-235,
Serial Nos. 28-7310001 and up

HANDLING AND SERVICING

Reissued: 1/15/81

1B13

PIPER CHEROKEE SERVICE MANUAL

1796

30'

Figure 2-11. Three-View of Cherokee
PA-28R-180,Serial Nos. 28-30005 to
PA-28R-200,SerialNos. 28-30482 to 28-7130019 incl.
28-7135238 incl.
Reissued: 1/15/81

HANDLINGAND SERVICING

1B14

PIPER CHEROKEESERVICEMANUAL

1796

*1974

MODELS

AND Up

5' 3.0"

32' 2.32"

7° DIHEDRAL

11.83"

74.00" <1
72.50"

Figure 2-12. Three-View of Cherokee
PA-28R-200, SerialNos. 28-7235001 and up

HANDLING AND SERVICING

Reissued: 1/15/81

1B15

PIPER CHEROKEE SERVICE MANUAL

TABLE II-I. LEADING PARTICULARS

AND PRINCIPAL

MODEL

DIMENSIONS

PA-28-140

ENGINE
Manufacturer
Model

Avco-Lycoming
O-320-E2A or O-320-E3D

FAA Type Certificate
Rated Horsepower
Rated Speed:
Full Throttle
Oil, SAE Number
Oil Sump Capacity
Fuel, Aviation Grade (Minimum Octane)
Fuel, Aviation Grade (Specified Octane)
Fuel, Aviation Grade (Alternate)
Fuel Injector, Bendix
Magnetos, Scintilla:
Left
Right
Magneto Timing
Magneto Point Clearance
Spark Plugs (Shielded):
Refer to the latest revision of Lycoming
Service Instruction No. 1042.
Firing Order

274
140 or 150
2450 RPM - 2700 RPM
See Table II-IX
8 U.S. quarts
80/87
80/87
See Note 37
Scintilla
or Slick
S4LN-21
or 4051
S4LN-204 or 4050
25° BTC
0.018 + 0.006

1-3-2-4

Starter:
Delco-Remy, 12 Volt
Prestolite, 12 Volt
Alternator, Chrysler (35 AMP) 20
Voltage Regulator, Chrysler
Alternator, Chrysler (60 AMP) 30
Voltage Regulator, WICO
Overvoltage Relay, WICO
Alternator, Prestolite (60 AMP)
Voltage Regulator, WICO
Fuel Pump Drive

1109657
MZ4204
2098615 or 2642996
2098613 or 87-87102-21 32
2642997 or 2642210
X16300B
X16799B
ALY-6422 31
X16300B
Plunger

PROPELLER
Fixed Pitch:
Manufacturer
Model

Sensenich
M74DM

Refer to Grid IC2 for foot Notes:

HANDLING AND SERVICING

Revised: 10 3 83

1B16

PIPER CHEROKEE SERVICE MANUAL

TABLE II-I. LEADING PARTICULARS

AND PRINCIPAL DIMENSIONS (cont)
PA-28-140

MODEL
PROPELLER (cont.)

Diameter
Diameter, Minimum
Blade Pitch in Inches at the 75% Radius Station 9

74.0 in.
72.5 in.
58 thru 62 in. 21
56 thru 58 in. 22

FUEL SYSTEM
Inboard (Main Fuel Tanks
Capacity) (each)
Unusable Fuel (each)
Total Capacity
Total Unusable Fuel
Refer to Owner's Handbook, Pilot's
Information Manual or Flight Manual
for particular airplane.

Two
25 U.S. gal.
0.125 U.S. gal.
50 U.S. gal.

LANDING GEAR
Fixed
Combination Air-Oil

Type
Shock Strut Type
Fluid Required (Struts, Hydraulic System
and Brakes)
Strut Exposure (Exposure under static load):
Nose
Main
Wheel Tread
Wheel Base
Nose Wheel Travel

MIL-H-5606
3.25 + .25 in.
4.50 ± .25 in.
10.0 ft.
6 ft. 2.65 in. 17 or 6 ft. 1.92 in.
REFER TO SECTION VII
TABLE VII-I
Cleveland 38501, 6:00 x 6
Cleveland 40-28, 6:00 x 6 14
Cleveland 40-86, 6:00 x 6 15
Cleveland 30-18 14
Cleveland 30-55 15
6:00 x 6, 4 ply rating
6:00 x 6, 4 ply rating
24 psi
24 psi

Wheel, Nose
Wheel, Main
Brake Type
Tires, Nose
Tires, Main
Tire Pressure, Nose
Tire Pressure, Main
ALL MODELS, CONTROL SURFACES
AND CABLE TENSIONS

14

REFER TO SECTION V
TABLE V-I

Refer to Grid 1C2 for foot Notes:
HANDLING AND SERVICING

Revised: 10 3 83

lB17

PIPER CHEROKEE SERVICE MANUAL
TABLE II-I. LEADING PARTICULARS
MODEL

AND PRINCIPAL

DIMENSIONS (cont)

PA-28-150

PA-28-160

Manufacturer
Model

Avco-Lycoming
O-320-A2B or O-320-E2A

Avco-Lycoming
O-320-B2B or O-320-D2A

FAA Type Certificate
Rated Horsepower
Full Throttle
Oil, SAE Number
Oil Sump Capacity
Fuel, Aviation Grade (Minimum Octane)
Fuel, Aviation Grade (Specified Octane)
Fuel, Aviation Grade (Alternate)
Fuel Injector, Bendix
Magnetos, Scintilla:
Left
Right
Magneto Timing
Magneto Point Clearance
Spark Plugs (Shielded):
Refer to the latest revision of Lycoming
Service Instruction No. 1042.
Firing Order

274
150
2700 RPM
See Table II-IX
8 U.S. quarts
80/87
80/87
See Note 37

274
160
2700 RPM
See Table II-IX
8 U.S. quarts
90/96
90/96

S4LN-21
S4LN-204
25° BTC
0.018 ± 0.006 in.

S4LN-21
S4LN-20
25° BTC
0.018 +.006 in.

1-3-2-4

1-3-2-4

1109657
MZ4204
1101900
1118704
2098615 or 2642996
2098613 or 87-87102-21
2642997 or 2642210
X16300B
X16799B 5
Plunger

1109657 or
MZ4206
1101900
1118704
2098615 or
2098613 or
2642997 or

ENGINE

Starter:
Delco-Remy, 12 Volt
Prestolite, 12 Volt
Generator, Delco-Remy (35 AMP)
Voltage Regulator, Delco-Remy
Alternator, Chrysler (35 AMP) 20
Voltage Regulator, Chrysler
Alternator, Chrysler (60 AMP) 30
Voltage Regulator, WICO
Overvoltage Relay, WICO
Fuel Pump Drive

32

1109511

2642996
87-87102-21 32
2642210

X16300B
X16799B5
Plunger

PROPELLER
Fixed Pitch:
Manufacturer
Model

I

Sensenich
M74DM 7 or M74DMS 8

Sensenich
M74DM 7 or M74DMS 8

Refer to Grid 1C2 for foot Notes:
HANDLINGANDSERVICING

Revised: 10 3 83

lB18

PIPER CHEROKEE SERVICE MANUAL

TABLE II-I. LEADING PARTICULARS AND PRINCIPAL DIMENSIONS (cont)
MODEL

PA-28-150

PA-28-160

74.0 in.
72.5 in.
58 in.

74.0 in.
72.5 in.

Two

25 U.S. gal.
0.125 U.S. gal.
50 U.S. gal.

Two
25 U.S. gal.
0.125 U.S. gal.
50 U.S. gal.

Fixed
Combination Air-Oil

Fixed
Combination Air-Oil

MIL-H-5606

MIL-H-5606

3.25 ±.25 in.

3.25 + .25 in.

PROPELLER (cont.)
Diameter
Diameter, Minimum
Blade Angle 9

60 in. - 47 in.

27

FUEL SYSTEM
Inboard (Main Fuel Tanks
Capacity) (each)
Unusable Fuel (each)
Total Capacity
Total Unusable Fuel
Refer to Owner's Handbook, Pilot's
Information Manual or Flight Manual
for particular airplane.
LANDING GEAR
Type
Shock Strut Type
Fluid Required (Struts, Hydraulic System
and Brakes)
Strut Exposure (Exposure under static
load):
Nose
Main
Wheel Tread
Wheel Base
Nose Wheel Travel
Wheel, Nose
Wheel, Main
Brake Type
Tires, Nose
Tires, Main
Tire Pressure, Nose
Tire Pressure, Main
ALL MODELS, CONTROL SURFACES
AND CABLE TENSIONS

4.50 + .25 in.
4.50 + .25 in.
10.0 ft.
10.0ft.
6 ft. 2.65 in.
6 ft. 2.65 in.
REFER TO SECTION VII REFER TO SECTION VII
TABLE VII-I
TABLE VII-I
Cleveland 38501, 6:00 x 6
Cleveland 38501, 6:00 x 6
Cleveland 40-28, 6:00 x 6 7 Cleveland40-28, 6:00 x 6 7
Cleveland 40-86, 6:00 x 6 8 Cleveland 40-86, 6:00 x 6 8
Cleveland 30-18 7
Cleveland 30-18 7
Cleveland 30-55 8
Cleveland 30-55 8
6:00 x 6, 4 ply rating
6:00 x 6, 4 ply rating
6:00 x 6, 4 ply rating
6:00 x 6, 4 ply rating
24 psi
24 psi
24 psi
24 psi

REFER TO SECTION V
TABLE V-I

Refer to Grid 1C2for foot Notes:
Revised: 10 3 83

REFER TO SECTION V
TABLE V-I
HANDLINGAND SERVICING

lB19

PIPER CHEROKEE SERVICE MANUAL
TABLE II-I. LEADING PARTICULARS AND PRINCIPAL DIMENSIONS (cont)
MODEL

PA-28-180

38

PA-28-235

39

ENGINE
Manufacturer
Model

Avco-Lycoming
O-360-A3A or O-360-A4A

Avco-Lycoming
O-540-B2B5,0-540-B1B5

FAA Type Certificate
Rated Horsepower
Rated Speed:
Full Throttle
Oil, SAE Number
Oil Sump Capacity
Fuel, Aviation Grade (Minimum Octane)
Fuel, Aviation Grade (Specified Octane)
Fuel, Aviation Grade (Alternate)
Fuel Injector, Bendix
Magnetos, Scintilla:
Left
Right
Magneto Timing
Magneto Point Clearance
Spark Plugs (Shielded):
Refer to the latest revision of Lycoming
Service Instruction No. 1042.
Firing Order

286

or O-540-B4B5
295
235

180
180 @ 2700 RPM
See Table II-IX
8 U.S. quarts
90/96
90/96

235 @ 2575 RPM

S4LN-21
S4LN-20 35 or S4LN-204 36
25° BTC
0.018 + 0.006 in.

S6LN-21

1-3-2-4

1-4-5-2-3-6

See Table II-IX
12 U.S. quarts
80/87
80/87
See Note 37

S6LN-20 2 or S6LN-204 3
25° BTC

0.018 ± 0.006 in.

Starter:

I

Delco-Remy, 12 Volt
Prestolite, 12 Volt
Alternator, Chrysler (35 AMP) 20
Voltage Regulator, Chrysler
Alternator, Chrysler (60 AMP) 30
Voltage Regulator, WICO
Overvoltage Relay, WICO
Alternator, Prestolite (60 AMP)

1109657or
MZ4206
2098615or
2098613or
2642997or
X16300B

Voltage Regulator, WICO
Fuel Pump Drive

X16300B
Plunger

1109511
2642996
87-87102-2132
2642210

X16799B 5
ALY-6422 31

1109657or 1109511
MZ4206
2098615or 2642996
2098613or 87-87102-2132
2642997or 2642210
X16300B
X16799B 6

Plunger

Refer to Grid IC2 for foot Notes:

Revised: 10 3 83

HANDLINGANDSERVICING

1B20

PIPER CHEROKEE SERVICE MANUAL

TABLE II-I. LEADING PARTICULARS AND PRINCIPAL DIMENSIONS (cont)
MODEL

PA-28-180

PA-28-235

ENGINE (cont)
PROPELLER
Fixed Pitch:
Manufacturer
Model
Diameter
Diameter, Minimum
Blade Angle 9

Sensenich
McCauley or Sensenich
M76EMM 7 or M76EMMS 8 IP235PFA80 M80BMM
76.0 in.
76.0 in.
57 thru 60 in. - 48 in.

Constant Speed:
Manufacturer
Hub, Model
Blade, Model
Diameter, Minimum
Blade Angle, Low Pitch 9
Blade Angle, High Pitch 9
Governor Control
Governor Model

I

28

80.0 in.
80.0 in.
78.5 in.
78.5 in.
66 thru 71 in. 69 thru 71 in.
Hartzell
HC-C2YK-1BF
F8468A-4
80.0 in.
13.5° + 2 °
27° + 2°
Hartzell
F-4-3

Refer to Grid 1C2 for foot Notes:

Revised: 10 3 83

HANDLING ANDSERVICING

1B21

PIPER CHEROKEE SERVICE MANUAL

TABLE II-I. LEADING PARTICULARS
MODEL

AND PRINCIPAL

PA-28-180

DIMENSIONS (cont)

PA-28-235

FUEL SYSTEM

Inboard (Main Fuel Tanks
Capacity) (each)
Unusable Fuel (each)
Outboard (Tip) Fuel Tanks
Capacity (each)
Unusable Fuel (each)
Total Capacity
Total Unusable Fuel
Refer to Owner's Handbook, Pilot's
Information Manual or Flight Manual
for particular airplane.

Two
Two
25 U.S. gal.
25 U.S. gal.
0.125 16 or 0.82 U.S. gal. 15 0.125 16 or 0.82 U.S. gal. 15
Two

17 U.S. gal.
0.125

16

or 0.11 U.S. gal.

50 U.S. gal.

84 U.S. gal.

Type

Fixed

Fixed

Shock Strut Type

Combination Air-Oil

Combination Air-Oil

MIL-H-5606

MIL-H-5606

15

LANDING GEAR

Fluid Required (Struts, Hydraulic System
and Brakes)
Strut Exposure (Exposure under static
load):
Nose
Main
Wheel Tread
Wheel Base
Nose Wheel Travel
Wheel, Nose

3.25 + .25 in.
4.50 .25 in.
10.0 ft.
6 ft. 2.65 in. 17 or 6 ft. 6.9 in.
REFER TO SECTION VII
TABLE VII-I
Cleveland 38501, 6:00 x 6

Wheel, Main

Cleveland 40-28, 6:00 x 6 7

Cleveland 40-58, 6:00 x 6 18

Cleveland 40-86, 6:00 x 6 8
Cleveland 30-18 '
Cleveland 30-55 8
6:00 x 6, 4 ply rating
6:00 x 6, 4 ply rating

Cleveland 40-86, 6:00 x 6 19

Brake Type
Tires, Nose
Tires, Main
Tire Pressure, Nose
Tire Pressure, Main
ALL MODELS, CONTROL SURFACES
AND CABLE TENSIONS

I

3.25 ±..25 in.
4.50 ± .25 in.
10.0 ft.
147 ft. 2.68 in. 17or 6 ft. 6.06 in. 14
REFER TO SECTION VII
TABLE VII-I

Cleveland 38501, 6:00 x 6

24 psi

Cleveland 30-34 18
Cleveland 30-55 9
6:00 x 6, 4 ply rating
6:00 x 6, 6 ply rating
28-30 psi
35-40 psi

REFER TO SECTION V
TABLE V-I

REFER TO SECTION V
TABLE V-I

Refer to Grid IC2 for foot Notes:
Revised: 10 3 83

HANDLING AND SERVICING

1B22

PIPER CHEROKEE SERVICE MANUAL

TABLE II-I. LEADING PARTICULARS AND PRINCIPAL DIMENSIONS (cont)
MODEL

PA-28R- 180

PA-28R-200

Avco-Lycoming

Avco-Lycoming

ENGINE
Manufacturer
Model

FAA Type Certificate
Rated Horsepower
Rated Speed:
Full Throttle
Oil, SAE Number
Oil Sump Capacity
Fuel, Aviation Grade (Minimum Octane)
Fuel, Aviation Grade (Specified Octane)
Fuel, Aviation Grade (Alternate)
Fuel Injector, Bendix
Magnetos, Scintilla:
Left
Right
Magneto Timing
Magneto Point Clearance
Spark Plugs (Shielded):
Refer to the latest revision of Lycoming
Service Instruction No. 1042.
Firing Order
Starter:
Prestolite, 12 Volt
Generator, Delco-Remy (35 AMP)
Voltage Regulator, Delco-Remy
Alternator, Chrysler (35 AMP) 20
Voltage Regulator, Chrysler
Alternator, Chrysler (60 AMP) 30
Voltage Regulator, WICO
Overvoltage Relay, WICO
Alternator, Prestolite (60 AMP)
Voltage Regulator, WICO
Fuel Pump Drive

IO-360-B 1E

IO-360-C1Cor IO-360-C1C64

1E10
180

1E10
200

180 @ 2700 RPM
See Table II-IX
8 U.S. quarts
100/130
100/130

200 @ 2700 RPM
See Table II-IX
8 U.S. quarts
100/130
100/130

RSA-5AD1

RSA-5ADI

S4LN- 1227
S4LN- 1209
25 ° BTC
0.016 in.

S4LN-1227
S4LN-1209

1-3-2-4

1-3-2-4

MZ4206

MZ4206 or MZ4218

2642997or 2642210
X16300B
X16799B

2642997
X16300B
X16799B

20° BTC 41

0.016 in.

ALY-6422

Type JT

40

31

X16300B
Type JT

Refer to Grid 1C2 for foot Notes:

HANDLINGANDSERVICING

Revised: 103 83

1B23

PIPER CHEROKEE SERVICE MANUAL

TABLE II-I. LEADING PARTICULARS
MODEL

AND PRINCIPAL

DIMENSIONS (cont)

PA-28R-180

PA-28R-200

Hartzell
HC-C2YK-IBF
F7666A-0
76.0 in.
74.0
14.30
30°
Hartzell
F-2-2
F-2-7

or
Hartzell
HC-C2YK-1B
F7666A-2
74.0
72.5
14° ± 0.2°
29° + 2°
Hartzell
F-2-7

PROPELLER

I

Constant Speed:
Manufacturer
Hub, Model
Blade, Model
Diameter
Diameter, Minimum
Blade Angle, Low Pitch 9
Blade Angle, High Pitch 9
Governor Control
Governor Model

McCauley 40
B2D34C213
90DHA-16
74.0
73.0
13.0° + 0.2°
29.8 ° + 0.5°
Hartzell
F-2-7 ( )

Refer to Grid 1C2 for foot Notes:

HANDLINGANDSERVICING

Revised: 4 23 84

1B24

PIPER CHEROKEE SERVICE MANUAL
TABLE II-I. LEADING PARTICULARS AND PRINCIPAL DIMENSIONS (cont)
MODEL

PA-28R-180

PA-28R-200

Two

Two

25 U.S. gal.
0.125 U.S. gal.
50 U.S. gal.

25 U.S. gal.
0.82 U.S. gal.
50 U.S. gal.

Hydraulically Retractable
Combination Air-Oil

Hydraulically Retractable
Combination Air-Oil

MIL-H-5606

MIL-H-5606

2.75 ± .25 in.
2.0 ± .25 in.

2.75 + .25 in.
2.0 .25 in.

FUEL SYSTEM
Inboard (Main Fuel Tanks
Capacity) (each)
Unusable Fuel (each)
Total Capacity
Total Unusable Fuel
Refer to Owner's Handbook, Pilot's
Information Manual or Flight Manual
for particular airplane.
LANDING GEAR
Type
Shock Strut Type
Fluid Required (Struts, Hydraulic System
and Brakes)
Strut Exposure (Exposure under static
load):
Nose
Main
Wheel Tread
Wheel Base
Nose Wheel Travel
Wheel, Nose
Wheel, Main
Brake Type
Tires, Nose
Tires, Main
Tire Pressure, Nose
Tire Pressure, Main
ALL MODELS, CONTROL SURFACES
AND CABLE TENSIONS

I

10 ft. 5.72 in.
7 ft. 5.382 in.
REFER TO SECTION VII
TABLE VII-I
Cleveland 40-77, 5:00 x 5
Cleveland 40-84, 6:00 x 6
Cleveland 30-41
5:00 x 5, 4 ply rating
6:00 x 6, 4 ply rating
30 psi

10 ft. 5.72 in.
7 ft. 5.4 in. 17or 7 ft. 10.6 in. 14

REFER TO SECTION VII
TABLE VII-I
Cleveland 40-77, 5:00 x 5
Cleveland 40-84, 6:00 x 6
Cleveland 30-41
5:00 x 5, 4 ply rating

6:00 x 6, 4 ply rating
30 psi

27 psi

27 psi

REFER TO SECTION V
TABLE V-I

REFER TO SECTION V
TABLE V-I

Refer to Grid 1C2 for foot Notes:

HANDLINGAND SERVICING

Revised: 10 3 83

1C1

PIPER CHEROKEE SERVICE MANUAL

TABLE II-II. CONSUMABLE MATERIALS

Material

Specification or Brand Name

Manufacturer

Rain Repellant

REPCON
FSCM 50159

UNELKO Corporation
727 E. 110th Street
Chicago Illinois 60628

Teflon Tape

.003 x .50 wide -1

Minesota Mining & Manufacturing Co.
3M Center
St. Paul, Minesota 55101

Teflon Tape

.003 x .50 wide -l

Shamban W.S. & Company
713 Mitchell Road
Newbury Park, California 91320

Teflon Tape

.003 x .25 wide -2

Johnson & Johnson Inc.
Permacel Division
501 George Street
New Brunswick. N.J. 08903

Adhesive.
Door Snubber

3MEC 1300. C
Scotch Grip 2210

3-M Co.
Adhesive Coatings and Sealers Div.
3-M Center
St. Paul, Minnesota 55101

PROCO Adhesive 6205-1

Reissued: 1/15/81

Protective Coatings, Inc.
807 N. Fremont Ave.
Tampa. Fla.

HANDLING AND SERVICING

1C3

PIPER CHEROKEE SERVICE MANUAL

1689

Figure 2-13. Station Reference Lines,
PA-28-140and PA-28-150-160-180,Serial Nos. 28-1 to 28-1760 incl.
PA-28-140Flite Liner, Serial Nos. 28-7125174 and up
Reissued: 1/15/81

HANDLING AND SERVICING

1C4

PIPER CHEROKEE SERVICE MANUAL

1761

*1974 MODELS

AND UP

Figure 2-14. Station Reference Lines,
PA-28-140, SerialNos. 28-7225001 and up

Reissued: 1/15/81

HANDLING AND SERVICING

1C5

PIPER CHEROKEE SERVICE MANUAL

1798

Figure 2-15. Station Reference Lines,
PA-28-150-160-180,Serial Nos. 28-1761 to 28-4377 incl.

HANDLINGAND SERVICING

Reissued: 1/15/81

1C6

PIPER CHEROKEE SERVICE MANUAL

C331

0

Figure 2-16. Station Reference Lines,
PA-28-180, SerialNos. 28-4378 to 28-7105244 incl.

HANDLING AND SERVICING

Reissued:1/15/81

1C7

PIPER CHEROKEE SERVICE MANUAL

1710

Figure 2-17. Station Reference Lines,
PA-28-180, SerialNos. 28-7205001 to 28-7205328 incl.
Reissued: 1/15/81

HANDLINGAND SERVICING

1C8

PIPER CHEROKEE SERVICE MANUAL

1754

Figure 2-19. Station Reference Lines,
PA-28-235,Serial Nos. 28-10000 to 28-11039 incl.

Reissued: 1/15/81

HANDLINGAND SERVICING

1C10

PIPER CHEROKEE SERVICE MANUAL

1906

Figure 2-20. Station Reference Lines,
PA-28-235,Serial Nos. 28-11040 to 28-7110042 incl.

Reissued: 1/15/81

HANDLING AND SERVICING

1C11

PIPER CHEROKEE SERVICE MANUAL

1908

Figure 2-21. Station Reference Lines,
PA-28-235,Serial Nos. 28-7210001 to 28-7210033 incl.
Reissued: 1/15/81

HANDLINGAND SERVICING

1C12

PIPER CHEROKEE SERVICE MANUAL

1731

Figure 2-23. Station Reference Lines,
PA-28R-180, SerialNos. 28-30005 to 28-7130019 incl.
PA-28R-200,SerialNos. 28-30482 to 28-7135238 incl.
Reissued: 1/15/81

HANDLINGAND SERVICING

1C14

PIPER CHEROKEE SERVICE MANUAL

1760

Figure 2-24. Station Reference Lines,
PA-28R-200,SerialNos. 28-7235001 and up
Reissued: 1/15/81

HANDLING AND SERVICING

1C15

PIPER CHEROKEE SERVICE MANUAL

1. TIP, STABILATOR
2. TIP, RUDDER
3. FAIRING, FIN
4. TAIL CONE, CONTROL CABLE,
AND TRIM SCREW
5. TIP, WING
6. COVER, BELLCRANK AND
CONTROL CABLES
7. FAIRING, MAIN GEAR STRUT
ASSEMBLY
8. FAIRING, FLAP TORQUE TUBE
AND AILERON CABLES
9. CAP, FUEL TANK ASSEMBLY
10. CAP, STRUT FILLER
11. FAIRING, FUEL LINES
12. COVER, FUEL LINES AND
SPAR ATTACHMENT BOLTS
13. SPINNER, PROPELLER
14. COWL ASSEMBLY, ENGINE
15. COWL ASSEMBLY, ENGINE
PA-28- 140 SERIAL NO'S
& UP
26-7225001

1794

16.
17.

2

18.

19.

20.
21.
22.

PANEL, TORQUE TUBE AND
CONTROL CABLES & BATTERY
PLATE, CONTROL CABLES
MIDDLE
PLATE, AILERON AND
STABILATOR CONTROL
CABLE FORWARD
COVERS, AILERON AND
STABILATOR CONTROL
CABLE
PANEL, AFT AREA OF
FUSELAGE
PLATE, CONTROL CABLES
AND PULLEYS REAR
COVER, FLAP CONTROL

Figure 2-25. Access Plates and Panels
PA-28-140and Flite Liner
Nos. 28-7225001 and up as noted
Serial
PA-28-140,
HANDLINGAND SERVICING

Reissued:1/15/81

1C16

PIPER CHEROKEE SERVICE MANUAL

C332

UPPER SURFACE

1

LOWERSURFACE

5

4

f
131.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.

TIP, STABILATOR
TIP, RUDDER
FAIRING, FIN
TAIL CONE, CONTROL CABLE AND TRIM SCREW
TIP, WING
15
COVER, BELLCRANK AND CONTROL CABLES
FAIRING, MAIN GEAR STRUT ASSEMBLY
FAIRING, FLAP TORQUE TUBE AND AILERON CABLES
CAP, FUEL TANK ASSEMBLY
CAP, STRUT FILLER
FAIRING, FUEL LINES
COVER, FUEL LINES AND SPAR ATTACHMENT BOLTS
DOOR, OIL FILLER
COWL ASSEMBLY, ENGINE
SPINNER, PROPELLER
SEAT, TOROUE TUBE AND CONTROL CABLES
PLATE, CONTROL CABLES MIDDLE
PLATE, AILERON AND STABILATOR CONTROL CABLE FORWARD
COVERS, AILERON AND STABILATOR CONTROL CABLE
PANEL, BATTERY AND AFT AREA OF FUSELAGE
PLATE, CONTROL CABLES AND PULLEYS REAR
COVER, FLAP CONTROL

16

21

17
18

Figure2-26. Access Plates and Panels
PA-28-150-160-180

Reissued: 1/15/81

HANDLING AND SERVICING

1C17

PIPER CHEROKEE SERVICE MANUAL

UPPERSURFACE

1

2

1

LOWER SURFACE
1793

4

6

6

14

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.

TIP, STABILATOR
16
TIP, RUDDER
FAIRING, FIN
TAIL CONE, CONTROL CABLES AND TRIM SCREW
COVER, TANK ATTACHMENT FITTINGS
COVER, BELLCRANK AND CONTROL CABLES
FAIRING, MAIN GEAR STRUT ASSEMBLY
FAIRING, FLAP TORQUE TUBE AND AILERON CABLES
FUEL SELECTOR AND DRAIN VALVE ASSEMBLY
ELECTRIC FUEL PUMP ASSEMBLY
COVER, FUEL LINES AND SPAR ATTACHMENT BOLTS
FAIRING, FUEL LINES
CAP, STRUT FILLER
CAP, FUEL TANK ASSEMBLY
FUEL TANK ASSEMBLY, WING TIP
DOOR, OIL FILLER
SPINNER, PROPELLER
COWL ASSEMBLY, ENGINE
SEAT, TORQUE TUBE AND CONTROL CABLES
PLATE, CONTROL CABLES AND PULLEYS REAR
COVER, FLAP AND TRIM CONTROL
COVERS, AILERON AND STABILATOR CONTROL CABLE
PANEL, BATTERY & AFT AREA OF FUSELAGE
PLATE, CONTROL CABLES MIDDLE
PLATE, AILERON AND STABILATOR CONTROL CABLE FORWARD

17

Figure 2-27. Access Plates and Panels
PA-28-235

Reissued:1/15/81

HANDLING AND SERVICING

1C18

PIPER CHEROKEE SERVICE MANUAL

UPPERSURFACE
LOWERSURFACE
1752

4
3-

5

6

7

8

8

7

6

5

10

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.

TIP, STABILATOR
TIP, RUDDER
FAIRING, FIN
TAIL CONE, CONTROL CABLES & TRIM SCREW
15
TIP, WING
COVER, BELLCRANK & CONTROL CABLES
CAP, FUEL TANK ASSEMBLY
COVER, GEAR ATTACHMENT FITTING
FAIRING, FLAP TORQUE TUBE AND AILERON CABLES
DOOR, MAIN GEAR
FAIRING, FUEL LINES
COVER, FUEL LINES AND SPAR ATTACHMENT BOLTS
DOOR, OIL FILLER
COWL ASSEMBLY, ENGINE
SPINNER, PROPELLER
PLATE, AILERON AND STABILATOR CONTROL CABLE FORWARD
PLATE, CONTROL CABLES MIDDLE
SEAT, TORQUE TUBE AND CONTROL CABLES
COVER, FLAP AND TRIM CONTROL
PLATE, CONTROL CABLES AND PULLEYS REAR
COVERS, AILERON AND STABILATOR CONTROL CABLE
PANEL, HYDRAULIC PUMP, BATTERY & AFT AREA OF FUSELAGE

Figure 2-28. Access Plates and Panels
PA-28R

HANDLING AND SERVICING

Reissued: 1/15/81

1C19

PIPER CHEROKEE SERVICE MANUAL

2-5. SERIAL NUMBER PLATE. The serial number plate is located on the left side of the
fuselage near the leading edge of the stabilator. The serial number should always be used
when referring to the airplane on service or warranty matters.
2-6. ACCESS AND INSPECTION PROVISIONS. The access and inspection provisions
for the airplane are shown in Figures 2-25 thru 2-28. The component to be serviced or inspected through each openingis identified in the illustration. All access plates and panels are
secured by either metal fasteners or screws.
CAUTION
Before entering the aft section of the fuselage, be sure the
airplane is supported at the tail skid.
To enter the aft section of the fuselage,open the baggage compartment door and remove
the access panel.
2-7. TOOLS AND TEST EQUIPMENT. Because of the simplicity and easy accessibility
of components, few special tools outside normal shop tools will be required. Tools that are
required are listed in the back of the PA-28 Parts Catalog and may be fabricated to dimensions
given in the back of the section that pertains to a particular component.
2-8. TORQUE REQUIREMENTS. The torque values given in Table II-III are derived
from oil-free, cadmium-plated threads and, unless otherwise noted, are recommended for all
air-frame installation procedures where torquing is required. Engine torque valuesare given
in the latest revision of Avco-LycomingService BulletinNo. 268, and propeller torque values
are given in Section VIII or VIIIA.

Reissued: 1/15/81

HANDLINGAND SERVICING

IC20

PIPER CHEROKEE SERVICE MANUAL

2-8a. TORQUE WRENCHES.
Torque wrenches should be checked daily and calibrated by means of weights and a measured lever arm to
make sure that inaccuracies are not present. Checking one torque wrench against another is not sufficient and
is not recommended. Some wrenches are quite sensitive as to the way they are supported during a tightening
operation. Any instructions furnished by the manufacturer must be followed explicitly.
When it is necessary to use a special extension or adapter wrench together with a torque wrench, a simple
mathematical equation must be worked out to arrive at the correct torque reading. Following is the formula to
be used: (Refer to Figure 2-30.)
T = Torque desired at the part.
A = Basic lever length from center of wrench shank to center of handle or stamped on wrench or listed for
that model wrench.
B = Length of adapter extension, center of bolt to center of shank.
C = Scale reading needed to obtain desired torque (T).

The formula: C= A xT

A +B
A+B

EXAMPLE
A bolt requires 30 foot-pounds and a 3 inch adapter (one-quarter of
a foot or .25) is needed to get at it. You want to know what scale
reading it will take on a one-foot lever arm wrench to obtain the 30
foot-pounds at.the bolt.
30
= 24 ft. -lbs.
.1.25
Remember, the 3 inch adapter must be projecting 3 inches straight
along the wrench axis. In general, avoid all complex assemblages or
adapters and extensions of flex joints.
C =

30 or C
I + .25

A933

A

T

Figure 2-30. Torque Wrench Formula

Revised: 8/3/81

1C21

HANDLING AND SERVICING

PIPER CHEROKEE SERVICE MANUAL
TABLE II-III

RECOMMENDED NUT TORQUES (Inch-Pounds)

TORQUES:The importanceof correct applicationcan not be
wearof nuts
canresultin unnecessary
overemphasized.
Undertorque
and bolts as well as the parts they are holdingtogether.When
are applied,unevenloadswill be transmitted
insufficientpressures
wear or
throughoutthe assemblywhich may result in excessive
premature
failuredueto fatigue.Overtorque
canbe equallydamaging
thethreaded
areas.
because
of failureof a boltor nut from overstressing
that shouldbe
Therearea fewsimple,but veryimportant,procedures
thatthe correcttorqueisapplied:
followedto assure
1. Calibratethe torquewrenchperiodicallyto assureaccuracy;
andrecheck
frequently.
2. Ascertainthat the bolt and nut threadsare cleanand dry
by themanufacturer).
otherwise
specified
(unless
3. Run nut downto nearcontactwith the washeror bearing
surfaceandcheck"friction dragtorque"requiredto turnthe
nut.
4. Add the friction drag torque to the desiredtorque
recommended
by the manufacturer,
or obtaindesiredtorque
as shownin Chart9103. Thisis referredto as final torque
which shouldregisteron the indicatoror the settingfor a
typewrench.
snapover

BOLTS
Steel Tension
AN 3 thru AN 20
AN 42 thru AN 49
AN 73thru AN 81
AN 173 thru AN 186
MS 20033 thru MS 20046
MS 20073
MS 20074
AN 509 NK9
MS 24694
AN 525 NK525
MS 27039
NUTS
Steel Tension
AN 310
AN 315
AN 363
AN 365
NAS 1021
MS 17825
MS 21045
MS 20365
MS 20500
NAS 679

NOTE
For more detailson torquing, refer to FAA Manual
AC 43.13-1.

Steel Shear
AN 320
AN 364
NAS 1022
MS 17826
MS 20364

COARSE THREAD SERIES

Nut-bolt
size

FRICTIONDRAG TORQUES
COARSEAND FINE

o

BOLT SIZE

FRICTIONDRAG TORQUE (IN.-LBS.)

10

18

1/4

30

5/16

60

3/8

80

7/16

100

8
10

.

Revised: 10/3/83

1C22

-32
-24
1/4-20
5/16-18
3/8-16
7/16-14
1/2-13
9/16-12
5/8-11
3/4-10
7/8- 9
1
-8
1./8-8
1-1/4-8

Torque Limits
in-lbs

Torque Limits
in-lbs

Min.

Max.

Min.

Max

12
20
40
80
160
235
400
500
700
1.150
2,200
3.700
5.500
6.500

15
25
50
90
185
255
480
700
900
1.600
3.000
5.000
6.500
8.000

7
12
25
48
95
140
240
300
420
700
1.300
2.200
3.300
4,000

9
15
30
55
110
155
290
420
540
950
1,800
3.000
4.000
5.000

HANDLING AND SERVICING

PIPER CHEROKEE SERVICE MANUAL

TABLE II-111. RECOMMENDED NUT TORQUES (Inch-Pounds) (cont.)
FINE THREAD SERIES

MS 20004 thru MS 20024
NAS 144 thru NAS 158
NAS 333 thru NAS 340
NAS 583 thru NAS 590
NAS 624 thru NAS 644
NAS 1303 thru NAS 1320
NAS 172
NAS 174
NAS 517
Steel shearbolt

AN 3 thru AN 20
AN 42 thru AN 49
AN 73 thru AN 81
AN 173 thru AN 186
MS 20033 thru MS 20046
MS 20073
MS 20074
AN 509 NK9
MS 24694
AN 525 NK525
MS 27039

AN 310
AN 315
AN 363
AN 365
NAS 1021
MS 17825
MS 21045
MS 20365
MS 20600
NAS 679
Nut-bolt
size

10

-36
-32
1/4-28
5/16-24
3/8-24
7/16-20
1/2-20
9/16-18
5/8-18
3/4-16
7/8-14
-14
1
1-1/8-12
1-1/4-12

Torque Limits
in-lbs

Min.

Max.

12
20
50
100
160
450
480
800
1.100
2.300
2,500
3,700
5,000
9,000

15
25
70
140
190
500
690
1.000
1.300
2,500
3,000
4,500
7,000
11.000

AN 3DD thru AN 20DD
AN 173DD thru AN 186DD
AN 509DD
AN 525D
MS 27039D
MS 2469400

NAS 464
NUTS

NUTS

NUTS
Steel Tension

BOLTS
Aluminum

BOLTS
Steel Tension

BOLTS
Steel Tension

Steel Sheer
AN 320
AN 364
NAS 1022
MS 17826
MS 20364

Torque Limits
in-lbs

Min.

7
12
30
60
95
270
290
480
660
1.300
1.500
2,200
3,000
5,400

Max.

9
15
40
85
110
300
410
600
780
1,500
1.800
3.300
4,200
6,600

Steel Tension
AN 310
AN 315
AN 363
AN 365
MS 17825
MS 20365
MS 21045
NAS 1021
NAS 679
NAS 1291
Torque Limits
in-lbs

Steel Shear

Alum. Tension

AN 320
AN 364
NAS 1022
MS 17826
MS 20364

AN 365D
AN 310D
NAS 1021d

Torque Limits
in-lbs

Torque Limits
in-lbs

Min.

Max.

Min.

Max.

Min.

25
80
120
200
520
770
1,100
1,250
2,650
3,550
4,500
6,000
11.000

30
100
145
250
630
950
1,300
1,550
3,200
4,350
5,500
7,300
13,400

15
50
70
120
300
450
650
750
1,600
2,100
2,700
3,600
6,600

20
60
90
150
400
550
800
950
1,900
2,690
3,300
4,400
8,000

5
10
30
40
75
180
280
380
550
950
1,250
1,600
2,100
3,900

Max.

10
15
45
65
110
280
410
580
670
1,250
1,900
2,400
3,200
5,600

Alum. Shear
AN 320D
AN 364D
NAS 1022d

Torque Limits
in-lbs

Min.

3
5
15
25
45
110
160
230
270
560
750
,950
1.250
2,300

Max.

6
10
30
40
70
170
260
360
420
880
1,200
1,500
2,000
3,650

HANDLING AND SERVICING

Revised: 10/3/83

1C23

PIPER CHEROKEESERVICEMANUAL

2-9. WALKWAY, HANDHOLD AND STEP. The walkwayis made of a non-skidcompound appliedto paperand bondedto the wing surface.A fixed handholdis locatedon the
rightside of the fuselagenearthe rearwindow.A step is availableas optionalequipmentand
is installedjust aft of the trailingedge of the right flap.
TABLE II-V. CONVERSION TABLES
1. These charts contain the various conversion data that may be useful when figuring capacities. lengths.

temperatures. and various weights and measures from the English systemvaluesto the metricsystem
values or back again.
2. The English system is in use by England and the United States. All other countries use the metric
system.

3. Procedurefor ConvertingInches to Millimeters.(Refer to Table II-V.)
A.

Example: Convert 1.5 inches to millimeters.
(1)
(2)
(3)

Read down inches column to 1. inches.
Read across top inch column to 0.5.
Read down and across to find millimeters (1.5 inches is 38.10 millimeters).

4. Procedure for Converting Fahrenheit (°F) and Celsius (°C) (Centigrade) Temperature. (Refe:

Table II-V.)
A.

Read number in middle column. if in degrees Celsius (°C). read Fahrenheit equivalent in
right-hand column. If in degrees Fahrenheit (°F). read Celsius equivalent in left-hand column.
(1) 70F = 21.1°C.
(2) 30°C = 86.0°F.

Reissued: 1/15/81

1C24

HANDLING AND SERVICING

PIPER CHEROKEE SERVICE MANUAL

TABLE II-V. CONVERSION TABLES (cont)
MULTIPLY

BY

TO OBTAIN

MULTIPLY

BY

TO OBTAIN

CENTIMETERS

0.3937
0.03281

IN.
FT.

KILOGRAMS

CU. CENTIMETERS

0.001
0.06102
0.0002642

LITERS
CU. IN.
U.S. GAL.

2.205
35.27
1000

LB.
OZ.
GRAMS

LITERS

CU. FT.

28.320
1.728
7.481
28.32

CU. CM.
CU. IN.
U.S. GAL.
LITERS

1000
61.03
0.03532
0.2642
0.22
1.057

CU. CM.
CU. IN.
CU. FT.
U.S. GAL
IMPERIAL GAL.
QUARTS

CU. IN.

16.39
0.01639
0.004329
0.01732

CU. CM.
LITERS
U.S. GAL.
QUARTS

METERS

39.37
3.281
1000

IN.
FT.
MM.

METER-KILOGRAM

CU. METERS

1000000
35.314
61.023
264.17
999.97

CU. CM.
CU. FT.
CU. IN.
GAL.
LITERS

7.233
9.807

FT.-LB
JOULES

OUNCES. AVDP

0.0625
28.35
437.5

LB.. AVDP
GRAMS
GRAINS

OUNCES. FLUID

0.3048
12.000
304.8
0.3333

METERS
MILS.
MM.
YARDS

29.57
1.805

CU. CM
CU. IN

LB.. AVDP

453.6
7000
16.0

0.1383
0.001285
0.000000376

GRAMS
GRAINS
OUNCES

M-KG
BTU
KW-HR

SQUARE INCH

6.4516

SQ. CM.

8
29.6

DRAM
CU. CM.

POUND PER
SQUARE INCH
(PSI)

0.0703

FLUID OZ.

KG-CM
SQUARED

GAL.. IMPERIAL

277.4
1.201
4.546

CU. IN.
U.S. GAL.
LITERS

STATUTE MILE

1.609
0.8684

KILOMETER
NAUTICAL MILE

NAUTICAL MILE

1.151

GAL.. U.S. DRY

268.8
0.1556
1.164
4.405

CU. IN.
CU. FT.
U.S. GAL.. LIQ.
LITERS

STATUTE
MILE

QUART

231.0
0.1337
3.785
0.8327
128

CU. IN.
CU. FT.
LITERS
IMPERIAL GAL.
FLUID OZ.

IN.

2.540
.08333

CM.
FT.

JOULES

0.000948
0.7376

BTU
FT.-LB.

FEET

FT.-LB.

GAL.. U.S. LIQ.

Reissued:1/15/81

.9463

LITER

MILLIMETER

1000

MICRON

MICRON

0.001
0.000039

MILLIMETER
INCH

INCH
POUNDS

11.521

METER
GRAMS

INCH
OUNCES

0.72

METER
GRAMS

POUNDS

0.453

KILOGRAMS

HANDLING AND SERVICING

1D1

PIPER CHEROKEE SERVICE MANUAL

TABLE II-V. CONVERSION TABLES (cont)

C328

INCHES TO MILLIMETER
INCHES

0.0000

0.0001

0.0002

0.000
0.001
0.002
0.003
0.004
0.005
0.006
0.007
0.008
0.009

0.0254
0.0508
0.0762
0.1016
0.1270
0.1524
0.1778
0.2032
0.2286

0.0025
0.0279
0.0533
0.0787
0.1041
0.1295
0.1549
0.1803
0.2057
0.2311

0.0050
0.0304
0.0558
0.0812
0.1066
0.1320
0.1574
0.1828
0.2082
0.2336

INCHES

0.000

0.001

0.002

0.00
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09

0.254
0.508
0.762
1.016
1.270
1.524
1.778
2.032
2.286

0.025
0.279
0.533
0.787
1.041
1.295
1.549
1.803
2.057
2.311

0.050
0.304
0.558
0.812
1.066
1.320
1.574
1.828
2.082
2.336

INCHES

0.00

0.01

0.02

0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9

2.540
5.080
7.620
10.160
12.700
15.240
17.780
20.320
22.860

0.254
2.794
5.334
7.874
10.414
12.954
15.494
18.034
20.574
23.114

0.508
3.048
5.588
8.128
10.668
13.208
15.748
18.288
20.828
23.368

0.1

0.2

2.54
27.94
53.34
78.74
104.14
129.54
154.94
180.34
205.74
231.14

5.08
30.48
55.88
81.28
106.68
132.08
157.48
182.88
208.28
233.68

I

INCHES

0.00

I
0.

I.
2.
3.
4.
5.
6.
7.
8.
9.

25.40
50.80
76.20
101.60
127.00
152.40
177.80
203.20
228.60

0.0003

0.0004
MILLIMETER
0.0076
0.0101
0.0330
0.0355
0.0584
0.0609
0.0838
0.0863
0.1092
0.1117
0.1346
0.1371
0.1600
0.1625
0.1854
0.1879
0.2108
0.2133
0.2362
0.2387

0.0005

0.0006

0.0007

0.0008

0.0009

0.0127
0.0381
0.0635
0.0889
0.1143
0.1397
0.1651
0.1905
0.2159
0.2413

0.0152
0.0406
0.0660
0.0914
0.1168
0.1422
0.1676
0.1930
0.2184
0.2438

0.0177
0.0431
0.0685
0.0939
0.1193
0.1447
0.1701
0.1955
0.2209
0.2463

0.0203
0.0457
0.0711
0.0965
0.1219
0.1473
0.1727
0.1981
0.2235
0.2489

0.0228
0.0482
0.0736
0.0990
0.1244
0.1498
0.1752
0.2006
0.2260
0.2514

0.003

0.005

0.006

0.007

0.008

0.009

0.152
0.406
0.660
0.914
1.168
1.422
1.676
1.930
2.184
2.438
0.06

0.177
0.431
0.685
0.939
1.193
1.447
1.701
1.955
2.209
2.463
0.07

0.203
0.457
0.711
0.965
1.219
1.473
1.727
1.981
2.235
2.489
0.08

0.228
0.482
0.736
0.990
1.244
1.498
1.752
2.006
2.260
2.514

0.03

0.127
0.381
0.635
0.889
1.143
1.397
1.651
1.905
2.159
2.413
0.05
1.270
3.810
6.350
8.890
11.430
13.970
16.510
19.050
21.590
24.130

1.524
4.064
6.604
9.144
11.684
14.224
16.764
19.304
21.844
24.384

1.778
4.318
6.858
9.398
11.938
14.478
17.018
19.558
22.098
24.638

2.032
4.572
7.112
9.652
12.192
14.732
17.272
19.812
22.352
24.892

2.286
4.826
7.366
9.906
12.446
14.986
17.526
20.066
22.606
25.146

0.5

0.6

0.7

0.8

09

12.70
38.10
63.50
88.90
114.30
139.70
165.10
190.50
215.90
241.30

15.24
40.64
66.04
91.44
116.84
142.24
167.64
193.04
218.44
243.84

17.78
43.18
68.58
93.98
119.38
144.78
170.18
195.58
220.98
246.38

20.32
45.72
71.12
96.52
121.92
147.32
172.72
198.12
223.52
248.92

22.86
48.26
73.66
99.06
12446
149.86
175.26
200 66
226.06
251.46

0.004
MILLIMETER
0.076
0.101
0.330
0.355
0.584
0.609
0.838
0.863
1.092
1.117
1.346
1.371
1.600
1.625
1.854
1.879
2.108
2.133
2.362
2.387
0.04
MILLIMETER
0.762
0.016
3.302
3.556
5.842
6.096
8.382
8.636
10.922
11.176
13.462
13.716
16.002
16.256
18.542
18.796
21.082
21.336
23.622
23.876
0.3

0.4
MILLIMETER
7.62
10.16
33.02
35.56
58.42
60.96
83.82
86.36
109.22
111.76
134.62
137.16
160.02
162.56
185.42
187.96
210.82
213.36
236.22
238.76

Reissued: 1/15/81

0.09

HANDLING AND SERVICING

1D2

1D3
INTENTIONALLY LEFT BLANK

PIPER CHEROKEE SERVICE MANUAL

TABLE II-V. CONVERSION TABLES (cont)
CENTIGRADE-FAHRENHEIT

CONVERSION TABLE

Example: To convert 20°C. to Fahrenheit, find 20 in the center
column headed (F-C); then read 68.0°F. in the column (F) to the
right. To convert 20° F. to Centigrade; find 20 in the center column
and read -6.67°C. in the (C) column to the left.
C
-56.7
-51.1
-45.6
-40.0
-34.0
-38.9
-23.3
-17.8
-12.22
-6.67
-1.11
4.44
10.00
15.56
21.11
26.67
32.22
27.78
43.33
38.89
54.44
60.00
65.56
71.00
76.67
82.22
87.78
93.33
98.89

F-C
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210

F

C

-94.0
-76.0
-58.0
-40.0
-22.0
-4.0
14.0
32.0
50.0
68.0
86.0
104.0
122.0
140.0
158.0
176.0
194.0
212.0
230.0
248.0
266.0
284.0
302.0
320.0
338.0
356.0
374.0
392.0
410.0

104.44
110.00
115.56
121.11
126.67
132.22
137.78
143.33
148.89
154.44
160.00
165.56
171.11
176.67
182.22
187.78
193.33
198.89
204.44
210.00
215.56
221.11
226.67
232.22
257.78
243.33
248.89
254.44
260.00

F-C

F

220
230
240
250
260
270
280
290
300
310
320
330
340
350
360
370
380
390
400
410
420
430
440
450
460
470
480
490
500

428.0
446.0
464.0
482.0
500.0
518.0
536.0
554.0
572.0
590.0
608.0
626.0
644.0
662.0
680.0
698.0
716.0
734.0
752.0
770.0
788.0
806.0
824.0
842.0
860.0
878.0
896.0
914.0
932.0

I

HANDLING AND SERVICING

Reissued: 1/15/81

1D4

VI.

DECIMAL

MILLIMETER

N

o o o
0000
0000
Equivalents

0

LL
z
N

E

S

of

Drill

Sizes

1/2"
From

to

No.

80

o

PIPER CHEROKEE SERVICE MANUAL

TABLE II-VII.

MAXIMUM DISTANCE BETWEENSUPPORTS FOR FLUID TUBING

TUBEOD

DISTANCEBETWEENSUPPORTS(IN.)

(IN.)

ALUMINUM
ALLOY

1/8

STEEL

9-1/2

11-1/2

3/16

12

14

1/4

13-1/2

]6

5/16

15

18

3/8

16-1/2

20

1/2

19

23

5/8

22

25-1/2

3/4

24

27-1/2

1

26-1/2

30

TABLE II-VIII.

HOSE CLAMP TIGHTENING. (INITIAL INSTALLATION)
Types of clamps

Types of hose
Worm screw type

All other types

Self sealing

Finger-tight-plus
2 complete turns

Finger-tight-plus
2 1/2 complete turns

All other hose

Finger-tight-plus
1/4 complete Turns

Finger-tight-plus
2 complete turns

If clamps do not seal at specified tightening. examine hose connection and replace parts as
necessa ry.

Reissued:1/15/81

HANDLING AND SERVICING

1D6

PIPER CHEROKEE SERVICE MANUAL

8362

TWO COTTON BRAIDS - IMPREGNATED
WITH SYNTHETIC COMPOUND

SINGLE WIRE BRAID SYNTHETICINNER TU BE

YELLOW

A.

YELLOW NUMERALS.
LETTERSAND STRIPE

D.

NON-SELF-SEALING
AROMATIC RESISTANTHOSE

FLAME AND AROMATIC RESISTANTHOSE
WHITE NUMEERALS, LETTERSAND STRIPE

RED

(VIEW SHOWS OPPOSITESIDES OF HOSE)

B.

NON-SELF-SEALING AROMATIC AND HEAT-RESISTANTHOSE
RED NUMERALS LETTERSAND STRIPE

E.

RED NUMERALS AND LETTERS

SELF-SEALING AROMATIC
RESISTANTHOSE

FLAME, AROMATIC AND OIL RESISTANTHOSE

C.

MARKINGS
HOSEIDENTIFICATION
ORANGE

BROWN

ELECTRICAL
CONDUIT
GREEN

BREATHING
OXGYEN

ORANGE

COMPRESSED
GAS
RED

FUEL

ORANGE

GRAY

GRAY

INSTRUMENT
AIR
ORANGE

BLUE

PNEUMATIC

YELLOW

LUBRICATION

AIR
CONDITION

RED

FLUID LINE IDENTIFICATION USING TAPE AND DECALS

Reissued:1/15/81

Figure 2-29. Identification of Aircraft Fluid Lines
HANDLING AND SERVICING

1D7

PIPER CHEROKEE SERVICE MANUAL

8362

DRIFT PIN

4.

SMALL
CENTERDRILL

6.

3.

Figure 2-31. Removal of Cherrylock Rivets
2-10. REMOVALOF CHERRYLOCKRIVETS.
To remove cherrylock rivet:
1. File head flat.
2. Centerpunch rivet head.
3. In thick material, remove the lock by driving out the rivet stem using. a tapered steel drift pin. (See
View 1.)
- NOTE Do not drill completely through the rivet sleeve to remove a rivet, as
this will tend to enlarge the hole.
4. In thin material, use a small center drill to provide a guide for a larger drill on top of the rivet stem.
and the tapered position of the stem be drilled away to destroy the lock.
5. Remove the remainder of the locking collar out of the rivet head by prying it loose with the drift pin.
(See View 3.)
6. Drill nearly through the head of the rivet. using a drill the same site as the rivet shank. (See View4.)
7. Pry off the rivet head using the drift pin. (See View 5.)
8. Drive out the remaining shank with a pin having the same diameter as the rivet shank. (See View6.)

Reissued: 1/15/81

1D8

HANDLING AND SERVICING

PIPER CHEROKEE SERVICE MANUAL

949

947

Figure 2-32. Jacking Arrangement
2-11. GROUNDHANDLING.
2-12. INTRODUCTION TO GROUND HANDLING. This includes jacking, weighing,
leveling,mooring, parking, towing and taxiing. Handling the airplane in the manner described
in the following paragraphs will minimize damage to the airplane and its equipment.
CAUTION
When moving airplane forward by hand avoid pushing on the
trailing edge of the ailerons for this will result in an out of
trim condition.
2-13. JACKING. Jacking the airplane is necessary to service the landing gear and to
perform other service operations. Proceed as follows:
a. Placejacks under jack pads on the front wing spar. (Refer to Figure 2-32.)
b. Attach the tail support to the tail skid. Place approximately 250 pounds of ballast
on the base of the tail support to hold down the tail.
CAUTION
Be sure to apply sufficient tail support ballast; otherwise the
airplane will tip forward.

Reissued: 1/15/81

1D9

HANDLING AND SERVICING

PIPER CHEROKEE SERVICE MANUAL

948

947

Figure 2-33. Weighing Airplane
NOTE
A jacking point on the PA-28R airplanes is also provided on the underside of the fuselage directly behind
the nose gear actuating cylinder. This may be used
along with the wing jack points to raise the airplane,
or alone it may be used to raise the front end.
c. Raise the jacks until all three wheels are clear of the surface.

2-14. WEIGHING. (Refer to Figure 2-33.) For weighing purposes, place the airplane on
scales as follows:
a. Position a scale and ramp in front of each of the three wheels.
b. Secure the scales from rolling forward and tow the airplane up onto the
scales. (Refer to Paragraph 2-19.)
c. Remove the ramp so as not to interfere with the scales.
d. If the airplane is to be weighed for weight and balance computations, level
the airplane per instructions given in paragraph 2-15.
2-15. LEVELING. All configurationsof the airplane are provided with ameans
for longitudinal and lateral leveling. The airplane maybe leveled while on jacks,
during theweighing procedure while the wheels are on scales, orwhile thewheels
are on the ground. To level the airplane for purposes of weighing or rigging, the

HANDLING AND SERVICING

Reissued:
1/15/81
Reissued:1/15/81

1Dl0

PIPER CHEROKEE SERVICE MANUAL

902
902

896
896

Figure 2-34. Leveling Longitudinally

Figure 2-35. Leveling Laterally

followingprocedures may be used:
a. To longitudinally level the airplane, partially withdraw the two leveling screws
located immediately below the left front side window. (Refer to Figure 2-34.) Place a level
on these screws heads and adjust the jacks until the level is centered. Should the airplane be
either on scales or on the floor, first block the main gear oleos to full extension; then deflate
the nose wheel until the proper position is reached.
b. To laterally level the airplane, place a level across the spar box assemblylocated at
the forward baggage area of the PA-28-140 or under the rear seat of the PA-28-150,-160,
-180; PA-28-235; PA-28R. (Refer to Figure 2-35.)Raise or lower one wing tip by deflating
the appropriate tire on the high side of the airplane or adjust eitherjack until the bubble of the
level is centered.
2-16. MOORING. The airplane is moored to insure its immovability, protection and
security under various weather conditions. In order to properly moor the airplane use the
followingprocedures:
a. Head the airplaneinto the wind, if possible.
b. Block the wheels.
c. Secure the aileron and stabilator controls using the front seat belt or control surface
blocks.
d. Secure tie-down ropes to the wing tie-down rings and the tail skid at approximately
45 degree angles to the ground. When using rope constructed of non-synthetic material,
leave sufficient slack to avoid damage to the airplane when the ropes contract due to
moisture.

Reissued: 1/15/81

HANDLING AND SERVICING

1Dl1

PIPER CHEROKEE SERVICE MANUAL

CAUTION
Use square or bowline knots. Do not use slip knots.
NOTE
Additional preparations for high windsinclude usingtie-down
ropes on the landing gear forks, and securing the rudder.
e. Install pitot tube cover, if available.
2-17. LOCKING AIRPLANE. The cabin and baggage compartment doors are provided
with an outside lock. The ignition switch and cabin door require the same key while the
baggage compartment door has a different key.
2-18. PARKING. When parking the airplane, insure that it is sufficientlyprotected against
adverse weather conditions and presents no danger to other aircraft. When parking the airplane for any length of time or overnight, it is recommended that it be moored as in
Paragraph 2-16.
a. Park the airplane headed into the wind, if possible.
b. PA-28-150, -160, Serial Nos. 28-1 to 28-250 incl. Set the parking brake by pulling
back the brake lever and pulling the parking brake knob located at the left of the control
panel. Release the brake lever while holding the knob, then release the knob. To release the
parking brake, either push in the parking brake knob or pull back the brake lever.
c. PA-28-140; PA-28-150, -160, -180, Serial Nos. 28-251 and up; PA-28-235 and
PA-28R. Set the parking brake by pulling back the brake lever and depressing the knob
attached to the left side of the handle, then release the handle. To release the parking brake,
pull back on the brake leverto disengagethe catch mechanism,and allow the handle to swing
forward.
NOTE
Care should be taken when setting brakes that are overheated
during cold weather when accumulated moisture may freeze
the brakes.

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PIPER CHEROKEE SERVICE MANUAL

d. The aileron and stabilator controls may be secured using the front seat belt.
2-19. TOWING. The airplane may be moved by using the nose wheel steering bar that is
stowed in the baggage area of the PA-28-150,-160,-180; PA-28-235and PA-28R, or by using
power equipment that will not damage or cause excess strain to the nose gear steering
assembly. Towing lugs are incorporated as part of the nose gear fork of modelsPA-28-140;
PA-28-150,-160, -180;PA-28-235and PA-28R. On the PA-28R, the stem on the bar is inserted
in the hollow of the nose wheel axle at its right side.
CAUTIONS
1. When towing with power equipment, do not turn the
nose gear in either direction beyond its steering radius
limits as this will result in damage to the nose gear and
steering mechanism.
2. Do not tow the airplane with control locks installed.
3. When moving the airplane forward by hand, avoid
pushing on the trailing edge of the control surfaces as this
will cause the control surface contour to change resulting
in an out-of-trim condition.
In the event towing lines are necessary, lines (rope) should be attached to both main
gear struts as high up on the tubes as possible. Linesshould be long enough to clear the nose
and/or tail by not less than 15 feet, and a qualified person to ride in the pilot's seat to
maintain control by use of the brakes.
2-20. TAXIING. Before attempting to taxi the airplane, ground personnel should be
checked out by a qualified pilot or other responsibleperson. Engine starting and shutdown
procedures should be covered as well. When it is ascertained that the propeller back blast
and taxi areas are clear, apply power to start the taxi roll and perform the followingchecks:
a. Taxi forward a few feet and apply brakes to determine their effectiveness.
b. Taxi with propeller set in low pitch, high RPM setting, where applicable.
c. While taxiing, make slight turns to ascertain the effectivenessof steering.
d. Observe wing clearances when taxiing near buildings or other stationary objects. If
possible, station a guide outside the airplane to observe.
e. When taxiing on uneven ground, avoid holes and ruts.
f. Do not operate the engine at high RPM when running-up, or taxiing, over ground
containing loose stones, gravel or any loose material that may cause damage to the propeller
blades.
2-21. EXTERNAL POWER RECEPTACLE.
2-22. OPERATION OF EXTERNAL POWER RECEPTACLE. The receptacle is located
on the left side of the nose section,just aft of the enginecowling.Whenused for enginestarting
or operation of the airplanes' other equipment, proceed as follows:

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PIPER CHEROKEE SERVICE MANUAL

a. Set MASTER SWITCH to OFF.
b. Ensure that the RED lead of PEP (Piper External Power) kit jumper cable is connected to the POSITIVE (+) terminal of an external 12-voltbattery or a power cart and that
the BLACK lead is connected to the NEGATIVE (-) terminal of same.
NOTE
If using an external battery, and the airplanes' battery is low
or depleted, disconnect the airplane battery at the negative
terminal to prevent excessiveloading of the external battery.
c. Insert the plug of the jumper cable into the receptacle.
d. Set MASTER SWITCH to ON and proceed with NORMAL engine starting.
e. After starting engine, set the MASTER SWITCH to OFF and remove the jumper
cable plug from the receptacle.
f. Set the MASTER SWITCH to ON and checkthe alternator ammeter for an indication
of output.
WARNING
Do not attempt any flight without an indication of alternator
output.
2-23. CLEANING.
2-24. CLEANINGENGINE COMPARTMENT.Before cleaning the engine compartment,
place a strip of tape on the magneto vents to prevent any solvent from entering these units.
a. Place a pan under the engine to catch waste.
b. With the enginecowlingremoved, spray or brush the engine with solvent or a mixture
of solvent and degreaser, as desired. Brushing may be necessarywhere heavy grease and dirt
deposits have collected.
CAUTION
Do not spray solvent into the alternator, starter, air intake,
and alternate air inlets.
c. Allow the solvent to remain on the engine from five to ten minutes; then rinse the
engine clean with additional solvent and allow to dry.
CAUTION
Do not operate engine until excess solvent has evaporated or
otherwise been removed.
d. Removethe protective covers from the magnetos.
e. Lubricate controls, bearingsurfaces, etc., per Lubrication Chart.

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2-25. CLEANING LANDING GEAR. Before cleaning the landing gear, place a plastic
cover or similar material over the wheel and brake assembly.
a. Place a pan under the gear to catch waste.
b. Spray or brush the gear area with solvent or a mixture of solvent and degreaser, as
desired. Brushing may be necessary where heavy grease and dirt deposits have collected.
c. Allow the solvent to remain on the gear from five to ten minutes, then rinse the gear
with additional solvent and allow to dry.
d. Remove the cover from the wheel and remove the catch pan.
e. Lubricate the gear per Lubrication Chart.

2-26. CLEANING EXTERIOR SURFACES. The airplane should be washed with
a mild soap and water. Harsh abrasives or detergents used on painted or plastic
surfaces couldmake scratches or cause corrosionof metal surfaces. Cover areas
where cleaning solution could cause damage. Cover the mast of the PA-28R-180
gear back-up extender. To wash the airplane, the following procedure may be
used:
a. Flush away loose dirt with water.
b. Apply cleaning solution with a rag, sponge or soft bristle brush.
c. To remove stubborn oil and grease, use a cloth dampened with naptha.
d. Where exhaust stains exist, allow solution to remain on the surface longer.
e. Any good automotive wax may be used to preserve the painted surfaces.
Soft cleaning cloths or a chamois should be used to prevent scratches when cleaning or polishing. A heavier coating of wax on the leading surfaces will reduce
the abrasion problems in these areas.
2-27.
a.
b.
a soft
faces.
c.

CLEANING WINDSHIELD AND WINDOWS.
Remove dirt, mud, etc. from exterior surfaces with clean water.
Wash with mild soap and warm water or an aircraft plastic cleaner using
cloth or sponge and a straight rubbing motion. Do not harshly rub surRemove oil and grease with a cloth moistened with kerosene.
NOTE
Do not use gasoline, alcohol, benzene, carbon tetrachloride, thinner, acetone or window cleaning sprays.

d. After cleaning plastic surfaces, apply a thin coat of hard polishing wax.
Rub lightly with a soft cloth. Do not use a circular motion.

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e. A severescratch or mar in plastic can be removed by usingjeweler's rouge to rub out the
scratch. Smooth both sides and apply wax.
f. To improve visibilitythrough windshieldand windowsduring flight through rain, a rain
repellant such as REPCON should be applied to the windshieldand windows. The surfaces of
the windshieldand windowstreated become so smooth that water beads up and readily flows
off the surface. Apply this product in accordance with the manufacturer's instructions. (Refer
to Table II-II Consumable Materials, for specifications and Manufacturer's address.)

2-28. CLEANINGHEADLINER,SIDEPANELSAND SEATS.
a. Clean headliner, side panels and seats with a stiff bristle brush and vacuum where
necessary.
b. Soiled upholstery, except leather, may be cleaned by using an approved air type
cleaner or foam upholstery cleaner. Carefully follow the manufacturer's instructions. Avoid
soaking or harsh rubbing.
CAUTION
Solvent cleanersrequire adequate ventilation.
c.

Leather material should be cleaned with saddle soap or mild soap and water.

2-29. CLEANING CARPETS. Use a small whisk broom or vacuum to remove dirt. For
soiledspots, use a non-inflammabledry-cleaningfluid.
2-30. SERVICING.
2-31. INTRODUCTION TO SERVICING. This includes replenishment of fuel, oil, and
hydraulic fluids; the maintenance of tire pressures; and the lubrication of various items.
2-32. HYDRAULICSYSTEM(PA-28R)
2-33. SERVICING HYDRAULIC SYSTEM. The general condition of the hydraulic pump
and landing gear actuating cylinders should be checked. Ensure that there are no leaks and
that the line fittings are tight. The cylinder rods are to be free of all dirt and grit. To clean the
rods use an oil soaked rag and carefully wipe them. All the hydraulic lines should also be
checked for freedom of leaks, kinks, and corrosion. Check for tightness of the attachment
fittings.

The gear back up extender actuator assemblyis located beneath the rear seat and should
be checked to determine that it is operating properly. The diaphragm shaft may be operated
by hand to make sure that it is free to fluctuate and that the actuating arm and its components

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PIPER CHEROKEE SERVICE MANUAL

are operating freely. Check the pressure housing assembly for absence of cracks, breaks, or
fatigue. Check to ensure that the hydraulic valve and fittings are free of leaks.
Repair and check procedures for the hydraulic pump, cylinders and various components
may be found in Section VI of this manual.
2-34. SERVICING HYDRAULIC PUMP/RESERVOIR.
The fluid level of the reservoir of
the combination pump and reservoir should be checked every 50 hours by viewing the fluid
through the filler plug hole in the hydraulic pump. Access to the pump is through the panel at
the right rear side of the baggage compartment.
To check fluid level, remove the plug located on the forward side of the pump and
ascertain that fluid is visible up to the bottom of the filler plug hole. Should fluid be below the
hole, add fluid, MIL-H-5606A, through the filler hole until full. Reinstall the filler plug and
tighten.
NOTE
A small vent hole is located under the vent screw head. Retain
1/64 inch clearance between the screw head and the small vent
hole.
2-35. LANDING GEAR SYSTEM.
2-36. SERVICING LANDING GEAR. The landing gear consists of tires, brakes, oleo strut
assemblies and on some models, wheel fairings. The gear should be inspected for proper
extension, unscored piston tubes, soundness of hydraulic fluid seals, the security and firm
mechanical condition of all connection points and the absence of cracks in the fiberglass
fairings. Check the brake linings for excessive wear, the brake discs for scoring and replace as
necessary. The PA-28R should be checked for proper adjustment of down locks, the
mechanical soundness and firm action of drag and side brace links. Minor servicing is
described in the following paragraphs. Detailed service and overhaul instructions are given in
Sections VII or VIIA.
2-37. OLEO STRUTS. (PA-28-140; PA-28-150,-160,-180 and PA-28-235.)
2-38.. SERVICING OLEO STRUTS. Air-oil struts are incorporated in each landing gear
oleo to absorb the shock resulting from the impact of the wheels on the runway during landing.
To obtain proper oleo action, the nose gear oleo strut must have approximately 3.25 ± .25
inches of piston tube exposed, while the main gear struts require approximately 4.5 ±.50 inches
of tube exposure.

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PIPER CHEROKEE SERVICE MANUAL

CAUTION
Do not exceed the foregoingtube exposures.
These measurements are taken with the airplane setting on a level surface
under normal static load (empty weight of airplane plus full fuel and oil). If the
strut has less tube exposed than that prescribed, determine whether it needs air
or oil by raising the airplane on jacks. With the strut extended, remove the cap
from the air valve at the top of the housing and depress the valve core to allow
Allow the foam
air to escape from the strut piston until it is fully compressed.
from the air-oil mixture to settle and then determine if oil is visible up to the
bottom of the filler plug hole. If oil is visible at the bottom of the hole, then all
that is required is the valve be checked for unsatisfactory conditions and air added
as described in paragraph 2-41. Should fluid be at any level below the bottom of
the filler plug hole, the oleo should be checked for leaks, etc. and oil added as
described in paragraph 2-39 for the nose gear or paragraph 2-40 for the main
gear. For repair procedures of the landing gear and/or oleo struts, refer to
Section VII or VIIA.
WARNING
Do not release air byremovingthe strutvalve core or
filler plug. Depress the valve core pin until strut
chamber pressure has diminished.
CAUTION
Dirt and foreign particles form around the filler plugs
of the landing gear struts, therefore, before attempting to remove these plugs, the tops of the struts should
be cleaned with compressed air and/orwith a dry solvent.

2-39. FILLINGNOSE GEAROLEOSTRUT. Regardlessof the amountof oil requiredfill
the nose gear oleo strut with hydraulicfluid (MIL-H-5606)as follows:
a. Raise the airplane on jacks until the nose wheel is completely clear of the
ground. (Refer to Paragraph 2-13.)
b. Place a pan under the gear to catch spillage.
c. If not previously accomplished, remove the engine cowl and relieve air

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PIPER CHEROKEE SERVICE MANUAL

from the strut housing chamber by removing the cap from the air valve and depressingthe
valve core.
d. There are two methods by which the strut chamber may be filled and these are as
follows:
Method 1:
1. Remove the valve core from the filler plug at the top of the strut housing. Allow
the plug to remain installed.
2. Attach one end of a clear plastic hose to the valve stem of the filler plug and
submerge the other end in a container of hydraulic fluid. Ascertain that the end of the hose
on the valve stem is tight and the fluid container is approximately equal in height to the top
of the strut housing.
3. Fully compress and extend the strut thus drawing fluid from the fluid container
and expelling air from the strut chamber. By watching the fluid pass through the plastic
hose, it can be determined when the strut is full and no air is present in the chamber.
4. When air bubbles cease to flow through the hose, compress the strut fully and
remove the hose from the valvestem.
5. With strut compressed, remove the filler plug to determine that the fluid level is
visible up to the bottom of the filler plug hole.
6. Reinstall the core in the filler plug and apply thread lubricated (Parker#6PB) to
the threads of the filler plug and install the plug in the top of the strut housing.Torque the
plug to 45 foot pounds.
Method 2:
1. Remove the filler plug from the top of the strut housing.
2. Raise the strut piston until it is fully compressed.
3. Pour fluid from a clean container through the filler opening until it reaches the
bottom of the filler plug hole.
4. Install the filler plug finger tight, and extend and compress the strut two or three
times to remove any air that may be trapped in the housing.
5. Remove the filler plug, raise the strut to full compression and fill with fluid if
needed.
6. Apply thread lubricant (Parker #6PB) to the threads of the filler plug. Reinstall
the filler plug and torque to 45 foot pounds.
e. With the airplane raised, compress and extend the gear strut several times to
ascertain that the strut actuates freely. The weight of the gear fork and wheel should extend
the strut.
f. Clean off overflow of fluid, and inflate the strut as described in Paragraph 2-41.
g. Check that fluid is not leaking from around the strut piston at the bottom of the
housing.

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PIPER CHEROKEE SERVICE MANUAL

1757

951

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
IS.
19.
20.
21.

FILLER, FUEL TANK, LEFT
DRAIN, FUEL TANK, LEFT
FILTER, VACUUM REGULATOR AND CENTRAL AIR
RESERVOIR, BRAKE SYSTEM
SCREEN OR CARTRIDGE FILTER, OIL PRESSURE, ENGINE
OIL, ENGINE
FILLER/INDICATOR,
FILTER, FUEL PUMP, ELECTRIC
SCREEN, FUEL DRAIN
FILLER, OLEO SHOCK STRUT, NOSE
DRAIN, FUEL, ENGINE
SCREEN OIL SUCTION, ENGINE
FILTER, CARTRIDGE, ENGINE INDUCTION
TIRE, NOSE
CARBURETOR, ENGINE
FILLER, OLEO SHOCK STRUT, L AND R
DRAIN, FUEL TANK, RIGHT
TIRE, L AND R
FILLER, FUEL TANK, RIGHT
BATTERY
FILTER, INSTRUMENTS, (WITHOUT CENTRAL AIR FILTER)
AIR CONDITIONING SERVICE VALVES

Figure 2-36. Servicing Points
PA-28-140

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PIPER CHEROKEE SERVICE MANUAL

1812

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.

FILTER, INSTRUMENTS, (WITHOUT CENTRAL AIR FILTER)
FILLER, TIP FUEL TANK, LEFT
DRAIN, TIP FUEL TANK, LEFT
FILLER, MAIN FUEL TANK, LEFT
DRAIN, MAIN FUEL TANK, LEFT
FILTER, VACUUM REGULATOR AND CENTRAL AIR
RESERVOIR, BRAKE SYSTEM
SCREEN OR CARTRIDGE FILTER, OIL PRESSURE, ENGINE
FILLER/INDICATOR,
OIL, ENGINE
FILLER, OLEO SHOCK STRUT, NOSE
PROPELLER
TIRE, NOSE
CARBURETOR, ENGINE
FILTER, CARTRIDGE, ENGINE INDUCTION
SCREEN, OIL SUCTION, ENGINE
DRAIN, FUEL
FILLER, OLEO SHOCK STRUT, L AND R
DRAIN, MAIN FUEL TANK, RIGHT
FILLER, MAIN FUEL TANK, RIGHT
FILLER, TIP FUEL TANK, RIGHT
DRAIN, TIP FUEL TANK, RIGHT
BATTERY
FILTER, FUEL PUMP, ELECTRIC

Figure 2-38. Servicing Points
PA-28-235

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PIPER CHEROKEE SERVICE MANUAL

1811

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.

FILLER, FUEL TANK, LEFT
DRAIN, FUEL TANK, LEFT
FILTER, VACUUM REGULATOR AND CENTRAL AIR
RESERVOIR, BRAKE SYSTEM
SCREEN OR CARTRIDGE FILTER, OIL PRESSURE, ENGINE
OIL, ENGINE
FILLER/INDICATOR,
SCREEN, FUEL DRAIN
FILTER, CARTRIDGE, ENGINE INDUCTION
DRAIN, FUEL ENGINE
FILLER, OLEO SHOCK STRUT, NOSE
PROPELLER
TIRE, NOSE
INJECTOR, FUEL
SCREEN, OIL SUCTION, ENGINE
FILLER, OLEO SHOCK STRUT, L AND R
DRAIN, FUEL TANK, RIGHT
TIRE, L AND R
FILLER, FUEL TANK, RIGHT
PUMP/RESERVOIR,
HYDRAULIC SYSTEM
BATTERY
FILTER, INSTRUMENTS

Figure 2-39. Servicing Points
PA-28R

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1758

2-40. FILLING MAIN GEAR OLEO
STRUT. A main gear oleo strut that is
partly full or one that has been completely
emptied may be filled with MIL-H-5606
Fluid as follows:
a. Raise the airplane on jacks until the
landing gear torque link assembly has
almost reached its full travel. (Refer to
Paragraph 2-13.)
b. Place a pan under the gear to catch
spillage.
c. If not previously accomplished,
remove the cap on top of the wing to gain
access to the top of the strut housing, and
relieve air from the strut housing chamber
by removing the cap from the air valveand
depressing the valve core.
d. Remove any one of the three
torque link bolts, and again raise the
airplane until a minimum of ten inches (do
not exceed twelve inches of tube exposure)
of strut tube is exposed with the wheel
remaining on the ground. With this amount
of tube exposed, fluid will flow from the
middle chamber to the bottom chamber of
the strut housing, insuring that the bottom
chamber is filled with fluid.

FILLER
PLUG
FLUID
LEVEL
- STRUT
FULLY
COMPRESSED
STRUT
CHAMBER
- TOP
TOP
OFSTRUT
TUBE
FULLY
COMPRESSED

STRUT
CHAMBER
MIDDLE

TOP
OF
STRUT
TUBE
EXTENDED
10"
STRUT
CHAMBER
BOTTOM

STRUT
FULLY
COMPRESSED

STRUT
EXPOSURE
LOAD
STATIC
4.50 .50

NOTE
With the torque links
disconnected, the piston
tube is free to slide from
the strut housing.

STRUT
EXTENSION
UNDER
STATIC
LOAD

STRUTEXTENSION

e. Fill the main gear housing by one
of two methods which are as follows:
Method 1:
1. Remove the valve core from the
filler plug at the top of the strut housing.
Allow the plug to remain installed.

STRUT
EXTENDED
10"

Figure 2-40. Main Gear Oleo Struts
(Cut-away View) PA-28-140;
PA-28-150, -160, -180; PA-28-235

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PIPER CHEROKEE SERVICE MANUAL

2. Attach one end of a clear plastic hose to the valve stem of the filler plug and
submerge the other end in a container of hydraulic fluid.
3. Fully compress and extend (10 + 2-0 inches of strut tube exposed) the strut
thus drawing fluid from the strut chambers. By watching the fluid pass through the plastic
hose, it can be determined when the strut is full and no air is present in the chambers.The
strut must be extended to full ten inches to allow fluid to enter the bottom chamber of
strut housing.
4. When air bubbles cease to flow through the hose, compress the strut fully and
remove the hose from the valvestem.
5. With the strut fully compressed, remove the filler plug to determine that the
fluid level is visibleup to the bottom of the filler plug hole.
6. Reinstall the core in the filler plug and apply thread lubricant (Parker #6PB) to
the threads of the filler plug and install the plug in the top of the strut housing.Torque the
plug to 45 foot pounds.
Method 2:
1. Remove the filler plug from the top of the strut housing.
2. Raise the strut to full compression.
3. Pour fluid from a clean container through the filler opening until it is visible at
the top of the strut chamber. If the housing has been completely emptied or nearly so, allow
sufficient time for the fluid to drain through the orifice from the upper chamber into the
middle chamber.
4. Lower the gear until the wheel touches the ground (10 + 2-0 inches of strut
exposure) and then fully compress and extend the strut three or four times to remove any
air that may be trapped and to allow fluid to enter the bottom chamber of the housing.
5. Raise the strut to full compressionand if needed, fill with fluid to the bottom of
the filler plug.
6. Apply thread lubricant (Parker# 6PB) to the threads of the filler plug. Reinstall
the filler plug and torque to 45 foot pounds.
e. Replace the torque link bolt. Tighten bolt only tight enough to allowno side play in
the connection.
f. With the airplane raised, retract and extend the gear strut severaltimes to ascertain
that the strut actuates freely. The weight of the gear fork and wheel should extend the strut.
g. Clean off overflow of fluid and inflate the strut as described in Paragraph 2-41.
h. Check that fluid is not leaking around the strut piston at the bottom of the housing.
2-41. INFLATING OLEO STRUTS. After making certain that the oleo strut has
sufficient fluid, attach a strut pump to the air valve and inflate the oleo strut. The strut
should be inflated until the correct inches of piston is exposed with normal static load
(empty weight of airplane plus full fuel and oil) on the gears. (Refer to Paragraph 2-38.)
Rock the airplane several times to ascertain that the gear settles back to the correct strut
position. (If a strut pump is not available,the airplane may be raised and line pressure from
a high pressure air system used. Lower the airplane and while rocking it, let air from the
valve to bring the strut down to the proper extension.) Before capping the valve,check for
valve core leakage.

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PIPER CHEROKEE SERVICE MANUAL

2-42. OLEO STRUTS. (PA-28R)
2-43. SERVICING OLEO STRUTS. The air-oil type oleo strut should be maintained at
proper strut tube exposures for best oleo action. The nose gear strut must have
approximately 2.75 inches of piston tube exposed, while the main gear strut requires
approximately 2.0 inches of tube exposure. These measurementsare taken with the airplane
sitting on levelsurface under normal static load. (Empty weight of airplane plus full fuel and
oil.) If the strut has lesstube exposure than prescribed, determine whether it needs air or oil
by rocking the airplane. If the oleo strut oscillated with short strokes (approximately one
inch) and the airplane settles to its normal position within one or two cycles after the
rocking force is removed, the oleo strut requires inflating. Check the valve core and filler
plug for air leaks, correct if required, and add air as described in Paragraph 2-45. If the oleo
strut oscillateswith long strokes (approximately three inches) and the airplane continues to
oscillate after the rocking force is removed, the oleo struts require fluid. Check the oleo for
indications of oil leaks, correct if required and add fluid as described in Paragraph 2-44. For
repair proceduresof the landinggear and/or oleo struts, refer to Section VIIA.
WARNING
Do not release air by removing the strut valve core or filler
plug. Depressthe valve core pin until strut chamber pressure
has diminished.
CAUTION
Dirt and foreign particles form around the filler plugs of the
landing gear struts, therefore, before attempting to remove
these plugs, the tops of the struts should be cleaned with
compressedair and/or with a dry solvent.

THIS SPACEINTENTIONALLYLEFT BLANK

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2-44. FILLING OLEO STRUTS. To fill the nose or main gear oleo strut with fluid
(MIL-H-5606), whether it be the addition of a small or large amount, proceed as follows:
a. Raise the airplane on jacks. (Refer to Paragraph 2-13.)
b. Place a pan under the gear to catch spillage.
c. At the filler plug, relieve air pressure from the strut housing chamber by removing
the cap from the air valveand depressingthe valvecore.
d. There are two methods by which the strut chamber may be filled and these are as
follows:
Method 1:
1. Remove the valve core from the filler plug at the top of the nose gear strut
housing or at the top inboard side of the main gear housing. Allow the filler plug to remain
installed.
2. Attach one end of a clean plastic hose to the valve stem of the filler plug and
submergethe other end in a container of hydraulic fluid.
NOTE
An air-tight connection is necessary between the plastic tube
and the valve stem. Without such a connection, a small
amount of air will be sucked into the oleo strut during each
sequence, resulting in an inordinate amount of air bubbles
and a prolonged filling operation.
3. Fully compress and extend the strut thus drawing fluid from the fluid container
and expelling air from the strut chamber. By watching the fluid pass through the plastic
hose, it can be determined when the strut is full and no air is present in the chamber.
4. When air bubbles cease to flow through the hose, compress the strut fully and
remove the hose from the valvestem.
5. With the strut compressed, remove the filler plug to determine that the fluid
level is visible up to the bottom of the filler plug hole.
6. Reinstall the core in the filler plug and apply thread lubricant (Parker#6PB) to
the threads of the filler plug and install the plug in the top of the strut housing.Torque the
plug to 45 foot pounds.
Method 2:
1. Remove the filler plug from the top of the nose gear strut housing or at the top
inboard side of the main gear housing.
2. Raise the strut piston tube until it is fully compressed.
3. Pour fluid from a clean container through the filler opening until it reaches the
bottom of the filler plug hole. (Air pressure type oil container may be helpful.)
4. Install the filler plug finger-tightand extend and compress the strut two or three
times to remove air from the housing.
5. Remove the filler plug, raise the strut to full compression and fill with fluid if
needed.

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6. Apply thread lubricant (Parker#6PB) to the threads of the filler plug. Reinstall
the filler plug and torque -to 45 foot pounds.
e. With the airplane raised, compress and extend the gear strut several times to
ascertain that the strut movesfreely. The weightof the gear fork and wheel should extend the
strut.
f. Clean off overflow of fluid and inflate the strut as described in Paragraph 2-45.
g. Check that fluid is not leaking around the strut piston at the bottom of the housing.

2-45. INFLATING OLEO STRUTS. After making certain that an oleo strut has sufficient
fluid, attach a strut pump to the air valve and inflate the oleo strut. The strut should be inflated
until the correct inches of piston are exposed with normal static load on the gears (empty
weight of the airplane plus full fuel and oil). (Refer to Paragraph 2-43.) Rock the airplane
severaltimes to ascertain that the gear settles back to the correct strut position. If a strut pump
is not available, the airplane may be raised and line pressure from a high pressure air system
used. Lower the airplane and whilerocking it, let air from the valveto bring the strut down to
the proper extension. (Beforecapping the valve, check for tightness of the valve core, that is,
no leakage.)

2-46. BRAKESYSTEM.

2-47. SERVICING BRAKE SYSTEM. The brake system incorporates a hydraulic fluid
reservoir through which the brake system is periodically serviced. Fluid is drawn from the
reservoir by the brake cylinders to maintain the volume of fluid required for maximum
braking efficiency. Spongy brake pedal action is often an indication that the brake fluid
reservoir is running low on fluid. Instructions for filling the reservoir are given in Paragraph
2-48. When necessaryto repair any of the brake system components, or to bleed the system,
refer to instructions in Section VII or VIIA.
2-48. FILLING BRAKE CYLINDER RESERVOIR. The brake cylinder reservoir should
be filled to the level marked on reservoir, with the fluid specified in Table II-I. The reservoir,
located on the left side of the fire wallin the engine compartment, should be checked at every

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PIPER CHEROKEE SERVICE MANUAL

50 hour inspection and replenish as necessary. No adjustment of the brakes is necessary,
though they should be checked periodically per instructions given in Section VII or VIIA.

2-49. DRAINING BRAKE SYSTEM. To drain the brake system, connect a hose to the
bleeder fitting on the bottom of the cylinder and place the other end of the line in a suitable
container. Open the bleeder and slowly pump the hand brake lever and the desired brake
pedal until fluid ceases to flow. To clean the brake system, flush with denatured alcohol.

2-50.

TIRES.

2-51. SERVICING TIRES. The tires should be maintained at the pressure specified in
Table II-I. When checking tire pressure, examine the tires for wear, cuts, bruises and slippage
on the wheel. The tire, tube, and wheel should be properly balanced when installed with the
index mark on the tire aligned with the index mark on the tube.

2-52.

POWER PLANT.

2-53. SERVICING POWER PLANT. Regularly check the engine compartment for oil and
fuel leaks, chaffing of lines, loose wires and tightness of all parts. For cleaning of the engine
compartment, refer to paragraph 2-24. Maintenance instructions for the power plant may be
found in Section VIII or VIIIA of this manual and in the appropriate manufacturers'
manuals.

2-54.

INDUCTION AIR FILTER.

2-55. REMOVAL OF AIR FILTER. (Refer to INSPECTION, SECTION III, for additional
requirements.)
a. PA-28-140, PA-28-150, -160, -180, Serial Nos. 28-1 to 28-1760 incl. The induction
air filter is located below the spinner assembly within the nose cowling. If the airplane is
equipped for night flying, a landing light will be installed within the center of the filter
assembly. The filter may be removed in accordance with the following instructions:
1. Within the aft side of the nose cowl, loosen and remove the thumb screw on the
back of the assembly.
2. Remove the retainer assembly. If a landing light is installed, it will be necessary
to remove the wires aft the connections on the light before removal.

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3. Remove the filter and clean or replace in accordance with Paragraph 2-56.
b. On PA-28-180, Serial Nos. 28-1761and up, the filter is located on the right side and
midway in the engine compartment and may be removed by the following procedure:
1. Remove the two nuts and washers on the cover assemblyand pull off the cover.
2. The filter is now free to be removed and cleaned per Paragraph 2-56.
c. On PA-28-235, Serial Nos. 28-10003to 28-10560incl., the air filter is located on the
right side and midway in the engine compartment. For removal, refer to the followingsteps:
1. Loosen and remove the wing nut on the filter cover and remove cover.
2. Remove the filter and clean or replace in accordance with Paragraph 2-56.
d. On PA-28-235,Serial Nos. 28-10561and up, the air filter is located on the right side of
the engine and in front of the fire wall. Remove the filter per the following instructions:
1. Remove the two wing nuts and remove the cover.
2. The filter is now free to be removed and cleaned per Paragraph 2-56.
e. On PA-28R, the filter is located on the left side and just in front of the fire wall. Remove by the following procedure:
1. Loosen the three studs and carefullymove the cover assemblyaside. Be sure not to
damage or bend the alternate air cable.
2. The filter is now free for removal. Clean or replace the filter as givenin Paragraph
2-56.

2-56. SERVICE INSTRUCTION. (CLEANING AND INSPECTION.)
a. The filter should be cleaneddaily when operating in dusty conditions and if any holes
or tears are noticed, the filter should be replaced immediately. For type of replacement filter,
refer to PA-28 Parts Catalog.
b. Remove the filter elementand shake off loose dirt by tapping on a hard surface, being
careful not to damage or crease the sealing ends.
CAUTION
Never wash the filter element in any liquid or soak in oil. Never
attempt to blow off dirt with compressed air.
c. The filter housing can be cleaned by wiping with a clean cloth soaked in suitable quick
drying type solvent. When the housing is dry, reinstall in accordance with Paragraph 2-56.

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2-57. INSTALLATION OF AIR FILTER. After cleaning and inspection, install
the filter element and cover in reverse order of removal instructions.
2-58. PROPELLER.

2-59. SERVICING PROPELLER. The spinner, back plate and propeller surfaces should
be cleaned and inspected frequently for freedom from nicks, scratches, corrosion and cracks.
Minor nicks and scratchesmay be removedas found in SectionVIII or VIIIA. The face of each
blade should be painted when necessarywith a flat paint to retard glare. To prevent corrosion,
wipe surfaces with a light oil or wax.
In addition, constant speed propellers should be inspected for absence of grease or oil
leakage and freedom of rotation on the hub pilot tube. To check freedom of rotation, rock the
blade back and forth through the slight freedom allowed by the pitch change mechanism.
Lubricate the propeller at 100-hour intervals in accordance with the Lubrication Chart.
Additional service information for the propeller may be found in Section VII, VIII or
VIIIA.

2-60. FUEL SYSTEM.

2-61. SERVICING FUEL SYSTEM.
a. At intervals of 50 hours or 90 days, whichevercomesfirst, clean the fuelscreensand / or
filters as follows:
1. PA-28-140; PA-28-150, -160, -180. The fuel strainer screen, located in the fuel
bowl, mounted on the lower left side of the fire wall; the screen in the electric fuel pump,
located at the lower left side of the engine compartment; and the screen in the inlet side of the
carburetor.
2. PA-28-235.The screens and bowl of the fuelfilter unit of the fuel selector and the
screen of the electricfuel pump(s), located in the area under the rear seat aft of the main spar;
and the screen located in the inlet side of the carburetor.
3. PA-28R. The fuel strainer screen, located in the fuel bowl mounted on the lower
left side of the fire wall; and the screen in the inlet side of the injector.
b. Remove and clean the screens in accordance with the instructions outlined in Section
IX. Additional serviceinformation is given in Section IX. Inspection intervals of the various
fuel system components is given in Section III.

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2-62. FILLING FUEL TANKS. (PA-28-140; PA-28-150, -160, -180 and PA-28R.) Observe
all required precautions for handling gasoline. Fill the fuel tanks with the fuel as specified in
Table II-I. Each fuel tank holds a maximum of 25 U.S. gallons. To obtain the standard fuel
quantity of 36 U.S. gallons total, or 18 gallons per tank, the tanks are filled only to the bottom
of the filler neck tube or visual indicator, each of which extend into the fuel tank about 3.50
inches. To obtain the standard plus reserve quantity, the tanks are filled to the top of the filler
neck.
2-63. FILLING FUEL TANKS. (PA-28-235.) The fuel tanks of each wing are filled through
filler necks located on the forward slope of the wings and at the wing tip. Each wing tank holds
25 U.S. gallons while each tip tank holds 17 U.S. gallons. Observe all required safety precautions for handling gasoline. Fill the tanks with fuel as specified on the placard adjacent to
the filler neck or as indicated in Table II-I.
2-64. DRAINING MOISTURE FROM FUEL SYSTEM. (PA-28-140, -150, -160, -180 and
PA-28R.) The fuel tanks and fuel strainer should be drained daily prior to first flight and after
refueling to avoid the accumulation of water or sediment. Each fuel tank is equipped with an
individual quick drain located at the lower inboard rear corner of the tank. The fuel strainer
with a quick drain valve (refer to Figure 2-41) is located on the lower left side of the fire wall.
Drain fuel tanks and strainer per the following:
a. Drain each tank through its individual quick drain located at the lower inboard rear
corner of the tank, making sure that enough fuel has been drained to insure that all water
and sediment is removed.
b. Place a container under the fuel strainer drain. Drain the fuel strainer by opening the
quick drain on the strainer.
c. Examine the contents of the container placed under the fuel strainer drain for water
and sediment and dispose of the contents.
CAUTION
When draining any amount of fuel, care should be taken to
insure that no fire hazard exists before starting engine.
2-65. DRAINING MOISTURE FROM FUEL SYSTEM. (PA-28-235.) The fuel system
should be drained daily prior to first flight and after refueling to avoid the accumulation of
water or sediment. Each fuel tank is equipped with an individual quick drain located at the
lower inboard rear corner of the tank. The fuel strainer and a system quick drain valve (refer
to Figure 2-42) are located in the fuselage at the lowest point of the fuel system. It is
important that the fuel system be drained in the following manner:

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A658

1.
2.
3.
4.
5.

1673

BOWL
4
BAIL
SAFETY WIRE
DRAIN
THUMB NUT

1.
2.
3.
4.
5.

—

Figure 2-41. Fuel Strainer
PA-28-140; PA-28-150,-160, -180
PA-28R

DRAIN LEVER
LEVER ACCESS DOOR
SELECTOR ROD ASSEMBLY
DRAIN
RIGHT TIP TANK

6.
7.
8.
9.

RIGHT MAIN TANK
LEFT MAIN TANK
LEFT TIP TANK
TO FUEL PUMPS

Figure 2-42. Fuel Selector and Filter
PA-28-235

a. Drain each tank through its individual quick drain located at the lower inboard rear
corner of the tank, making sure that enough fuel has been drained to insure that all water
and sediment is removed.
b. Place a container under the fuel sump drain outlet, which is located under the
fuselage.
c. Drain the fuel strainer by pressing down on the lever located on the right-hand side
of the cabin below the forward edge of the rear seat. The fuel selector must be positioned in
the following sequence: off position, left tip, left main, right main, and right tip while
draining the strainer to insure that the fuel lines between each tank outlet and fuel strainer
are drained as well as the strainer. Whenthe fuel tanks are full, it will take approximately 11
seconds to drain all the fuel in one of the lines between a tip tank and the fuel strainer and
approximately six seconds to drain all the fuel in one of the lines from a main tank to the
fuel strainer. When the fuel tanks are less than full, it will take a few secondslonger.
d. Examine the contents of the container placed under the fuel sump drain outlet for
water and sediment and dispose of the contents.
CAUTION
When draining any amount of fuel, care should be taken to
insure that no fire hazard exists before starting engine.
NOTE
After using the underseat quick drain, it should be checked
from outside to make sure it has closed completely and is not
leaking.

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2-66. DRAINING FUEL SYSTEM. Fuel may be drained from the system by opening the
valve at the inboard end of each fuel tank. Push up on the arms of the drain valve and turn
counterclockwise to hold the drain in the open position. The flush type drain valve requires
the drain cup pin to hold valve open. The remaining fuel in the system may be drained through
the filter bowl. Any individual tank may be drained by closing the selector valve and then
draining as desired.
2-67. ANTI-ICING FUEL ADDITIVE. The operation of the aircraft is approved with an
anti-icing additive in the fuel. When an anti-icing additive is used it must meet the specification
MIL-1-27686. must be uniformly blended with the fuel while refueling, must not exceed .15%
by volume of the refueled quantity, and. to ensure its effectiveness, should be blended at not
less than .10% by volume. One and one half liquid ozs. per ten gallon of fuel would fall within
this range. A blender supplied by the additive manufacturer should be used. Except for the
information contained in this section, the manufacturer's mixing or blending instructions
should be carefully followed.
CAUTION
Assure that the additive is directed into flowing fuel stream.
The additive flow should start after and stop before the fuel
flow. Do not permit the concentrated additive to come in
contact with the aircraft painted surfaces or the interior
surfaces of the fuel tanks.
Some fuels have anti-icing additives preblended in the fuel at
the refinery, so no further blending should be performed.
Fuel additive cannot be used as a substitute for preflight
draining of the fuel system drains.

2-68. ELECTRICAL SYSTEM.
2-69. SERVICING ELECTRICAL SYSTEM. Servicing the electrical system involves adding
distilled water to the battery to maintain correct electrolyte level, and checking cable
connections and for any spilled electrolyte that would lead to corrosion. The security of all
electrical connections should be checked as well as the operation of all lights, general
condition of the generator or alternator and starter. All electrical wires should be inspected
for chafing and bare wires. For detailed information on this system, refer to Section XI of
this manual.

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2-70. LUBRICATION.
2-71. OIL SYSTEM. (ENGINE.)
2-72. SERVICINGOIL SYSTEM. The engine oil level should be checked before each flight
and changed after each 50 hours of engine operation. During oil change, the oil screen(s)
should be removed and cleaned, and when installed, the oil filter cartridge replaced.
Intervals between oil changes can be increased as much as 100%on engines equipped with
full flow (cartridge type) oil filters provided the element is replaced each 50 hours of
operation. Should fuel other than the specified octane rating for the power plant be used,
refer to the latest revision of Lycoming Service Letter No. L185 for additional information
and recommended service procedures. The engine manufacturer does not recommendoils by
brand names. Use a quality brand Aviation Grade Oil of the proper season viscosity.For information on the use of detergent oil, refer to paragraph 2-77 and/or the latest revision of
Lycoming Service Instruction No. 1014.
CAUTION
Do not introduce any trade additive to the basic lubricant
unless recommended by the engine manufacturer.
2-73. FILLING OIL SUMP. The oil sump should normally be filled with oil to the mark on
the engine dipstick. The quantity of oil required for the enginesmay be found in Table II-I.
The specified grade of oil may be found in Table II-IX, the Lubrication Chart, or on the
right cowl panel or each engine oil filler accessdoor. To servicethe engine with oil, open the
right cowl panel or quick release accessdoor on top of the cowl and remove the oil filler cap
with dipstick.

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PIPER CHEROKEE SERVICE MANUAL

2-74. DRAINING OIL SUMP. To drain the oil sump, provide a suitable container with a
minimum capacity of that required to fill the sump. Remove the engine cowl and open the
oil drain valve located on the underside of the engine by pushing the arms of the drain up
and turning counterclockwise. This will hold the drain in the open position. It is
recommended the engine be warmed to operating temperature to insure complete draining
of the old oil.
CAUTION
On PA-28R-200 aircraft, if an oil quick drain valve is
installed, ascertain that it is Piper P/N 492 172. (Refer to the
latest revisionof Piper ServiceLetter No. 534.)
2-75. OIL SCREENS. (SUCTION.) The oil suction screen, located either on the bottom
aft end of the engine sump, installed horizontally, or forward of the carburetor installed
vertically. To remove both types, cut the safety wire and remove the hex head plug. The
screen should be cleaned at each oil change to remove any accumulation of sludge and to
examine for metal filings or chips. If metal particles are found in the screen, the engine
should be examined for internal damage. After cleaning and inspection, place the screen
inside the recess in the hex head plug, to eliminate possible damage to the screen. Insert the
screen into the housing and when certain that the screen is properly seated, tighten and
safety the plug with MS-20995-C41safety wire.
2-76. OIL SCREEN. (PRESSURE.) The oil pressure screen, located in a housing on the
accessory case of the engine, between the magnetos, should be cleaned at each oil change to
remove any accumulation of sludge and to examine for metal filings or chips. If metal
particles are found in the screen, the engine should be examined for internal damage.When
reinstalling the screen, it is recommended that a new gasket be used. Ascertain that the
screen fits flush with the base surface of the screen housing. Position housing on mounting
pad and install attachment bolts. Torque bolts within 50 to 70 inch-pounds.
2-77. OIL FILTER. (FULL FLOW.)
a. The oil filter element should be replaced after each 50 hours of engine operation;
this is accomplished by removing the lockwire from the bolt-head at the end of the filter
housing, looseningthe bolt, and removingthe filter assemblyfrom the adapter.
b. Before discarding the filter element, remove the outer perforated paper cover, and
using a sharp knife, cut through the folds of the element at both ends, close to the metal
caps. Then, carefully unfold the pleated element and examine the material trapped in the
filter for evidence of internal engine damage such as chips or particles from bearings.In new
or newly overhauled engines,some small particle of metallic shavingsmight be found; these
are generally of no consequence and should not be confused with particles produced by
impacting, abrasion or pressure. Evidenceof internal engine damage found in the oil filter
justifies further examination to determine the cause.

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c. After the element has been replaced, tighten the attaching bolt within 15 to 18
foot-pounds of torque. Lockwire the bolt through the loops on the side of the housing to
the drilled head of the thermostatic valve. Be sure the lockwire is replaced at both the
attaching bolt head and the thermostatic oil cooler bypassvalve.
2-78. RECOMMENDATIONSFOR CHANGING OIL. (Refer to the latest revision of
Lycoming ServiceInstruction No. 1014 and Lycoming ServiceLetter No. L185.)
a. In engines that have been operating on straight mineraloil for severalhundred hours,
a change to additive oil should be made with a degree of caution, since the cleaningaction
of some additive oils will tend to loosen sludge deposits and cause plugged oil passages.
When an engine has been operating on straight mineral oil and is known to be in excessively
dirty condition, the switch to additive or compounded oil should be deferred until after the
engineis overhauled.
b. When changing from straight mineral oil to compounded oil, the following
precautionary steps should be taken:
1. Do not add additive oil to straight mineral oil. Drain the straight mineral oil
from the engine and fill with additiveoil.
2. Do not operate the engine longer than five hours before the first oil change.
3. Check all oil screens for evidence of sludge or pluggingand change oil every ten
hours if sludge conditions are evident. Resume normal oil drain periods after sludge
conditions improve.
2-79. LUBRICATION INSTRUCTIONS.Proper lubrication procedures are of
immeasurable value both as a means of prolonging the service life of the airplane and as a
means of reducing the frequency of extensive and expensive repairs. The periodic
application of recommended lubricants to their relevant bearing surfaces, as detailed in the
following paragraphs, together with observance of cleanliness,will insure the maximum
efficiency and utmost service of all moving parts. Lubrication instruction regarding the
locations, time intervals, and type of lubricants used may be found in the Lubrication Chart.
To insure the best possible results from the application of lubricants, the following
precautions should be observed:
a. Use recommended lubricants. Where general purpose lubricatingoil is specified, but
unavailable,clean engine oil may be used as a satisfactory substitute.
b. Check the components to be lubricated for evidence of excessivewear and replace
them as necessary.
c. Remove all excess lubricants from components in order to prevent the collection of
dirt and sand in abrasivequantities capable of causing excessivewear or damage to bearing
surfaces.
2-80. APPLICATION OF OIL. Whenever specific instructions for lubrication of
mechanismsrequiring lubrication are not available,observe the followingprecautions:
a. Apply oil sparingly,never more than enough to coat the bearing surfaces.
b. Since the control cables are sufficiently coated by the manufacturer, additional
protection for the prevention of corrosion is unnecessary.
c. Squeeze the magneto cam follower felts at regular inspection periods. If oil appears
on fingers, do not add oil. If the felt is dry, moisten with light oil.

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CAUTION
Be careful not to add too much oil, because the excess will be
thrown off during operation and will cause pitting and
burning of the magneto points.
2-81. APPLICATIONGREASE. Care must be taken when lubricating bearingsand bearing
surfaces with a grease gun, to insure that gun is filled with new, clean grease of the grade
specified for the particular application before applying lubricant to the grease fittings.
a. Where a reservoiris not provided around a bearing, apply the lubricant sparinglyand
wipe off any excess.
b. Remove wheel bearings from the wheel hub and clean thoroughly with a suitable
solvent. When repacking with grease, be sure the lubricant enters the space between the
rollers in the retainer ring. Do not pack the greaseinto the wheel hub.
c. Use extra care when greasingthe constant speed propeller hub to avoidblowing the
clamp gaskets. Remove one grease fitting and apply grease to the other fitting until fresh
grease appearsat the hole of the removed fitting.
2-82. WINTERIZATION PLATE. For winter operations there is a winterization plate kit,
No. 763 828Vavailable. When the ambient temperature is 50°F or lessthe plate is installed on
the inlet opening of the oil cooler plenum chamber.
Whenthe plate is not being used it can be stowed on a bracket, provided for this purpose,
located on the oil cooler plenum chamber.
2-83. LUBRICATION CHARTS. A series of lubrication charts (starting with Figure 2-43)
depict numbered lubrication points and the tables therein list the component to be lubricated
along with the type of lubricant and frequency of lubrication.
The following special instructions, Note and Cautions apply when lubricating various
items of the aircraft.
a. Bearings and Bushings - Clean exterior with a dry type solvent before lubricating.
b. Lubrication Points - Wipe all lubrication points clean of old grease, oil, dirt, etc.,
before lubricating.

THIS SPACEINTENTIONALLYLEFT BLANK

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PIPER CHEROKEE SERVICE MANUAL

TABLE II-IX. RECOMMENDED ENGINE LUBRICATING OILS
Average
Grade Oil
SAE 50

Average Ambient
Air Temperature

Oil Inlet Temperatures
Desired
Maximum

Above 60° F

180° F
(82 ° C)

(16 ° C)

245 ° F
(118 ° C)

30 ° F to 90 ° F
(-1 ° C to 32 ° C)

180° F

2450 F

(82 ° C)

(118 ° C)

SAE 30

0 ° F to 70 ° F
(-17 ° Cto 20 ° C)

170 ° F
(77 ° C)

225 ° F
(107 ° C)

SAE 20

Below 10° F

160° F

210 ° F
(99 ° C)

SAE 40

(12 °

(71 °

C)

C)

TABLE II-X. THREAD LUBRICANTS
TYPE OF LUBRICANT

TYPE OF LINE
Brakes

MIL-H-5606

Freon

TT-A-580or MIL-T-5544,Anti-SeizeCompound

Fuel

MIL-T-5544,Anti-Seize,Graphite Petrolatum

Landing Gear (Air Valve)

6PBParker

Oil

MIL-G-6032,Lubricating Grease
(Gasolineand Oil Resistant)

Pitot and Static

TT-A-580(JAN-A-669),Anti-SeizeCompound
(WhiteLead Base)

NOTE
Lubricate engine fittings only with the fluid contained in the particular lines.

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PIPER CHEROKEE SERVICE MANUAL

TABLE II-XI. SUMMARY OF RECOMMENDED LUBRICANTS USED
ON PA-28 SERIES AIRCRAFT

LUBRICANT

SPECIFICATION

LUBRICATING OIL, GENERAL PURPOSE, LOW
TEMPERATURE

MIL-L-7870

LUBRICATING OIL, AIRCRAFT RECIPROCATING ENGINE (PISTON) GRADE AS
SPECIFIED
SAE 50 ABOVE 60°F AIR TEMP.
SAE 40 30 ° TO 90°F AIR TEMP.
SAE 30 0 ° TO 70°F AIR TEMP.
SAE 20 BELOW 10OF AIR TEMP.

MIL-L-6082

HYDRAULIC FLUID PETROLEUM BASE

MIL-H-5606

GREASE, AIRCRAFT AND INSTRUMENT, GEAR
AND ACTUATOR SCREW

MIL-G-23827

PREFERRED PRODUCT
AND VENDOR

TEXACO MARFAK ALL
PURPOSEGREASE,
MOBIL GREASE 77
(OR MOBILUX EP2),
SHELL ALVANIA EP
GREASE 2

GREASE, AIRCRAFT HIGH TEMPERATURE

PARKER O-RING LUBRICANT
FISKE BROS.
REFINING CO.

AERO LUBRIPLATE
OR
MAG-1
FLUOROCARBON RELEASE AGENT DRY
LUBRICANT

MS-122

GREASE - LUBRICATION GENERAL
PURPOSE AIRCRAFT

MI L-G-7711

SILICONE, COMPOUND

MIL-C-21567

GREASE, AIRCRAFT WIDE-TEMPERATURE

MIL-G-81322

MOBIL GREASE 28
AERO SHELL GREASE 22

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COMPONENT
1.
2.
3.
4.
5.

OLEO STRUT FILLER POINT
UPPER TORQUE LINK BEARING
TORQUE LINK BUSHING
TORQUE LINK CONNECTING BUSHING
MAIN WHEEL BEARING

6.

EXPOSED OLEO STRUT

7.

BRAKE

LUBRICANT
MIL-H-5606
MIL-G-23827
MIL-L-7870
MIL-G-23827
TEXACO MARFAX ALL
PURPOSE GREASE OR
MOBIL GREASE 77
(OR MOBIL EP2
GREASE)
FLUOROCARBON
RELEASE
AGENT DRY LUBRICANT
MS-122
MIL-H-5606

RESERVOIR

FREQUENCY
AS REQUIRED
100 HRS
100 HRS
100 HRS

100 HRS
100 HRS
100 HRS

C333

2.

the roller and cone. Do not pack grease in wheel
housing. Wheel bearings require cleaning and repacking
after exposure to an abnormal quantity of water.
Oleo struts and brake reservoir - Fill per Instructions on
unit or container or refer to service manual.

Figure 2-43. Lubrication Chart (Landing Gear, Main) PA-28-140,-150, -160, -180 and -235
Reissued: 1/15/81

HANDLINGAND SERVICING

1E17

0

a

PIPER CHEROKEE SERVICE MANUAL

COMPONENT
1.
2.
3.
4.
5.

OLEO STRUT FILLER POINT
STEERING
BELLCRANK PIVOT POINT
SHIMMY DAMPENER PIVOT POINT
TORQUE LINK ASSEMBLY
NOSE WHEEL BEARING

6.
7.

NOSE GEAR STEERING
ROD END BEARINGS
BUNGEE SEAL (1974 MODELS AND UP)

8.

EXPOSED

LUBRICANT
MIL-H-S606
MIL-L-7870
MIL-L-7870
MIL-L-7870
TEXACO MARFAX ALL
PURPOSE GREASE OR
MOBIL GREASE 77
(OR MOBIL EP2
GREASE)
MIL-L-7870
PARKER O-RING
LUBRICANT
FLUOROCARBON
RELEASE
AGENT DRY LUBRICANT
MS-122

OLEO STRUT

FREQUENCY
AS REQUIRED
100 HRS
100 HRS
100 HRS

100 HRS
100 HRS
100 HRS
100 HRS

C334

7

6

7

SPECIAL INSTRUCTIONS
Nose wheel bearings
Disassemble and clean with a dry
type solvent. Ascertain that grease is packed between
the roller and cone. Do not pack grease in wheel
housing. Wheel bearings require cleaning and repacking
after exposure to an abnormal quanity of water.
Oleo struts - Fill per instructions
on unit or refer to
service manual.
Bungee - Lubricate springs if bungee Is disassembled.

Figure 2-45. Lubrication Chart (Landing Gear, Nose) PA-28-140,-150, -160, -180 and -235
Reissued: 1/15/81

1E19

HANDLINGAND SERVICING

PIPER CHEROKEE SERVICE MANUAL

LUBR ICANT

COMPONENT

3.
4.
5.

NOSE GEAR STRUT HOUSING GREASE FITTING
NOSE GEAR PIVOT POINT AND HYDRAULIC
ROD END
CYLINDER
MECHANISM
NOSE GEAR DOOR RETRACTION
NOSE GEAR DOOR HINGES
EXPOSED OLEO STRUT

6.

NOSE WHEEL BEARINGS

7.
8.

NOSE GEAR DRAG LINK ASSEMBLIES
NOSE GEAR TORQUE LINK ASSEMBLY AND
STRUT HOUSING
DOWNLOCK, ROLLER TENSION SPRING,
SHIMMY DAMPENER AND ALIGNING ROLLER
PIVOT POINTS
NK PIVOT POINTS AND
STEERING BELLROD ENDS
NOSE GEAR OLEO STRUT FILLER POINT
BUNGEE SPRING (1974 MODELS AND UP)
FIRE WALL BUNGEE SEAL (1974 MODELS AND UP)

1.
2.

9.

10.
11.
12.
13.

FREQUENCY

MIL-G-23827

100 HRS

MIL-L-7870
MIL-L-787 0
MIL-L-787 0
RELEASE
FLUOROCARBON
AGENT DRY LUBRICANT
MS-122
TEXACO MARFAX ALL
PURPOSE GREASE OR
MOBIL MOBIL GREASE
77 (OR MOBIL EP2
GREASE)
MIL-L-7870

100 HRS
100 HRS
100 HRS

MIL-G-23827

100 HRS

MIL-L-787 0

100 HRS

MIL-L-7870
MIL-H-5606
MIL-G-7711
AERO LUBRIPLATE

100 HRS

100 HRS
100 HRS

100 HRS
AS REQUIRED
100 HRS
100 HRS

1723

SPECIAL INSTRUCTIONS
1.

2.

Nose wheel bearings- Disassemble and clean with a
dry type solvent. Ascertain that grease Is packed
between the roller and cone. Do not pack grease In
wheel housing. Wheel bearings require cleaning and
repacking after exposure to an abnormal quantity of
water.
Oleo struts - Fill per Instructions on unit or refer to
service manual.

Figure 2-46. Lubrication Chart (Landing Gear, Nose) PA-28R-180and -200
HANDLING AND SERVICING

Reissued: 1/15/81

1E20

PIPER CHEROKEESERVICEMANUAL
-

CA UTION -

Do not lubricatecontrol wheelshaft or bushing. Cleanonly using
alcohol or other suitable solvent.
COMPONENT
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.

AILERON HINGE PINS
FLAP HINGE BEARINGS
STABILATOR
HINGE PINS
RUDDER HINGE BEARINGS
CONTROL CABLE PULLEYS
TRIM CONTROL WHEELOR OVERHEAD
O-RING CONTROL SHAFT BUSHING

MIL-L-7870
MIL-L-7870
MIL-L-787 0
MIL-L-7870
MIL-L-787
MIL-L-7870
PARKER O-RING
LUBRICANT
MIL-L-7870
MIL-L-7870
MIL-L-787 0
MIL-L-787 0

CRANK

TEE BAR PIVOT POINT
CONTROL COLUMN CHAIN
CONTROL COLUMN FLEX. JOINTS AND SPROCKET
CONTROL
STABILATOR

SPECIAL
**

LUBRICANT

FREQUENCY
100
100
100
100
100
100

HRS
HRS
HRS
HRS
HRS
HRS

**
AS REQUIRED
100 HRS
500 HRS
100 HRS
100 HRS

INSTRUCTIONS

Disassemble "0"
ring retainer plates
from Instrument panel; lubricate "0"
ring and reassemble (on 1.125 Inch dia.
shaft only).

8
11
SPECIAL

INSTRUCTIONS

Aileron hinges with teflon sleeves should not be lubricated.
Aileron hinges without teflon sleeves should first be cleaned
with a dry type solvent then lubricated with MIL-L-7870.

Figure 2-47. Lubrication Chart (Control System)
InterimRevision:July 30, 11986

1E21

1E21

HANDLING AND SERVICII

LL

PIPERCHEROKEESERVICEMANUAL

COMPONENT
1.

RUDDER

TUBE BEARING

2.
3.
4.

TOE BRAKE CYLINDER ATTACHMENTS
RUDDER TUBE CONNECTIONS
BRAKE ROD ENDS

LUBRICANT

BLOCKS

FLUOROCARBON
RELEASE
AGENT DRY LUBRICANT
MS-122
MIL-L-7870
MIL-L-7870
MIL-L-7870

FREQUENCY

100
100
100
100

HRS
HRS
HRS
HRS

937

1608

1720

SKETCH
A PA-28-140,150,-160,-180
AND-235

SKETCH
A PA-28R-180AND.200

Figure 2-49. Lubrication Chart (Control System) (cont.)
Reissued: 1/15/81

1E23

1E23

HANDLING AND SERVICING

PIPER CHEROKEE SERVICE MANUAL

LUBRICANT

COMPONENT
1.
2.

RUDDER ARM CABLE ENDS
TRIM SCREW
STABILATOR

3.
4.
5.

LINKS
SCREW/TAB
STABILATOR
HINGE POINTS
STABILATOR
RUDDER TRIM ASSEMBLY

MIL-L-7870
AERO LUBRIPLATE,
FISKE BROS. REFINING CO.
MIL-L-787 0
MIL-L-7870
MIL-L-7870

FREQUENCY
100 HRS
100
100
100
100

HRS
HRS
HRS
HRS

937

1810

938

SKETCH B

SKETCH A

Figure 2-50.

Reissued: 1/15/81

Lubrication Chart (Control System) (cont.)

1E24

HANDLING AND SERVICING

PIPER CHEROKEE SERVICE MANUAL

COMPONENT
1.
2.

DOOR HINGES
DOOR SEALS

3.
4.

DOOR LATCH MECHANISMS
SEAT TRACK ROLLERS, STOP PINS AND REAR SEAT
LEG RETAINER (CLIP AND CAM)

LUBRICANT
MIL-L-7870
FLUOROCARBON
RELEASE
AGENT DRY LUBRICANT
MS-122
MIL-L-7 870

AERO LUBRIPLATE
OR
MAG-1

FREQUENCY
100 HRS
50 HRS
500 HRS
100 HRS

1744

SPECIAL INSTRUCTIONS
Apply fluorocarbon dry lubricant to door seals at least once a
month to prevent the seal from sticking, and improve sealing
characteristics.

Figure 2-51. Lubrication Chart (Cabin Door, BaggageDoor and Seat)

Reissued:1/15/81

HANDLING AND SERVICING

1FI

0

0
ENGINE
SUMP

FILTERS

0
U
,
A

0

8

a

PIPER CHEROKEE SERVICE MANUAL

COMPONENT
1.

DIAPHRAGM

2.

BACK-UP EXTENDER LINKS AND CONTROL
PIVOT POINTS
BACK-UP EXTENDER SPRING ATTACHMENT
FUEL SELECTOR
LINKAGE
FUEL SELECTOR VALVE COVER PLATE

3.
4.
5.

6.

ACTUATING

SHAFT

LUBRICANT

AND BUSHING

RODCONTACT

FREQUENCY

MIL-L-7870 ABOVE
20 F
MIL-C-21567 BELOW
20 F

100 HRS

ARM
MIL-L-7870
MIL-L-7870
MIL-L-7870
FLUOROCARBON
RELEASE
AGENT DRY LUBRICANT
MS-122

POINTS

AERO LUBRIPLATE

POINTS

A103

OR

MAG-1

100 HRS
100 HRS
100 HRS
100 HRS
100 HRS

1673

PA-28R-180 & 200

PA-28-235

5

SPECIAL INSTRUCTIONS
1.
2.

Diaphragm
shaft
and bushing
- soft film silicon
compound
(MIL-C-21567)
Is recommended
for use
when operating at temperatures
below 200 F.
Fuel selector valve - Lubricate
area where detent ball
moves across cover plate (on external detent
valves
only).

Figure 2-53. Lubrication Chart (Back-UpExtender and Fuel Selector)
Reissued:1/15/81

1F3

HANDLING AND SERVICING

PIPER CHEROKEE SERVICE MANUAL

LUBRICANT

COMPONENT
CONDENSER
CONDENSER

1.
2.

100 HRS

MIL-L-7870
MIL-G-23827

HINGE AND ACTUATORS
TRANSMISSION
DOOR ACTUATING

FREQUENCY
500 HRS

1778

SPECIAL INSTRUCTIONS
Transmission to be 1/2 full of grease. Apply grease during
assembly and lubricate transmission ball nut and screw with
MIL-G-23827 grease.

Figure 2-54. Lubrication Chart (Air Conditioning Condenser)
Reissued: 1/15/81

HANDLING AND SERVICING

1F4

1F5
INTENTIONALLY LEFT BLANK

PIPER CHEROKEE SERVICE MANUAL

SECTIONm
INSPECTION
Aerofiche
Grid No.
3-1
3-2
3-3

I

Introduction ............................................................................................... 1F7
Recommended Lubricants...................................................................
F7
Inspection Periods ..................................................................................... 1F7
3-4
Inspection Requirements ................................................... 1f7
3-5
Preflight Check..................................................................1F8
3-6
Overlimits Inspection ........................................................ 1F9
3-7
Special Inspections...........................................................1F9
3-8
Programmed Maintenance ...............................................1F9
3-9
Inspection of Exhaust System ......... . ....................... 1F9
3-10
Field Check of PA-28R-180, -200 Muffler Assembly ...... F13
3-11
Inspection of Control W heels 1F15..................................
3-1 la
Elevator Control Cable Inspection .................................... IF16
3-12
Inspection of Flap Control Cable Attachment Bolt........... F16
3-13
Inspection of Induction Air Inlet Duct and Alternate
Heat Duct ................................................................. F17
3-13a
Inspection of Seals at Landing Light on Air Filter
Retaining Plate ........................................................1F17
3-14
Inspection of Main Landing Gear Torque Links ............... 1F17

Interim Revision: February 15, 1995

1F6

1F15

PIPER CHEROKEE SERVICE MANUAL

SECTION III
INSPECTION

3-1. INTRODUCTION. This section provides instructions for conducting inspections.
These inspections are described in paragraphs 34 and 3-5. Repair or replacement
instructions for those components found to be unserviceable at inspection may be found in
the section covering the applicable aircraft system.
CAUTION
When working on engines, ground the magneto primary
circuit before performing any operation.

3-2. RECOMMENDED LUBRICANTS. Refer to Recommended Lubricants. Section II for
Lubrication Servicing Instructions.

3-3. INSPECTION PERIODS.

3-4. INSPECTION REQUIREMENTS. Required inspection procedures are listed in Table
1ll-1 (PA-28-140; PA-28-150, -160. -180: PA-28-235) or ll-11 (PA-28R). The inspection
procedure is broken down into nine major groups which are Propeller. Engine. Cabin,
Fuselage and Empennage. Wing. Landing Gear, Float Group. Operational Inspection and
General. The first column in each group lists the inspection or procedure to be performed. The
second column is divided into four columns indicating the required inspection intervals of
50 hours. 100 hours. 500 hours. and 1000 hours. Each inspection or operation is required at
each of the inspection intervals as indicated by a circle (O). If an item is not entirely accessible
or must be removed. refer to the applicable section of this manual for instructions on how to
gain access to remove the item. When performing inspections, use forms furnished by the Piper
Factory Service Department. available through Piper Dealers or Distributors.

Reissued: 1/15/81

1F7

INSPECTION

PIPER CHEROKEE SERVICE MANUAL

NOTE
In addition to inspection intervals required in Table III-I or
III-II, preflight check must be performed as described in
Paragraph3-5.
3-5. PREFLIGHT CHECK. The airplane must be given a thorough preflight and
walk-around check. The pilot and/or mechanic must include the preflight check as a normal
procedure necessary for the safe operation of the aircraft. Refer to the Pilot's Operating
Manual for a listing of items that must be checked.

THIS SPACEINTENTIONALLYLEFT BLANK

Reissued: 1/15/81

INSPECTION
INSPECTION

1F8

PIPER CHEROKEE SERVICE MANUAL

3-6. OVERLIMITS INSPECTION. If the airplane has been operated so that any of its
components have exceeded their maximum operational limits, check with the appropriate
manufacturer.

3-7. SPECIAL INSPECTIONS.The special inspections given in the followingparagraphs,
supplement the scheduled inspections as outlined in the Inspection Report, Table III-I or
III-II, to include inspection of items which are required to be examined at intervals not
compatible with airframe operating time or airframe inspection intervals. Typical of this
type are:
a. Inspection is required because of special conditions or incidents that arise, and
because of these conditions or incidents, an immediate inspection would be required to
insure further safe flight.
b. Inspection of airframe or components on a calendar basis. This type of inspection
could often be accomplishedduring the nearest scheduled inspection.
c. Specific definitive inspection on engines based strictly upon engine operating time.
d. Those inspections not completely covered in other sections of this manual, but
outlined in the Inspection Report and must be explainedin more detail to givea clearer and
complete inspection.

3-8. PROGRAMMEDMAINTENANCE.The programmed maintenance was designed to
permit the utilization of the aircraft, by scheduling inspectionsthrough the use of a planned
inspection schedule. ProgrammedMaintenance schedulesare availablefrom ServiceSales.

3-9. INSPECTION OF EXHAUST SYSTEM. (Refer to Figure 3-1 thru 3-3.) The entire
exhaust system, including heat exchange shroud, muffler, muffler baffles, stacks and all
exhaust connections must be rigidly inspected at each 100 hour inspection. The possibility
of exhaust system failure increases with use. It is recommended that the system be checked
more carefully as the number of hours increase, therefore inspection at the 700 hour period,
that the exhaust system has been in use, would be more critical than one in the 100 hour
period. The system should also be checked carefully before winter operation when the cabin
heat will be in use.

NOTE
It is recommended that all PA-28 airplanes be fitted with a
new muffler at or near the 1000 hour period of which the
muffler has been in use.

Reissued: 1/15/81

INSPECTION

1F9

PIPER CHEROKEE SERVICE MANUAL

A950

INSPECT
FOR
CRACKS
INTHESE
AREAS

INSPECT
FOR
CRACKS
INTHIS
AREA

Figure 3-1.

Typical Muffler Fatigue Areas

Removal of the tail pipe and stacks is required for inspectionof the muffler
baffle. Remove or loosen all exhaust shields, carburetor and cabin heat muffs,
shrouds, heat blankets, etc., as required to permit inspection of the complete
system. Perform the necessary cleaning operations and inspect all external surfaces for dents, cracks and missing parts. Pay particular attention to welds,
clamps, supports and support attachment lugs, slip joints, stack flanges and
gaskets. Inspect internal baffle or diffusers. Any cracks, warpage or severe
oxidation are cause for replacement of the muffler.
If any component is inaccessible for a thorough visual inspection, accomplish one of the following:
a. Accomplish a submerged pressure check of the muffler and exhaust stack
at 2 psi air pressure.
b. Conduct a ground test using a carbon monoxide indicator by heading the
airplane into the wind, warming the engine on the ground, advancing the throttle
to full static RPM with cabin heat valves open, and taking readings of the heated
airstream inside the cabin at each outlet (including rear seat heat outlet, if installed). Appropriate sampling procedures applicable to the particular indicator
must be followed. If carbon monoxide concentration exceeds .005 percent or if
a dangerour reading is obtained on an indicator not calibrated in percentages,
the muffler must be replaced.

Reissued:1/15/81

INSPECTION

1FlO

PIPER CHEROKEE SERVICE MANUAL

965

PA-28-140;PA-28-150,.160, -180,SERIAL
NOS.28-1 TO 28-1760INCL.

981

ALL WELDS AS
INDICATEDBY ARROW

PA-28-150,.160,SERIALNOS.28-1761TO
28-4377INCL.
PA-28-180,SERIALNOS.28-1761ANDUP.

Figure 3-2.

Exhaust System Inspection Points

INSPECTION

Reissued: 1/15/81

1Fll

PIPER CHEROKEE SERVICE MANUAL

968

ALL WELDS AS INDICATED
BY ARROW

PA-28-235

1718

OUTER

INNER BAFFLE

ALL WELDS AS INDICATEDBY ARROW

PA-28R

Figure 3-3

Exhaust System Inspection Points

INSPECTION

Reissued:1/15/81

1F12

PIPER CHEROKEE SERVICE MANUAL

3-10. FIELD CHECK OF PA-28R-180 and -28R-200 MUFFLER ASSEMBLIES. (Refer
to Figure 3-4.)
a. Remove end clips.
b. Check for any movement between the heater muff end plates and the muffler pipes in
the directions shown on Figure 3-4. If there is no movement, the muffler assembly is acceptable.
c. If there is any movement,remove the muffler assemblyand inspect all parts, especially for abnormal wear on muffler shroud. Rework the end plates to give a .03" min. gap after
assembly.
d. Prior to reassembly, the two top screw holes in the upper shroud assembly should be
slotted as necessary to allow the screwsto be installed without causing any deformations of
the skin.
e. Install, but do not tighten, the two screws which hold the lower shroud assembly in
place.
f. Install the end strap clamps and torque them from 25 to 30 inch-pounds before installing the two top screws which hold the top shroud assembly in place.
g. Tighten the two lower screws and then the two upper screws.
h. Check the muffler for tightness after assembly.

Reissued: 1/15/81

Reissued: 1/15/81

1F13

INSPECTION

PIPER CHEROKEE SERVICE MANUAL

3030

TOP SCREWS(ADDAFTER
STRAPCLAMPSARE TORQUED)

CHECKFORANY MOVEMENT
OFTHEENDPLATESIN
THESEDIRECTIONS

.03" MINIMUMGAP
BETWEENENDPLATES
AFTERASSEMBLY

1. END PLATES
2. END CLIPS
3. END

Figure 3-4. Exhaust System Installation, PA-28R-180, -200

Reissued: 1/15/81

INSPECTION

1F14

PIPER CHEROKEE SERVICE MANUAL

913

Figure 3-5. Control Wheel Inspection Points
3-11. INSPECTIONOF CONTROLWHEELS. (Refer to Figure 3-5.)
a. This inspection should be accomplished at the next 100 hour or annual inspection
and repeated at each 100 hour or annual inspection thereafter.
b. It is required to detect and replace any cracked control wheels.
c. Inspect the front, bottom and back of the control wheels using an ordinary (3x)
magnifyingglass and light.
NOTE
Do not confuse any surface irregularitiesor mold marks with
actual cracks. (Refer to Figure 3-5.)
CAUTION
No solvents or dye penetrant should be used to perform this
inspection.
d. Any control wheel assemblies which are found defective should be replaced
immediately. Refer to PA-28 Parts Catalog for applicable part numbers.

Reissued: 1/15/81

INSPECTION

1F15

PIPER CHEROKEE SERVICE MANUAL

3-1la. ELEVATOR CONTROL CABLE INSPECTION. (Refer to Paragraph 4-57a.)
Special care should be taken to inspect elevator control cables beneath aft baggage compartment floor. Add access panels per instructions in Paragraphs 4-57a and 4-79 to ease this inspection.

MOUNTINGBRACKET

I
EMERGENCYGEAR LEVER
BUSHING
(SEE LATESTREVISIONOF
PIPERSERVICEBULLETIN965)

INSPECTTHIS BOLT
AT EACH100 HOURS

Figure 3-6. Flap Control Cable Attachment Bolt Inspection
3-12. INSPECTION OF FLAP CONTROL CABLE ATTACHMENT BOLT. (Refer to
Figure 3-6.)
a. This inspection should be accomplished at each 100 hours time in service.
b. The inspection is required to detect any possible wear and replacement of
attachment bolt, should evidence of wear be detected.
c. Remove the royalite flap or flap/trim cover.
d. On aircraft having the flap handle only, proceed as follows:
1. Remove flap handle mounting bracket attachment bolts.
2. Raise flap handle and bracket assembly to gain access to the control cable
attachment bolt.
e. On aircraft having the flap handle and trim wheel mounted together, proceed as
follows:
1. Loosen the trim wheel attachment bolt.
2. Remove the trim wheel bracket attachment bolts and remove bracket from top
of tunnel.
3. Remove flap handle mounting bracket attachment bolts and raise handle and
bracket assembly to gain access to control cable attachment bolt.
f. Remove and inspect cable attachment bolt for possible wear. Should wear be
detected, replace bolt with new AN23-11 clevis bolt.
g. Reinstall all parts that were removed and make appropriate log book entry.

Interim Revision: February 15, 1995

INSPECTION

1F16

PIPER CHEROKEE SERVICE MANUAL
3-13. INSPECTION OF INDUCTION AIR INLET DUCT AND ALTERNATEHEAT DUCT.
This inspection should be accomplished at the next 25 hours of operation and at each subsequent
100 hours of operation thereafter. This inspection is a visual inspection of the external surface of
the subject ducts and does not require duct removal and replacement to accomplish the inspection.
Inspect the ducts for evidence of deterioration as follows:
a. Inspect the external surface of the ducts for loose or broken strings.
b. Inspect the ducts for loose or displaced supporting wire.
c. Inspect the ducts for signs of wear or perforation.
Should any of the above conditions exist, remove and replace the affected duct or ducts prior to
the next flight. Refer to PA-28 Cherokee Parts Catalog for replacement part numbers.
3-13a. INSPECTION OF SEALS AT LANDING LIGHT ON AIR FILTER RETAINING PLATE.
As part of the inlet air, the landing light is retained at the center of the air filter by a retaining plate.
Unfiltered air is blocked by seals around the landing light and retaining ring. Piper issued Service
Bulletin 975 (or latest revision) which requires inspection of the seals and installation of a new support bracket and new seals. This section requires accomplishment of Piper Service Bulletin 975 (or
latest revision) and an initial inspection of landing light seals, with a recurring inspection annually,
or at each 100 hours. Seals should be inspected for aging, weather, checking, cracks, or looseness.
Replace as required.
3-14. INSPECTION OF MAIN LANDING GEAR TORQUE LINKS. (Refer to Figure 3-7.)
This inspection should be accomplished within the next 100 hours and at intervals not to exceed
500 hours of operation from previous inspection.
The main landing gear torque links should be inspected for possible cracks which may appear
on the areas referenced in Figure 3-7. These cracks may form just behind the large boss which
attaches to the strut or to the wheel, and in the center of the link progressing toward the edge. The
following steps should be used to make this inspection:
a. Remove paint from the area to be inspected, using acetone, MEK, or any suitable commercial paint remover which does not contain wax.
b. Allow the cleaned part to dry thoroughly.
c. If cracks do not readily appear, inspect by one of the following methods:
1. 10X magnifying glass.
2. Dye check or other penetrant inspection.
d. Should cracks be detected, replace defective torque links prior to further flight.
e. If no cracks appear, make proper log book entry and return aircraft to service.
INSPECTFOR CRACKS
(Referto the latestrevision
of PiperServiceLetter760.)
CHECK FOR
POSSIBLECRACKS
ON BOTHSIDES
OF TORQUELINKS.

Figure 3-7. Inspection of Main Landing Gear Torque Links
Interim Revision: February 15, 1995

INSPECTION

1F17

PIPER CHEROKEE SERVICE MANUAL
TABLE III-I. INSPECTION REPORT
PA-28-140; PA-28-150, -160, -180; PA-28-235
NOTE
Perform inspection or operation at each of the inspection intervals as indicated by a circle (O).
Nature of Inspection

Inspection time (hrs)
50 100 500 1000

A. PROPELLER GROUP
1. Inspect spinner and back plate. .....................................................................................
2. Inspect blades for nicks and cracks ...............................................................................
3. Inspect for grease and oil leaks. ....................................................................................
4. Lubricate propeller. (Refer to Service Manual Section VIII of VIIIA) .........................
5. Inspect spinner mounting brackets ................................................................................
6. Inspect propeller mounting bolts and safety. (Check torque if safety is broken)..........
7. Inspect hub parts for cracks and corrosion.....................................................................
8. Rotate blades of constant speed propeller and check for tightness in hub pilot tube.
9. Remove constant speed propeller; remove sludge from propeller and crankshaft.
10. Inspect complete propeller and spinner assembly for security, chafing, cracks,
deterioration, wear, and correct installation.............................................................
11. Overhaul propeller. (See Note 21)..................................................................................

0
0
0
0

0
0
0
0
0
0
0
0

0
0
0
0
0
0
0
0
0

0
0
0
0
0
0
0
0
0

0

0

0

B. ENGINE GROUP.
Read Note 5 prior to completing this inspection group.
NOTE:
CAUTION: Ground Magneto Primary Circuit before working on engine.
1. Remove engine cowl and inspect for damage (See Note 19)......................................... 0
2. Clean and inspect cowling for cracks, distortion, and loose or missing fasteners

(See the latest revisionof Piper S/L 796) (See Note 23) ...............................................
3. Drain oil sump. (See Note 6)......................................................................................... 0
4. Clean suction oil strainer at oil change. (Inspect strainer for foreign particles) ........... 0
5. Clean pressure oil strainer or change full flow (cartridge type) oil filter
element. (Inspect strainer or element for foreign particles).................................... 0
6. Inspect oil temperature sender unit for leaks and security ............................................
7. Inspect oil lines and fitting for leaks, security, chafing, dents and cracks.
(See Note 8).............................................................................................................
8. Clean and inspect oil radiator cooling fins.....................................................................
9. Remove and flush oil radiator. .......................................................................................
10. Fill engine with oil per lubrication chart in Service Manual..........................................
11. Clean engine...................................................................................................................
CAUTION: Do not contaminate the vacuum pump with cleaning fluid.
(Ref: Latest revision of Lycoming Service Instruction No. 1221.)

Interim Revision: February 15, 1995

0

00
0
0
0

00
00
00

0
0

00
00
0
0
0
0
0

INSPECTION

1F18

PIPER CHEROKEE SERVICE MANUAL
TABLE 11l-1. INSPECTION REPORT (cont)
PA-28-140; PA-28-150, -160, -180; PA-28-235
Inspection Time (hrs)
Nature of Inspection
100

500

1000

O
O
O

0
0
0

0
0
0

O

0

0

O

0

0

O
O
O

0
0
0

0
0
0

O

0
0

0
0

0
0
0
0
0
0

O
O
O
O
O
O
O

0
0
0
0
0
O
O

0
0
0
0
0
O
O

0

O

0

O

0

O

O

0

0

O
O

O
O

O
0

O

O

0

O

O

0

0

0

0

50
B. ENGINE GROUP (cont.)
12. Inspect condition of spark plugs (Clean and adjust gap as required, adjust
per the latest revision of Lycoming Service Instruction No. 1042)
(See N ote 15) ...............................................
NOTE:
If fouling of spark plugs has been apparent, rotate bottom plugs
to upper plugs.
13. Inspect spark plug cable leads and ceramics for corrosion and deposits ...
14. Check cylinder compression (Ref: AC 43.13-lA) .......................
15. Inspect cylinders for cracked or broken fins ...........................
16. Inspect rocker box covers for evidence of oil leaks. If found, replace
gasket; torque cover screws 50 inch-pounds (See Note 13) ...............
NOTE:
Lycoming requires a Valve Inspection be made at completion of
every 400 hours of operation. (See Note 12)
17. Inspect ignition harness and insulators (high tension leakage and
continuity) ........................................................
18. Inspect magneto points for condition and proper clearance (Refer to
Service Manual Section VIII or VIIIA) ..............................
19. Inspect magneto for oil leakage ......................................
20. Inspect breaker felts for proper lubrication ............................
21. Inspect distributor block for cracks, burned areas or corrosion and
height of contact springs ...........................................
22. Check magnetos to engine timing ....................................
23. Overhaul or replace magnetos (See Note 7)............................
24. Remove air filter and tap gently to remove dirt particles (Replace
as required, refer to latest revision of Piper Service Bulletin 975, as applicable.).
25. Drain carburetor and clean inlet line fuel'strainer ......................
26. Inspect condition of carburetor heat air door and box (See Note 14) .....
27. Inspect vent lines for evidence of fuel or oil seepage ....................
28. Inspect intake seals for leaks and clamps for tightness ..................
29. Inspect all air inlet duct hoses (Replace as required) ....................
30. Inspect condition of flexible fuel lines ................................
31. Replace flexible fuel lines (See Note 7) ................................
32. Inspect fuel system for leaks (See Note 16) ............................
33. Clean screens in electric fuel pump(s) and check operation
(engine and electric) ................................................
34. Overhaul or replace fuel pumps (engine driven) (See Note 7) ...........
35. Remove and clean fuel filter bowl and screen (Clean at least every
90 days) (PA-28-140, -150, -160, -180) ................................
36. Inspect vacuum pump and lines .....................................
37. Overhaul or replace vacuum pump (See Note 7) .......................
38. Inspect throttle, carburetor heat, mixture and propeller governor controls
for security, travel and operating conditions (Refer to the latest revision
of Piper Service Bulletin No. 448 and Service Letter No. 747) .......
39. Inspect exhaust stacks, connections and gaskets (Refer to Service
Manual, Section III) (Replace gaskets as required) .....................
40. Inspect muffler, heat exchange and baffles (Refer to Service Manual,
Section III) .......................................................

Interim Revision:February 15, 1995

1F19

0

INSPECTION

PIPER CHEROKEE SERVICE MANUAL
TABLE III-I. INSPECTION REPORT (cont)
PA-28-140; PA-28-150, -160, -180; PA-28-235
Nature of Inspection

Inspection time (hrs)

50 100 500 1000
A. ENGINE GROUP (cont.)
41. Check recommended time for replacement of muffler per Service Manual,
Section III ......................................................................................................................
0
O 0
42. Inspect breather tube for obstructions and security .......................................................
O O
O
43. Inspect crankcase for cracks, leaks, and security of seam bolts ....................................
O O O
44. Inspect engine mounts for cracks and loose mountings.................................................
O O O
45. Inspect all engine baffles ..............................................................................................
O O O
46. Inspect all wiring connected to the engine or accessories............................................. O O O
O
47. Inspect rubber engine mount bushings for deterioration (Replace as required) ............
O O O
48. Inspect fire wall seals .....................................................................................................
O O O
49. Inspect condition and tension of alternator drive belt (Refer to Service Manual
O O
Section XI) ....................................................................................................................
O O O
50. Lubricate alternator idler pulley (if installed) per lubrication chart in Service Manual
O O O
Section II .......................................................................................................................
O O o
51. Inspect condition of alternator and starter .....................................................................
O O O
52. Inspect security of alternator mounting .........................................................................
O O O
53 Check air conditioning compressor oil level (See Note 9) ............................................
54. Inspect condition of compressor belt and tension (Refer to Service Manual Section
XIV) ..............................................................................................................................
O O O
55. Inspect compressor clutch security and wiring (See Note 10) ......................................
O O O
56. Inspect security of compressor mounting ......................................................................
O O O
57. Check fluid in brake reservoir (Fill as required) ........................................................... O O O
O
58. Lubricate all controls (Refer to Service Manual Section II) .........................................
O O O
59. Overhaul or replace propeller governor (See Note 7) ....................................................
60. Complete overhaul of engine or replace with factory rebuilt (See Note 7) ..................
61. Reinstall engine cowl .................................................................................................... O O
O O
C.
1.
2.
3.
4.
5.
6.
7.
8.
9.

CABIN GROUP
Inspect cabin entrance, door and windows for damage, operation and security............
O O
Inspect upholstery for tears ........................................ ...................................................
O
Inspect seats, seat belts, security brackets and bolts ......................................................
O
Check trim operation (See Note 17)......................................
..................................
O
Inspect rudder pedals......................................................................................................
O
Inspect parking brake and brake handle for operation and cylinder leaks. ....................
O
Inspect control wheels, column, pulleys and cables ......................................................
O
Inspect flap control cable attachment bolt......................................................................
O
Inspect landing, navigation, cabin and instrument lights. (See latest revision of Piper
Service Bulletin 975 if the landing light is located in the air filter)...............................
O
O
10. Inspect instruments, lines and attachments (See the latest revision of Piper Service
Bulletin No. 582) ...........................................................................................................
O
11. Inspect gyro operated instruments and electric turn and bank (Overhaul or replace
as required)................................................. ........................................ ............................ O
12. Replace filters on gyro horizon and directional gyro or replace central air filter .........
O
13. Clean or replace vacuum regulator filter .......................................................................
O O

Interim Revision: February 15, 1995

O
O0
O
O
O
O
O

O

O

O

O

O
O

O
O

INSPECTION

1F20

O

O
O
O
O
O

O

CHEROKEESERVICE MANUAL
TABLEIII-I. INSPECTIONREPORT (cont)
PA-28-140;PA-28-150,-160,-180; PA-28-235
Inspection Time (hrs)
Nature of Inspection
50

100 500 1000

C. CABIN GROUP (cont)
14. Inspect altimeter (Calibrate altimeter system in accordance with
FAR 91.170 if appropriate) .........................................
15. Check operation of fuel selector valve (See Note 18)....................
16. Check operation of fuel drain (PA-28-235) ............................
17. Inspect condition of heater controls and ducts .........................
18. Inspect condition and operation of air vents ...........................
19. Inspect condition of air conditioning ducts ............................
20. Remove and clean air conditioning evaporator filter ....................

O
O
O

0
0
0

0
0
0

O
o
O
O

0
0
0
0

0
0
0
0

O
O

O
O

O
O

O

O
O
O
O
o

0
0
0
0
0

0
0
0
0
0

0

O

0

0

0

O
o
O

0
0
0

0
0
0

0

o

0

0

0

o
O

0
0

0
0

o
o

0
0

0
0

0
0
0
0
O

O
O
O

0
0
O

0

0

0

O
0

0

0

D. FUSELAGE AND EMPENNAGE GROUP
1. Remove inspection plates and panels .................................
2. Inspect baggage door, latch and hinges for operation and security ........
3. Inspect battery, box and cables (Inspect at least every 30 days. Flush
box as required and fill battery per instructions on box) ................
4. Inspect electronic installation ........................................
5. Inspect bulkheads and stringers for damage ...........................
6. Inspect antenna mounts and electric wiring............................
7. Inspect air conditioning system for freon leaks .........................
8. Check freon level in sight gauge of receiver-dehydrator (Refer to
Service Manual, Section XIV........................................
9. Inspect air conditioning condenser air scoop rigging (Refer to Service
Manual, Section XIV) ..............................................
10. Inspect fuel lines, valves, and gauges for damage and operation ..........
11. Clean screens in fuel pumps (PA-28-235only) .........................
12. Inspect fuel valve drain lever cover for security and door for proper
operation (PA-28-235 only) .........................................
13. Remove, drain and clean fuel strainer bowl and screen located in bottom
of selector valve (Drain and clean at least every 90 days) (PA-28-235).....
14. Inspect security of all lines ..........................................
15. Inspect vertical fin and rudder surfaces for damage .....................
16. Inspect rudder hinges, horn and attachments for damage and operation ...
17. Inspect rudder control stop to insure stop has not loosened and
locknut is tight ....................................................
18. Inspect vertical fin attachments ......................................
19. Inspect rudder hinge bolts for excess wear (Replace as required) .........
20. Inspect stabilator surfaces for damage ................................
21. Inspect stabilator, tab hinges, horn and attachments for damage and
operation .........................................................
22. Inspect stabilator control stops to insure stop has not loosened and
locknut is tight ....................................................
23. Inspect stabilator attachments (see latest Piper ServiceBulletin856) ......
Revised: 8/3/81
Interim Revision: 5/6/87

O

INSPECTION

IF21

PIPER CHEROKEE SERVICE MANUAL
TABLE III-I. INSPECTION REPORT (cont)
PA-28-140; PA-28-150, -160, -180; PA-28-235
Nature of Inspection
D. FUSELAGE AND EMPENNAGE GROUP (cont.)
24. Inspect stabilator and tab hinge bolts and bearings for excess wear (Replace as
required) ........................................................................................................................
25. Inspect stabilator trim mechanism..................................................................................
26. Inspect aileron, rudder, stabilator, stabilator trim cables, turbuckles, guides and
pulleys for safety, damage and operation (See Note 24)................................................
27. Check all cable tensions (use tensiometer, see Note 20)................................................
28. Clean and lubricate stabilator trim drum screw ............................................................
29. Clean and lubricate all exterior needle bearings ...........................................................
30. Lubricate per lubrication chart in Service Manual.........................................................
31. Inspect rotating beacon for security and operation .......................................................
32. Inspect security of Autopilot bridle cable clamps (See Note 11) ..................................
33. Inspect all control cables, air ducts, electrical leads, lines, radio antenna leads and
attaching parts for security, routing, chafing, deterioration, wear and correct
installation .....................................................................................................................
34. Inspect E.L.T. installation and condition of battery and antenna (See the latest
revision of Piper S/L No. 820) .......................................................................................
35. Reinstall inspection plates and panels............................................................................

Inspection time (hrs)
50 100 5001000

O

0
0
0
0
0

0
0
0
0
0
0

O
0
0

O
0
0

0
0
0
0
0
0
O
O
0
0

0

0

0

0
0

0
0

0
0

0
0
O

0
0
O

0
0
0
0
0
0
0
O
O

0
0
0
0
0
0
0
O
O

0
0

0
0

E. WING GROUP
1. Remove inspection plates and fairings ..........................................................................
2. Inspect surfaces and tips for damage, loose rivets, and condition of walk-way ............
3. Inspect aileron hinges and attachments .......................................................................
4. Inspect aileron control stops to insure stop has not loosened and lock nut is tight........
5. Inspect aileron cables, pulleys and bellcranks for damage and operation .....................
6. Inspect flaps and attachments for damage and operation ..............................................
7. Inspect condition of bolts used with hinges (Replace as required)................................
8. Lubricate per lubrication chart in Service Manual (Section II) ....................................
9. Inspect wing attachment bolts and brackets (See Note 18) ...........................................
10. Inspect fuel tanks and lines for leaks, water and contamination (See Note 18).............
1 . Fuel tanks marked for capacity .....................................................................................
12. Fuel tanks marked for minimum octane rating ..............................................................
13. Inspect fuel cell vents (See Note 18) .............................................................................
14. Inspect all control cables, air ducts. electrical leads, lines and attaching parts for
security, routing, chafing, deterioration, wear and correct installation ..........................
15. Reinstall inspection plates and fairings ..........................................................................

Interim Revision: February 15, 1995

O
O
o
O
O
O
O
0 0
O
O
O
O
O
0
0

INSPECTION

1F22

`
PIPER CHEROKEE SERVICE MANUAL

TABLE 1ll-1. INSPECTION REPORT (cont)
PA-28-140: PA-28-150, -160. -180; PA-28-235
Inspection Time (hrs)
Nature of Inspection
50

100

500

1000

O

O
O
O
O
O

0
0
0
0
0

0
0
0
0
0

F. LANDING GEAR GROUP
1. Inspect oleo struts for proper extension per Service Manual (Check
fluid level as required) ..............................................
2. Inspect nose gear steering control and travel ...........................
3. Inspect wheels for alignment ........................................
4. Put airplane on jacks ...............................................
5. Inspect tires for cuts. uneven or excessive wear and slippage .............
6. Remove wheels, clean, check and repack bearings ......................
7. Inspect wheels for cracks, corrosion and broken bolts...................
8. Check tire pressure per Service Manual ...............................
9. Inspect brake lining and disc for condition and wear ...................
10. Inspect brake backing plates for condition and wear ....................
11. Inspect brake lines .................................................
.........................................
12. Inspect shimmy dampener
13. Inspect gear forks for damage .......................................
14. Inspect oleo struts for fluid leaks and scoring ..........................
15. Inspect gear struts, attachments, torque links, and bolts for condition
and security .......................................................
16. Inspect all hydraulic lines, electrical leads. and attaching parts for
security, routing, chafing. deterioration. wear and correct
installation ........................................................
17. Lubricate per lubrication chart in Service Manual......................
18. Remove airplane from jacks .........................................

O

O

O

0

0

O
O
O
O

0
0
0
0

0
0
0
0

O

O

0

O
O
O

0
0
0

0
0
0

O

0

0

O
O
O

0
0
0

0
0
0

O
O
O

0
0
0

0
0
0

O

0

0

O

O

O

0

0

O

0
0
0
0
0
0

0
0
0
0
0
0

O
O
O
O
O
O

G. FLOAT GROUP
1. Inspect float attachment fittings ......................
2. Inspect floats for damage ...........................
3. Inspect pulleys and cables...........................
H. OPERATIONAL INSPECTION
1. Check fuel pump and fuel tank selector (For PA-28-235. See the latest
revision of Piper Service Bulletin No. 519) ............................
.................
2. Check fuel quantity, pressure and flow readings ......
3. Check oil pressure and temperature ..................................
4. Check alternator output ............................................
..................
5. Check manifold pressure ...................
6. Check alternate air.................................................
7. Check parking brake ...............................................
8. Check vacuum gauge ...............................................
9. Check gyros for noise and roughness .................................
10. Check cabin heater operation........................................

Reissued: 1 15 81

1F23

1F23

0
0
0
0
0
0
0
0
0
0

O

0

INSPECTION

PIPER CHEROKEE SERVICE MANUAL

TABLE 111-I. INSPECTION REPORT (cont)
PA-28-140: PA-28-150. -160. -180: PA-28-235
Inspection Time (hrs)
Nature of Inspection
50

100

500

1000

0
0

O
O

0
0

0
0

0
0
0
0
0

O
O
O
O
O

0
0
O
0
0

0
0
O
O
0

0
0
0

O
O
O

0
0
0

0
0
0

O
O
O
O
O

O
O
O
O
O

O
O
O
O
O

O
C
O
O
O

H. OPERATIONAL INSPECTION (cont)
II. Check magneto switch operation ..............
.......................
12. Check magneto RPM
variation
.....................................
13. Check throttle and mixture operation (See the latest revision of
Piper Ser ice Bulletin No. 448) ......................................
14. Check propeller smoothness .........................................
15. Check propeller o\ ernor action .....................................
16. Check engine idle ..................................................
17. Check electronic equipment operation ................................
18. Check operation of Autopilot including automatic pitch trim. and Manual
Electric Trim (See Note 22) .........................................
19. Check air conditioner compressor clutch operation .....................
20. Check air conditioner condenser scoop operation ......................

O

I. GENERAL
1. Aircraft conforms to FAA Specification ..............................
2. All latest FAA Airworthiness Directives complied with .................
3. All latest Manufacturer's Service Bulletins and Letters complied with .....
4.

Check for proper Flight Manual .....................................

5. Aircraft papers in proper order ......................................

Revised: 10 3 83

1F24
1F24

INSPECTION

CHEROKEE SERVICE MANUAL
TABLE III-I. INSPECTION REPORT (cont)
PA-28-140; PA-28-150, -160, -180; PA-28-235
NOTES:

1. Referto the last card of the Piper Parts Price List- Aerofiche,for a checklistof current revisiondates
to Piper Inspection Reports and Manuals.
2. All inspectionsor operations are required at each of the inspectionintervals as indicatedby a (O).
Both the annual and 100 hour inspections are complete inspections of the airplane, identical in
scope, while both the 500 and 1000 hour inspections are extensions of the annual or 100 hour
inspection, which require a more detailed examination of the airplane,and overhaulor replacement
of some major components. Inspectionsmust be accomplishedby persons authorized by the FAA.
3. Piper Service Bulletins are of special importance and Piper considers compliance mandatory.
4. Piper Service Letters are product improvements and service hints pertaining to servicing the
airplane and should be given careful attention.
5. Inspectionsgivenfor the power plant are based on the engine manufacturer'soperator's manual for
the particular airplane. Any changes issued to the engine manufacturer's operator's manual shall
supersede or supplement the inspections outlined in this report.
6. Intervals between oil changescan be increasedas much as 100%on enginesequipped with full flow
cartridge type oil filters, provided the element is replaced each 50 hours of operation and the
specified octane fuel is used. Should fuel other than the specifiedoctane rating for the power plant
be used, refer to latest revision of Lycoming Service Letter No. L185 for additional information and recommended service procedures.
7. Replaceor overhaul as required or at engine overhaul. (For engine overhaul, referto latest revision
of Lycoming Service Letter No. L201.)
8. Replace flexible oil lines as required, but no later than 1000hours of service.
9. The compressor oil level should not be checked unless a freon leak has occurred which requires an
addition of freon to the system.
10. Clean any traces of oil from the clutch surface.
11. Check security and condition of Autopilot servo bridle cables,clamps, and shear pin in accordance
with the latest revision of Piper Service Letter No. 695.
12. At every 400 hours of engine operation, remove the rocker box covers and check for freedom of
valve rockers when valves are closed. Look for evidence of abnormal wear or broken parts in the
area of the valvetips, valve keeper,springsand springseat. If any indicationsare found, the cylinder
and all of its components should be removed (including the piston and connecting rod assembly)
and inspected for further damage. Replace any parts that do not conform with limits shown in the
latest revision for Special Service Publication No. SSP 1776.
13. Check cylinders for evidence of excessive heat indicated by burned paint on the cylinders.
This condition is indicative of internal damage to the cylinder and, if found, its cause must be
determined and corrected before the aircraft is returned to service.
Heavy discoloration and appearance of seepage at the cylinder head and barrel attachment
area is usuallydue to emission of thread lubricant used during assemblyof the barrel at the factory,
or by slightgas leakage which stops after the cylinderhas been in servicefor awhile.This condition
is neither harmful nor detrimental to engine performance and operation. If it can be proven
that leakage exceeds these conditions, the cylinder should be replaced.
14. Check throttle body attaching screwsfor tightness; the correct torque for these screwsis 40 to 50
inch-pounds.
15. When using alternate fuels, refer to the latest revision of Lycoming Service Letter No. L185 for
additional information and recommended service procedures.
16. Replace fuel tank vent line flexibleconnections as required, but no later than 1000hours of service.
17. If airplane has electric trim system refer to the latest revision of Piper S/B556.

Revised: 1/15/86
Interim Revision: 5/6/87

1G1

INSPECTION

PIPER CHEROKEE SERVICE MANUAL

TABLE III-I. INSPECTION REPORT (cont)
PA-28-140; PA-28-150, -160, -180; PA-28-235
NOTES:
18. Refer to and comply with Piper Service Bulletin No. 571 A. Replace flexible fuel tank supply hose at
time of engine overhaul.
19. Refer to the latest revision of Piper Service Bulletin No. 580.
20. Maintain cable tensions specified in Section V of Service Manual.
21. Refer to the latest information for the particular propeller being inspected:
McCauley Service Bulletin No. 137.
Hartzell Service Letter No. 61.
Sensenich Propeller Bulletin No. RBHR-978 or R-14 and AD69-9-3 for PA-28-180 aircraft with
Lycoming 0-360-A3A engines and M76EM Sensenich propellers, built up to and including 1969.
22. Refer to Flight Manual Supplement for preflight and flight check, for intended function in all modes.
23. Inspect Teflon bushing (lower to upper cowling attachment) for condition at each 100 hours. Replace
bushing on condition, but no later than 500 hours time in service. Inspect pin for condition and replace
as necessary.
24. If not already installed, add access panels, see Paragraph 4-57a. Inspect stabilator control cables, see
Paragraph 3-11a.

Interim Revision: February 15, 1995

INSPECTION

1G2

PIPER CHEROKEE SERVICE MANUAL
TABLE III-II. INSPECTION REPORT
PA-28R
NOTE
Perform inspection or operation at each of the inspection intervals as indicated by a circle (O).
Nature of Inspection

Inspection time (hrs)
50 100 500 1000

A. PROPELLER GROUP
1. Inspect spinner and back plate. .....................................................................................
2. Inspect blades for nicks and cracks ...............................................................................
3. Inspect for grease and oil leaks. ...................................................................................
4. Lubricate propeller per lubrication chart in Service Manual (Section II) ......................
5. Inspect spinner mounting brackets.................................................................................
6. Inspect propeller mounting bolts and safety. (Check torque if safety is broken)..........
7. Inspect hub parts for cracks and corrosion.....................................................................
8. Rotate blades of constant speed propeller and check for tightness in hub pilot tube.....
9. Remove constant speed propeller; remove sludge from propeller and crankshaft........
10. Inspect complete propeller and spinner assembly for security, chafing, cracks,
deterioration, wear, and correct installation.............................................................
11. Overhaul propeller. (See Note 22)..................................................................................

O
O
O
O

0
0
0
0
0
0
0
0

00
00
00
00
00
00
00
00
00

O

O

O

B. ENGINE GROUP.
Read Note 5 prior to completing this inspection group.
NOTE:
CAUTION: Ground Magneto Primary Circuit before working on engine.
1. Remove engine cowl and inspect for damage................................................................
2. Clean and inspect cowling for cracks, distortion, and loose or missing fasteners
(See Note 23)..................................................................................................................
3. Drain oil sump. (See Note 6).........................................................................................
4. Clean suction oil strainer at oil change. (Inspect strainer for foreign particles) ...........
5. Clean pressure oil strainer or change full flow (cartridge type) oil filter
element. (Inspect strainer or element for foreign particles)....................................
6. Inspect oil temperature sender unit for leaks and security. ...........................................
7. Inspect oil lines and fitting for leaks, security, chafing, dents and cracks.
(See Note 8) .............................................................................................................
8. Clean and inspect oil radiator cooling fins.....................................................................
9. Remove and flush oil radiator .......................................................................................
10. Fill engine with oil per lubrication chart in Service Manual (Section II) ......................
11. Clean engine ...................................................................................................................
CAUTION: Do not contaminate the vacuum pump with cleaning fluid.
(Ref: Latest revision of Lycoming Service Instruction No. 1221.)

0

0

0

O
O

0
0
0

0
0
0

0
0
0

O

0
0

0
0

0
0

O

0
0

O

0
0

0
0
0
0
O
O
0
0
0
0

O

INSPECTION

Interim Revision: February 15, 1995

1G3

PIPER CHEROKEE SERVICE MANUAL
TABLE III-II. INSPECTION REPORT (cont)
PA-28R
Inspection Time (hrs)

Nature of Inspection
50

100

500

1000

0

0

0

O0
O0
O

0

0
0
0

O

0

0

O

0

0

O
O
O

0
0
0

0
C
O

O

0
0

0
0

O

O

0

0

O
O
O
O
O

O
O
O
O
O
O

0
0
0
0
0
0

O

O
O

0
0

0
0
0
0
0
0
O
0
0

O

O
O

0
0

0
0

O

0

0

0
0

0
0

O
O

B. ENGINE GROUP (cont.)

12. Inspect condition of spark plugs (Clean and adjust gap as required; adjust
per the latest revision of Lycoming Service Instruction No. 1042) .......
NOTE:
If fouling of spark plugs has been apparent, rotate bottom plugs
to upper plugs. (Refer to the latest revisionof Lycoming Service
Instruction No. 1070 for additional information and
recommended service procedures when using alternate fuels.)
13. Inspect spark plug cable leads and ceramics for corrosion and deposits ...
14. Check cylinder compression (Ref: AC 43.13-lA) .......................
15. Inspect cylinders for cracked or broken fins ...........................
16. Inspect rocker box covers for evidence of oil leaks. If found, replace
gasket; torque cover screws 50 inch-pounds (See Note 12) ...............
NOTE:
Lycoming requires a Valve Inspection be made after every
400 hours of operation. (See Note 11)
17. Inspect ignition harness and insulators (high tension leakage and
continuity) ........................................................
18. Inspect magneto points for condition and proper clearance (Refer to
Service Manual) ..................................................
19. Inspect magneto for oil leakage ......................................
20. Inspect breaker felts for proper lubrication ............................
21. Inspect distributor block for cracks, burned areas or corrosion and
height of contact springs ...........................................
22. Check magnetos to engine timing (Refer to Service Manual).............
23. Overhaul or replace magnetos (See Note 7)............................
24. Remove air filter and tap gently to remove dirt particles (Replace
as required) .......................................................
25. Clean fuel injector inlet line screen (Clean injector nozzles as required)
(Clean with acetone only) ...........................................
26. Inspect condition of injector alternate air door and box (See Note 13) ....
27. Inspect vent lines for evidenceof fuel or oil seepage ....................
28. Inspect intake seals for leaks and clamps for tightness ..................
29. Inspect all air inlet duct hoses (Replace as required) ....................
30. Inspect condition of flexible fuel lines ................................
31. Replace flexible fuel lines ...........................................
32. Inspect fuel system for leaks.........................................
33. Inspect fuel pumps for operation (engine driven and electric) ............
34. Overhaul or replace fuel pumps (engine driven and electric) (See Note 7)..
35. Clean gascolator bowl and screens (Clean at least every 90 days) .........
36. Inspect vacuum pump and lines......................................
Overhaul or replace vacuum pump (See Note 7) .......................
38. Inspect throttle, alternate air, mixture and propeller governor controls
for security, travel and operating condition (Refer to the latest revision
of Piper Service Bulletin No. 448 and Service Letter No. 747) .........
39. Inspect exhaust stacks, connections and gaskets (Replace gaskets as
required)..........................................................
40. Inspect muffler, heat exchange and baffles (Refer to the latest
revision of Piper S/B No. 691) ...................................

137.

Revised: 8/3/81

1G4

0

O

INSPECTION

PIPER CHEROKEE SERVICE MANUAL

TABLE III-II. INSPECTION REPORT (cont.)
PA-28 R
Inspection Time (hrs)
Nature of Inspection
50

100

500

1000

O
O
O
O
O

0
0
0
0
0

0
0
0
0
0

O
O

0
0

0
0

O

0

0

O
O
O

0
0
0

0
0
0

O

O

O

O

0

0

O
O

0
0

0
0

O

0

0

0

0

B. ENGINE GROUP (cont)
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.

Inspect breather tube for obstructions and security .....................
Inspect crankcase for cracks, leaks, and security of seam bolts ...........
Inspect engine mounts for cracks and loose mountings ..................
Inspect condition of all engine baffles.................................
Inspect condition of all wiring connected to the engine or accessories .....
Inspect rubber engine mount bushings for deterioration (Replace as
required) .........................................................
Inspect condition of fire wall seals ...................................
Inspect condition and tension of alternator drive belt (Refer to
Service Manual Section XI.) ........................................
Lubricate idler pulley (if installed) per lubrication chart in
Service Manual ...................................................
Inspect condition of alternator and starter .............................
Inspect security of alternator mounting ...............................
Inspect air conditioning compressor oil level (See Note 9) ...............
Inspect condition of compressor belt and tension (Refer to Service
Manual Section XIV.) ..............................................
Inspect compressor clutch security and wiring (See Note 10) .............
Inspect security of compressor mounting ..............................
O
Check fluid in brake reservoir (Fill as required) ........................
Lubricate all controls per lubrication chart in Service Manual (Section 11).
Overhaul or replace propeller governor (See Note 7) (Refer to the
latest revision of Hartzell Service Letter 61) ...........................
Complete overhaul of engine or replace with factory rebuilt (See Note 7)..
0
Reinstall engine cowl ...............................................

O

C. CABIN GROUP
1. Inspect cabin entrance door and windows for damage. operation and
security ...........................................................
2. Inspect upholstery for tears .........................................
3. Inspect seats, seat belts. security brackets and bolts .....................
4. Inspect trim operation (See Note 17) .................................
...............................................
5. Inspect rudder pedals
6. Inspect parking brake and brake handle for operation and cylinder leaks..
7. Inspect control wheels, column, pulleys and cables .....................
8. Inspect flap control cable attachment bolt .............................
9. Inspect landing. navigation. cabin and instrument lights.................
10. Inspect instruments. lines and attachments ............................
11. Inspect gyro operated instruments and electric turn and bank (Overhaul
or replace as required) ..............................................

O

O

O

O

0

O

O

O

O
0

0

O

O

O

O

0

O

O

0
0

O

O

O

0
0

0
0
0
0

0
0
0

0
0

INSPECTION
O
O
O
O
O
O

Revised: 10 3 83

1G5

INSPECTION

PIPER CHEROKEE SERVICE MANUAL

TABLE 111-11.INSPECTION REPORT (cont.)
PA-28R
Inspection Time (hrs)
Nature of Inspection
50

100

500

1000

O
O

0
0

0
0

O
O
O
O

0
0
0
0

0
0
0
0

C. CABIN GROUP (cont)
12. Replace filters on gyro horizon and directional gyro or replace central
air filter ..........................................................
13. Clean or replace vacuum regulator filter ..............................
14. Inspect altimeter (Calibrate altimeter system in accordance with
FAR 91.170. if appropriate) .........
................................
15. Check operation of fuel selector valve (See Note 20) ....................
16. Inspect condition of heater controls and ducts .........................
17. Inspect condition and operation of air vents ...........................
18. Inspect condition of air conditioning ducts ...........................
19. Remove and clean air conditioning evaporator filter ....................

O

0

0

O

0

0

O

O

O

O

O

O

O
O
O

0
0
0

0
0
0

O
O
O
O

0
0
0
0

0
0
0
0

O

O
O

0
0

0
0

O
O

O
O

0
0

0
0

O
O
O

0
0
0

0
0
0

O

0

0

0
0
0
0O

0
O
0

0
O
0

O

O

OO

D. FUSELAGE AND EMPENNAGE GROUP
1. Remove inspection plates and panels .................................
2. Inspect baggage door. latch and hinges for condition, operation and
security ...........................................................
3. Inspect battery, box and cables (Inspect at least every 30 days. Flush
box as required and fill battery per instructions on box) ................
4. Inspect electronic installations .......................................
5. Inspect bulkheads and stringers for damage ...........................
6. Inspect antenna mounts and electric wiring for security and corrosion
in plugs...........................................................
7. Inspect hydraulic pump motor brushes (See Note 19) ...................
8. Inspect hydraulic pump fluid level (Fill as required) ....................
9. Inspect hydraulic pump lines for damage and leaks .....................
10. Inspect for obstructions and contamination in inlet of backup landing
gear extender actuator inlet head.....................................
11. Inspect air conditioning system for freon leaks .........................
12. Check freon level in sight gauge of receiver-dehydrator (Refer to
Service Manual)...................................................
13. Inspect air conditioner condenser air scoop rigging .....................
14. Inspect fuel lines. valves. sender units, and gauges for damage and
operation .........................................................
15. Inspect security of all lines ..........................................
16. Inspect vertical fin and rudder surfaces for damage .....................
17. Inspect rudder hinges. horn and attachments for damage and
operation.........................................................
18. Inspect rudder control stop to insure stop has not loosened and
lock nut is tight.
....................
...............................
19. Inspect vertical fin attachments ......................................
20. Inspect rudder hinge bolts for excess wear (Replace as required) .........
21. Inspect stabilator surfaces for damage ................................
22. Inspect stabilator. tab hinges. horn and attachments for damage and
operation .........................................................

Revised: 8 3 81

1G6

O

O

O

INSPECTION

PIPER CHEROKEESERVICE MANUAL
TABLE III-II. INSPECTION REPORT (cont)
PA-28R
Nature of Inspection

Inspection time (hrs)
500 1000

D. FUSELAGE AND EMPENNAGE GROUP (cont.)
23. Inspect stabilator control stops to insure stops have not loosened and locknut is tight.
24. Inspect stabilator attachments (see latest revision of Piper Service Bulletin 856).........
25. Inspect stabilator and tab hinge bolts and bearings for excess wear (Replace as
required) ........................................................................................................................
26. Inspect stabilator trim mechanism..................................................................................
27. Check all cable tensions (use tensiometer) (See Note 18) .............................................
28. Inspect aileron, rudder, stabilator, stabilator trim cables, turnbuckles, guides and
pulleys for safety, damage and operation (See Note 24)................................................
29. Clean and lubricate stabilator trim drum screw (Refer to lubrication chart in
Service Manual) .............................................................................................................
30. Inspect stabilator balance weight attachments and arm for security and condition .......
31. Inspect emergency locator transmitter battery for replacement date per Service
Manual (Refer to the latest revision of Piper S/L No. 820) ...........................................
32. Clean and lubricate all exterior needle bearings ............................................................
33. Lubricate per lubrication chart in Service Manual............................ .............................
O
34. Inspect anti-collision light for security and operation ...................................................
35. Inspect security of Autopilot bridle cable clamps..........................................................
36. Inspect all control cables, air ducts, electrical leads, lines, radio antenna leads and
attaching parts for security, routing, chafing, deterioration, wear and correct
installation ......................................................................................................................
37. Reinstall inspection plates and panels............................................................................

O
O

O

0
0
0

0O
0O
0O

0

0O

0

0 0
0O

0

0o

O

O
Oo
o
0 0O
0
0O

0
0

0O
0O

E. WING GROUP
1. Remove inspection plates and fairings ..........................................................................
2. Inspect surfaces and tips for damage, loose rivets, and condition of walk-way ............
3. Inspect aileron hinges and attachments..........................................................................
4. Inspect aileron control stops to insure stop has not loosened and lock nut is tight........
5. Inspect aileron balance weight and arm for security and condition...............................
6. Inspect aileron cables, pulleys and bellcranks for damage and operation .....................
7. Inspect flaps and attachments for damage and operation ..............................................
8. Inspect condition of bolts used with hinges (Replace as required)................................
9. Lubricate per lubrication chart in Service Manual (Section II) .....................................
10. Inspect wing attachment bolts and brackets...................................................................
11. Inspect fuel tanks and lines for leaks and water (See Note 15)......................................
12. Fuel tanks marked for capacity .....................................................................................
13. Fuel tanks marked for minimum octane rating ..............................................................
14. Inspect fuel cell vents (See Note 16) .............................................................................

O
O
O
O
0
0
0

0
0
0

0
0
0

0
0
0

O0
0
0
0
0
0

0
0
0
0
0

0
0
0
O
O
0
0
0
0
0

Interim Revision: February 15, 1995

INSPECTION

1G7

PIPER CHEROKEE SERVICE MANUAL

TABLE III-II. INSPECTION REPORT (cont)
PA-28R

Nature of Inspection

Inspection Time (hrs)

50

E. WING GROUP (cont)

100 500 1000

15. Inspect all control cables, air ducts, electrical leads, lines and attaching
parts for security, routing, chafing, deterioration, wear and correct
installation ........................................................
16. Reinstall inspection plates and fairings ................................

O
O

0
0

0
0

O
O
O

O
0
o

O
O
O
O

0
O
O
0
0

0
0
0
0
0
0
0
O

O
O
O
o
O

0
0
0
0
0
0

O
0
0
0
0

O

0

0

O

0
0

O
O

0
0

0
0
O
0
0

0

0

0
0

0
0

F. LANDING GEAR GROUP
1. Inspect oleo struts for proper extension (N-2.75 in., M-2.0 in.) Check
fluid level as required) ..............................................
2. Inspect nose gear steering control and travel ...........................
3. Inspect wheels for alignment ........................................
4. Put airplane on jacks ............................................
5. Inspect tires for cuts, uneven or excessive wear and slippage .............
6. Remove wheels, clean, check and repack bearings ......................
7. Inspect wheels for cracks, corrosion and broken bolts ...................
8. Check tire pressure (N-30 psi M-27 psi) ...............................
9. Inspect brake lining and disc ........................................
10. Inspect brake backing plates.........................................
11. Inspect brake and hydraulic lines ....................................
12. Inspect shimmy dampener ...........................................
13. Inspect gear forks for damage .......................................
14. Inspect oleo struts for fluid leaks and scoring ..........................
15. Inspect gear struts, attachments, torque links, retraction links and
bolts for condition and security ......................................
16. Inspect downlock for operation and adjustment ........................
17. Inspect torque link bolts and bushings (Rebush as required) .............
18. Inspect drag and side brace link bolts (Replace as required) .............
19. Inspect gear doors and attachments ..................................
20. Inspect warning horn and light for operation ..........................
21. Retract gear - check operation .......................................
22. Retract gear - check doors for clearance and operation .................
23. Inspect anti-retraction system ......................................
24. Inspect actuating cylinders for leaks and security .......................
25. Inspect all hydraulic lines, electrical leads, and attaching parts for
security. routing, chafing, deterioration, wear and correct installation
(See the latest revision of Piper SL No. 808 and 810) ..................
26. Inspect position indicator switch and electrical leads for security .........
27. Lubricate per lubrication chart in Service Manual (Section II) ...........
28. Remove airplane from jacks .........................................

O

O

O

O

O
O
O

O
O

O
O

O

O

O

0

0

0

0

0

O

O

O

0

G. OPERATIONAL INSPECTION
1. Check fuel pump and fuel tank selector ...............................
2. Check fuel quantity. pressure and flow readings........................

Reissued: 1 15 81

1G8

O
O

O
O

O
O

O

INSPECTION

PIPER CHEROKEE SERVICE MANUAL

TABLE III-11. INSPECTION REPORT (cont.)
PA-28 R
Inspection Time (hrs)
Nature of Inspection
50

100

500

1000

O
O
O
O
O
O
O
O
O
O

O
O
O
O
O

0
0
0
0
0

0
0
0
0
0

O

0

0

O
O
O
O

0
0
0
0

0
0
0
0

O
O
O
O
O

O
O
O
O
O

0
0
0
0
0

0
0
0
0
0

O
O
O

O
O
O
O

0
0
0
0

0
0
0
0

O
O
O
O
O

O
O
O
O
O

O
O
O
O
O

o
O
O
O
O

G. OPERATIONAL INSPECTION (cont)
3. Check oil pressure and temperature ..................................
4. Check alternator output ............................................
5. Check manifold pressure ............................................
6. Check alternate air ................
..............................
7. Check parking brake ...............................................
8. Check vacuum gauge ...............................................
9. Check gyros for noise and roughness .................................
10. Check cabin heater operation ........................................
11. Check magneto switch operation .....................................
12. Check magneto RPM variation ......................................
13. Check throttle and mixture operation (See the latest revision of
Piper Service Bulletin No. 448) ......................................
14. Check propeller smoothness .........................................
15. Check propeller governor action.....................................
16. Check engine idle.................................................
17. Check electronic equipment operation ................................
18. Check operation of Autopilot. including automatic pitch trim. and
Manual Electric Trim (See Note 21.) .................................
19. Check air conditioner compressor clutch operation .....................
20. Check air conditioner condenser scoop operation ......................
21. Check (FLY Aircraft) Landing Gear System (See Note 14) ..............
H. GENERAL
1.
2.
3.
4.
5.

Aircraft conforms to FAA Specification .........................
All latest FAA Airworthiness Directives complied with ............
All latest Manufacturers Service Bulletins and Letters complied with
Check for proper Flight Manual ................................
Aircraft papers in proper order .................................

INSPECTION

Revised: 10 3 83

1G9

PIPER CHEROKEESERVICEMANUAL
TABLEIII-II. INSPECTIONREPORT (cont)
PA-28R
NOTES:
1. Referto the last card of the Piper Parts Price List - Aerofiche,for a checklistof current revisiondates
to Piper Inspection Reports and Manuals.
2. All inspectionsor operations are required at each of the inspection intervals as indicated by a (O).
Both the annual and 100 hour inspections are complete inspections of the airplane, identical in
scope, while both the 500 and 1000 hour inspections are extensions of the annual or 100 hour
inspections,which require a more detailed examination of the airplane, and overhaulor replacement
of some major components. Inspections must be accomplished by persons authorized
by the FAA.
3. Piper Service Bulletins are of special importance and Piper considers compliance mandatory.
4. Piper Service Letters are product improvements and service hints pertaining to servicing the
airplane and should be given careful attention.
5. Inspectionsgiven for the power plant are based on the enginemanufacturer's operator's manual for
the particular airplane. Any changes issued to the engine manufacturer's operator's manual shall
supersede or supplement the inspections outlined in this report.
6. Intervals between oil changes can be increased as much as 100%on enginesequipped with full flow
(cartridge type) oil filters, provided the element is replaced each 50 hours of operation. (Refer to
latest revision of Lycoming Service Instruction No. 1070, for additional information and recommended service procedures when using alternate fuels.)
7. Replace or overhaul as required or at engine overhaul. (For engine overhaul, referto latest revision
of Lycoming Service Instruction No. 1009.)
8. Replace flexible oil lines as required, but no later than 1000 hours.
9. The compressor oil level should not be checked unless a freon leak has occurred which requiresan
addition of freon to the system.
10. Clean any traces of oil from the clutch surface.
11. At every 400 hours of engine operation, remove the rocker box covers and check for freedom of
valve rockers when valvesare closed. Look for evidenceof abnormal wear or broken parts in the
area of the valve tips, valvekeeper,springsand spring seat. If any indicationsare found, the cylinder
and all of its components should be removed (including the piston and connecting rod assembly)
and inspected for further damage. Replace any parts that do not conform with limits shown in the
latest revision for Lycoming Special Service Publication No. SSP1776.
12. Check cylinders for evidence of excessive heat indicated by burned paint on the cylinders.
This condition is indicative of internal damage to the cylinder and, if found, its cause must be
determined and corrected before the aircraft is returned to service.
Heavy discoloration and appearance of seepage at the cylinder head and barrel attachment
area is usuallydue to emissionof thread lubricant used during assemblyof the barrel at the factory,
or by slight gas leakagewhich stops after the cylinder has been in servicefor awhile. This condition
is neither harmful nor detrimental to engine performance and operation. If it can be proven
that leakage exceeds these conditions, the cylinder should be replaced.
13. Check throttle body attaching screws for tightness; the correct torque for these screwsis 40 to 50
inch-pounds.

Revised: 10/3/83
Interim Revision: 5/6/87

INSPECTION

PIPER CHEROKEE SERVICE MANUAL

TABLE III-II. INSPECTION REPORT (cont)
PA-28R
NOTES:
14. Fly aircraft to check landing gear system in accordance with instructions given in Section VI, Paragraph
6-14, of PA-28 Service Manual 753 586. (Refer to the latest revision of Piper Service Letter No. 810.)
15. Replace flexible fuel tank supply hose at time of engine overhaul.
16. Replace fuel tank vent line flexible connections as required, but no later than 1000 hours of service.
17. If airplane has electric trim, refer to the latest revision of Piper Service Bulletin No. 556.
18. Maintain cable tensions specified in Section V of Service Manual.
19. Inspect brushes every 100 hours on airplanes used for training or every 500 hours on airplanes used for
normal service. (Refer to Service Manual, Section VI.)
20. Refer to latest revision of Piper Service Bulletin No. 355.
21. Refer to Flight Manual Supplement for preflight and flight checks, for intended function in all modes.
22. Refer to latest information for the particular propeller being inspected:
Hartzell Service Letter No. 61
McCauley Service Bulletin No. 137.
23. Inspect Teflon bushing (lower to upper cowling attachment) for condition at each 100 hours. Replace
bushing on condition, but no later than 500 hours time in service. Inspect pin for condition and replace
as necessary.
24. If not already installed, add access panels, see Paragraph 4-57a. Inspect stabilator control cables, see
Paragraph 3-11a.

Interim Revision: February 15, 1995

INSPECTION

1Gll

1G12
INTENTIONALLY LEFT BLANK

SECTION
IV
STRUCTURES
Aerofiche
Grid No.
4-1.
4-2.
4-3.
4-4.
4-7.
4-10.
4-13.
4-16.
4-17.
4-20.
4-23.
4-26.
4-29.
4-30.
4-33.

Reissued:1/15/81

Introduction ................................
Description
Wing Group .
Wing Tip ..
4-5.
Removal of Wing
. . . . . . . .
. . . .Tip..................
. . . . . . . . . . . .. .. ....
4-6.
Removal of Wing Tip .................
Aileron ...
Installation of Aileron ..................
4-8.
4-9.
Wing Flap .
Removal of Wing Flap ..................
4-11.
4-12.
Installation
of Wing Flap.
Removal
..................
Installationof Aileron
of Aileron...................
Wing .....
of.................
Wing
Removal
.
4-14.
4-15.
Empennage Gr Removal of Stabilator .................
Installation of Stabilator ................
Stabilator
4-18.
4-19.
Trim
Tab............................
Stabilator Trim
Removal of StabilatorTrim Tab ............
4-21.
4-22.
Installation of Stabilator Trim Tab.
Rudder ...
Removal
of of
Rudder
4-24.
..................
Installation
RudderFin.............
Removal
of
Vertical
Installation of Vertical
Fin............
4-25.
Vertical Fin .
4-27.
Assembly............................
Fin...........
Removal of Vertical
4-28.
.....
..........
Windshield
Fuselage Assen Installation
of of
Vertical
Fin
Removal
of
Vertical................
Fin.................
Installation
Windshield
4-31.
4-32.
Side Windows
Removal of Side Windows...............
4-34.
4-35.
Installation of Side Windows ..............

1G13

....
IG15
IG16
1G16
1G16
1G17
IG17
1G17
1G17
1G18
1G18
1G18
1G18
1G18
1H2
1H6
1H6
1H6
1H8
IH13
IH13
1H13
IH13
1H13
1H13
1H14
1H14
1H14
1H15
1H15
1H15
1H15
IH17
1H17
1H18

1

PIPER CHEROKEE SERVICE MANUAL
Paragraph
4-36.

4-49.

4-57.
4-57a.
4-58.

4-63.

4-69.

4-79

Aerofiche
Grid No.
Door (Entrance) .......................................................................................... 1H 19
4-37.
Removal of Door...............................................................1H19
4-38.
Installation of Door .......................................................... 1H19
1H 19
4-39.
Adjustment of Door .....................................
4-40.
Removal of Door Latch Mechanism ................................. 1H19
4-41.
Removal and Installation of Door Seal Snubbers ............. 1H20
4-42.
Installation of Door Latch Mechanism ............................. 1H21
4-43.
Adjustment of Door Latch Mechanism ............................. 1H21
Removal of Door Lock Assembly .................................... 1H21
4-44.
4-45.
Installation of Door Lock Assembly .................................1 H21
4-46.
Removal of Door Safety Latch ........................................ H21
4-47.
Installation of Door Safety Latch ..................................... 1H22
4-48.
Adjustment of Door Safety Latch ..................................... 1H22
Baggage Door ........................................................................................... H22
4-50.
Removal of Baggage Door ................................................ H22
4-51.
Installation of Baggage Door ........................................... 1H22
Removal of Baggage Door Lock Assembly ...................... 1H22
4-52.
4-53.
Installation of Baggage Door Lock Assembly .................. 1H23
4-54.
Removal of Baggage Door Hinge ..................................... 1H23
4-55.
Installation of Baggage Door Hinge ................................. 1H23
4-56.
Rigging Instructions - Seat Back Lock and Release .........1H23
Structural Repairs ....................................................................................... 113
Baggage Compartment Inspection Hole and Cover Plate .......................... 13
113
Fiberglas Repairs ...............................................................
4-59.
Fiberglas Touch-Up and Surface Repairs..........................1I3
4-60.
Fiberglas Fracture and Patch Repairs ................................1I4
4-61.
Thermoplastic Repairs ...................................................... 1I6
4-62.
A.B.S. Thermoplastic Landing Gear and Strut Fairing
Repair Instructions ..................................................... 1I10
Safety Walk Repair.....................................................................................1I14
4-64.
Surface Preparation for Liquid Safety Walk ..................... 1114
4-65.
Product Listing for Liquid Safety Walk Compound ......... 1114
4-66.
Application of Liquid Safety Walk Compound ................. 1I14
Surface Preparation for Pressure Sensitive Safety Walk...1I14
4-67.
4-68.
Application of Pressure Sensitive Safety Walk................. 1I15
Control Surface Balancing ........................................................................ 1I16
Checking Control Surface Balance ................................... 1116
4-70.
Checking Control Surface Free Play ................................. 1116
4-71.
Balancing Equipment ........................................................ 1I18
4-72.
4-73.
Balancing Ailerons...........................................................1I18
4-74.
Balancing Rudder..............................................................1I19
4-75.
Balancing Stabilator ......................................................... 1I22
4-76.
Aileron Balance Weight Modification .............................. 1I23
4-77.
Flap Inspection and Modification ..................................... 1J1
4-78.
Stabilator Drain Holes ..................................................... 1J1
Baggage Compartment Inspection Hole and Cover Plate .......................... 1J3

Interim Revision: February 15, 1995

1G14

PIPER CHEROKEE SERVICE MANUAL

SECTIONIV
STRUCTURES
4-1. INTRODUCTION.This section explains the removal and installation procedures for
the structural surfaces of the airplane. For the removal, installation, and rigging and
adjustment procedures of the controlling components of the various structural surfaces,
refer to Section V.
NOTE
When torquing structural assemblies, standard torque values
are to be used as found in Section II, Federal Aeronautics
Manual 18 or FAA Advisory Circular 43.13-1, unless
otherwise stated in this section.
4-2. DESCRIPTION. The PA-28 is an all metal semi-monocoquestructure with an overall
length ranging from 23 feet 5.40 inches to 24 feet 7.38 inches depending on the model
involved. The fuselage is constructed of bulkheads, stringer and stiffeners, to which all of
the outer skin is riveted. Windowsinclude a single pane windshield and four to six side
windows, again depending upon the model. All windows are singlepane, the exception being
the PA-28-235, Serial Nos. 28-10720 and up, which are equipped with double pane side
windows. A storm window is located in the forward lower section of the left window and
can be opened inward when the latch is released. The cabin entrance door is located on the
right side of the fuselage, above the wing, and is equipped with a safety latch on the top of
the door, which can be operated from the inside or outside. A door provided for entrance to
the baggagecompartment (all models except PA-28-140) is locatedjust aft of the right wing
with a key lock installed.
Each wing panel is an all metal, full cantilever semi-monocoquetype construction with a
removable wing tip. Installed in each wing ahead of the main spar is a metal fuel tank with a
capacity of 25 U.S. gallons each or 50 U.S. gallons total. The PA-28-235 is equipped with
fiberglass tip tanks which increases the capacity to 42 U.S. gallons per wing or 84 U.S.
gallons total. Attached to each wing is an aileron, flap and main landing gear.The wingsare
attached to each side of the fuselageby inserting the butt ends of the main spars into a spar
box carry-through. The spar box is an integral part of the fuselagestructure which provides,
in effect, a continuous main spar with splicesat each side of the fuselage.There are also fore
and aft attachments at the front and rear spars.

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PIPER CHEROKEE SERVICE MANUAL

The all metal empennage group is a full cantilever design consisting of a vertical
stabilizer (fin), rudder and stabilator, all with removable tips. The stabilator has a trim tab
attached that is controllable from the cockpit. The stabilator also incorporates one channel
main spar that runs the full length of the stabilator and hinges to the aft bulkhead assembly
of the fuselage. All exterior surfaces are coated with enamel or acrylic lacquer. As an option
the airplane may be completely primed with zinc chromate.
4-3. WINGGROUP.
NOTE
The major subassemblies of the wing may be removed
individually or the wing may be removed as a unit. To
remove a wing, a fuselage supporting cradle is required.
4-4. WINGTIP.
4-5. REMOVALOF WINGTIP.
a. PA-28-140 PA-28-150,-160, -180 and PA-28R:
1. Remove the screwsholding the wing tip to the wing, being careful not to damage
the wing or wing tip.
2. Pull off the wing tip far enough to disconnect the position light wire assembly.
The ground lead may be disconnected at the point of connection on the wing rib, and the
positive lead may be disconnected at the wire terminal or unscrewed from the light
assembly.
b. PA-28-235: Incorporated in each wing tip is a 17 gallon auxiliary fuel tank. Given
below are the steps recommended for removal of the tip:
1. Drain fuel from the tank to be removed. (Refer to Draining Fuel System,
Section II.)
2. Remove the accesscover from the bottom of the wing tip.
3. By working through the access, disconnect the fuel line, fuel quantity
transmitting wire and position light wire. Remove the two nuts, washers and bolts which
hold the tank to the wing.
4. Carefully remove the screws from around the wing tip and remove the tip
assembly.
c. Inspect the wing tip to ascertain that it is free of cracks, severe nicks and minor
damage. If repair is required, refer to paragraph 4-57.

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PIPER CHEROKEE SERVICE MANUAL

4-6. INSTALLATIONOF WINGTIP.
a. PA-28-140;PA-28-150,-160, -180 and PA-28R:
1. Place the wing tip in a position that the navigationlight leads may be connected.
Connect the ground lead to the wing rib by use of a screw and nut, and the positive lead to
the position light by connecting the wire terminals or screwing the connectors together.
Insulate the wire terminals and be certain that the ground lead is free of dirt and film to
insure a good connection.
2. Insert the wing tip into position and install the screws around the tip. Use
caution to refrain from damaging the wing tip or wing. Check operation of the position
light.
b. PA-28-235:
1. Position the wing tip in place on the wing and insert the two bolts, washersand
nuts into their proper places and tighten. Replace the severalscrewsaround the tip tank and
tighten. Connect the position light leads, the fuel quantity transmitting wire and the fuel
line.
2. After the wing tip is installed and all connections are secured, fill the tip tank
and check for fuel leaks, operation of the fuel gauge and position light. Install the access
cover to the bottom of the wing tip.
4-7. AILERON.
4-8. REMOVALOF AILERON. (Refer to Figure 4-1.)
a. Disconnect the aileron control rod at the aileron attachment point by removing the
nut, washers and bolt from the rod end bearing. To simplify installation note location of
washersremoved.
b. Remove the attaching screws, with nuts, from the hinges at the leading edge of the
aileron, and remove the aileron by lowering the inboard end and swingingit forward to
allow the balance arm to clear the opening in the outboard rib.
4-9. INSTALLATIONOF AILERON. (Refer to Figure 4-1.)
a. Install the balance arm into the opening in the outboard rib by movingthe inboard
end of the aileron forward to allow the arm to be inserted through the opening. (When
installing an aileron, should the balance weight assembly, P/N 66766-00, replace an earlier
balance weight assembly, P/N 65388-34 (L) or 65388-35 (R), the wing butt rib will require
modifying per instructions in Paragraph 4-75.) Move the aileron into place and install
attaching screws and nuts. Ascertain that the aileron is free to move with no interference.
b. Attach the aileron control rod with bolt, washers and nut, dividing the washers so
that the aileron is free to rotate from stop to stop without the control rod binding or
rubbing on the opening in the aft spar. Be certain that the rod end bearing has no side play
when tightening the bolt and that the rod does not contact the side of the bracket.
c. Actuate the aileron controls to insure freedom of movement.

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PIPER CHEROKEE SERVICE MANUAL

4-10. WINGFLAP.
4-11. REMOVALOF WINGFLAP. (Refer to Figure 4-1.)
a. Extend the flaps to their fullest degree and remove the bolt and bushing from the
rod end bearing by use of an angle or offset screwdriver.
b. Remove the nuts, washers, bushing and hinge bolts that hold the flap to the wing
assembly.
c. Pull the flap straight back off the wing. (Refer to Paragraph 4-75 for flap inspection
and modification.)
4-12. INSTALLATIONOF WINGFLAP. (Refer to Figure 4-1.)
a. Replace the wing flap by placing the flap onto its proper position and inserting the
hinge bolts, bushings,washers,and nuts.
b. With the flap control in the full flap position, place the bushing on the outboard side
of the rod end bearing and insert and tighten the bolt.
c. Operate the flap severaltimes to be certain it is operating freely.
4-13. WING.
4-14. REMOVALOF WING. (Refer to Figure 4-2.)
a. PA-28-140;PA-28-150,-160, -180 and PA-28-235.
1. Close the fuel valve and drain the fuel from the wing to be removed. (Refer to
DrainingFuel System, Section II.)
2. Drain the brake lines and reservoir.(Refer to DrainingBrake System, Section II.)
3. Remove the accessplate at the wing butt rib and wing inspection panels. (Refer
to AccessPlates and Panels, Section II.)
4. Remove the front and back seats from the airplane.
5. Expose the spar box and remove the cockpit side trim panel assembly that
corresponds with the wingbeing removed.

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1G18

STRUCTURES

PIPER CHEROKEE SERVICE MANUAL

A339

A336

A337

WING

SCREW AN525-10-8
WASHER R AN960-10
NUT MS 20365-1032C
8 REQ
13 REQ PA-28-181 ONLY

SKETCH A

AILERON

SKETCH B

A322

BOLT AN3-12A
WASHER AN960-10
NUT MS20365-1032C

(6 REQ)

A322
AN3-11A
AN960-1 0
MS20365-1032C
63900-19
(2 REQ)
2 REQ

AN3-13A
AN960-10
MS20365-1032C
63900-20
(2 REQ)

SKETCH D

SKETCH C

Figure 4-1.

Aileron and Flap Installation

Reissued:1/15/81

STRUCTURES

1G19

PIPER CHEROKEE SERVICE MANUAL

A321

O

O

EXISTING ANCHORNUT
TO BE MODIFIED TO
AGREE WITH SKETCH E-2

SKETCH E-1
C335

1.10
MODIFIED
DEMENSION

.81
EXISTING
DIMENSION

.55R-

NUT AN310-3
WASHER AN960-10
COTTER PIN
MS24665-132

MODIFIED CUTOUTDETAIL
RIGHT AND LEFT SIDE

SKETCH E-2

Figure 4-1. Aileron and Flap Installation (cont.)
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STRUCTURES

1G20

PIPER CHEROKEESERVICEMANUAL

6.

Place the airplane

on jacks.

(Refer to Jacking,

Section II.)

NOTE
of control
To help facilitate reinstallation
fuel and hydraulic lines, mark cable and
some identifying manner and attach a line
plicable to cables before drawing them
fuselage or wing.

cables, and
line ends in
where apthrough the

7. Disconnect the aileron balance and control cables at the turnbuckles
that are located within the fuselage aft of the spar.
8. If the left wing is being removed, remove the cotter pin from the pulley
bracket assembly to allow the left aileron balance cable end to pass between the
pulley and bracket.
9. Disconnect the flap from the torque tube by extending the flap to its
fullest degree, and removing the bolt and bushing from the bearing at the aft end
of the control rod.
10. Disconnect the fuel line at the fitting located aftof the spar at the wing
butt line.
CAUTION
fuel, hydraulic
To prevent damage or contaminationof
and miscellaneous lines, placea protective cover over
the line fittings and ends.
harness as11. Remove the clamps necessary to release the electrical
sembly. Disconnect the leads from the terminal strip assembly by removing the
nuts and washers.
cover, and appropriate
trim panel removed, disconnect the hydraulic
12. With the appropriate
brake line at the fitting located within the cockpit at the leading edge of the wing.
to disconnect
13. If the left wing is being removed, it will be necessary
the wing butt
at
the
cockpit
within
located
elbows
at
the
tubes
static
and
pitot
the
line.
14. Arrange a suitable fuselage cradle and supports for both wings.
15. Remove the wing jacks.
16. Remove the front and rear spar nuts, washers and bolts.
17. Remove the eighteen main spar bolts.
18. Slowly remove the wing being certain that all electrical leads. cables
and lines are disconnected.

STRUCTURES

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1G21

1G22
INTENTIONALLY LEFT BLANK

PIPER CHEROKEE SERVICE MANUAL

BOLT LEGEND
POSITION
A-1
A-2
A-3
A-4
B-1
B-2
B-3
B4
C-1
C-2
C-3
C-4
C-5
D-1
D-2
D-3
D-4
D-5

BOLT*
AN176-13A
AN176-12A
AN176-12A
AN176-12A
AN176-14A
AN176-13A
AN176-13A
AN176-13A
AN176-13A
AN 176-13A
AN176-13A
AN176-13A
AN176-13A
AN176-13A
AN176-13A
AN176-13A
AN 175-13A
AN176-13A

WASHER
NUT*
MS20365-624C
MS20365-624C
MS20365-624C
MS20365-624C
MS20365-624C
MS20365-624C
MS20365-624C
MS20365-624C
MS20365-624C
MS20365-624C
MS20365-624C
MS20365-624C
MS20365-624C
MS20365-624C
MS20365-624C
MS20365-624C
MS20365-624C
MS20365-624C

UNDER HEAD
(1) AN960-616
(1) AN960-616
(1) AN960-616
(1) AN960-616
(1) AN960-616
(1) AN960-616
(1) AN960-616
(1) AN960-616
(1) 96352-3
(1) 96352-3
(1) 96352-3
(1) 96352-3
(1) 96352-3
(1) 96352-3
(1) 96352-3
(1) 96352-3
(1) 96352-3
(1) 96352-3

(1)
(1)
(1)
(1)
(2)
(2)
(2)
(2)
(1)
(2)
(2)
(2)
(1)
(1)
(2)
(2)
(2)
(1)

UNDER NUT
AN960-616& (1) 96352-3
AN960-616&(1) 96352-3
AN960-616& (1) 96352-3
AN960-616& (1) 96352-3
AN960-616
AN960-616
AN960-616
AN960-616
AN960-616
AN960-616
AN960-616
AN960-616
96352-3
AN960-616
AN960-616
AN960-616
AN960-616
96352-3

*Torque Boltheads on Upper Spar Cap and Nuts on Lower Spar Cap 360-390 in-lbs
1785

SKETCH D

Figure 4-2. Wing Installation (cont.)
Reissued:1/15/81

1G24

STRUCTURES

PIPER CHEROKEE SERVICE MANUAL

b.

PA-28R:

1. Close the fuel valve and drain the fuel from the wing to be removed.
(Refer to Draining Fuel System, Section II.)
2. Drain the brake lines and reservoir. (Refer to Draining Brake System,
Section II. )
3. Drain the hydraulic lines of the landing gear of the wing to be removed
by separating the lines and elbows at the actuating cylinder.
4. Remove the access plate at the wing butt rib and wing inspection panels. (Refer to Access Plates and Panels, Section II.)
5. Remove the front and back seats from the airplane.
6. Expose the spar box and remove the side trim cockpit panel assembly
that corresponds with the wing being removed.
7. Place the airplane on jacks. (Refer to Jacking, Section II.)
NOTE
To help facilitate reinstallation
of control cables, and
fuel and hydraulic lines, mark cable and line ends in
some identifying manner and attach a line where applicable to cables before drawing them through the
fuselage or wing.

8. Disconnect the aileron balance and control cables at the turnbuckles that
are located within the fuselage aft of the spar.
9. If the left wing is being removed, remove the cotter pin from the pulley
bracket assembly to allow the left aileron balance cable end to pass between the
pulley and bracket.
10. Disconnect the flap from the torque tube by extending the flap to its
fullest degree, and removing the bolt and bushing from the bearing at the aft end
of the control rod.
11. Disconnect the fuel line at the fitting located inside of thewing, by removing the acces panel on the forward inboard portion of the wheel well and
reaching through to the fuel line coupling.
CAUTION

To prevent damage or contamination of fuel, hydraulic
and miscellaneous lines, place a protective cover over
the line fittings and ends.
12. Remove the clamps that are necessary to release the electrical harness
assembly. Disconnect the leads from the terminal strip by removing the cover,

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1H1

STRUCTURES

PIPER CHEROKEE SERVICE MANUAL

and appropriate nuts and washers.
13. With the appropriate trim panel removed, disconnect the hydraulic
brake line at the fitting located within the cockpit at the leading edge of the wing.
14. Disconnect the landing gear hydraulic lines at the fittings aft of the spar
and within the fuselage.
15. If the left wing is being removed, it will be necessary to disconnect
pitot and static tubes at the elbows located within the cockpit at thewing butt line.
16. Arrange a suitable fuselage cradle and supports for both wings.
17. Remove the wing jacks.
18. Remove the front and rear spar nuts, washers and bolts.
19. Remove the eighteen main spar bolts.
20. Slowly remove the wing being certain that all electrical leads, cables
and lines are disconnected.
4-15. INSTALLATION OF WING. (Refer to Figure 4-2. )
a. PA-28-140;PA-28-150,-160, -180 and PA-28-235:
NOTE
PA-28-150,-160 Serial Nos. 28-1 to 28-45 incl., 28-47 to
28-54 incl., 28-56, 28-57, 28-61 to 28-77 incl., 28-79 to
28-84 incl., 28-86 to 28-89 incl., 28-92, 28-93 and 28-94.
The subject airplanes indicated by the above serial numbers were equipped
at the factory with wing panel assemblies having a wasHout of 0 ° , (P/N 62010-41
L W and P/N 62010-42 R W).
All airplanes not indicated in the above serial number listing are equipped
with wing panels modified to 20of washout, (P/N 62015-04 L W and P/N 62015-03
R W).
During the service life of the subject airplanes there may be occasion to
replace one or bothof thewingpanels having 0° washout. Undernocircumstances
should one twisted and one nontwisted wing be used on the same airplane. If an
interchange of salvaged nontwisted wing panels is made in the field, the stall
characteristics shall be tested to the requirement of Civil Air Regulation 3.120
by an authorized representative of Piper Aircraft Corporation or the Federal
Aviation Administration. Since the number of airplanes equipped with 0°washout
wing panels is relatively small, this type wing assembly will not be available for
All replacement wing panels, when required, will be furnished
replacement.
having the 20 washout.
1. Ascertain that the fuselage is positioned solidly on a support cradle.
2. Place the wing in position for installation, with the spar end a few inches

STRUCTURES

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1H2

PIPER CHEROKEE SERVICE MANUAL

from the side of the fuselage and set on trestles.
3. Prepare the various lines, control cables, etc. for inserting into the
wing or fuselage when the wing is slid into place.
4. Slide the wing into position on the fuselage.
5. Install the eighteen main spar bolts in accordance with the bolt legend.
NOTE
When replacing a wing assembly, ascertain the wing
butt clearance is maintained. (Refer to Sketch A,
Figure 4-2.)
6. Install the bolt, washers and nut that attaches the front spar with the
fuselage fitting. A minimum of one washer is required under the nut, then add
washers as needed to leave a maximum of one and one-half threads visible or a
minimum of the bolt chamfer exposed.
7. Insert the number of washers required between the forward face of the
wing fitting and aft face of the fuselage fitting. The maximum number of washers
allowedis one AN960C-516Land one AN960C-516. It is also acceptable to have
the faces of the fittings against each other. After the required washers are inserted between the plates, install the bolt and check to insure that no threads are
bearing on the forward plate prior to installing the nut. Use the shortest bolt
which will leave 0.580 of an inch minimum from the fitting to the end of the bolt.
Add washers, AN960-516, as required, (minimum of one), to leave a maximum
of one andone-half visible thread, or minimum of the bolt chamfer exposed after
the nut is torqued.
8. Torque the eighteen main spar bolt nuts or bolt heads 360 to 390 inch-pounds.Be
certain that the bolts, nuts and washersare installed in accordance with the bolt legend. The
forward spar attachment bolt should be torqued, in accordance with the chart of
recommended torque requirements givenin Section II. Torque the rear spar attachment bolt
from 200 to 225 inch-pounds.
9. Install the wing jacks and the tail support to the tail skid with approximately 250 pounds of ballast on the base of the tail support. Remove the fuselage
cradle and wing supports.
10. If the left wing was removed, it is necessary that the pitot and static
tubes to be connected at the elbows located within the cockpit at thewing butt line.
On occasion, one tube may be painted red, denoting the pitot tube. Replace or
install clamps where found necessary. In the event that a heated pitot is installed,
the plus lead must be connected at the fuselage.
11. Connect the hydraulic brake line onto the fitting located within the cockpit at the leading edge of the wing.
12. Connect the leads to the appropriate posts on the terminal strip and

Reissued:
Reissued:

1/15/81

1/15/81

STRUCTURES
STRUCTURES

PIPER CHEROKEE SERVICE MANUAL

install the washers and nuts. (For assistance in connecting the electrical lead,
refer to the Electrical Schematics in Section VI.) Place the clamps along the
electrical harness to secure it in position and install the terminal strip dust cover.
13. Remove the cap from the fuel line and connect it at the fitting located
aft of the spar at the wing butt line.
14. Connect the aileron balance and control cables at the turnbuckles that
are located within the fuselage aft of the spar. After the left balance cable has
been inserted through the bracket assembly and connected, install a cotter pin
cable guard into the hold that is provided in the bracket assembly.
15. Connect the flap by placing the flap handle in the full flap position, place
the bushing on the outside of the rod end bearing and insert and tighten bolt.
16. Check the rigging and control cable tension of the ailerons and flaps.
(Refer to Rigging and Adjustment of Ailerons, and Rigging and Adjustment of
Flaps, Section V.)
17. Service and refill the brake system with hydraulic fluid in accordance
with Servicing Brake System, Section II. Bleed the system as given in Section VII
and check for fluid leaks.
18. Service and fill the fuel system in accordance with Servicing Fuel
System, Section II. Open the fuel valve and.check far leaks and flow.
19. Check the operation of all electrical equipment, and pitot and static
system.
20. Remove the airplane from the jacks.
21. Tnstall the cockpit trim panel assembly, spar box carpet, the front and
back seats, and wing butt rubber molding.
22. Replace all the access plates and panels on the wing involved.
b. PA-28R:
1. Ascertain that the fuselage is positioned solidly on a support cradle.
2. Place the wing in position for installation, with the spar end a few inches
from the side of the fuselage and set on trestles.
3. Prepare the various lines, control cables, etc. for inserting into the
wing or fuselage when the wing is eased into place.
4. Slide the wing into position of the fuselage.
5. Install the eighteen main spar bolts in accordance with the bolt legend.
6. Install the bolt, washers, and nut that attaches the front spar and fuselage fitting. A minimum of one washer is required under the nut, then add washers as needed to leave a maximum of one and one-half threads visible or a minimum of the bolt chamfer exposed7. Insert the number of washers required between the forward face of the
wing fitting and aft face of the fuselage fitting. The maximum number of washers
allowed is one ofAN960C-516Land oneAN960C-516. It is also acceptable to have
the faces of the fitting against each other. After the required washers are inserted between the plates, install the bolt and check to insure that no threads are

Reissued: 1/15/81 '

1H4

STRUCTURES

__-

- -- - -- -

-

--

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PIPER CHEROKEE SERVICE MANUAL

bearing on the forward plate prior to installing the nut. Use the shortest bolt
which will leave 0.580 of an inch minimum from the fitting to the end of the bolt.
Add washers, AN960-516, as required, (minimum of one), to leave a maximum
of one and one-half visible threads, or minimum of the bolt chamfer exposed
after the nut is torqued.
8. Torque the eighteen main spar bolts to 360 inch pounds. Be certain that
the bolts, nuts and washers are installed in accordance with the bolt legend. The
forward spar attachment bolt should be torqued in accordance with the chart of
recommended torque requirements given in Section II. Torque the rear spar attachment bolt from 200 to 225 pounds.
9. Install the wing jacks and the tail support to the tail skid with approximately 250 pounds of ballast on the base of the tail support. Removethefuselage
cradle and wing supports.
10. If the left wing was removed, it is necessary that the pitot and static
tubes be connected at the elbows located within the cockpit at the wing butt line.
On occasion, one tube may be painted red, denoting the pitot tube. Replace or
install clamps where found necessary.
11. Connect the hydraulic brake line onto the fitting locatedwithin the cockpit at the leading edge of the wing, and the landing gear hydraulic lines at the fittings within the fuselage aft of the spar.
12. Connect the leads to the appropriate posts on the terminal strip and
install the washers and nuts. (For assistance in connecting the electrical leads,
refer to the electrical schematics in Section XI.) Place the clamps along the
electrical harness to secure it in position and install the terminal strip dust cover.
13. Connect the fuel line at the fitting located inside of the wing, by reaching through the access panel on the forward inboard portion of the wheel well.
14. Connect the aileron balance and control cables at the turnbuckles that
are located within the fuselage aft of the spar. After the left balance cable has
been inserted through the bracket assembly and connected, install a cotter pin
cable guard into the hole that is provided in the bracket assembly.
15. Connect the flap by placing the flap handle in the full flap position, place
the bushing on the outside of the rod end bearing, and insert and tighten bolt.
16. Check the rigging and control cable tension of the ailerons and flaps.
(Refer to Rigging and Adjustment of Ailerons, and Rigging and Adjustment of
Flaps, Section V.)
17. Service and refill the brake system with hydraulic fluid in accordance
with Servicing Brake System, Section II. Bleed the system as given in Section
VII and check for fluid leaks.
18. Check the fluid level of the landing gear hydraulic system and fill in
accordance with Servicing Hydraulic Pump/Reservoir, Section II. With the airplane setting on jacks, operate the gear through several retraction and extension
cycles to be certain that there are no hydraulic leaks. Bleed the hydraulic sys-

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PIPER CHEROKEE SERVICE MANUAL

tern in accordance with Section VI.
19. Service and fill the fuel system in accordance with Servicing Fuel
System, Section II. Open the fuel valve and check for leaks and flow.
20. Check the operation of all electrical equipment, pitot and static system s.
21. Remove the airplane from jacks.
22. Install the cockpit trim panel assembly, spar box carpet, the front
and back seats and wing root rubber.
23. Replace all the access plates and panels on the wing involved.
4-16.

EMPENNAGE GROUP.

4-17.

STABILATOR.

4-18.

REMOVAL OF STABILATOR. (Refer to Figure 4-4.)
NOTE
Before entering the aft portion of the fuselage, attach
a stand to the tail skid for support; and with the use of
a heavy pad, protect the inside of the fuselage. Be
certain to distribute weight on top of the bulkheads so
as not to damage the fuselage skin.
NOTE
Should it be necessary to move the rudder to its extreme left or right for clearance, do so with the use of
the rudder pedals or toe bar.

a. PA-28-150,-160,-180,
Serial Nos. 28-1 to 28-2171 incl. and PA-28-235,
Serial Nos. 28-10003 to 28-10605 incl. (The exception being those airplanes with
Piper Kit No. 756 930 or 756 896, Stabilator Trim Modification, installed. Airplanes with either kit installed, refer to step b.)
1. Remove the access panel to the aft section of the fuselage located at the
back wall of the baggage compartment.
2. Install cable blocks, as illustrated in Figure 4-3, on the stabilator trim
control cable at the first set of pulleys forward of the cable turnbuckle to prevent
the forward portion of the cable from unwrapping.

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PIPER CHEROKEE SERVICE MANUAL

982

Figure 4-3.

Methods of Securing Control Cables

3. Disconnect the trim cable at the turnbuckle withinthe aft section of the
fuselage.
4. Relieve tension from the stabilator control cables by loosening one of
the cable turnbuckles in the aft section of the fuselage.
5. Disconnect the stabilator control cables from the stabilator balance arm
by removing cotter pins, nuts, washers, bushings and clevis bolts.
6. Remove the screws from around the upper and lower tail cone fairing
assembly and remove the fairings separately.
7. Disconnect trim indicator cable at trim screw and trim tab control arm
from the trunnion or screw link by removing nut, washers, bushings and bolt.
8. Disconnect the trim assembly from the aft bulkhead of the fuselage by
removing the attaching nuts, washers and bolts of the horizontal and diagonal
support brackets.
9. Move the trim assembly up through the tail cone fairing cutout in the
stabilator, allowing cable to draw out, and tape it to the tail cone out of the way.
10. Remove the stabilator by disconnecting the stabilator at its hinge points
by removing attaching nuts, washers and bolts.
b. PA-28-140; PA-28-150, -160, -180, Serial Nos. 28-2171 and up; PA-28-235, Serial
Nos. 28-10606and up; and PA-28R:
1. Remove the screws from around the upper and lower tail cone fairing
assembly and remove the fairing separately.

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PIPER CHEROKEE SERVICE MANUAL

2. Block the trim cable at the barrel of the trim screw assembly to prevent
the cable from unwrapping.
3. Remove the access panel to the aft section of the fuselage located at the
back wall of the baggage compartment.
4. Install cable blocks, as illustrated in Figure 4-3, on the stabilator trim
control cable at the first set of pulleys forward of the cable turnbuckles to prevent
the forward cable from unwrapping.
5. Disconnect the trim cables at the turnbuckles within the aft section of
the fuselage.
6. Relieve tension from the stabilator control cables by loosening one of
the cable turnbuckles in the aft section of the fuselage.
7. Disconnect the stabilator control cables from the stabilator balance arm
by removing cotter pins, nuts, washers, bushings and clevis bolts.
8. Disconnect the trim indicator cable (overhead trim only) and the tab
control arm connecting links from the trim screw by removing nut, washers,
bushings and bolts.
9. Disconnect the trim assembly from the aft bulkhead of the fuselage by
removing the attaching nuts, washers and bolts of the horizontal and diagonal
support brackets.
10. Move the trim assembly up through the tail cone fairing cutout in the
stabilator and remove, with cable, from the airplane.
11. Remove the stabilatorby disconnectingthe stabilator at its hinge points
by removing attaching nuts, washers and bolts.
4-19.

INSTALLATION OF STABILATOR. (Refer to Figure 4-4.)
NOTE

A clearance of .25 + .06 of an inch between the stabilator and the side of the fuselage and .18 of an inch
minimum between all parts of the stabilator and the
tail cone assembly must be maintained throughout the
stabilator travel. Use a proper washer combination
on the stabilator hinges to attain the necessary tolerances.
a. PA-28-150,-160,-180,
Serial Nos. 28-1 to 28-2171 incl. and PA-28-235,
Serial Nos. 28-10003 to 28-10605 incl. (The exception being those airplanes with
Piper Kit No. 756 930 or 756 896, Stabilator Trim Modification, installed. Airplanes with either kit installed, refer to step b.)
1. Insert the stabilator in position and install attaching hinge bolts, washers
and nuts.

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PIPER CHEROKEE SERVICE MANUAL

2. Move the trim assembly through the cutout in the stabilator and attach the
brackets of the assembly to the aft bulkhead with bolts, washers and nuts. Draw the trim
cable around the idler pulley and trim drum, and insert the cable end into the fuselage.
3. Attach the stabilator control cables to the stabilator balance arm with clevis
bolts, bushings, washers,nuts and cotter pins.
4. Connect the fore and aft end of the trim cable at the turnbuckle within the aft
section of the fuselage.
5. Removethe cable blocks from the trim control cable.
6. Set stabilator control cable tension and check riggingand adjustment according
to Riggingand Adjustment of Stabilator, Section V.
7. Set stabilator trim control cable tension and check rigging and adjustment
according to instructions in Section V. During this procedure, connect the trim indicator
cable and tab control arm to the trim screw trunnion or links with bolt, washers,bushings
and nut. Insure that the tab attachment bolt head is on the side next to the trim indicator
cable to insure no interference with indicator cable.
8. Remove the pad from the aft section of the fuselage and replace the access
panel.
9. Install the tail cone fairingand remove tail stand.
b. PA-28-140; PA-28-150, -160, -180, Serial Nos. 28-2171and up; PA-28-235, Serial
Nos. 28-10606and up; and PA-28R:
1. Insert the stabilator in position and install attaching hinge bolts, washersand
nuts.
2. Move the trim assembly through the cutout in the stabilator and attach the
brackets of the assembly to the aft bulkhead with bolts, washersand nuts. Insert the trim
cable ends into the fuselage.
3. Attach the stabilator control cables to the stabilator balance arm with clevis
bolts, bushings,washers,nuts and cotter pins.
4. Connect the ends of the fore and aft trim cables at the turnbuckles within the
aft section of the fuselage.
5. Remove the cable block from the trim control cable within the fuselage.
6. Set stabilator control cable tension and check riggingand adjustment according
to Riggingand Adjustment of Stabilator, Section V.
7. Remove the cable blocks from the trim cable at the barrel of the trim screw
assembly.
8. Set stabilator trim control cable tension and check rigging and adjustment
according to instructions in Section V. During this procedure, connect the trim indicator
cable (overhead trim only) and the tab control arm to the trim screw, with the connecting
links of the control arm, with bolt, bushings, washers and nut. Insure that the tab
attachment bolt head is on the side next to the trim indicator cable to insure no interference
with indicator cable.
9. Remove the pad from the aft section of the fuselage and replace the access
panel.
10. Install the tail cone fairingand remove tail stand.

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1H10
INTENTIONALLY LEFT BLANK

PIPERCHEROKEESERVICEMANUAL
C335
1791

SKETCHA

SKETCHB

908

908

868
907

SKETCHC
Al16

SKETCHF
SKETCHE

A109

BOLT AN3-11
NUT AN310-3

BOLT AN3-5A
WASHER
AN960-10L
4 REQ.

SKETCHD
Figure 4-4. EmpennageGroup Installation

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PIPER CHEROKEE SERVICE MANUAL

4-20. STABILATORTRIMTAB.
4-21. REMOVALOF STABILATORTRIM TAB. (Refer to Figure 4-4.)
a. Disconnect the stabilator trim control rod by removing the bolts that attach the
control rod to the stabilator trim tab.
b. Remove the stabilator trim hinge pins by cutting one end of the wire pins and
removing.
c. The stabilator trim tab can now be removed.
4-22. INSTALLATIONOF STABILATORTRIM TAB. (Refer to Figure 4-4.)
a. Place the trim tab in position on the aft end of the stabilator.
b. Insert new pins and secure by bending the end to a 45 degreeangle.
c. Install the control rod and attach with the four bolts and washers.
4-23. RUDDER.
4-24. REMOVALOF RUDDER.
a. Remove the screwsfrom around the upper tail cone fairing assemblyand remove the
fairing.
b. Remove the rudder tip by removing the attaching screws and disconnect the tail
position light wire at the quick disconnect located at the tip of the rudder. Open the access
panel in the rear of the baggage compartment to gain access to the aft section of the
fusleage.
c. Relieve the cable tension from the rudder control system by loosening one of the
cable turnbuckles in the aft section of the fuselage.
d. Disconnect the two control cables from the rudder horn by removing the cotter
pins, nuts, washers,bushingsand bolts.
e. Remove the cotter pins, nuts, washers and bolts from the upper and lower rudder
hinge pivot points.
f. Pull the rudder up and aft from the vertical fin.
4-25. INSTALLATIONOF RUDDER. (Refer to Figure 4-4.)
a. Place the rudder in position and install the hinge bolts, washers,nuts and cotter pins.

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PIPER CHEROKEE SERVICE MANUAL

NOTE
Use any washer combination of the hinge assembly to
suit best the centering and operation of the rudder.
b. Connect the tail position light electrical lead at the quick disconnect and
cover the connector with an insulating sleeve. Tie both ends of the sleeve with
number six electrical lacing twine.
c. Connect the control cables to the rudder horn with bolts, washers, nuts and
cotter pins.
d. Check the rudder in accordance with Rigging and Adjustment of Rudder,
Section V.
e. Install the upper tail cone fairing and rudder tip and secure with the attachment screws. Secure the access panel to the aft section of fuselage.
4-26.

VERTICAL FIN.

4-27. REMOVAL OF VERTICAL FIN.
a. Remove the screws from the upper and lower tail cone fairing, the fin tip
cover and the fairing at the forward base of the fin.
b. Remove the rudder per instructions given in Paragraph 4-24.
c. Disconnect the leads from the antenna terminals (optional) and attach a line
to the leads to assist in reinstallation.
d. Disconnect the wire antenna (optional) that attaches to the leading edge of
the fin.
e. Disconnect the positive lead to the rotating beacon (optional) and attach a
line prior to removal. Disconnect the ground lead by removing the attachment
screw.

f. Remove the stabilator trim assembly and aft trim cable in accordance with
Removal of Stabilator Trim Assembly (Aft), Section V.
g. Remove the bolt and washer that attaches the leading edge of the fin to the
fuselage.
h. Remove the nuts, washers and bolts that secure the fin spar to the aft bulkhead and remove the vertical fin.
4-28. INSTALLATION OF VERTICAL FIN.
a. Insert the vertical fin into position and install the bolts, washers and nuts
that secure the fin spar to the aft bulkhead.
b. Install the bolt and washer that attaches the leading edge of the fin to the

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PIPER CHEROKEE SERVICE MANUAL

fuselage.
c. Install the stabilator trim assembly and aft trim cable per instructions
given in Installation of Stabilator Trim Assembly, Section V.
d. Install the rudder per paragraph 4-25.
e. Pull the electrical and antenna leads through the vertical fin with the line
that was attached.
f. Connect the antenna leads to the proper terminals and secure with washers
and nuts.
g. Connect the electrical leads at the disconnects and insulate.
h. Rig and adjust the rudder and trim control cables as given in Section V.
i . Check the operation of the radios and electrical lights.
j . Replace all fairings and access plates, and secure with attaching screws.
4-29.

FUSELAGE ASSEMBLY.

4-30.

WINDSHIELD.

4-31. REMOVAL OF WINDSHIELD.
a. Remove the collar molding from around the bottom of the windshield and the
trim strip from between the windshield halves by removing the attaching screws.
b. Remove the windshield by raising the lower portion of the windshield and
carefully pulling it out and downward to release the top and side edges.
NOTE
A damaged windshield should be saved since it can be
used as a pattern for drilling required holes in the new
windshield.
c. Clean the old tape and sealer from the windshield channels,
vider post.

strips and di-

4-32. INSTALLATION OF WINDSHIELD. (Refer to Figure 4-5.)
a. Be certain that thenew windshield outside contours are the same as that of
the old windshield. It may be found that it is necessary to cut or grind the new
windshield to acquire the proper dimensions.
b. Apply black vinyl plastic tape around the outer edges of the entire windshield.

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PIPER CHEROKEE SERVICE MANUAL

390

955

963
WHITE

WHITE

WHITE

SEALANT

SEALANT
:I

VINYL

FOAM TAPE

VINYL
BLACK

- BLACK

1800

966

898

WHITE
SEALANT

WHITE
SEALANT

VINYL
BLACK
VINYL TAPE

BLACK
VINYL TAPE
BLACK
VINYL TAPE

F.F

Figure 4-5. WindshieldInstallation (Typical)

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PIPER CHEROKEE SERVICE MANUAL

c. Apply Behr-Manningvinyl foam tape number 560 or equivalent over the plastic tape, completely around the edges of the windshield.
d. Apply Behr-Manning sealant number PRC 5000 or equivalent under the edge
of the moldings and trim strips.
e. Place the windshield in position for installation and slide the windshield aft
and up into place, using caution not to dislocate the tape around the edges. Allow
clearance between the two windshields at the divider post for expansion.
f . Lay sealant at the bottom and center (inboard) of the windshield in the hollow between the outside edge and channel.
g. Lay a small amount of sealant under the center trim strip, install and secure.
h. Lay black vinyl tape on the underside of the collar molding, install and secure.
i . Seal with sealant any areas around windshield that mayallow water to penetrate past the windshield.
j . Remove excess exposed sealer to tape.

4-33.

SIDE WINDOWS.

4-34. REMOVAL OF SIDE WINDOWS. PA-28 airplanes are equipped witha single pane side windows, the exception being the PA-28-235, Serial Nos. 28-10720 to
28-7210033 inclusive, which are installed with double pane side windows. For removal of
both types of windows, the following instructions may be used:
a. Single Panel.
1. Remove the retainer molding from around the window by removing the
attachment screws.
2. Carefully remove the window from the frame.
NOTE
A damaged window should be saved to provide a pattern
for shaping the new window.

3. Remove excess tape and sealer from the window frame and molding.
b. Double Pane.
1. Remove the trim and retainer moldings from around the window by removing the attachment screws.
2. Carefully remove the window from the frame.

Issued: 9 1 68

1H17
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PIPER CHEROKEE SERVICE MANUAL

C337

980

INNER PANE
(LIGHT GAUGE)
OUTER PANE
(HEAVY GAUGE)

WHITE SEALANT

WHITE SEALANT

VINYL FOAM TAPE

ADHESIVE SPONGE
RUBBER

Figure 4-6. Side Window Installation,
Single Pane (Typical)

Figure 4-7. Side Window Installation,
Double Pane (Typical)

NOTE
A damagedwindow should be saved to provide a pattern
for shaping the new window.
3. Remove excess tape and sealer from the window frame.
4-35. INSTALLATION OF SIDE WINDOWS.
a. Single Pane. (Refer to Figure 4-6.)
1. Cut or grind the new window to the same dimension as the window removed.
2. Apply Behr-Manning vinyl foam tape number 560 or equivalent, on both
sides of the window around the outer edges.
3. Apply Behr-ManningSealant number PRC 5000 or equivalent, completely
around the outer surface of the windows at all attachment flanges.
4. Insert the window in the frame and install the retainer moldings.
5. Secure the molding with attachment screws and tighten until the vinyl
foam tape is 25% compressed by the retainers.
6. Remove the excess exposed sealer and tape.
b. Double Pane. (Refer to Figure 4-7.)
1. Cut or grind the new window to the same dimension as the window removed.
2. Apply Raybestos R-15 black #565C sponge rubber adhesive or equiva-

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STRUCTUR ES
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PIPER CHEROKEE SERVICE MANUAL

lent, between the edges of the outer (heavy gauge)and inner (light gauge)windows, prior to
installation.
3. Apply Behr-Manning sealant number PRC 5000 or equivalent, completely
around the outer surface of the attachment flanges.
4. Insert the window assemblyin the frame and install the retainer moldings.
5. Secure the window and retainer moldings in position by installing the
attachment screws.
6. Install the trim moldings and attachment screws.
7. Remove the excess exposed sealer from around the window.
4-36. DOOR (ENTRANCE).
4-37.
a.
b.
c.

REMOVALOF DOOR.
Remove the clevisbolt, washer and bushing from the door holder assembly.
Removecotter pins, clevispins and washersfrom serrated door hinges.
Remove the door from the airplane.

4-38. INSTALLATIONOF DOOR.
a. Insert the door into position and install the washers, clevis bolts and cotter pins on
the door hinges.
b. For adjustment of door, refer to Paragraph4-39.
c. Hook up and install the clevis bolt, bushing and washer into the door holder
assembly.
4-39. ADJUSTMENTOF DOOR.
a. To acquire the proper vertical adjustment of the door, insert the necessary washer
combination between the cabin door hinge and fuselagebracket assembly.
b. Additional adjustments may be made by tapping out the serrated door hinge,
bushings and rotating them to obtain the hinge centerline location that will provide proper
door fit.
c. To insure long life of door seals and improve sealing characteristics, it is
recommended they be lubricated with a fluorocarbon or similar dry lubricant in a spray can.
4-40. REMOVALOF DOOR LATCHMECHANISM
a. Remove the door latch mechanism by removing the door trim upholstery and the
screwsthat attach the latch plate and latch mechanismto the door.
b. Disconnect the latch pull rod from the inside door handle.
c. Remove the complete latch mechanism.

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PIPER CHEROKEE SERVICE MANUAL
4-41. REMOVALAND INSTALLATIONOF DOOR SEAL SNUBBERS. (Refer to Figure 4-8.)
A. To remove old seals use a thinner, such as toluol. that won't affect the painted surface, and strip off
the old seal.
B. Install the door seal as follows:
1. If the surface has just been painted. allow to dry for a minimum of 2 hours before installing the
seal.
2. Wipe the surface clean with a cleaner solvent. such as DuPont Prep-Sol 3919S.
-NOTE

-

Refer to the List of ConsumableMaterialsfor types of
appropriate neopreneadhesive.
3. Make sure both the seal and surface are 65° to 100°F.
4. Adhesive should only be applied to that area to be covered by the seal. If necessary. tape off the
affected area. The adhesive can be thinned as required with toluol. Apply adhesive in a continuous coat of.002
to .010 of an inch thick.
5. Apply a continuous coat of adhesive of the same thickness to the seal.
6. With the adhesive applied to the mating surface and seal. allow them to cure 30 to 60 min. apart
before bonding them in place.
7. With reference to Figure 4-8, make sure the seal is properly aligned before allowing the
surfaces to come in contact. The seal should not be stretched or pulled such that the cross section of the seal is
reduced or distorted. Make sure the door closes properly and that an airtight seal is produced.
8. After positioning the seal. apply pressure to remove air bubbles and assure firm contact.
B95S

DO NOT STRETCH SNUBBER
AROUND CORNERS (TYP)
ORIENT SNUBBER FLAT
WITH THIS SURFACE

FIGURE 1
VIEW LOOKING INBOARD
R.H. SIDE
ADHESIVE

C
I-

STRIKER PLATE

SECTION C-C

Figure4-8. Door Snubber Installation

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4-42. INSTALLATION OF DOOR LATCH MECHANISM.
a. Place the latch assembly into position on the door.
b. Connect the latch pull rod to the inside door handle.
c. Replace the screws that attach the latch plate and mechanism to the door.
Install the door trim upholstery and secure with screws.
4-43. ADJUSTMENT OF DOOR LATCH MECHANISM. To adjust the door latch,
loosen the screws on the striker plate, make necessary adjustment, and retighten
the screws.
4-44. REMOVAL OF DOOR LOCK ASSEMBLY.
a. Remove the door trim upholstery by removing the attachment screws.
b. Loosen the nut on the lock assemblyand remove the lock by turning it sideways.

4-45. INSTALLATION OF DOOR LOCK ASSEMBLY.
a. Install the lock in the door by turning it sideways and placing it through the
opening provided.
b. Replace the nut on the back of the lock assembly and tighten.
c. Replace the door trim upholstery and secure with the attachment screws.

4-46. REMOVAL OF DOOR SAFETY LATCH.
a. PA-28-150, -160,-180 Serial Nos. 28-1 to 28-990 incl:
1. Remove the latch assembly by removing the two knobs and the small
trim plate at the aft end of the latch.
2. Remove the two screws from the inside trim plate and remove the plate.
3. Remove the latch assembly from the door.
b. PA-28-140; PA-28-150, -160, -180, Serial Nos. 28-991 and up; PA-28-235 and
PA-28R:
1. Remove the two handles and the five screws holding the pan on the inside
of the door.
2. Remove the pane and pull the latch assembly through the openingon the
door.

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PIPER CHEROKEE SERVICE MANUAL

4-47. INSTALLATION OF DOOR SAFETY LATCH
a. PA-28-150, -160, -180 Serial Nos. 28-1 to 28-990 incl:

1. Place the latch assembly into position for installation.
2.

Install

the small trim plate on the aft end of the door and on the inside

of the door. Secure in place with the attachment screws.
3. Replace the knobs and tighten. Check latch for proper operation and
that the knobs are free of rubbing on the trim panels.
b. PA-28-140; PA-28-150,-160,-180 Serial Nos. 28-991 and up; PA-28-235
and PA-28R:
1. Place the latch assembly into position for installation.
2. Replace the pan and install the five screws and handles.
3. Check the latch assembly for operation and be certain that it is free of
rubbing on the trim panels.

4-48. ADJUSTMENT OF DOOR SAFETY LATCH. (PA-28-140;PA-28-150,-160,-180,
Serial Nos. 28-991and up; PA-28-235and PA-28R.)
a. To adjust the door safety latch remove the two screws from latch plate found
at the top of the door opening.
b. Remove the plate and turn the loop assembly in or out to make necessary
adjustments.
c. Replace the latch plate and secure with the two attachment screws.
4-49.

BAGGAGEDOOR.

4-50. REMOVAL OF BAGGAGEDOOR. With the dooropen removethehinge
from the hinge and remove the door.

pin

4-51. INSTALLATION OF BAGGAGEDOOR. Place the door in position so that
the hinge halves are properly matched and install the hinge pin. It will not be
necessary to replace the hinge pin with a new pin if it is free of bends and wear.

4-52. REMOVAL OF BAGGAGEDOOR LOCK ASSEMBLY.
a. With the door open remove the nut from the back of the lock assembly by
use of a special made wrench. (This tool may be fabricated from the dimensions
given in Figure 4-24.)
b. Remove the lock assembly through the front of the door.

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PIPER CHEROKEE SERVICE MANUAL

4-53. INSTALLATIONOF BAGGAGEDOOR LOCKASSEMBLY.
a. Place the lock into position for installation.
b. Install the nut on the lock assemblyand tighten with the use of a special wrench.
4-54. REMOVALOF BAGGAGEDOOR HINGE.
a. Remove the door from the airplane as described in Removal of BaggageDoor,
Paragraph4-49.
b. Remove the hinge half from the airplane or door by drilling out the rivets and
removing the hinge.
4-55. INSTALLATIONOF BAGGAGEDOOR HINGE.
a. Placethe hinge halvestogether and install the hinge pin.
b. Install the door into the closed position and drill the two end rivet holes and install
the rivets.
c. Operate the door and check for proper fit and installation. Drill the remainingholes
and install the rivets.
4-56. RIGGINGINSTRUCTIONS- SEAT BACKLOCKAND RELEASE.(Refer to Figure
4-9.)
a. Loosen screws (1 and 2) and ascertain that clamps (3 and 4) are in a relaxed
condition. (Push-pull cable (6) is able to move within the clamps.)
b. Place a straightedge along the lower surface of bushing (5) of the seat back release.
c. Adjust the push-pull cable (6) by raisingor loweringit until the lower surface of the
stop assembly(7) is parallel to the straightedge.
d. Secure the push-pull cable in this position by tightening screws(1 and 2) on clamps
(3 and 4). The stop (7) should be lubricated and free to swivelwithout excessiveplay.
e. Push on seat back with stop assembly (7) in an engaged position to check
engagement. Rotate the seat back release handle and check for disengagementof seat back.

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PIPER CHEROKEE SERVICE MANUAL

A282

SCREW
SCREW
CLAMP
CLAMP
BUSHING
CABLE
STOP ASSY.

AND FREE
STOP SHOULD BE LUBRICATED
TO SWIVEL WITHOUT EXCESSIVE PLAY

STRAIGHTEDGE

Figure 4-9. Seat Back Lock

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1H24

STRUCTURES

a

0

o

0

PIPER CHEROKEE SERVICE MANUAL
LEFT, BOTTOM

C33B

SEE NOTE 5

SEE NOTE 4

1 2

2

SEE NOTE 6
SEE NOTE 6

3

3,4

5

PA-28-140,-150,-160,-180

SEE NOTE 3

6

7

6

7

3

5

235
AND 23

LEFT, TOP

5

3
SEE

NOTE 3

8

3

SEE NOTE 5

4

3

1,2

SEE NOTE 4 1

LEFT, BOTTOM

PA-2 8 R ONLY
2

3
3

5

3

8

5

5

LEFT,

TOP

5

6

7

5

5

I

13

I

4

Figure 4-10. Skin Materialsand Thickness(cont.)
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PIPER CHEROKEESERVICE MANUAL
4-57. STRUCTURAL REPAIRS. Structural repair methods used may be made in accordance
with the regulations set forth in Federal Aeronautics Manual 18 or FAA Advisory Circular
43.13-1A. To assist in making repairs, Figure 4-10 identifies the type and thickness of skin
structure used. Never make a skin replacement or patch from a material thinner than the original
skin. Original material and thickness is recommended and must result in a surface which is as
strong as, or stronger than, the original skin. However, flexibility must be retained so that the
surrounding areas will not receive extra stress.
When making major structural repairs, other than using factory manufactured parts, it is
recommended the manufacturer be contacted. No major alterations are recommended without
contacting the manufacturer.
4-57a. BAGGAGE COMPARTMENT INSPECTION HOLE AND COVER PLATE.
If baggage compartment inspection holes are not already installed, see Paragraph 4-79 for
installation details.
4-58. FIBERGLAS REPAIRS. The repair procedure in this manual will describe the methods
for repair of fiberglas reinforced structures. Paragraph 4-59 describes Fiberglas Touch-Up and
Surface Repairs such as blisters, open seams, delamination, cavities, small holes and minor
damages that have not harmed the fiberglas cloth material. Paragraph 4-60 describes Fiberglas
Fracture and Patch Repairs as puncture, breaks and holes that have penetrated through the structure
and damaged the fiberglas cloth. A repair kit, part number 756 729 will furnish necessary material
for such repairs, is available through Piper Aircraft Dealers.
NOTE
Very carefully follow resin and catalyst mixing instructions furnished with repair kit.

4-59. FIBERGLAS TOUCH-UP AND SURFACE REPAIRS.
a. Remove wax, oil and dirt from around the damaged area with acetone, Methylethylketone
or equivalent and remove paint to gel coat.
b. The damaged area may be scraped with a fine blade knife or a power drill with a burr
attachment to roughen the bottom and sides of the damaged area. Feather the edge surrounding the
scratch or cavity. Do not undercut the edge. (If the scratch or cavity is shallow and penetrates only
the surface coat, continue to step h.)
c. Pour a small amount of resin into ajar lid or on a piece of cardboard, just enough to fill the
area being worked on. Mix an equal amount of milled fiberglas with the resin, using a putty knife
or stick. Add catalyst, according to kit instruction, to the resin and mix thoroughly. A hypodermic
needle may be used to inject gel into small cavities not requiring fiberglas millings mixed with the
gel.

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d. Work the mixture of resin, fibers and catalyst into the damaged area, using
the sharp point of a putty knife or stick to press it into the bottom of the hole and
to puncture any air bubbles which may be present. Fill the scratch or hole above
the surrounding undamaged area about 1/16 inch.
e. Lay a piece of cellophane or waxed paper over the repair to cut off air and
start the cure of gel mixture.
f. Allow the gel to cure 10 to 15 minutes until it feels rubbery to the touch.
Remove the cellophane and trim flush with the surface, using a sharp razor blade
or knife. Replace the cellophane and allow to cure completely for 30 minutes to
an hour. The patch will shrink slightly below the structure surface as it cures.
(If wax paper is used, ascertain wax is removed from surface.)
g. Rough up the bottom and edges of the holewith the electric burr attachment
or rough sand paper. Feather hole into surrounding gel coat, do not undercut.
h. Pour out a small amount of resin, add catalyst and mix thoroughly, using
a cutting motion rather than stirring.
Use no fibers.
i . Using the tip of a putty knife or finger tips, fill the hole at about 1/16 inch
above the surrounding surface with the gel coat mixture.
j . Lay a piece of cellophane over the patch to start the curing process. Repeat step f, trimming patch when partially cured.
k. After trimming the patch, immediately place another small amount of gel
coat on one edge of the patch and cover with cellophane. Then, using a squeegee
or the back of a razor blade, squeegee level wtih area surrounding the patch,
leave the cellophane onpatch for one or two hours or overnight, for complete cure.
1 . After repair has cured for 24 hours, sand patched the area using a sanding
block with fine wet sandpaper. Finish by priming, again sanding and applying
color coat.

4-60. FIBERGLAS FRACTURE AND PATCH REPAIRS.
a. Remove wax, oil and dirt from around damaged area with acetone, methylethylketone or equivalent.
b. Using a key hole saw, electric saber saw, or sharp knife cut away ragged
edges. Cut back to sound material.
c. Remove paint three inches back from around damaged area.
d. Working inside the structure, bevel the edges to approximately a 30 degree
angle and rough-sand the hole and the area around it, using 80-grit dry paper.
Feather back for about two inches all around the hole. This roughens the surface
for strong bond with patch.
e. Cover a piece of cardboard or metal with cellophane. Tape it to the outside of the structure covering the hole completely. The cellophane should face
toward the inside of the structure. If the repair is on a sharp contour or shaped

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area, a sheet of aluminum formed to a similar contour may be placed over the
area. The aluminum should also be covered with cellophane.
f . Prepare a patch of fiberglas matand cloth to cover an area two inches larger
than the hole.
g. Mix a small amount of resin and catalyst, enough to be used for one stepat
a time, according to kit instructions.
h. Thoroughlywetmat andcloth withcatalyzedresin.
Daub resin on mat first,
and then on cloth. Mat should be applied against structures surface with cloth on
top. Both pieces may be wet out on cellophane and applied as a sandwich. Enough
fiberglas cloth and mat reinforcements should be used to at least replace the
amount of reinforcements removed in order to maintain the original strength. If
damage occurred as a stress crack, an extra layer or two of cloth may be used
to strengthen area.
i. Lay patch over hole on inside of structure, cover with cellophane, and
squeegee from center to edges to remove all air bubbles and assure adhesion
around edge of hole. Air bubbles will show white in the patch and they should all
be worked out to the edge. Remove excess resin before it gels on the part. Allow patch to cure completely.
j . Remove cardboard or aluminum sheet from outside of hole and rough-sand
the patch and edge of hole. Feather edge of hole about two inches into undamaged
area.
k. Mask area around hole with tape and paper to protect surface. Cut a piece
of fiberglas mat about one inch larger than the hole and one or more pieces of
fiberglas cloth two inches larger than the hole. Brush catalyzed resin over hole,
lay mat over hole and wet out with catalyzed resin. Use a daubing action with
brush. Then apply additional layer or layers of fiberglas cloth to build up patch
to the surface of structure.
Wet out each layer thoroughly with resin.
1 . With a squeegee or broad knife, work out all air bubbles in the patch. Work
from center to edge, pressing patch firmly against the structure. Allow patch to
cure for 15 to 20 minutes.
m. As soon as the patch begins to set up, but while still rubbery, take a sharp
knife and cut away extra cloth and mat. Cut on outside edge of feathering. Strip
cut edges of structure.
Do this before cure is complete, to save extra sanding.
Allow patch to cure overnight.
n. Using dry 80 grit sandpaper on a power sander or sanding block, smooth
patch and blend with surrounding surface. Should air pockets appear while sanding, puncture and fill with catalyzed resin. A hypodermic needle may be used to
fill cavities. Let cure and resand.
o. Mix catalyzed resin and work into patch with fingers. Smooth carefully and
work into any crevices.
p. Cover with cellophane and squeegee smooth. Allow to cure completely before removing cellophane. Let cure and resand.

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q. Brush or spray a coat of catalyzed resin to seal patch. Sand patch, finish by priming,
again sanding and applying color coat.
NOTE
Brush and hands may be cleaned in solvents such as acetone
or methylethylketone. If solvents are not available, a strong
solution of detergent and water may be used.
4-61. THERMOPLASTIC REPAIRS. The following procedure will assist in making field
repairs to items made of thermoplastic which are used throughout the airplane. A list of
material needed to perform these repairs is given along with suggested suppliers of the
material. Common safety precautions should be observed when handling some of the
materials and tools used while making these repairs.
a. Surface Preparation:
1. Surface dirt and paint if applied must be removed from the item being repaired.
Household cleaners have proven most effective in removing surface dirt.
2. Preliminary cleaning of the damaged area with perchlorethylene or VM&P
Naptha will generally insure a good bond between epoxy compounds and thermoplastic.
b. Surface Scratches, Abrasion or Ground-in-Dirt: (Refer to Figure 4-11.)
1. Shallow scratches and abraded surfaces are usually repaired by following directions on containers of conventional automotive buffing and rubbing compounds.
2. If large dirt particles are embedded in thermoplastic parts, they can be removed
with a hot air gun capable of supplying heat in the temperature range of 300° to 400° F. Use
care not to overheat the material. Hold the nozzle of the gun about 1/4 of an inch away from
the surface and apply heat with a circular motion until the area is sufficiently soft to remove
the dirt particles.
3. The thermoplastic will return to its original shape upon cooling.
c. Deep Scratches, Shallow Nicks and Small Holes: (Less than 1 inch in diameter.)
(Refer to Figure 4-12.)
1. Solvent cements will fit virtually any of these applications. If the area to be repaired is very small, it may be quicker to make a satisfactory cement by dissolving thermoplastic material of the same type being repaired in solvent until the desired paste-like consistency is achieved.
2. This mixture is then applied to the damaged area. Upon solvent evaporation, the
hard durable solids remaining can easily be shaped to the desired contour by filing or sanding.
3. Solvent adhesives are not recommended for highly stressed areas, on thin walled
parts or for patching holes greater than 1/4 inch in diameter.
4. For larger damages an epoxy patching compound is recommended. This type
material is a two part, fast curing, easy sanding commercially available compound.
5. Adhesion can be increased by roughing the bonding surface with sandpaper and
by utilizing as much surface area for the bond as possible.
6. The patching compound is mixed in equal portions on a hard flat surface using a
figure eight motion. The damaged area is cleaned with perchlorethylene or VM&P Naptha
prior to applying the compound. (Refer to Figure 4-13.)
7. A mechanical sander can be used after the compound is cured, providing the
sander is kept in constant motion to prevent heat buildup.

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8. For repairs in areas involving little or no shear stress, the hot melt adhesives,
polyamids which are supplied in stick form may be used. This type of repair has a low cohesive
strength factor.
9. For repairs in areas involving small holes, indentations or cracks in the material
where high stress is apparent or thin walled sections are used, the welding method is suggested.

TABLE IV-I. LIST OF MATERIALS (THERMOPLASTIC
ITEMS

DESCRIPTIONS

REPAIR)
SUPPLIERS

Automotive Type DuPont #7

DuPont Company
Wilmington, Del. 19898

Ram Chemical #69 x 1

Ram Chemicals
Gardena, Cal. 90248

Mirror Glaze #1

Mirror Bright Polish Co.,
Inc.
Irvin, Cal. 92713

Cleaners

Fantastic Spray
Perchlorethylene
VM&P Naptha (Lighter
Fluid)

Obtain From Local
Suppliers

ABS-Solvent Cements

Solarite #11 Series

Solar Compounds Corp.
Linden, N.J. 07036

Solvents

Methylethyl Ketone
Methylene Chloride
Acetone

Obtain From Local
Suppliers

Epoxy Patching
Compound

Solarite #400

Solar Compounds Corp.
Linden, N.J. 07036

Hot Melt Adhesives
Polyamids and Hot Melt
Gun

Stick Form 1/2 in. dia.
3 in. long

Sears Roebuck & Co.
or Most Hardware Stores

Hot Air Gun

Temp. Range 300 ° to
400° F

Local Suppliers

Buffing and Rubbing
Compounds

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871

Figure 4-11., Surface Scratches, Abrasions or Ground-in-Dirt
10. This welding method requires a hot air gun and ABS rods. To weld, the gun should
be held to direct the flow of hot air into the fusion (repair) zone, heating the damaged area and
rod simultaneously. The gun should be moved continuously in a fanning motion to prevent
discoloration of the material. Pressure must be maintained on the rod to insure good adhesion.
(Refer to Figure 4-14.)
11. After the repair is completed, sanding is allowed to obtain a surface finish of
acceptable appearance.
d. Cracks: (Refer to Figure 4-15.)
1. Before repairing a crack in the thermoplastic part, first determine what caused the
crack and alleviate that condition to prevent it recurring after the repair is made.
2. Drill small stop holes at each end of the crack.
3. If possible, a double plate should be bonded to the reverse side of the crack to
provide extra strength to the part.
4. The crack should be "V" grooved and filled with repair material, such as solvent
cement, hot melt adhesive, epoxy patching compound or hot air welded, whichever is
preferred.
5. After the repair has cured, it may be sanded to match the surrounding finish.
e. Repairing Major Damage: (Larger than 1 inch in diameter.) (Refer to Figure 4-16.)
1. If possible, a patch should be made of the same material and cut slightly larger
than the section being repaired.
2. When appearances are important, large holes, cracks, tears, etc., should be
repaired by cutting out the damaged area and replacing it with a piece of similar material.
3. When cutting away the damaged area, under cut the perimeter and maintain a
smooth edge. The patch and/or plug should also have a smooth edge to insure a good fit.

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871

Figure 4-12. Deep Scratches, Shallow Nicks and Small Holes
826

THOROUGHLY MIX
USING FIGUREEIGHT
MOTION.

Figure 4-13. Mixing of Epoxy Patching Compound

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PIPER CHEROKEE SERVICE MANUAL
4. Coat the patch with solvent adhesive and firmly attach it over the damaged area.
5. Let the patch dry for approximately one hour before any additional work is
performed.
6. The hole, etc., is then filled with the repair material. A slight overfilling of the
repair material is suggested to allow for sanding and finishing after the repair has cured. If
patching compound is used the repair should be made in layers, not exceeding a 1/2 inch in
thickness at a time, thus allowing the compound to cure and insuring a good solid buildup of
successive layers as required.
f. Stress Lines: (Refer to Figure 4-17.)
1. Stress lines produce a whitened appearance in a localized area and generally
emanate from the severe bending or impacting of the material. (Refer to Figure 4-18.)
2. To restore the material to its original condition and color, use a hot air gun or
similar heating device and carefully apply heat to the affected area. Do not overheat the
material.
g. Painting the Repair:
1. An important factor in obtaining a quality paint finish is the proper preparation
of the repair and surrounding area before applying any paint.
2. It is recommended that parts be cleaned prior to painting with a commercial
cleaner or a solution made from one-fourth cup of detergent mixed with one gallon of water.
3. The paint used for coating thermoplastic can be either lacquers or enamels depending on which is preferred by the repair facility or customer. (See NOTE.)
NOTE
It is extremely important that solvent formulations be considered when selecting a paint, because not all lacquers or
enamels can be used satisfactorily on thermoplastics. Some
solvents used in the paints can significantly affect and degrade
the plastic properties.
4. Another important matter to consider is that hard, brittle coatings that are usually
best for abrasion resistance should not be used in areas which incur high stress, flexing or
impact. Such coating may crack, thus creating a weak area.
4-62. A.B.S. THERMOPLASTIC LANDING GEAR WHEELS AND STRUT FAIRING
REPAIR INSTRUCTIONS. Instructions covering the wheel and strut fairing is contained
in a special Wheel and Strut Fairing Repair Instruction Manual, P/N 761 708V. This manual
is obtainable from Vero Beach Service and Sales Department, Piper Aircraft Corporation,
Vero Beach, Florida 32960.

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B70

I

Figure 4-14. Welding Repair Method
827

DOUBLERPLATE

TO

HOLES

Figure 4-15. Repairing of Cracks

Revised: 10 3 83

1I11

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PIPER CHEROKEE SERVICE MANUAL

831

830

828
DAMAGED

AREA

I

Figure 4-16. Various Repairs

1112

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PIPER CHEROKEE SERVICE MANUAL

827

STRESS
LINES

Figure 4-17. Repair of Stress Lines
829

PROFILE VIEW INDICATING
DAMAGED AREA

Figure 4-18. Repair of Impacted Damage

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PIPER CHEROKEE SERVICE MANUAL
4-63. SAFETY WALKREPAIR.
4-64. SURFACEPREPARATIONFOR LIQUID SAFETY WALK.
a. Clean all surfaces with a suitable cleaning solvent to remove dirt, grease and oils.
Solvents may be applied by dipping, spraying or mopping.
b. Insure that no moisture remains on the surface by wiping with a clean cloth.
c. Outline the area to which the liquid safety walk compound is to be applied, and
mask adjacent surfaces.
NOTE
Newly painted surfaces, shall be allowed to dry for 2.5 hours
minimum prior to the application of the safety walk.
4-65. PRODUCTLISTINGFOR LIQUID SAFETY WALKCOMPOUND.
a. SuggestedSolvents:
Safety Solvent per MIL-S-18718
Sherwin WilliamsLacquer Thinner R7KC120
Glidden Thinner No. 207
b. Safety Walk Material:
WalkwayCompound and matting nonslip
(included in Piper Part No. 179872.)
4-66. APPLICATION OF LIQUID SAFETY WALK COMPOUND.Liquid safety walk
compound shall be applied in an area, free of moisture for a period of 24 hours minimum
after application. Do not apply when surface to be coated is below 50 ° F. Apply liquid
safety walk compound as follows:
a. Mix and thin the liquid safety walk compound in accordance with the
manufacturer's instructions on the container.
b. Coat the specified surfaces with a smooth, unbroken film of the liquid safety walk
compound. A nap type roller or a stiff brush is recommended, using fore and aft strokes.
c. Allow the coating to dry for 15 minutes to one hour before recoating or touch-up; if
required after application of the initial coating.
d. After recoating or touch-up, if done, allow the coating to dry for 15 minutes to one
hour before removingmasking.
NOTE
The coated surface shall not be walked on for six hours
minimum after application of final coating.
4-67. SURFACE PREPARATION FOR PRESSURE SENSITIVE SAFETY WALK. The
areas to which the pressure sensitive safety walk is to be installed must be free from all
contaminates and no moisture present. If liquid safety walk is installed the area must be
prepared as follows:
a. Area must be masked off to protect painted surfaces.
b. Apply suitable stripper MEK Federal Spec. TT-M-261, U.S. Rubber No. 3339 to
wingwalk compound. As compound softens remove by using putty knife or other suitable
tool.
c. Area must be clean and dry prior to painting.
d. Prime and paint area.
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NOTE
Newly painted surfaces, shall be allowed to dry for 2.5 hours
minimumprior to the application of the safety walk.
4-68. APPLICATIONOF PRESSURE SENSITIVESAFETY WALK. (Kit 763 848V)
Wipe area with a clean dry cloth to insure that no moisture remains on surface. Do not
apply when surface temperature is below 500 F. Apply pressure sensitive safety walk as
follows:
a. Peel back the full width of the protective liner approximately 2 inches from the
leading edge of the safety walk.
b. Apply the safety walk to the wing area, begin at the leading edge, insure proper
alignment and position from wing lap.
c. Remove the remaining protective liner as the safety walk is being applied from front
to back of wing area.
d. Roll firmly with a long handled cylindrical brush in both lengthwise directions.
Make sure all edges adhere to the wing skin.
e. Install and rivet leadingedge retainer.

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PIPER CHEROKEE SERVICE MANUAL

4-69. CONTROLSURFACEBALANCING.
4-70. CHECKINGCONTROLSURFACEBALANCE. The movable control surfaces have
been statically balanced at the time of installation at the factory and normally should not
require rebalancing. Where possible the control surfaces were set with the balance weight on
the heavy side of the limits, to permit limited repair or paint touch-up without adjusting the
balance weight. It should be noted however, that spare control surfaces are delivered
unpainted and the static balance will not necessarily fall within the limits provided, this is
more pronounced on the stabilators and rudders. The completed control surface, including
paint, should be within the limits givenin Table IV-II. If the surface is not to be painted, the
balance weight will probably require adjustment. All replacement control surfaces, or
surfaces that have been repainted or repaired, should be rebalanced according to the
procedures given in Paragraphs 4-69 thru 4-75. The static balance of the surfaces must be as
specified in Table IV-II.
Before balancing any control surface, it must be complete including tip, trim/servo tabs
and tab actuating arms or push rods with bearingsas applicable,and all optional equipment
which is mounted on or in the control surface when it is flown, including paint, position
lights and wiring, static wicks, scuff boots, etc.
If optional equipment is added or removed after balancing,the control surface must be
rebalanced. During balancing, trim/servo tabs must be maintained in their neutral positions.
The following checks are
4-71 CHECKINGCONTROLSURFACESFREE PLAY.
play" in the stabilator,
"free
of
amount
the
ascertain
to
balancing
recommended before
aileron:
stabilator trim tab and
a. Stabilator: Check the stabilator for any "free play" at its attachment points by
grasping each half near the tip and gently trying to move it up and down, fore and aft, and
in and out. No play is allowed.
b. Stabilator Trim Tab: Set the stabilator trim tab in neutral position. This neutral
position is determined with the airplane properly rigged per instructions givenin Section V
of this Service Manualand the trim indicator at its neutral position. Obtain a straightedge
long enough to extend from the ground up to a few inches above the trim tab trailing edge.
Place the straightedge next to the trim tab inboard (center) trailing edge, secure the
stabilator in neutral and graspingthe tab, gently move it up and down, mark the limit of tab
free play on the straightedge.The overall travel (free play) must not exceed 0.15 of an inch.
The use of a dial indicator and fixed stand is recommended.
c. Aileron: Set the aileron in its neutral position and secure. Obtain a straightedgelong
enough to extend from the ground up to a few inches above the aileron trailing edge. Place
the straightedge next to the aileron trailing edge and gently move the aileron up and down,
mark the limit of travel (free play) on the straightedge.The overall travel (free play) must
not exceed 0.24 of an inch. Should free play exceed the limit stated make necessary repairs
as required to eliminate excessive free play. Grasp the aileron and move it spanwise
(inboard/outboard) to insure maximum end play of .035 of an inch is not exceeded.

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TABLE IV-II. BALANCING SPECIFICATIONS
Maximum Limits - Flight Conditions

STATIC BALANCE LIMITS (INCH-POUNDS)

SURFACE

HEAVYSIDE
TRAILINGEDGE

HEAVY SIDE
LEADING EDGE
0
0
0
0
0

TO
TO
TO
TO
TO

-30
-30

+5
+5
-5

TO
TO
TO

-40
-40
-14

-5
-5

TO
TO

-40
-40

PA-28-235
PA-28-235

THRU 28-7325614
28-7425001 AND UP
ALL
ALL
NON-STRETCHED
STABILATOR
STRETCHED STABILATOR
7305001 TO 7305601
28-7405001 AND UP
TO 7235000
STRETCHED STABILATOR
7235001 TO 7335446
28R-7435001 AND UP
NON-STRETCHED
STABILATOR
7310001 TO 7310176
28-7410001 AND UP

-5
+5
+5

TO
TO
TO

-14
-40
-40

R
U
D
D
E
R
S

PA-28-140
PA-28-140
PA-28-150
PA-28-160
PA-28-180
PA-28-180
PA-28-180
PA-28R-180
PA-28R-200
PA-28R-200
PA-28R-200
PA-28-235
PA-28-235
PA-28-235

UP TO 28-7325614
28-7425001 AND UP
ALL
ALL
THRU 7305000
7305001 TO 7305611
7435001 AND UP
THRU 7235000
THRU 7235000
7235001 TO 7335455
7435001 AND UP
THRU 7310000
731001 TO 7310187
741001 AND UP

0
O
0
0
0
0
0
0
0
0
0
0
0
0

TO
TO
TO
TO
TO
TO
TO
TO
TO
TO
TO
TO
TO
TO

-20.9
-13
-20.9
-20.9
-20.9
-25.0
-13
-15
-15
-14
-13
-15
-14
-14

A
I
L
E
R

PA-28-140
PA-28-150
PA-28-160
PA-28-180
PA-28R-180
PA-28R-200
PA-28-235

ALL
ALL
ALL
ALL
ALL
ALL
ALL

0
0
0
0

S
T
A
B
I
L
A
T
O
R
S

PA-28-140
PA-28-140
PA-28-150
PA-28-160
PA-28-180
PA-28-180
PA-28-180
PA-28R-180/200
PA-28R-200
PA-28R-200
PA-28-235

I

SERIAL NOS.
EFFECTED

MODEL

N

+2
+2
+2

-30
-30
-30

-17
-17
-17
-17
-15
-15
-20

STRUCTURES
Revised: 10/3/83

1117

PIPER CHEROKEE SERVICE MANUAL
4-72 BALANCING EQUIPMENT (Refer to Figure 4-19). The balancing must be done
using a suitable tool capable of measuring unbalance in inch-pounds from the centerline of
the control surface hinge pin. A suggested tool configuration is shown in Figure 4-17. Other
tool configurations may be used, provided accuracy is maintained and recalibration capability
is provided. The tool shown in Figure 4-17 may be calibrated by placing it on the control
surface to be balanced with the balance points over the control surface hinge centerline and
the balance bar parallel to the cord line. Position the trailing edge support to align the tool
with the control surface cord line and secure in this position. Remove the tool without disturbing the trailing edge support and balance the tool by adding weight to the light end as
required. (The movable weight must be at the centerline.) Place the tool on the control surface
perpendicular to the hinge centerline as shown in Figures 4-18 and 4-19. Read the scale when
the bubble level has been centered by adjustment of the movable weight.
4-73. BALANCING AILERONS. (Refer to Figure 4-20.) Position the aileron on the
balancing fixture in a draft free area and in a manner which allows unrestricted movement of
the aileron. Place the tool on the aileron, avoid rivets and keep the beam perpendicular to the
hinge centerline. Calibrate the tool as described in Paragraph 4-72. Read the scale when the
bubble level has been centered by adjustment of the movable weight and determine the static
balance. If the static balance is not within the limits specified in Table IV-II, proceed as
follows:
a. Leading Edge Heavy: This condition is highly improbable; recheck measurements
and calculations.
b. Training Edge Heavy: There are no provisions for adding weight to balance weight to
counteract a trailing edge heavy condition; therefore, it will be necessary to determine the
exact cause of the unbalance. If the aileron is too heavy because of painting over old paint, it
will be necessary to strip all paint from the aileron and repaint. If the aileron is too heavy resulting from repair to the skin or ribs, it will be necessary to replace all damaged parts and
recheck the balance.

Revised: 10/3/83

1118

STRUCTURES

PIPER CHEROKEE SERVICE MANUAL

4-74. BALANCING RUDDER. (Refer to Figure 4-20.)To balance the rudder, the
assembly must be complete including the tip assembly with all attaching screws and the position light wiring. Place the complete assembly horizontally on knife edge supports in a draftfree area in a manner that allows unrestricted movement. Place the tool on the rudder with
the beam perpendicular to the hinge centerline. Calibrate the tool as described in Para-

graph 4-72. Read the scale when the bubble level has been centered by adjustment of the
movable weight and determine the static balance limit. If the static balance is not within the
limits given in Table IV-II, proceed as follows:
a. Nose Heavy: This condition is highly improbable; recheck calculations and
measurements.
b. Nose Light: In this case, the mass balance weight is too light or the rudder is too
heavy because of painting; it will be necessary to strip the paint and repaint. If the rudder is too
heavy as a result of repairs, the repair must be removed and the damaged parts replaced.

Revised: 10 3 83

1I19

STRUCTURES

PIPER CHEROKEE SERVICE MANUAL

C368

3 LB MOVABLE WEIGHT WITH

NUTS AND OR
WASHERS ADDED
AS REQUIRED
TO BALANCE
TOOL ITSELF

SURFACE CHORD LINE

BEAMBALANCING

5 FT. EXTRUDED CHANNEL

BOLT (USED FOR
BALANCING THE
TOOL ITSELF ONCE
THE TRAILING
EDGE SUPPORT
HAS BEEN SET)
HINGE CENTERLINE

MARK GRADUATIONS IN INCHES

PLACED DIRECTLYOVER
HINGE LINE OF CONTROL SURFACE

HORIZONTALLY
ADJUSTABLE FOR
SETTING TOOL TO
WIDTH OF CONTROL
SURFACE

BUBBLE LEVEL

SET SCREW

VERTICALLY AND HORIZONTALLY

ADJUSTABLETRAILING EDGESUPPORT

VERTICALLY
ADJUSTABLE
FOR SETTINGBEAM
PARALLEL
TO CHORD
LINEOF CONTROLSURFACE

Figure 4-19. Control Surface Balance Tool
Reissued: 1/15/81

1I20

STRUCTURES

PIPER CHEROKEE SERVICE MANUAL

A12r

HOLDING
FIXTURE

BALANCING TOOL
(REFERTO FIG. 4-19)

LEVEL SUPPORT

Figure 4-20. Aileron and Rudder Balance Configuration

STRUCTURES

Revised: 10/3/83

1121

PIPER CHEROKEE SERVICE MANUAL

NOTE
The 1974and up models of the PA-28-140and PA-28-180,all
PA-28-235, PA-28R-180 and PA-28R-200 have a nonadjustable mass balance weight molded in the nose of the
rudder tip. All rudders should be maintained within the
static balance weights provided in Table IV-II.
4-75. BALANCING STABILATOR. (Refer to Figure 4-21.) To balance the stabilator, the
assembly must be complete including the trim tab, the tab push rod and end bearing,
stabilator tips and all attaching screws.Beforebalancing,tape the trim tab in neutral position
with a small piece of tape. Place the complete assemblyon the knife edgesupports in a draftfree area in a manner that allows unrestricted movement. Place the tool on the stabilator with
the beam perpendicular to the hingecenterline.Do not place the tool on the trim tab. Calibrate
the tool as describedin Paragraph 4-72 Read the scale whenthe bubble levelhas been centered
by adjustment of the movable weight and determine the static balance limit. If the static
balance is not within the limits given in Table IV-II, proceed as follows:
a. If the stabilator is out of limits on the leading edge heavy side, removebalance plates
from the mass balance weight until the static balance is within limits. Do not attempt to
adjust the stabilator tip balance weight.
b. If the stabilator is out of limits on the trailing edgeheavy side, add balanceplates to
the mass balance weight until the static balanceis within limits.

0

Figure 4-21. Stabilator Balance

Revised: 10/3/83

1122

STRUCTURES

PIPER CHEROKEE SERVICE MANUAL

4-76. AILERON BALANCE WEIGHT MODIFICATION. (PA-28-140, Serial Nos.
28-20002 to 28-25547 incl.; PA-28-150,-160, -180, SerialNos. 28-1 to 28-5339 incl.; PA-28-235,
Serial Nos. 28-10003 to 28-11235 incl.; PA-28R-180, Serial Nos. 28-30005 to 28-31119 incl.)
To facilitate the use of new aileron balance weight assembly (P/N 66766-00) on above stated
airplanes, it will be necessary to modify the balance weight cutout in the wing rib. (Refer to
Figure 4-22.)The hole pattern in the new balance weight bracket is the same as the old bracket
with the exception of two holes. When replacing the old bracket with the new one, it is permissible to use the new bracket as a hole template to drill the two new holes at their proper
location. To install the balance weight assembly, the following procedure may be used:
a. Remove the aileron per Paragraph 4-8.
b. Remove the old balance weight by drilling out the rivets from around the perimeter
of the bracket.
c. Modify the wing end rib, balance arm hole as shown in Figure 4-21.
d. Using the new bracket as a template, drill the two new holes in the rib. (Refer to
Figure 4-22.)
e. Place six cherry lock rivets, CR22494-2, in the holes within the bracket and set the
rivets.
f. Replace the six rivets around the perimeter of the bracket with MS20470AD 3-3,
and set.
g. Prior to installation, paint metal parts where necessary.
h. Install the aileron per Paragraph 4-9.

Reissued: 1/15/81

STRUCTURES

1123

PIPER CHEROKEE SERVICE MANUAL

969

.50R.

Figure 4-22. Wing Rib Modification
885.

RIVETS - MS20470AD3-3

Figure 4-23.

Balance Weight Assembly Installation

Reissued: 1/15/81

STRUCTURES

1124

PIPER CHEROKEE SERVICE MANUAL

888

1.25"

.44"
.88"
.19"

1.75"

Figure 4-24. Fabricated Tool for Baggage Door Lock
4-77. FLAP INSPECTION AND MODIFICATION. (Refer to Figure 4-1.) Inspect
the aft flap attaching point for security. If it is found secure, no modification is
required. If the clevis bolt appears to be working loose from the anchor nut, the
attachment point should be modified in accordancewith the following instructions.
a. Remove the clevis bolt and related parts from the inboard flap hinge attaching point.
b. The skin on the flap must be modified in accordance with Figure 4-1.
c. Remove the existing anchor nuts from the inboard flap hinge.
d. Install a new clevis bolt and related parts and secure with castellated nuts
and cotter pins.
4-78. STABILATOR DRAIN HOLES. In order to prevent the accumulation of
water or ice in the stabilator when the aircraft is parked, it is recommended
that drain holes be added in accordance with Figure 4-25.

STRUCTURES

Reissued: 1/15/81

1J1

PIPER CHEROKEE SERVICE MANUAL

924

1.13

43.20

.191 HOLE
(4 PLACES)

EDGE OF LEADING
EDGE OF SKIN

FWD
FWD.
STABILATOR
(BOTTOM VIEW)

Figure 4-25.

Reissued: 1/15/81

Additional Drain Holes in Stabilator

J2

STRUCTURES

PIPER CHEROKEESERVICEMANUAL
4-79.

BAGGAGE COMPARTMENT INSPECTION HOLE AND COVER PLATE.
(See latest revision of Piper Service Bulletin 977.)

a.

General.
Airplanes manufactured before 1979 may not have had control cable inspection access
holes in the baggage compartment floor. The following is a method of fabricating inspection
access holes in the floor of the baggage compartment, if desired.
b. Baggage Compartment Inspection Holes Fabrication Procedure. (Refer to Figure 4-26.)
While Figure 4-26 shows the hole in the left side of the baggage compartment, a
similar hole is also cut out in the right side baggage compartment floor. Installation will
require two each inspection access covers, Piper P/N 62109-00.
1. Layout cut lines
(a) Gain access to baggage compartment.
(b) Carefully remove:
(1) Right side baggage compartment Royalite plastic close out panel.
(2) Rear close out panel.
(3) Carpeting from baggage compartment floor.
(c) Determine and mark a reference center line running through baggage
compartment. Refer to Figure 4-26 for measurements.
(d) Measure two points 14.99 inches each side of the reference centerline. Joining
these two points will form the centerlines of each inspection hole.
(e) Measure two points on each side of each centerline of both holes at distances of
8.48 inches and 10.98 inches from the aft edge of the baggage compartment
floor.
(f) Connect the two 8.48" points and the two 10.98" points so that the resulting lines
cross the centerline of each hole.
(g) Using the intersection of the lines constructed in step (f) with each hole's centerline as the center, scribe an arc having a radius of 2.00"
(h) Draw a line (four lines total) tangent to each side of the arcs constructed on step (g).
(i) There should now be two ovals, like the one in Figure 4-26, laid out on each side
of the baggage compartment floor.
2.

Cutting the holes.
- CAUTIONBaggage compartment flooring is made of 0.025
inch thick aluminum. Use care when cutting
through flooring so as not to damage cables and
wiring routed below the floor.
(a) Drill a 1/4 inch hole inside of, and adjacent to, one of the scribed lines layed out
for each hole.
(b) Using a 1/8 inch router bit, cut out the two inspection holes by following the lines
layed out on each side of the baggage compartment floor.
(c) Deburr each cut edge using a file or emery wheel.

Interim Revision: February 15, 1995

STRUCTURES

1J3

PIPER CHEROKEE SERVICE MANUAL

3.

Installing covers.
(a) Lay one of the 62109-00 covers over one of the inspection holes. Using the
screw holes in the cover, scribe the position for the screw holes on the baggage
compartment floor.
(b) Drill a 0.120 inch hole in baggage compartment floor at each position layed out
in step (a).
(c) Attach cover to flooring with No.8 X 0.38 corrosion resistant steel sheet metal
screws.
(d) Repeat steps (a) through (c) on remaining hole.

4.
5.

Install baggage compartment rear and side close out panels.
Install baggage compartment floor carpet.

InterimRevision: February15, 1995

STRUCTURES

1J4

PIPER CHEROKEESERVICE MANUAL
21.80"

0

0

14.99"

—

2.28" R

TYP

2.00" R
TYP;M

o

0.120" HOLETHRU
N0.8 X 38 CRESTR USS
RECESSED HEADSHEET
METALSCREWS (16 REQD

0

10.98"
8.48"

AFT

'V
19.11"

Figure 4-26. Baggage Compartment Inspection Holes Cutout Details

STRUCTURES

Interim Revision: February 15, 1995

1J5

PIPER CHEROKEE SERVICE MANUAL

1J6 THRU 1L24
INTENTIONALLY LEFT BLANK

1J6

CHEROKEE

SERVICE
MANUAL
CARD2 OF4
PA-28-140
PA-28-150
PA-28-160
PA-28-180
PA-28-235
PA-28R-180
PA-28R-200

PIPERAIRCRAFT
CORPORATION
(PART
NUMBER
753586)

2A1

TABLE
OFCONTENTS

AIX
IIIX

AEROFICHE
CARD
NO.1
.

INTRODUCTION
......................

.

.

X

...........
.

..........

VII

.. ..............

VIIA.....
VIII . .....

CONTROLS
SURFACE
.
(PA-28R)
SYSTEM
HYDRAULIC
LANDING
GEAR
AND
BRAKE
SYSTEM.

(PA-28)
POWER
PLANT

VIIIA
.............

IIIA

VIIA

2K2

(PA-28)
(POWER
PLANT

IA
A

..
FUELSYSTEM

3D18

X
.

3D18

........
. . .INSTRUMENTS

4A8

NO.4
CARD
AEROFICHE
XI ELETRICAL

XII
XIII

VIIIA

(PA-28R)
SYSTEM
BRAKE
GEAR
AND
. LANDING

VIII .. . . . . . . .

X

1

NO.2
CARD
AEROFICHE

IV ....................
V

IX

SERVICING........
AND
HANDLING
MODIFICATION

II

IV

IIX

1A19

.

ELECTRONICS
........

411

AND
VENTILATING
HEATING

UTILITIES
AND
ACCESSORIES

PIPER CHEROKEE SERVICE MANUAL

LIST OF ILLUSTRATIONS (cont)
Figure

Aerofiche

Grid No.
5-1.
5-2.
5-3.
5-4.
5-5.
5-6.
5-7.
5-8.
5-9.
5-10.
5-11.
5-12.
5-13.
5-14.
5-15.
5-16.
5-17.
5-18.
5-19.
5-20.
5-21.
5-22.
5-23.
5-24.
5-25.
6-1.
6-2.
6-3.
6-4.
6-5.
6-6.
6-7.
6-8.
6-9.
6-10.
6-11.

Control Column Assembly, PA-28-140,-150, -160,
-180 and -235 ............................................
2A15
Control Column Assembly, PA-28R ...................
.........
2A 16
Aileron Controls ..................................
..........
2A20
Bellcrank RiggingTool. PA-28-140,-150, -160, -180, -235..........
2A23
Bellcrank Rigging Tool. PA-28R ...............................
2A23
Aileron RiggingTool ...........................................
2A24
Stabilator RiggingTool .......................................
2B3
Stabilator Controls ...........................................
2B4
Stabilator Trim Control (Overhead Control) .....................
2B8
Methods of Securing Trim Cables ...............................
2B10.
Stabilator Trim Control (Floor Control). ...
.........
........
2B18
Rudder and Steering Pedal Assembly ...........................
2B24
Rudder Controls .............
.....
. .
.. .
. ...
...... . 2C4
Rudder Rigging Tool ............................
........
2C5
Clamping Rudder Pedals ......................................
2C5
Rudder and Stabilator Travel Adjustments ......................
2C6
Rudder Trim Control .........................................
2C8
Flap Controls...........
........
...........
2C10
Flap Step Adjustment ...................
2C12
Flap Rigging Tool ............................................
2C14
Fabricated Aileron Bellcrank Rigging Tool ......................
2C15
Correct Method of Installing Rod End Bearings ..................
2C15
Fabricated Aileron and Flap Rigging Tool .......................
2C16
Fabricated Stabilator Rigging Tool .............................
2C17
Fabricated Rudder Rigging Tool ...............................
2C18
Schematic Diagram of Hydraulic System ........................
2D5
Hydraulic System Installation ..................................
2D6
Hydraulic Pump/Reservoir, Exploded View.....................
2D10
Test and Adjustments of Hydraulic Pump .......................
2D14
Pump Shock Mounts .........................................
2D16
Checking Aligning Brackets of Gear Back-Up Extender
Actuator ...............................................
2D
2D17
17
Gear Back-Up Extender Actuator ..............................
2D21
Nose Gear Actuator Cylinder ..................................
2E2
End Gland Locking Device ....................................
2E4
Main Gear Actuating Cylinder .................................
2E5
Gear Back-Up Extender Actuator Aligning Tool..................
2E20

Revised: 4 23 S42A4

2A4

PIPER CHEROKEE SERVICE MANUAL

LIST OF ILLUSTRATIONS (cont)
Figure
7-1.
7-2.
7-3.
7-4.
7-5.
7-6.
7-7.
7-8.
7-9.
7-10.
7-11.
7-12.
7-13.
7-14.
7-15.
7-16.

7-17.

7-18.
7-19.
7-20.
7-21.
7-22.
7-23.
7-24.
7-25.
7A-1.
7A-2.
7A-3.
7A-4.
7A-5.
7A-6.
7A-7.
7A-8.
7A-9.
7A-10.
7A-11.

Aerofiche
Grid No.
Nose Gear Oleo Strut Assembly ................................
2F2
Nose Gear Installation ...................................
. 2F6
Clamping Rudder Pedals in Neutral Position .....................
2F8
Rudder Pedals at Neutral Angle .................................
2F8
Main Gear Oleo Strut Assembly, PA-28-140, -150, -160 and -180
2F13
Main Gear Oleo Strut Assembly, PA-28-235 ...................
2F15
Main Gear Installation ......................................
2F19
Nose Wheel Assembly...........................................
2F21
Main Wheel Assembly ........................................
2F23
Wheel Brake Assembly........................................
2GI
Removal of Anchor Bolt .....................................
2G2
Installation of Anchor Bolt ....................................
2G3
Brake Disc Minimum Thickness ..........................
. 2G5
Brake System Installation .....................................
2G5
Brake Master Cylinder (Hand.Brake), PA-28-150,-160,
Serial Nos. 28-1 to 28-250 incl ...............................
2G8
Brake Master Cylinder (Hand/Parking Brake), PA-28-140.
Serial Nos. 28-20002to 28-21036incl.; PA-28-150,
-160, -180, Serial Nos. 28-251to 28-2700incl.;
PA-28-235,Serial Nos. 28-10003to 28-10697 incl .. ..........
2G8
Brake Master Cylinder (Hand/Parking Brake), PA-28-140,
Serial Nos. 28-21037and up; PA-28-150,-160, -180,
Serial Nos. 28-2701 and up; PA-28-235,Serial Nos.
28-10698and up.........................................
2G9
Parking Valve, PA-28-150,-160, Serial Nos. 28-1 to 28-250incl ....
2G11
Toe Brake Installation ........................................
2G12
Brake Cylinder 10-20, 10-27, 17000(Toe Brake) ................
2G14
Brake Cylinder 10-30(Toe Brake) ..............................
2G23
Bleeding Brake (Gravity) ......................................
2G17
Bleeding Brake (Pressure) .....................................
2G17
Orifice Replacement Tool .....................................
2G22
Retainer Ring Tool ...........................................
2G15
Nose Gear Oleo Strut Assembly ................................
2G18
Nose Gear Installation ........................................
2G18
Nose Gear Adjustment (Without Gear Up Stop) .................
223
Nose Gear Adjustment (With Gear Up Stop)....................
2G24
Clamping Rudder Pedals in Neutral Position .....................
2H19
Rudder Pedals at Neutral Angle................................
2H19
Nose Gear Door Retraction Mechanism .........................
2H20
Main Gear Oleo Strut Assembly..............................
211
Main Gear Installation ...........
........................
214
Aligning Main Gear ..........................................
2110
Adjustment of Nose Gear Down Limit Switch ....................
2115

Revised: 8/3/81

2A5

PIPER CHEROKEE SERVICE MANUAL

LIST OF ILLUSTRATIONS (cont)
Aerofiche
Grid No.

Figure
7A-12.
7A-13.
7A-14.
7A-15.
7A-16.
7A-17.
7A-18.
7A-19.
7A-20.
7A-21.
7A-22.
7A-23.
'7A-24.
7A-25.
7A-26.
8-1.
8-2.
8-3.
8-4.
8-5.

8-6.
8-7.

Adjustment of Main Gear Down Limit Switch ...................
Wiring Diagram of Landing Gear Electrical Circuit ................
Throttle Warning Switches ....................................
Nose Wheel Assembly................
... ..............
Main Wheel Assembly ........................................
Wheel Brake Assembly................. .......................
Brake Disc Minimum Thickness ................................
Brake System Installation .....................................
Brake Master Cylinder (Hand/ Parking Brake) ...................
Toe Brake Installation .........................................
Brake Cylinder (Toe Brake) (10-20, 10-27. 17000).................
Brake Cylinder (Toe Brake) (10-30) .............................
Bearing Installation ...................
..... .................
Nose Gear Service Tolerances, PA-28R ..........................
Main Gear Service Tolerances. PA-28R .........................
Typical Nicks and Removal Method ...........................
Propeller Installation (Constant Speed) PA-28-235 .........
Propeller Installation ..........................
Adjustment of Propeller Control (PA-28-235) . . . ........

2K 13

Propeller Governor (PA-28-235) .....................

Engine Installation (PA-28-140,-150.-160.-180:
Serial Nos. 28-1 to 28-1760) .
. . ..............
Engine Installation (PA-28-140. -150, -160. -180
Serial Nos. 28-1761 and up)

Engine Shock Mount Installation (PA-28-140.
Serial Nos. 28-25000 and up) ...................

8-9.
8-10.

Engine Installation(PA-28-235) ..................
Adjustment of Engine Controls ..........

8-11.

Carburetor (PA-28-140, -150. -160) ...................

8-12.

Carburetor (PA-28-180. -181.-235)

2K17

2K18

2A6

2K22
2K24

..........

2L3
2L3

...................

............
Magneto Inspection ...............
...............
Contact Spring Inspection .........
..................
Impulse Coupling .........
........
. ......
......
MagnetoTiming Marks .
Timing Pointer ................................
Timing Kit Installed . ...........................
..........
Breaker Compartment with Cast Timing Marks .
RemovingSpark Plug Frozen to Bushing .................

Revised: 8/3/81

2K16

....................

8-8.

8-13.
8-14.
8-15.
8-16.
8-17.
8-18.
8-19.
8-20.

.

2115
2117
2119
2122
2123
2J I
2J3
2J3
2J5
2J6
2J8
2J 10
2J11
2J20
2J23
2K8
2K8
2K9
2K13

.

2L5
2L6
2L6
2L7
2L7
2L8
2L8
2L13

PIPER CHEROKEE SERVICE MANUAL

LISTOFTABLES
Aerofiche
Grid No.

Table
V-l.
V-II.
V-Ill.
VI-I
VI-II.
VI-III.
VII-.
VII-II.
VIIA-I.
VIIA-II.
VIIA-III.
VIII-I.
VIII-II.

Revised: 8/3/81

Control Surface Travel and Cable Tension ..........
....
Cable Tension vs. Ambient Temperature ...................
Troubleshooting Chart (Surface Controls) ..............
Leading Particulars. Hydraulic System .................
Characteristics. Hydraulic Pump Motor ....................
Hydraulic System Troubleshooting ...................
Nose Gear Alignment Tolerances ....................
Landing Gear Troubleshooting ...................
...
Landing Gear Troubleshooting .....................
PA-28R Nose Gear ServiceTolerances ................
PA-28R Main Gear ServiceTolerances ................
Propeller Torque Limits .............
..........
Engine Troubleshooting Chart .....................

2A7

2A11
. 2A13
2C19
2D8
. 2D13
2E9
2F9
2G20
2J 12
2J21
2J24
2K 10
2L17

SECTION V
SURFACE CONTROLS
Paragraph
5-1.
5-2.
5-3.
5-4.
5-7.

5-14.

5-18.

5-24.

Aerofiche
Grid No.

Introduction .....................
...........................
Description .....................
..........................
Standard Procedures ..........................................
Control Column Assembly..................................
5-5.
Removal of Control Column Assembly .................
5-6.
Installation of Control Column Assembly ...............
Aileron Controls .............................................
5-8.
Removal of Aileron Control Cables ...................
5-9.
Installation of Aileron Control Cables ..................
5-10.
Removal of Aileron Bellcrank Assembly ................
5-11.
Installation of Aileron Bellcrank Assembly..............
5-12.
Rigging and Adjustment of Aileron Controls ............
5-13.
Adjustment of Aileron Trim.. .......................
Stabilator Controls ...........................................
5-15.
Removal of Stabilator Control Cables ..................
5-16.
Installation of Stabilator Control Cables................
5-17.
Rigging and Adjustment of Stabilator Controls..........
Stabilator Trim Controls (Overhead Trim)
.
......................
5-19.
Removal of Stabilator Trim Assembly (Forward) ........
5-20.
Installation of Stabilator Trim Assembly (Forward) ......
5-21.
Removal of Stabilator Trim Controls (Aft) .............
5-22.
Installation of Stabilator Trim Controls (Aft) ...........
5-23.
Rigging and Adjustment of Stabilator Trim
(Overhead Control) ............
...............
Stabilator Trim Controls (Floor Trim) .........
.
.......
5-25.
Removal of Stabilator Trim Assembly (Forward) ........
5-26.
Installation of Stabilator Trim Assembly (Forward) ......

Reissued: 1/15/81
2A8

2A10
2A10
2A 14
2A17
2A 17
2A 18
2A19
2A19
2A21
2A22
2A22
2A23
2B2
2B2
2B2
2B3
2B5
2B7
2B7
2B9
2B9
2B 12
2B15
2B17
2B17
2B 19

Aerofiche
Grid No.
5-27.
5-28.

5-30.

5-33.

5-37.

5-41.

Reissued: 1/15/81

Removal of Stabilator Trim Assembly (Aft)
Installation of Stabilator Trim Assembly
(Aft) . . . . . . . . . . .
.
5-29.
Rigging and Adjustment of Stabilator Trim
(Floor Control) .
....
Rudder and Steering Pedal Assembly ..
.....
5-31.
Removal of Rudder and Steering Pedal
Assembly ..
........
5-32.
Installation of Rudder and Steering Pedal
Assembly ...........
Rudder Controls .
...............
5-34.
Removal of Rudder Control Cables
5-35.
Installation of Rudder Control Cables
5-36.
Rigging and Adjustment of Rudder Controls
Rudder Trim Controls ......
.
.
. . .
5-38.
Removal of Rudder Trim Controls . .
5-39.
Installation of Rudder Trim Controls .
5-40.
Rigging and Adjustment of Rudder Trim
Controls ............
Wing Flap Controls .
. . ...........
5-42.
Removal of Wing Flap Controls .
..
5-43.
Installation of Wing Flap Controls .
.
5-44.
Rigging and Adjustment of Wing Flaps .

2A9

2B20
2B21
2B22
2B23
2B23
2C1
2C2
2C2
2C3
2C5
2C7
2C7
2C7
2C8
2C8
2C8
2Cll
2C12

PIPER CHEROKEE SERVICE MANUAL

SECTION V
SURFACE CONTROLS

5-1. INTRODUCTION. This section contains removal, installation, rigging, adjustment
and trim procedures for ailerons, flaps (lesstrim), stabilator and rudder flight control surfaces.
Also included are similar procedures for the control column and rudder and steering pedal
assembly. For removal, installation, and repair of structural surfaces of the airplane, refer to
Section IV.

5-2. DESCRIPTION. The PA-28 is controlled in flight by the use of three standard primary control surfaces, consisting of the ailerons, stabilator and rudder.
Operation of these controls is through the movement of the dual control columns
and dual rudder pedals. The individual surfaces are connected to their control
components through the use of cables and push-pull tubes. Provision for directional and longitudinal trim control is provided by an adjustable trim mechanism
for the rudder and stabilator. The flaps on the PA-28 are mechanically operated
and can be positioned in four locations of 0, 10, 25 and 40 degrees.
The aileron controls consist of two-control wheels connected by torque
tubes to sprockets on each end of the horizontal control column. A chain is wrapped around the sprockets and around a double sprocket on the vertical post of the
control column. The chain is connected to the primary aileron control cable
which is routed through the center of the fuselage to the main spar and out through
the wings to a bellcrank in each wing. A balance cable is also connected to the
bellcrank.
As the control wheels are moved, the control cables move the bellcranks and actuate push-pull rods to move the ailerons.
The stabilator controls are also connected to the control column. From
the connecting point, cables are routed around a series of pulleys down under the
floor and aft to the tail section of the airplane. The aft end of the cables connect
to the stabilator balance arm which in turn is connected to the stabilator.
When
the control wheels are moved forward or aft, the cables move the balance arm
up and down rotating the stabilator on its hinge points.
The rudder is controlled by the pilot's and co-pilot's rudder pedals. Cables
are connected to both sides of the rudder pedal assembly and are routed aft
through the bottom of the fuselage to the rudder horn. When one rudder pedal is
pushed, the cables move in opposite directions turning the rudder horn and rudder. The wing flap system is operated by a lever located between the front seats.

Reissued: 1/15/81

2A10

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PIPER CHEROKEE SERVICE MANUAL
TABLE V-l CONTROLSURFACETRAVEL AND CABLETENSION
C3

40

Aileron

A 30°

+ 2UP

ALLMODELS
AILERON CHORDLINE

°

B 15
C

+ 2ODN ALL MODELS

0°

53'

0°

+ 2UP

UP ALL MODELS
PREVIOUSTO 1973
1973 MODELS
AND UP
Maximum free play for aileron is 0.24 of an inch.
measured at trailing edge(up/down movement).
Maximum free play spanwise is .035 (inboard/
outboard movement).
4-70.
Referto SectionIV,Paragraph
C340

Rudder
L

ALL MODELS

+ 2° R

ALL MODELS

A 27 ± 2
B 27

1681

C340

Flap
C340
A 25

+ 2

ALL MODELS

B 100 ± 2 °
C

ALL MODELS

FLAP CHORD LINE
A

ALL MODELS
PREVIOUSTO 1973
UP 1973 MODELS
AND UP

0 53'UP
O° + 1

D 40 + 2

ALL MODELS
WING CHORD LINE

Revised: 10/3/83

2All

SURFACE CONTROLS

PIPER CHEROKEE SERVICE MANUAL
TABLE V-I CONTROL SURFACE TRAVEL AND CABLETENSION (cont.)
Stabilator
Stabilator Trim Tab
A 18'
11 UP 1974PA-28-140MODELS
All PA-28-140Models.All modelsprevious
to 1973 exceptthe PA-28R-200which includes
modelspreviousto 1972.

STABILATORCHORD LINE
(NEUTRAL POSITION)
(SEE NOTE 3)

16 ± 1 UP ALL PA-28R-200MODELS
PA-28R-200ModelsSerialNos. 28-7235001
and up endPA-28-235ModelsSerialNos.
28-7310001andup.
14 ± 1 UF 1973PA-28-180SERIAL
PA-28-180 ModelsSerial Nos. 28-73050'1
and up.
B 3° ± 1* UP
C 2* + 1° DN
D 12° 1* DN

ALL MODELS
ALL MODELS
ALL MODELS

Rudder Pedal Neutral Angle
AFTOF VERTICAL

1. Maximum free play for control surface tab is
0.15 of an inch measuredit tabtrailing edge.
2. Referto SectionIV,Paragraph4-70.
3. Neutral position of stabilator is with the
stabilator chord line parallel with the top of
the front seat tracks.
8 degrees, 15 minutes PA-28-140,Serial Nos. 28-20002 to 28-20520 incl.
PA-28-150,-160.-180. Serial Nos. 28-1 to 28-1760 incl.
PA-28-235.Seriel Nos. 28-10000 to 28-10486 incl.
11degrees

PA-28-140,Serial Nos. 28-20521 to 28-7325684
PA-28-150, -160.-180. Serial Nos. 28-1761 to 28-730561
PA-28-235,Serial Nos. 28-10487 to 28-7310187
PA-28R-200Models Previousto 1974

14 +3 .-1

All 1974Modelsandup

Cable Tensions

I

AILERON
FLAP
STABILATOR
STABILATORTRIM TAB
RUDDER

40 lbs ±

5 lbs
1 lb
40 lbs
5 1bs
14 lbs ± 1 lbs
40 lbs ± 5 lbs
10

35 bs ± 5 lbs

ALL MODELS
ALL MODELS
ALL MODELS
ALL MODELS
1973 MODELS
AND ALL MODELS
PREVIOUSTO 1973
ALL 1974 MODELSAND UP

NOTE
CABLE TENSIONS GIVEN APPLY ONLY TO AIRPLANES WITHOUT
AUTOPILOT BRIDLE CABLES ATTACHED. REFER TO APPROPRIATE
AUTOPILOT SERVICE MANUAL FOR PROPER CABLE TENSIONS WHEN
ATTACHING BRIDLE CABLES.
CABLE RIGGING TENSIONS SPECIFIED MUST BE CORRECTED TO
AMBIENTTEMPERATURE IN THE AREA WHERE THE TENSION IS BEING
CHECKEDUSING TABLE V-II.

Revised: 10.3.83

2A12

SURFACE CONTROLS

PIPER CHEROKEE SERVICE MANUAL

TABLE V-II. CABLETENSIONVS. AMBIENTTEMPERATURE
A99

120

110

100

z

90

LL

80

70

60

50

UJ
40

30

20

-10
I

-8

-6

-4

SUBTRACT

-2

0
I

2

4

6

10

ADD

RIGGING LOAD CORRECTION,POUNDS

Revised: 10 3 83

2A13

SURFACECONTROLS

PIPER CHEROKEE SERVICE MANUAL
For a visual description of the various control systems, refer to the illustrated figures.
throughout this section.
5-3. STANDARD PROCEDURES. The following tips may be helpful in the removal,
installation and riggingof the various assemblies:
a. It is recommended, though not always necessary to level and place the airplane on
jacks during rigging and adjustment.
b. Remove turnbuckle barrels from cable ends before withdrawing the cables through
the structures.
c. Tie a cord to the cable end before withdrawing the cable through the structures to
facilitate reinstallation of cable.
d. Turnbuckle stations are givenat their neutral positions.
e. When referring to marking cable end, etc., before disconnectinga felt marking.pen
may be used.
f. Assemble and adjust the turnbuckles so that each terminal is screwed an
approximately equal distance into the barrel. Do not turn the terminals in such a manner
that will put a permanent "twist" into the cables.
g. Cable tensions should be taken with the appropriate control surface in its neutral
position.
h. After completion of each adjustment, check the turnbuckles to be sure not more
than three terminal threads are visibleoutside the barrel. Install the locking clips, and check
for proper installation by trying to remove the clips using fingers only. Both locking clips
may be installed in opposite holes. Locking clips which have been installed and removed
must be scrapped and not reused. Turnbuckles may be safetied in accordance with Advisory
Circular 43.13-1A Chapter 4, Section 2.
i. When push rods or rod ends are provided with an inspection hole, the screw must be
screwed in far enough to pass the inspection hole. This can be determined visually or by
feel, inserting a piece of wire into the inspection hole. If no hole is provided, there must be a
minimum of .375 of an inch thread engagement.
j. After completion of adjustments, each jam nut must be tightened securely (Refer to
Figure 5-22 for proper installation method).
NOTE
Cable rigging tensions specified must be corrected to ambient
temperature in the area where the tension is being checked,
using Table V-II.
k. When normal operation requires movement between any of the components being
clamped together, the bolt (screw)-nut shall be tightenedas required to insure intended normal
operation of the assembly, without reference to Table II-II.
1. Unless otherwisespecified, whencastellatednuts are usedwith a cotter pin on moving
joints, the nut shall not be torqued to the Table II-II values. Nuts shall be tightened to remove
looseness in the joint and then the cotter pin installed.

Reissued: 1/15 / 81

2A14

SURFACE CONTROLS

0

PIPER CHEROKEE SERVICE MANUAL

54. CONTROL COLUMNASSEMBLY.
5-5. REMOVALOF CONTROLCOLUMNASSEMBLY. (Refer to Figure 5-1 or 5-2.)
a. To remove either control wheel (1) with tube (2), the followingprocedure may be
used:
1. Separate the control wheel tube (2) from the flexiblejoint (4) that is located on
either side of the tee bar assembly (5) by removing the nut, washer and bolt (3). Pull the
tube from the flexiblejoint.
2. If removing the left control tube, slide the stop (6) from the tube.
3. Should wires for the various Autopilot systems be installed in the control tube,
disconnect them at the quick disconnect terminals behind the instrument panel. Draw the
wires back into the tube and out through the forward end of the tube.
4. Remove the control wheel assembly from the instrument panel.
b. The tee bar (5) with assembled parts may be removed from the airplane by the
following procedure:
1. Remove the accesspanel or door to the aft section of the fuselage.
2. Relieve cable tension from the stabilator control cables (11) at one of the
stabilator cable turnbuckles in the aft section of the fuselage.
3. Relieve tension from the aileron control cables (12) and chains (7 and 8)
and at the turnbuckle (9) that connects the chains at the top of the tee bar (5).
4. Disconnect the control chains from the control cables where the chains
and cables join by removing the cotter pins, nuts, bolts and bushings (10).
5. Remove the tunnel cover by the following procedure:
(a) PA-28-140; PA-28-1-50,-160, -180; and PA-28R:
Remove the rudder trim control knob and trim cover attaching screws. Roll back
the carpet from the tunnel and remove the tunnel plate that is located just aft of
the tee bar assembly, by removing the plate attaching screws.
(b) PA-28-235:
Remove the fuel selector and rudder trim covers by removing the knobs and the
attaching screws. Disconnect the fuel indicator control lever from the fuel selector torque tube by removing the attaching pin located at the bottom of the lever.
Remove the tunnel plate, located just aft of the tee bar, by laying back enough
tunnel carpet to remove the plate attaching screws..
6. Remove the two aileron control cable pulleys (13)attached to the lower
section of the tee bar by removing the pulley attaching bolt (14).
7. Disconnect the stabilator controls (11) from the lower end of the tee bar
assembly.
8. Disconnect the necessary controls, such as the mixture control, throttle
control, etc., that will allow the tee bar assembly to be removed.
9. Remove the tee bar assembly by removing the attaching bolts (15) with
washers and nuts, which are through each side of the floor tunnel, and lifting it
up and out through the right side of the cabin.

Reissued: 1/15/81

2A17

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PIPER CHEROKEE SERVICE MANUAL
5-6. INSTALLATION OF CONTROL COLUMN ASSEMBLY.
(Refer to Figure 5-1 or 5-2.)
a. The tee bar assembly may be installed in the airplane by the following procedure:
1. Swing the tee bar assembly into place from the right side of the cabin
and secure with attaching bolts (15), washers and nuts inserted in through each
side of the floor tunnel.
2. Connect the stabilator controls (11) to the lower end of the tee bar with
bolt, washer, nut and cotter pin (16). Allow the cable ends free to rotate.
3. Place the aileron control cables (12) around the pulleys (13) that attach to the
lower section of the tee bar (5), position pulleys and secure with bolt, washersand nut (14).
4. Install the control wheel per step b.
5. Place the control wheels in neutral (centered) position and install the aileron
control chains (7 and 8) on the control wheel sprockets (17 and 18) and idler crossover
sprockets (19 and 21). This turnbuckle (9) must be centered between the two control wheel
sprockets.

6. Loosen the connecting bolts (22) of the idler sprockets (i9 nd 21) to allow the
chain to fit snug around the control wheel sprockets and over the idler sprockets.
7. Connect the aileron control cables (12) to the ends of the chains(7 and 8) with
bolts, bushings,nuts and cotter pins (10).
8. Adjust the chain turnbuckle (9) between the two control wheel sprockets to
allow the control wheels to be neutral and obtain proper cable tension as givenin Table V-I.
It may be necessary, in order to have both control wheels neutral, to set the chain
turnbuckle to neutralize the wheels and then set cable tension with the turnbuckleslocated
under the floor panel aft of the main spar as instructed in paragraph 5-12. Beforesafetying
the tumbuckle, check that when the ailerons are neutral, the control wheels willbe neutral
and the chain turnbuckle centered. Also, the aileron bellcranks should contact their stops
before the control wheel hits its stop. Maintain .030 to .040 clearancebetween sprocket pin
and adjustable stop bolts on models having adjustable aileron tee bar stops.
9. Set stabilator cable tension with the turnbuckle in the aft section of the fuselage
and instructions given in paragraph 5-17. Check safety of all turnbuckles upon completion
of adjustments.
10. Tighten the connecting bolts (22) of the idler sprockets (19 and 21).
1 1. Install the floor tunnel plate trim covers by the followingprocedure:
(a) PA-28-140;PA-28-150, -160, -180; and PA-28R: Place the tunnel plate into
position for installation and secure with the appropriate screws. Roll the
carpet into place and install the rudder trim cover and knob.
(b) PA-28-235: Install the floor tunnel plate and secure with the appropriate
screws. Fasten the tunnel carpet into place and install the fuel selector lever
on the selector torque tube and secure with a clevis pin and cotter pin.
Replace the fuel selector and rudder trim knob.
b. Either control wheel assemblymay be installed by the followingprocedure:
1. Insert the control wheel tube through the instrument panel.
2. Should wires for the various Autopilot systems need to be installed in the
control tube, route them through the hole in the forward side of the tube and out of the
small hole in the forward side. Position the rudder grommet in the hole in the side of the
tube.
3. On the left control tube install the stop (6).
SURFACE CONTROLS

Reissued:1/15/81

2A18

PIPER CHEROKEE SERVICE MANUAL

4. Connect the control wheel tube (2) to the flexible joint (4) of the tee bar
assembly. If the control cables and/or chains have not been removed or loosened, place the
ailerons in neutral and install the control tube on the flexible joint to allow the control
wheel to be neutral. Install bolt, washerand nut (3) and tighten.
5-7. AILERON CONTROLS.
5-8. REMOVALOF AILERONCONTROLCABLES. (Refer to Figure 5-3.)
a. For the removal of either the control cables in the fuselage or thewings, first remove
the baggage area floor panel of the PA-28-140 airplane, or the rear seat bottom on the
PA-28-150, -160, -180; PA-28-235and PA-28R airplanes.
b. To remove either the right or left primary control cables (14 or 15) that are located
in the fuselage,the followingprocedure may be used:
1. Remove the two front seats from the airplane.
2. Remove the tunnel cover located aft of the tee bar assembly by the following
procedure:
(a) PA-28-140; PA-28-150,-160, -180; and PA-28R: Remove the rudder trim
control knob and trim coverattaching screws.Roll back the carpet from the
tunnel and remove the tunnel plate that is located just aft of the tee bar
assembly by removingthe plate attaching screws.
(b) PA-28-235: Remove the fuel selector and rudder trim covers by removing
the knobs and the attaching screws. Disconnect the fuel indicator control
lever from the fuel selector control lever from the fuel selector torque tube
by removing the attaching pin located at the bottom of the lever. Remove
the tunnel plate locatedjust aft of the tee bar by laying back enough tunnel
carpet to removethe plate attaching screws.
NOTE
To help facilitate reinstallation of control cables, mark the
cable ends and attach a line where applicable before drawing
them through the fuselageor wing.
3. Separate the primary control cable (14 or 15) at the turnbuckle (12 or 16)
located under the rear seat or floor panel aft of the main spar.
4. Remove the cable pulleys (8) attached to the lower section of the control
column tee bar assembly by removingthe pulley attaching bolt (21).
5. Move the cable guard (20) under the pulley cluster (9) located just aft of the
lower portion of the tee bar by removingthe cotter pin from the exposed end of the guard
and sliding it to the left or right as required.
6. Remove the cotter pins used as cable guards at the pulley (10) in the forward
area of the floor opening aft of the main spar.
7. Disconnect the cable (14 or 15) from the control chain (4) at the control
column tee bar assembly by removing the cotter pin, nut, bolt and bushing (23) that
connect the two together. Secure the chains in some manner to prevent them from
unwrapping from around the sprockets.
8. Draw the cable back through the floor tunnel.

Reissued: 1/15/81

2A19

SURFACE CONTROLS

PIPER CHEROKEE SERVICE MANUAL

c. The primary control cable (13 or 17) in either wing may be removed by the
followingprocedure:
1. Remove the access plate to the aileron bellcrank (6) located on the underside of
the wing forward of the inboard end of the aileron.
2. If not previously disconnected, separate the cable at the turnbuckle (12 or 16)
located in the area aft of the main spar.
3. Disconnect the cable from the forward end of the aileron bellcrank by removing
the cotter pin, nut, washer and bolt.
4. Drawthe cable from the wing
c. Either balance cable (18 or 19) may be removed by the following procedure:
1. Separate the balance cable at the turnbuckle (24) in the right side of the opening
aft of the main spar.
2. If the left balance cable is to be removed, remove the cotter pin used as a cable
guard at the pulley (11) in the center of the opening.
3. Remove the accessplate to the aileron bellcrank (6) located on the underside of
the wing forward of the inboard end of the aileron.
4. Disconnect the cable from the aft end of the aileron bellcrank by removing the
cotter pin, nut, washer and bolt.
5. Drawthe cable from the wing.
5-9. INSTALLATIONOF AILERONCONTROLCABLES. (Refer to Figure 5-3.)
a. The installation of either the right or left primary control cable (14 or 15) that is
located in the fuselagemay be accomplishedas follows:
1. Draw the cable through the fuselagefloor funnel.
2. Connect the cable to the end of the control chain (4) and secure using bushing,
bolt, nut and cotter pin (23).
3. Place the cable around the pulley (9) that is located in the tunnel aft of the tee
bar. Install the cable guard (20) and secure with a cotter pin.
4. Position cables and install the cable pulleys (8) that attach to the lower section
of the tee bar assembly.Secure with bolt, washer and nut (21).
5. Place the cable around the pulley (10) that is located within accessopeningjust
aft of the main spar and install cotter pin cable guards.
6. If the primary control cable in the wing is installed, connect the control cable
ends at the tumbuckle (12 or 16) located within accessopening just aft of the main spar.
7. Checkriggingand adjustment per pargraph 5-12.
8. Install the floor tunnel plate trim cowersby the following procedure:
(a) PA-28-140;PA-28-150,-160, -180; and PA-28R: Place the tunnel plate into
position for installation and secure with the attachment screws. Roll the
carpet into place and install the rudder trim cover and knob.
(b) PA-28-235: Install the floor tunnel plate and secure with the attachment
..screws. Fasten the tunnel carpet into place and install the fuel selector lever
on the selector torque tube and secure with a clevis pin and cotter pin.
Replace the fuel selector and rudder trim covers and the rudder trim knob.
b. The primary control cable (13 or 17) in either wing may be installed by the
followingprocedure:
1. Drawthe control cable into the wing.
2. Connect the cable to the forward end of the aileron bellcrank (6) using a bolt,
washer, nut and cotter pin. Allow the cable end to rotate freely on the bellcrank.

Reissued: 1/15/81

2A21

SURFACE CONTROLS

PIPER CHEROKEE SERVICE MANUAL

3. If the primary control cable in the fuselage is installed, connect the ends at the
turnbuckle (12 or 16) located under the rear seat aft of the main spar.
4. Check riggingand adjustment per paragraph 5-12.
5. Install the access plate on the underside of the wing.
c. Either balance cable (18 or 19) may be installed by the followingprocedure:
1. Draw the cable into the wing.
2. Connect the cable to the aft end of the aileron bellcrank (6) using a bolt, washer,
nut and cotter pin. Allow the cable end to rotate freely on the bellcrank.
3. Connect the balance cable ends at the turnbuckle (24) that is located under the
rear seat aft of the main spar.
4. If the left cable was removed, install the cotter pin cable guard at the pulley (10)
located within the fuselage, aft of the main spar.
5. Check riggingand adjustment per paragraph 5-12.
6. Install the access plate on the underside of the wing.
d. Replace the rear seat bottom or floor panel and the two front seats.
5-10: REMOVAL OF AILERON BELLCRANK ASSEMBLY (Refer to Figure 5-3.)
a. Remove the baggage area floor panel of PA-28-140 airplanes or the bottom half of
the rear seat of the PA-28-150, -160, -180; PA-28-235 and PA-28R airplanes.
b. Remove the access plate to the aileron bellcrank (6) located on the underside of the
wing, forward of the inboard end of the aileron.
c. Relieve tension from the aileron control cables by loosening the balance cable
turnbuckle (24) located in the opening aft of the main spar.
d. Disconnect the primary (13 or 17) and balance (18 or 19) control cables from the
bellcrankassembly by removingcotter pins, nuts, washers and bolts.
e. Disconnect the aileron control rod (7) at the aft or forward end, as desired, by
removingthe cotter pin, nut, washer and bolt.
f. Remove the nut, pivot bolt (25) and washers that secure the bellcrank. The nut is
visiblefrom the underside of the wing.
g. Remove the bellcrank from within the wing.
5-11. INSTALLATIONOF AILERONBELLCRANK ASSEMBLY. (Refer to Figure 5-3.)
a. Ascertain that the bellcrankpivot bushing (26) is lubricated and install in the torque
tube portion of the bellcrank (6).
b. Place the bellcrank in position in the wing with a washer located between each end
of the torque tube and the mounting brackets.
c. Install the bellcrank pivot bolt (25) with the head up. Install a washer and nut on
the bolt, and torque nut within 20 to 25 inch-pounds. Check that the bellcrank rotates
freely with little up-down play.
d. Install and adjust control rod (7) and check aileron travel per paragraph 5-12.
e. Connect the ends of the primary (13 or 17) and balance (18 or 19) control cables to
the bellcrank usingbolts, washers,nuts and cotter pins. Allow the cable ends to rotate freely
on the bellcrank.
f. Tighten the control cables at the balance cable turnbuckle (24) in the floor opening
aft of the main spar. Check cable tension per paragraph 5-12.
g. Install the access plate on the underside of the wing and replace the floor panel or
rear seat bottom.

Reissued: 1/15/ 81

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1652

I

2054

Refer to Figure 5-21 for tool fabrication

Refer to Figure 5-21 for tool fabrication

Figure 5-4. BellcrankRiggingTool
PA-28-140,-150, -160, -180, -235

Figure 5-5. Bellcrank RiggingTool
PA-28R

5-12. RIGGING AND ADJUSTMENTOF AILERON CONTROLS. (Refer to Figures 5-4
thru 5-6.)
NOTE
Flap adjustment must be complete before starting aileron
adjustment.
a. To check and adjust the riggingof the aileron controls, first set the right and left
aileron bellcranks at neutral position.(Ascertainthat the control chains have been rigged per
paragraph 5-6.) This may be accomplishedby the following procedure:
1. Place tee bar in full forward position. Maintain in this position by use of a
suitable tool or by placing weights on aft side of stabilator if stabilator cables have been
previouslytensioned.
2. Remove the accessplate to each aileron bellcrank located on the underside of the
wing. forward of the inboard end of the aileron by removing the plate attaching screws.
3. Affix a bellcrank rigging tool, as shown in Figures 5-4 or 5-5. between the
forward arm of each bellcrankand the adjacent rib. (This tool may be fabricated to dimensions
given in Figure 5-21.)The slotted end of the tool fits on the arm forward of. and adjacent to, the
primary control cable end. The other end of the tool is positioned so that the side of the tool
contacts the aft side of the bellcrankstop. The bellcrank must be moved to allow a snug fit of
the tool betweenthe bellcrankarm and rib. To do so. it may be necessaryto loosen a primary
control cable or the balance cable. Neutral position of the bellcranks may also be found by
locating the centers of the forward and aft cable connection holes an equal distance from the
adjacent inboard wing rib.

Revised: 10 3 83

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b. With each bellcrank set at neutral, the ailerons on the PA-28-140, -150, -160, -180,
-235 and 28R may be checked and adjusted for neutral as follows:
1. Ascertain that the bellcrank rigging tool fits snug between the bellcrank and the
rib.
2. Place an aileron rigging tool as shown in Figure 5-6 against the underside of the
wing and aileron as close as possible to the inboard end of the aileron without contacting
any rivets. The tool must be positioned paralleled with the wing ribs, with the aft end of the
tool, even with the trailing edge of the aileron. (This tool may be fabricated to dimensions
given in Figure 5-23.)
3. With the aileron control rod connected between the bellcrank and aileron, check
that the surface of the wing contacts the tool at its forward surface and at the spacer, and
the trailing edge of the flap contacts the aft end of the tool. The aileron is neutral at this
position.
4. Should the three points not contact, loosen the jam nut at the aft end of the
control rod and rotate the rod until the three points contact. Apply a slight up pressure
against the trailing edge of the aileron while making this adjustment. After adjustment,
retighten the jam nut.

.375 HEIGHTSPACER IS TO BE IN LINEWITH AFTSPAR
RIVET LINE.BUT SHOULD NOT MAKE CONTACTWITH
ANYRIVETS.
NEUTRALPOSITION OF AILERONWILL OCCUR WHEN
THESETHREEPOINTS MAKECONTACTWITH
WING AND
AILERONSKIN.

I
REFER
TO FIGURE5-23 FORTOOLFABRICATION

Figure 5-6. Aileron Rigging Tool

Revised: 4/23 84

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PIPER CHEROKEE SERVICE MANUAL

c. Adjust primary and balance cable tension as given in Table V-I by the following
procedure:
1. Remove the two front seats, if desired, and the baggage area floor panel of the
PA-28-140 airplanes or the bottom of the rear seat of the PA-28-150, -160, -180; PA-28-235
and PA-28R airplanes to facilitate in the necessary operation.
2. Loosen the connecting bolts of the idler cross-over sprockets at the control tee
bar to allow the chain to fit snug around the control wheel sprockets,and-over the idler
sprockets.
3. Ascertain that both bellcranks are at neutral position.
4. Adjust the turnbuckles, located in the access opening just aft of the main spar,
of the primary and balance cables to their proper cable tension and maintain neutral-center
position of the control wheels. To obtain neutral position of both control wheels, it may
also be necessary to adjust the roller chain turnbuckle located between the control wheel
sprockets. During adjustment, obtain a little more tension on the primary control cables to
hold the bellcranks in neutral against the rigging tools, finishing with even tension on all
cables.
5. Tighten the bolts to secure the idler cross-oversprockets.
6. Remove the aileron bellcrank riggingtool from each wing.
d. Check the ailerons for correct travel from neutral perdimensions givenin Table V-I,
by the following procedure:
1. Center the bubble of a protractor over the surface of an aileron at neutral
position and note the reading.
2. Move the aileron full up and down, checking the degree of travel for each direction.
The degree of travel on the protractor is determined by taking the difference between the
protractor reading at neutral and up, and neutral and down. The bubble must be centered at
each reading. When measuring down travel from the neutral position, maintain a light up
pressure at the center of the aft edge of the aileron. When measuring up travel from the
neutral position, maintain a light down pressure at the center of the aft edge of the aileron;
just sufficient to remove the slack between the bellcrank and the aileron.
3. Should the travel not be correct, the travel may be set by rotating the bellcrank
stops in or out. Stops are located in the wing attached to the rib that is adjacent to the
aileron bellcrank.
4. Repeat this procedure for the other aileron.
e. Check to insure that the left aileron up and right aileron down stops are contacted
simultaneously and vice versa. Adjust stops as required.
f. Check the bellcrank stops to assure that the bellcrank contact is made
simultaneously, but still have cushion before contacting the control wheel stops. Maintain
.030 to .040 clearance between sprocket pin and adjustable stop bolts on models having
adjustable tee bar stops.
g. Check complete system for operation and safety of turnbuckles, bolts, etc.
h. Install accessplates and panels.

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5-13. ADJUSTMENT OF AILERON TRIM. (PA-28-150, -160, -180, Serial Nos. 28-1 to'
28-1321 incl.) Lateral trim can be effected on the ground by adjusting the metal tab attached
to the trailing edge of the left aileron.

NOTE
When an out of trim condition persists despite all the rigging
corrections that can be made, there is a possibility that the
trailing edge of the aileron has been used to move the aircraft
forward. This can result in a slight bulging of the aileron
contour at the trailing edge which will cause an out of rig
condition that is very difficult to correct.
5-14. STABILATORCONTROLS.

5-15. REMOVALOF STABILATORCONTROL CABLES. (Refer to Figure 5-8.)
a. To remove either the forward or aft stabilator cables, first remove the accesspanel
to the aft section of the fuselage located in the baggage compartment, the two front seats,
and the baggagearea floor panel on the PA-28-140 airplanes or the bottom of the rear seat
on the PA-28-150, -160, -180; PA-28-235 and PA-28R airplanes.
b. Disconnect the desired control cable at the turnbuckle in the aft section of the
fuselage.
c. Either forward stabilator cable (2 or 3) may be removed by the followingprocedure:
1. Remove the tunnel carpet and cover plate by the followingprocedure:
(a) PA-28-140; PA-28-150, -160, -180 and PA-28R:
Remove the rudder trim control knob and trim cover attaching screws.Roll back the carpet
from the tunnel and remove the tunnel plate that is located just aft of the tee bar assembly
by removing the plate attaching screws.
(b) PA-28-235:
Remove the fuel selector and rudder trim covers by removing the knobs and the attaching
screws. Disconnect the fuel indicator control lever from the fuel selector torque tube by
removing the attaching pin located at the bottom of the lever. Remove the tunnel plate
located just aft of the tee bar by laying back enough tunnel carpet to remove the plate
attaching screws.
2. If the right (upper) stabilator control cable (2) is to be removed, remove the
cotter pin guards at the pulley(2) located in the forward area of the tunnel.
3. Disconnect the cables (2 and 3) from the lower end of the tee bar on PA-28-140;
PA-28-150, -160, -180 and PA-28-235 or from the idler arm on the PA-28R by removing
cotter pin, nut, washer and bolt (15).
4. Within the access opening aft of the main spar, remove the cable rub blocks that
are attached to the spar housing by removing the block attaching screws.
5. Remove the cotter pin cable guard at the pulley cluster located in the aft area
the access opening aft of the main spar.

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2B2

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A641

Refer to Figure 5-24 for tool fabrication

Figure 5-7. Stabilator RiggingTool
NOTE
To facilitate in the installation of control cables, a line may
be attached to the cable end prior to removal.
6. Draw the cable aft through the floor tunnel.
d. Either aft stabilator control cable (4 or 5) may be removed by the following
procedure:
1. Disconnect the cable end at the balance arm (18) of the stabilator by removing
the cotter pin, nut, washer and bolt (8).
2. Remove the cotter pin cable guard at the pulley (7) located either above or
below the balance arm.
3. Remove the cable from the airplane.
5-16. INSTALLATIONOF STABILATORCONTROLCABLES. (Refer to Figure 5-8.)
a. The forward stabilator cables (2 and 3) may be installed by the followingprocedure:
1. Draw the control cable through the floor tunnel. Ascertain that the right (upper)
cable (2) is routed around the pulley(s) (14) in the forward area of the floor tunnel.
2. Connect the cables (2 and 3) to the lower end of the control column tee bar (1)
or the idler arm with bolt, washer,nut and cotter pin (15). Allow the cable ends freedom to
rotate.
3. If the aft control cable (4 or 5) is not installed,install per step b.
4. Connect the control cable to the aft cable at the turnbuckle (16) in the aft
section of the fuselage.
5. For the right control cable (2), install the cotter pin cable guards at the pulley(s)
(14) in the forward area of the tunnel.
6. Within the access opening aft of the main spar, install the cable rub blocks (10)
to the spar housing and secure with screws.

Revised: 4 23 84

2B3

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0

PIPER CHEROKEE SERVICE MANUAL

7. In the accessopening, install the cotter pin cable guard at the pulley cluster (6).
8. Set cable tension and check riggingand adjustment per paragraph 5-17.
9. Install the floor tunnel plate and trim covers by the following procedure:
(a) PA-28-140;PA-28-150,-160, -180 and PA-28R: Place the tunnel plate into
position for installation and secure with the attaching screws. Roll the carpet
into place and install the rudder trim cover and knob.
(b) PA-28-235: Install the floor tunnel plate and secure with the attachment
screws. Fasten the tunnel carpet into place and install the fuel selector lever
on the selector torque tube and secure with a clevis pin and cotter pin.
Replace the fuel selector and rudder trim covers and the rudder trim knob.
10. Install the front seats and rear seat bottom on floor panel.
b. Either aft stabilator control cable (4 or 5) may be installed by the following
procedure:
1. Route the cable (4 or 5) around its pulley (7) located either over or under the
balance arm (18) of the stabilator.
2. Connect the cable to the stabilator balance arm and secure with bolt, washer,
nut and cotter pin (8). (Insure bushing is installed with bolt.)
3. Connect the cable to the forward cable at the turnbuckle (16) in the aft section
of the fuselage. The upper aft cable (5) connects to the right forward cable (2) and the
lower cable (4) to the left cable (3).
4. Install the cotter pin cable guard at the pulley (7), where required.
5. Set cable tension and check riggingand adjustment per paragraph 5-17.
6. Install the seats and accesspanels.
5-17. RIGGINGAND ADJUSTMENTOF STABILATORCONTROLS.
a. Level the airplane. (Refer to Leveling,Section II.)
b. To check and set the correct degree of stabilator travel, the following procedure may
be used:
1. Check the stabilator travel by placing a rigging tool on the upper surface of the
stabilator as shown in Figure 5-7. (This tool may be fabricated from dimensions given in
Figure 5-24.)
2. Set on a bubble protractor the number of degree up travel as givenin Table V-I
and place it on the riggingtool. Raise the trailing edge of the stabilator and determine that
when the stabilator contacts its stops, the bubble of the protractor is centered.
NOTE
The stabilator should contact both of its stops before the
control wheel contacts its stops.
The neutral position of the stabilator is with the stabilator
chord line parallel with the top of the front seat tracks.

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PIPER CHEROKEE SERVICE MANUAL

3. Set on the protractor the number of degrees down travel as given in
Table V-I and again place it on the rigging tool. Lower the trailing edge of the
stabilator and determine that when it contacts its stops, the bubble of the protractor is centered.
4. Should the stabilator travel be incorrect in either the up or down position, remove the tail cone fairing by removing the attaching screws and with the
use of the rigging tool and bubble protractor turn the stops located at each stabilator hinge in or out (Refer to Figure 5-16. )to obtain the correct degree of travel
5. Ascertain that the lock nuts of the stop screws are secure and reinstall
the tail cone fairing.
c. To check and set stabilator control cable tension, the following procedure
may be used:
1. Ascertain that the stabilator travel is correct.
2. Remove the access panel to the aft section of the fuselage.
3. Secure the control column in the near forward position. Allow onequarter inch between the column and the stop bumper
4. Check each control cable for the correct tension as given in Table V-I.
5. Should tension be incorrect, loosenthe turnbuckle of the lower cable in
the aft section of the fuselage and adjust the turnbuckle of the upper cable to obtain correct tension. Cable tension should be obtained with the control wheel at
the one-quarter inch dimension from the stop and the stabilator contacting its
stop.
6. Check safety of all turnbuckles and bolts.
7. With the tension of the upper, cable correct and the control wheel still
forward, adjust the turnbuckle of the lower cable to obtain correct tension.
8. Check the full travel of the control wheel with relation to the full travel
of the stabilator to determine that the stabilator contacts its stops before the
control wheel contacts its stops. With the control wheel in the fore and aft positions, the travel distance from the point where the stabilator contacts its stops
and the control wheel contacts its stops should be approximately equal. Readjust
turnbuckles if incorrect.
9. Reinstall access panels.
d. Remove the airplane from jacks.

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5-18.

STABILATOR TRIM CONTROLS. (OVERHEADTRIM.)
NOTE
If the airplane involved is equipped with a single stabilator trim cable (one turnbuckle),it will be necessary
to follow the combined instructions for removal of both
forward and aft cables.

5-19. REMOVAL OF STABILATOR TRIM ASSEMBLY. (FORWARD.)(Refer to Figure 5-9.)
a. Rotate the stabilator trim crank to bring the indicator to full aft (extreme
nose high) position to facilitate removal of the trim indicator from the panel.
b. Remove the spring clip from the stabilator trim crank handle and remove
the handle.
c. Remove the headliner trim panel (light panel) from around the trim crank
assembly by the following procedure:
1. Remove the attaching screws that secure the panel.
2. Disconnect the light wires at the quick disconnects.
NOTE
It is recommended that the wires be marked for identification before removal.
3. Remove the panel.
d. Remove the access panel at the aft wall of the baggage compartment to gain
entry to the aft section of the fuselage.
e. Install a cable block on the aft trim control cables, as shown in Figure 5-10.
f. Disconnect the stabilator trim cable(s) at the turnbuckle(s) located in the
aft section of the fuselage.
g. Remove the cable guard pins from the pulleys located at stations 108.16
and 138.33. Station 138.33 is accessible through the zipper on the aft area of
the headliner.
h. Remove the clevis pin cable guard from the trim crank assembly.
NOTE
To facilitate installation, it is recommended that a
line be attached to the cable end prior to removal.

Reissued: 1/15/81

2B7

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PIPER CHEROKEESERVICE MANUAL

1761

STABILATOR TRIM CRANK
STABILATOR TRIM PULLEY
3. TRIM INDICATOR TEE SPRING
4. TRIM INDICATOR TEE ASSEMBLY
5. TRIM INDICATOR WIRE
6. STABILATOR TRIM CONTROL CABLE
7. STABILATOR TRIM CABLE IDLER PULLEY
8. TURNBUCKLE BARREL
9. STABILATOR TRIM UPPER SUPPORT ASSEMBLY
10. TRIM SHAFT PULLEY
1.

2.

PA-20-150-160-180
SERIAL NOS. 2B-1

TO 2B-1410

INCL.

PA-28-140 SERIAL NOS. 2-20002
TO 28-20656 INCL.
PA2-2-140-160-10
SERIAL NOS. 28-141
TO 21-2 171
PA-28-235 SERIAL NOS. 21-10003 TO 28-10605 INCL.

1751

T

PA-2B-140
SERIAL NOS. 28-20657
AND UP
PA-2-150-160-180
SERIAL NOS. 28-2172
TO 28-9377
PA-28-235
SERIAL NOS. 28-1060
TO 28-10719
INCL.

Figure 5-9.

Reissued:1/15/81

INCL.

Stabilator Trim Control (Overhead Control)

2B8

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PIPER CHEROKEE SERVICE MANUAL

i. Remove the cable from the airplane.
j. The trim crank and pulley assembly
mounting bracket attaching screws.

may be removed

by removing

the

5-20. INSTALLATION OF STABILATORTRIM ASSEMBLY. (FORWARD.)
(Refer to Figure 5-9.)
a. If the trim crank and pulley assembly has been removed, install assembly
and secure with attachment screws.
b. Install the forward stabilator trim cable using the following procedure:
1. Attach a line to the right end of the control cable and pull the cable forward to the crank assembly.
2. Route the cable clockwise (as view from the underside) around and into
the top groove of the crank pulley, and on to the left side of the idler pulley.
3. From around the idler pulley, route the cable around and in the bottom
groove of the crank pulley.
4. With the use of a line attached to the cable end, pull the cable through
to the turnbuckle located in the aft section of the fuselage.
c. Attach the cable ends together and install guard pins in the pulley assemblies.
d. Insert the guard pin in the trim bracket assembly and safety with a cotter
pin.
e. Actuate the trim crank fore and aft several times to seat the cables into
the pulleys.
f. Rig and adjust in accordance with paragraph 5-23.
g. Replace all the access plates and panels.
h. Install the headliner trim panel by connecting the electrical leads and installing attaching screws.
i . Replace the trim handle and secure with the snap ring.
5-21. REMOVAL OF STABILATORTRIM CONTROLS. (AFT.)
(Refer to Figure 5-9.)
a. PA-28-150,-160,-180,
Serial Nos. 28-1 to 28-1410 incl. (The exception
being airplanes with Piper Kit No. 756 930 Stabilator Trim Modifications installed. Airplanes with this kit installed, refer to step c.)
1. Remove the tail cone fairing by removing attaching screws.
2. Remove the access panel located at the aft wall of the baggage compartment to allow access to the aft section of the fuselage.
3. To remove the trim control cable, proceed as follows:
(a) Disconnect the cable at the turnbuckle (8) in the aft section of the
fuselage.

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A977

Figure 5-10.

Methods of Securing Trim Cables

(b) Remove the cable guard pin from the pulleys located within the fuselage at station 228.30.
(c) Remove the cable guard from the top support brace of the trim
mechanism located just aft of the trim screw pulley.
(d) Remove the cotter pin cable guard at the idler pulley (18) which is
attached to the aft side of the rearward most bulkhead of the fuselage.
(e) Draw the cable aft around the trim screw pulley (10) and then forward.
(f) Removethe forward portion of the cable as givenin paragraph5-19.
4. The trim mechanism may be disassembled and removed from the aft
bulkhead of the fuselage as follows:
(a) Disconnect the trim tab control arm (15) from its support bracket
by removing nuts, washers, bushings and bolts.
(b) Disconnect the trim indicator cable (17) from the trim screw trunnion (12) by removing attaching nut, washer and screw. Remove the cotter pin
cable guard at the cable pulley (10) located directly below the trunnion.
(c) Remove the trim mechanism assembly (11) by removing the nut,
washer and bolt at each support brace (20) attachment point, and at the aft most
fuselage bulkhead.
(d) Disassemble the trim mechanism by removing the cotter pin, washer
and nut located at each end of shaft assembly, and pulling the supports with
washers from the shaft.
(e) Disassemble the shaft by removing the roll pins from the desired
component.

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b. PA-28-140, Serial Nos. 28-20002 to 28-20656 incl; PA-28-150, -160, -180,
Serial Nos. 28-1411 to 28-2171 incl. and PA-28-235, Serial Nos. 28-10603 to
28-10605 incl. (The exception being those airplanes with Piper Kit No. 756 896
Stabilator Trim Modification installed. Airplanes with this kit installed, refer
to step c.)
1. Remove the tail cone fairing by removing attaching screws.
2. Remove the access panel located at the aft wall of the baggage compartment to allow access to the aft section of the fuselage.
3. To remove the trim control cable, proceed as follows:
(a) Disconnect the cable at the turnbuckle (8) in the aft section of the
fuselage.
(b) Remove the cable guard pin from the pulleys located within the
fuselage at station 228.30.
(c) Disconnect the links (19), located between the trim screw (11) and
control arm (15) at the trim screw, by removing nut, washers, bushing and bolt.
(d) Remove the cotter pin that extends through the top of the trim screw
and the cable guard pin located just aft of the trim barrel (10).
(e) Remove the cotter pin cable guard at the idler pulleys which are
attached to the aft side of the rearward most bulkhead.
(f) Turn the screw down and out from the underside of the barrel.
(g) Remove the snap ring, washer and thrust washer from the bottom
of the barrel.
(h) Disconnect the diagonal and horizontal trim assembly support ribs
from one another by removing their four attaching nuts, washers and bolts.
(i) Loosen the bolts where the horizontal ribs attach to the fuselage
bulkhead, raise the aft end of the ribs, and move the barrel (21) aft far enough
to unwrap the trim cable from around the barrel and idler pulleys (18).
(j) Remove the forward portion of the cable (6) as given in paragraph
5-19.
4. The horizontal and diagonal support ribs may be removed by removing
the cotter pin cable guard at the trim indicator cable pulley located on the diagonal
rib, and removing the attaching nuts, washers and bolts that secure the ribs to
the aft bulkhead.
c. PA-28-140, Serial Nos. 28-20657 and up; PA-28-150,-160,-180,
Serial
Nos. 28-2172 to 28-9377 incl. and PA-28-235, Serial Nos. 28-10606 to 28-10719
incl.
1. Remove the tail cone fairing by removing attaching screws.
2. Remove the access panel located at the aft wall of the baggage compartment to allow access to the aft section of the fuselage.
3. To remove the trim control cable, proceed as follows:
(a) Block the first set of pulleys forward of the cable turnbuckles (8) in
the aft section of the fuselage by the method shown in Figure 5-10.

Reissued: 1/15/81

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PIPER CHEROKEE SERVICE MANUAL

(b) Remove the cable guard pin from the pulleys located withinthe fuselage at station 228.30.
(c) Disconnect the links (19), located between the trim screw (11) and
control arm (15) at the trim screw by removing nut, washers and bolt.
(d) Remove the cotter pin that extends through the top of the trim screw
and the cable guard pin located just aft of the trim barrel (21).
(e) Turn the screw down and out from the underside of the barrel.
(f) Remove the snap ring, washer and thrust washer from the bottom
of the barrel.
(g) Disconnect the diagonal and horizontal (20) trim assembly support
ribs from one another by removing their four attaching nuts, washers and bolts.
(h) Loosen the attaching bolts where the horizontal ribs attach to the
fuselage bulkhead, raise the aft end of the ribs and remove the barrel with cable.
Draw the cable from the fuselage.
4. The horizontal and diagonal support ribs may be removed by removing
the cotter pin cable guard at the trim indicator cable pulley located on the diagonal rib, and removing the attachment nuts, washers and bolts that secure the ribs
to the aft bulkhead.
d. The trim indicator cable(17) may be removed from the aft area of the fuselage by disconnecting the cable from the trim screw trunnion or at the lower end
of the trim screw (11), removing the cotter pin cable guard at the pulley located
below the trim screw and disconnecting the cable from the indicator wire.
5-22. INSTALLATION OF STABILATOR TRIM CONTROLS. (AFT.)
(Refer to Figure 5-9.)
a. PA-28-150,-160, -180, Serial Nos. 28-1 to 28-1410' incl. (The exception
being airplanes with Piper Kit No. 756 930, Stabilator Trim Modification, installed. Airplanes with this kit installed, refer to step c.)
1 The trim mechanism may be assembled and attached to the aft bulkhead
of the fuselage as follows:
(a) Assemble the trunnion (12), stops and pulley (10) in the trim shaft
and secure with roll pins.
(b) Assemble the trim mechanism by placing an AN960-516L washer
followed by a support on each end of the shaft assembly (11). Install washers and
nuts, check freedom of rotation of the shaft with no end play and then secure nuts
with cotter pins.
(c) Align the attachment hole of each support brace with those of the
aft bulkhead, install bolts and secure with washers and nuts.
(d) Draw the trim cable and attach the end to the trim screw trunnion,
and secure with bolts, nut and washer. With the cable placed around the pulley
located directly below, the trunnion, install the cotter pin cable guard at the pulley.

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2. The trim control cable may be installed by the following procedure:
(a) Install the forward portion of the cable as givenin paragraph 5-20.
(b) With the forward portion installed, route the long length (the long
length should be the left end of the cable) aft, counterclockwise around to the top
groove of the trim pulley (10), around the idler pulley (18), back around the bottom groove of the trim pulley and forward to the inside of the fuselage.
(c) Draw the cable end forward and connect it with its mating end within
the fuselage.
(d) Ascertain that the cable is seated in the groove of each pulley, and
install the cotter pin cable guards at the pulleys located within the fuselage at
station 228.30 and at idler pulley at the aft fuselage bulkhead.
(e) Install the cable guard at the top support brace located just aft
the trim screw pulley.
3. The trim indicator cable may be installed by attaching one end to the
trim screw trunnion. (Refer to Figure 5-9 for correct location.) Loop the cable
around the pulley below the trim screw; Install the cotter pin cable guard at the
pulley. Attach other end of the cable to the indicator wire, and at the same time
make adjustments given in paragraph 5-23.
4. Set cable tension and check rigging and adjustment per paragraph 5-23.
Check safety of turnbuckle.
5. Install tail cone fairing and secure with screws.
6. Install the access panel to the aft section of the fuselage.
b. PA-28-140, Serial Nos. 28-20002 to 28-20656 incl; PA-28-150, -160, -180,
Serial Nos. 28-1411 to 28-2171 incl. and PA-28-235, Serial Nos. 28-10003 to
28-10605 incl. (The exception being those airplanes with Piper Kit No. 756 896,
Stabilator Trim Modification, installed. Airplanes with this kit installed, refer
to step c.)
1. Ascertain that the trim barrel bushings are lubricated and installed in
the rib plate and clip.
2. Attach the horizontal (20) and diagonal support ribs to the aft bulkhead
of the fuselage with bolts, washers and nuts. Start nuts only a few threads so as
to allow ribs to hang loose. Do not connect the ribs at this time.
3. Install the forward portion of the cable as given in paragraph 5-20.
4. Wrap the trim cable around the barrel(21)and idler pulley (18). To do
this, hold the barrel next to the aft end of the support braces and wrap, bringing
the end of the long length(The long length should be the left end of the cable.) aft
to the left side of the trim barrel, around the bottom groove of the idler pulley,
then continuing to wrap in this direction until all grooves are filled.
5. Install the trim barrel (21) in the bushing between the horizontal and
diagonal ribs, and then attach the ribs, securing with bolts, washers and nuts.
Tighten bolts where the ribs attach to the aft bulkhead.

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2B13

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PIPER CHEROKEE SERVICE MANUAL

6. Install the thrust washer,

washer and snap ring on lower end of the

barrel.
7. Install the trim screw in the barrel and secure each end with a cotter
pin through the screw.
8. Draw the cable end forward and connect it with its mating end within
the fuselage.
9. Ascertain that the cable is seated in the groove of each pulley and install the cotter pin cable guards at the pulleys located within the fuselage at station 228.30 and at the idler pulley at the aft fuselage bulkhead.
10. Set cable tension and check rigging and adjustment per paragraph 5-17.
Check safety of turnbuckle.
11. The trim indicator cable may be installed by attaching one end to the
lower end of the trim screw (Refer to Figure 5-9 for correct location.) and looping the cable around the pulley below thetrim screw. Install the cotter pin cable
guard at the pulley. Attach other end of the cable to the indicator wire, and at
the same time make adjustments given in paragraph
23.
12. Install tail cone fairing and secure with screws.
13. Install access panel to the aft section of the fuselage.
c. PA-28-140, Serial Nos. 28-20657 and up; PA-28-150,-160,-180, Serial No.
28-2172 to 28-9377 incl. and PA-28-235, Serial Nos. 28-10606 to 28-10719 incl.
1. Ascertain that the trim barrel bushings are lubricated and installed in
the rib plate and clip.
2. Attach the horizontal (20) and diagonal support ribs to the aft bulkhead
of the fuselage with bolts, washers and nuts. Start nuts only a few threads so as
to allow ribs to hang loose. Do not connect the ribs at this time.
3. Wrap the trim barrel (21). To do this, first lay the center (as measured equally from each end to the center of the cable) of the trim cable in the slot
of the barrel. Bring the upper cable through the diagonal slot in the flange at the
upper end of the barrel and wrap down in a counterclockwise direction. Bring the
lower cable through the diagonal slot in the lower end of the barrel and wrap up
in a clockwise direction. Wrap the cable as evenlyas possible to obtain 23 wraps
on the barrel as viewed from the side opposite the slot and with the cables extending out from the slotted side.
4. Block both cables by clamping them between two pieces of wood laid next
to the wraps to prevent them from unwrapping. (Refer to Figure 5-10.)
5. Install the barrel in the bushings between the horizontal and diagonal
ribs, and then attach rib securing with bolts, washers and nuts. Tighten bolts
where the ribs attach to the aft bulkhead.
6. Install the thrust washer, washer and snap ring on the lower end of the
barrel.
7. Install the trim screw (11) in the barrel and secure each end with a cotter pin through the screw.

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PIPER CHEROKEE SERVICE MANUAL

8. Route the cable ends into the fuselage and attach the ends to the mating
end of the forward cable.
9. Remove the blocks holding the forward cable tight and the aft cables at
the barrel.
10. Set cable tension and check rigging and adjustment per paragraph 5-23.
Check safety of turnbuckles.
11. The trim indicator cable may be installed by attaching one end to the
lower end of the trim screw (Refer to Figure 5-9 for correct location.) and loopingthe cable around the pulley below the trim screw. Install the cotter pin cable
guard at the pulley. Attach other end of the cable to the indicator wire, and at
the same time make adjustments given in paragraph 5-23.
12. Install tail cone fairing and secure with screws.
13. Install the access panel to the aft section of the fuselage.

5-23. RIGGING AND ADJUSTMENT OF STABILATOR TRIM.
(OVERHEAD CONTROL.)
a. PA-28-150, -160, -180, Serial Nos. 28-1 to 28-1410 incl. (The exception
being those airplanes with Piper Kit No. 756 930, Stabilator Trim Modification,
installed. Airplanes with this kit installed, refer to step b.) (Refer to Figure
5-9.)
1. Level the airplane. (Refer to Leveling, Section II.)
2. Check for proper stabilator trim cable tension as given in Table V-I.
If the cables were disconnected, rotate control crank (1) several times to allow
the cables to seat and recheck tension.
3. Position the stabilator against its down stop. Ascertain that the stabilator travel is correctly set according to Table V-I.
4. Turn the trim crank until the aft end of the turnbuckle of the right trim
cable is positioned approximately one-half inch forward of the double pulley cluster at the top of the rear bulkhead at station 228.3.
5. Check that the trim screw trunnion (12) is turned down until it contacts
the top of the lower screw stop of the trim assembly
If the trunnion is not contacting the stop, and the fork (14) between the trim support bracket (13) and the
trim control arm (15) is not disconnected, -disconnect the arm from the tab by
removing the connecting bolts. With the turnbuckle still at the one-half dimension from the pulley, turn the screw down until the trunnion contacts the stop.
6. With the stabilator positioned against its down stop, adjust the trim
actuating arm until the trailing edge of the tab aligns with the trailing edge of the
stabilator.
Adjust by loosening the jam nut on the fork of the control arm and
turning the fork in or out as required.
7. Connect the control arm to the tab and secure with bolts.

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2B15

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PIPER CHEROKEE SERVICE MANUAL

8. Move the stabilator to the neutral position and secure. To find neutral,
place a rigging tool on the upper surface of the stabilator as shown in Figure 5-8.
Zero a bubble protractor, set it on the rigging tool and tilt the stabilator until
the bubble is centered.
9. Turn the trim crank until the trailing edge of the tab aligns with the
trailing edge of the stabilator.
10. Check the bubble of the protractor over the neutral tab and then check
tab travels as given in Table V-I. The degree of travel on the protractor is determined by taking the difference between the protractor reading at neutral and
up, and neutral and down. The bubble must be centered at each reading with the
airplane level.
11. To obtain correct travels, if incorrect, adjust by disconnecing the actuating arm and turning it in or out as required.
Reconnect the arm to the tab.
12. Secure the jam nut against the fork.
13. Turn the trim wheel to full travel and check for turnbuckle clearance
and location of tab indicator.
b. PA-28-140;PA-28-150, -160, -180, Serial Nos. 28-1411 to 28-4377 incl. and
PA-28-235, Serial Nos. 28-10003 to 28-10719 incl. (Refer to Figure 5-9.)
1. Level the airplane.
(Refer to Leveling, Section II.)
2. Check for proper stabilator trim cable tension as given in Table V- .
If the cables were disconnected, rotate control crank (1) several times to allow
the cables to seat and recheck tension.
3. Position the stabilator against its down stop. Ascertain that the stabilator travel is correctly set according to Table V-I.
4. Turn the trim crank until the aft end of the turnbuckle of the right trim
cable is positioned approximately one-half inchforward of the double pulley cluster at the top of the rear bulkhead at station 228.3.
5. Check that the trim screw is turned down until the cotter pin stop in the
top of the screw is contacting the plate (9) on the horizontal support rib (20) of
the trim assembly. If the stop is not contacting the plate, and the links between
the screw (11) and the trim control arm (15) are not disconnected, disconnect the
two by removing the connecting nut, washer and bolt. With the turnbuckle still
at the one-half dimension from the pulley, turn the screw down until the pin contacts the plate.
6. Withthe stabilator positioned against its down stop, adjust thetrim actuating arm until the trailing edge of the tab aligns with the trailing edge of the
stabilator. Adjust by loosening the jam nut on the end bearing of the control arm
and turning the bearing in or out as required.
7. Connect the links to the control arm and secure with bolt, washers and
nut.

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2B16

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PIPER CHEROKEE SERVICE MANUAL

8. Move the stabilator to the neutral position and secure. To find neutral,
place a rigging tool on the upper surface of the stabilator as shown in Figure
5-8. Zero a bubble protractor, set it on the rigging tool and tilt the stabilator
until the bubble is centered.
9. Turn the trim crank until trailing edge of the tab aligns with the trailing edge of the stabilator.
10. Check the bubble of the protractor over the neutral tab and then check
tab travels as given in Table V-I. The degree of travel on the protractor is determined by taking the difference between the protractor reading at neutral and
up, and neutral and down. The bubble must be centered at each reading with the
airplane level.
11. To obtain correct travels, if incorreci, adjust by disconnecting the links
at the actuating arm rod end and turning the end in or out as required. Reconnect
links to rod end.
12. Secure the jam nut on the actuating arm rod end.
13. Turn the trim wheel to full travel and check for turnbuckle clearance
and location of tab indicator.

5-24.

STABILATOR TRIM CONTROLS. (FLOOR TRIM.)

5-25. REMOVAL OF STABILATOR TRIM ASSEMBLY. (FORWARD.)
(Refer to Figure 5-11.)
a. To remove the trim control wheel assembly and/or the trim control cables,
first remove the panel to the aft section of the airplane.
b. If the aft trim cable (12) is not to be removed, block the cables atthe pulleys
(13) inthe upper aft section of the fuselage to prevent them from unwrappingfrom
the trim drum. (Refer to Figure 5-10.)
c. Loosen the cables if the trim control wheel (1) is to be removed or disconnect if the cables are also to be removed. Do this at the trim cable turnbuckles
(10 and 11) in the aft section of the fuselage.
d. The control wheel (1) with drum (3) may be removed by the following procedure:
1. Remove the control wheel cover by removing the cover attaching screws.
2. The wheel assembly may be removed from its mounting brackets by
removing nut, washer and bolt (7) that secures the wheel between the brackets.
Draw the wheel from the brackets.
Use caution not to damage trim indicator
wire (2).
3. Unwrap the left cable (9) from the drum.
4.. The wheel and drum are joined by a push fit, separate these two items
with their center bushing and unwrap the right cable (8).

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2B17

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PIPER CHEROKEE SERVICEMANUAL

C339

28

9

1.
2.
3.
4.
5

a

CONTROL WHEEL TRIM
INDICATOR TRIM POSITION
DRUM, TRIM CABLE
MOUNTING BRACKET
CLEVIS PIN, WASHER & COTTER PIN
6.
PULLEY CLUSTER
BOLT, BUSHING, WASHER & NUT
CABLE, RIGHT FORWARD
9. CABLE, LEFT FORWARD
10.. TURNBUCKLE, RICHT
TURNBUCKLE, LEFT
11.
12. CABLE, AFT
PULLEY CLUSTER
13.
14
BOLT, BUSHING, WASHER (3) & NUT
15. GUARD-BOLT, BUSHING, WASHER & NUT
RIB, HORIZONTAL SUPPORT
16
17. PLATE, RIB
18. GUARD

Figure 5-11.

Reissued:1/15/81

19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.

BUSHING, BARREL
BARREL, TRIM
CLIP, DIAGONAL RIB
RIB, DIAGONAL SUPPORT
SCREW, TRIM
BOLT, WASHER (2) & NUT
LINK
ROD END
JAM NUT
ARM, TRIM CONTROL
BUSHING BARREL
WASHER, THRUST
WASHER, SPACER
SNAP RING
PULLEY CLUSTER
PULLEY CLUSTER
BOLT, WASHER & NUT
GUARD, CABLE
RUB BLOCK

Stabilator Trim Control (Floor Control)

2B18

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PIPER CHEROKEE SERVICE MANUAL

5. Tie the cables forward to prevent them from slipping back into the floor
tunnel.
e. The trim control cables (8 and 9) may be removed by the following procedure:
1 . Remove the rear seat bottom or floor panel, whichever applies, and the
front seats, if desired.
2. Unfasten the carpet from the aft portion of the floor tunnel and lay it
forward.
3. Remove the tunnel cover located between the trim control wheel and the
spar cover by removing attaching screws.
4. Remove the cable pulleys (6) located in the tunnel by removing the cotter
pin, washer and clevis pin (5).
5. Remove the cable rub blocks (37) located on the aft side of the main spar
by removing the block attaching screws.
6. Remove the cable guard pin (36) at the pulley cluster (34) located just
aft of the wing flap torque tube at station 127.25.
7. If installed, remove the cable pulleys (33) within the aft section of the
fuselage at station 156.5 by removing nut, washer, bushing and bolt.
8. With the cables disconnected from the trim control wheel, draw the
cable(s) through the floor tunnel.

5-26. INSTALLATION OF STABILATOR TRIM ASSEMBLY. (FORWARD.)
(Refer to Figure 5-11.)
a. The trim control wheel with drum may be installed by the following procedure:
1. Wrapthe right trim cable on the trim drum byinsertingthe swaged ball
of the cable in the slot provided in the side (right side) of the drum that mates
with the control wheel, and looking at this side, wrap the drum with three wraps
of the cable in a clockwise direction.
2. Attach the control wheel to the cable drum by aligning the long lug of
the drum with the long slot of the wheel and pushing the two pieces together.
3. Wrap the left trim cable on the drum by inserting the swaged ball of the
cable in the slot provided in the flanged side (left side) of the drum and looking
at this side, wrap the drum with three wraps of the cable in a clockwise direction.
4. Lubricate and install the bushing in the control wheel and drum.
5. Alignthe controlcables andpositionthe control wheel assembly between
its mounting brackets. Ascertain that the end of the trim indicator wire is positioned in the spiraled slot of the drum withno bind on the end. Install the retainer
bolt from the left side and install washer and nut.
6. Install the cover over the control wheel and secure with screws, unless
the control cables have yet to be installed.

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PIPER CHEROKEE SERVICE MANUAL

...

b. The trim control cables may be installed by the following procedure:
1. Draw the cable(s) through the floor tunnel.
2. Wrap the cable drum and install the trim control wheel as given in
step a.
3. Position the cable pulleys on their mounting bracket within the floor
tunnel and install the clevis pin, washer and cotter pin.
4. Connect the cable to the aft cable at the turnbuckle in the aft section of
the fuselage. Install aft cable if not installed.
5. If previously installed, install the pulleys in the aft lower section of the
fuselage at station 156.5 forward of the cable turnbuckles.
6. Install the cable guard atthe underside of the pulleys located just aft of
the flap torque tube at station 127.25 and secure.
7.. Install the cable rub blocks located on the aft side of the main spar
housing and secure with screws.
8. Remove the blocks that secure the aft trim cable and check that the
cables are seated on their pulleys.
c. Set cable tension and check rigging and adjustment per paragraph 5-29.
Check safety of all turnbuckles.
d. Install the tunnel cover on the tunnel and secure with screws.
e. Install the carpet over the floor tunnel.
f. Install the cover over the trim control wheel and secure with screws and
special washers.
g. Install the floor panel and seat belt attachments aft of the main spar and
secure panel with screws.
h. Install the panel to the aft section of the airplane and the seats.
5-27. REMOVAL OF STABILATOR TRIM ASSEMBLY. (AFT.)
(Refer to Figure 5-11.)
a. Remove the access panel to the aft section of the fuselage.
b. Block the trim cables at the first set of pulleys (33) forward of the cable
turnbuckles (10 and 11) in the aft section of the fuselage by a method shown in
Figure 5-10.
c. Disconnect the cable (12) at the turnbuckles (10 and 11) in the aft section
of the fuselage.
d. Remove the tail cone by removing its attaching screws.
e. Disconnect the link (25) between the trim screw (23) and the trim control
arm (28) by removing the nut, washer and bolt (24) that connects the link to the
screw.
f. Remove the cotter pin from the top of the screw (23), and turn the screw
down and out of the barrel (20).

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PIPER CHEROKEE SERVICE MANUAL

g. Remove the snap ring (32), washer (31) and thrust washer (30) from the
bottom of the barrel.
h. Disconnect the diagonal rib (22) from the horizontal rib (16) that supports
the trim assembly by removing the four attaching nuts, washers and bolts.
i. Draw the trim cable (12) from the fuselage.
5-28. INSTALLATION OF STABILATOR TRIM ASSEMBLY. (AFT.)
(Refer to Figure 5-11.)
a. Wrap the trim barrel (20) by first laying the center (as measured equally
from each end to the center of the cable) of the trim cable (12) in the slot of the
barrel. Bring the upper cable through the diagonal slot in the flange at the upper
end of the barrel and wrap down in a counterclockwise direction. Bring the lower
cable through the diagonal slot in the lower end of the barrel and wrap up in a
clockwise direction. Wrap the cable as evenly as possible to obtain 23 wraps on
the barrel as viewed from the side opposite the slot and with the cables extending
out from the slotted side.
b. Block both cables by clamping them between two pieces of wood laid next to
the wraps to prevent them from unwrapping.
c. Ascertain that the barrel bushings (19 and 29) are installed in the rib plate
(17) and clip (21).
d. Lubricate the bushings and install the trim barrel (20) in the bushings between the two support ribs. Attach the bottom diagonal rib (22) to horizontal rib
(16) and secure with bolt, washers and nuts.
e. Install the thrust washer (30), washer (31) and snap ring (32) on the lower
end of the barrel.
f. Install the trim screw (23) in the barrel (20) and secure each end with a
cotter pin through the screw.
g. Route the cables into the fuselage and attach the ends to the forward trim
cables (8 and 9).
h. Remove the blocks that are holding the forward cables tight and aft cables
at the barrel.
i. Set cable tension and check rigging and adjustment per paragraph 5-29.
Check safety of all turnbuckles.
j. Install the tail cone and secure with screws.
k. Install the access panel to the aft section of the fuselage.

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PIPER CHEROKEE SERVICE MANUAL

5-29. RIGGING AND ADJUSTMENT
OF STABILATOR TRIM. (FLOOR
CONTROL.) PA-28-180, Serial Nos. 28-4378 and up; PA-28-235,Serial Nos. 28-10720and
up; and PA-28R. (Refer to Figure 5-11.)
a. Level the airplane.
(Refer to Leveling, Section II.)
b. Check for proper stabilator trim cable tension as given in Table V-I. If
cables were disconnected, rotate control wheel several times to allow the cables
to seat and recheck tension.
c. Secure the stabilator in neutral position. To find neutral, place a rigging
tool onthe upper surface of the stabilator as shownin Figure 5-7. Zero a bubble
protractor, set it on the rigging tool and tilt the stabilator until the bubble is centered.
d. With the stabilator centered, turn the trim wheel (1) until the aft end of the
turnbuckle (10) of the right trim cable (8) is approximately two inches forward of
the double pulleys (13) at the top of the rear bulkhead at station 228.3.
e. Check that the trim screw (23) is turned down until the cotter pin stop in
the top of the screw is contacting the plate (17) on the horizontal support rib (16)
of the trim assembly.
If the stop is not contacting the plate, the links (25) between the screw (23) and the trim control arm (28) are not disconnected, disconnect the two by removing the connecting nut, washers and bolt (24). With the
turnbuckle still at the two inch dimension from the pulley, turn the screw down
until the pin contacts the plate.
f. Check the rod end (26) on the tab actuating arm (28) for approximately six
threads forward of the jam nut (27).
g. Connect the links to the trim screw and secure with bolt, washers and nut.
h. Turn the trim control wheel until the trim tab streamlines with the neutral
stabilator.
i. Check the bubble of the protractor over the neutral tab and then check tab
travels as given in Table V-I. The degree of travel on the protractor is determined by taking the difference between the protractor reading at neutral and up,
and neutral and down. The bubble must be centered at each reading with the airplane level.
j. To obtain correct travels, if incorrect, adjust by disconnecting the links
(25) at the actuating arm rod end (26) and turning the end in or out as required.
Reconnect links to rod end.
k. Secure the jam nut (27) on the actuating arm rod end.
1. Turn the trim wheel to full travel and check for turnbuckle clearance and
location of tab indicator.

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PIPER CHEROKEE SERVICE MANUAL

5-30. RUDDERAND STEERINGPEDALASSEMBLY.
5-31. REMOVALOF RUDDER AND STEERING PEDAL ASSEMBLY.(Refer to Figure
5-12.)
a. Remove the accesspanel to the aft section of the fuselage.
b. Relieve rudder and stabilator cable tension by loosening one of the rudder and
stabilator cable turnbuckles in the aft section of the fuselage.
c. Remove the tunnel plate located just aft of the tee bar assembly by the following
procedure:
1. PA-28-140;PA-28-150,-160,-180 and PA-28R. Remove the rudder trim control
knob, trim cover attaching screwsand trim cover. Roll back the carpet from the tunnel and
remove the tunnel plate that is locatedjust aft of the tee bar assembly by removing the plate
attaching screws.
2. PA-28-235: Remove the fuel selector and rudder trim covers by removing the
knobs and the attaching screws. Disconnect the fuel indicator control lever from the fuel
selector torque tube by removing the attaching pin located at the bottom of the lever.
Remove the tunnel plate located just aft of the tee bar by laying back enough tunnel carpet
to remove the plate attaching screws. d. Disconnect the stabilator control cable from the lower end of the tee bar assembly.
e. Remove the tee bar attaching bolts with their washers and nuts which are through
each side of the floor tunnel. Pull the lower end of the tee bar aft.
f. Disconnect the control cable (19) ends from the arms on the torque tube (3) by
removing the cotter pins, washers,nuts and bolts (20).
g. Disconnect the rudder trim from the torque tube assembly by removing the cotter
pin, washers and bolt that connects the arm to the trim. Remove the cotter pin and clevis
pin from the rudder trim mechanism and remove the mechanism from the mounting
channel. Remove the screw from the engine control bracket assembly and swing it out of
the way. Disconnect the alternate air cable and move aside.
h. Disconnect the steering rods (21) at the rudder (32 and 33) by removing nuts and
bolts (24).
i If airplane is equipped with toe brakes, disconnect the brake cylinders (12) at the
lower end of each cylinder rod (11) by removing the cotter pins, washers, nut and bolts
(20).
j. Disconnect the vee brace(s) (29) (two braces are used with right hand brakes) from
the torque tube by removing nuts, washers and bolts (27) that secure the strap bracket (28)
to the vee brace.
k. Disconnect the torque tube support bracket (35) where it attaches by removing its
attaching bolts.
1. Remove the two bolts (25 and 26) that extend through the torque tube and are
located at the center of the tube assembly over the floor tunnel. Compress the tubes.
Remove the left and right toe brake pedal assembly.

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PIPER CHEROKEE SERVICE MANUAL

1608

14

2.
3.
4.
5.
6.
7.
8.
9.
10.
1I.
12.
13.
14.
15.
16.

TUBE, L. OUTER
TUBE, L. CENTER
TUBE, R. CENTER
TUBE, R. OUTER
PLATE
BOLT & NUT
SUPPORT BLOCK, UPPER
SUPPORT BLOCK, LOWER
WASHER, SPACER
ARM, IDLER
ROD, BRAKE CYLINDER
BRAKE CYLINDER
CLEVIS PIN & COTTER PIN
TUBE, RUDDER CONTROL
CLEVIS ROD
CLEVIS PIN & COTTER PIN

17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.

ROD END
JAM NUT
CONTROL CABLE, RUDDER
BOLT, WASHER, NUT & COTTER PIN
ROD, NOSE WHEEL STEERING
JAM NUT
ROD END, STEERING
BOLT & NUT
BOLT, WASHER & NUT
BOLT, WASHER & NUT
BOLT, WASHER & NUT
BRACKET
VEE BRACE CLEVIS PIN · COTTER PIN
RUDDER PEDAL, L. OUTER
RUDDER PEDAL, L. INNER
RUDDER PEDAL, R INNER
RUDDER PEDAL, R. OUTER
BRACKET, TUBE SUPPORT

N

Figure 5-12.

Reissued: 1/15/81

Rudder and Steering Pedal Assembly

2B24

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PIPER CHEROKEE SERVICE MANUAL

m. Disconnect the torque tube support blocks (7 and 8) from their support brackets on
each side of the fuselageby removing the attaching nuts, washersand bolts (6).
n. Remove the trim side panels,if desired.
o. Rotate the rudder pedal bar assembly toward the cabin door far enough to pull the
right pedal bar out. Rotate the remaining assembly to the left and remove the assembly
from the aircraft. Note the spacers and washers (9) on each end and between the support
blocks.
5-32. INSTALLATION OF RUDDER AND STEERING PEDAL ASSEMBLY.(Refer to
Figure 5-12.)
a. Assemble the torque tube assembly (1, 2, 3 and 4) as shown in Figure 5-12. Do not
at this time install the two bolts (25 and 26) through the center of the tube assembly.
b. Place the upper support blocks (7) on the ends of the torque tube assembly.Note
that a washer (9) is required on each end of the tube.
c. Position the support blocks (7 and 8) on their mounting brackets at each side of the
fuselage and secure with bolts, washers and nuts. Note that a bushing is required in the bolt
holes of the upper support block, a plate on top of the upper block, between the upper and
lower blocks and under the block mounting bracket.
d. Align the bolt holes in the center area of the torque tube assembly,install bolts,
washers and nuts (25 and 26) and tighten.
e. Position the torque tube support bracket (35) on the floor tunnel and secure with
bolts.
f. Position the vee brace(s) (29) on the torque tube, install the strap bracket (28)
around the torque tube and brace and secure with bolts, washers and nuts (27).
g. Check that the rod end (17) on the clevis rod (15) is adjusted to givea dimension of
7.94 inches between hole centers.
h. Connect the ends of the brake cylinder rods (11) and clevis rods (15) to the idler
arms (10) and secure with clevis and cotter pins (13).
i. Connect the steering rods (21) to the rudder pedals (32 and 33) and secure with
bolts and nuts (24). Check steering rod adjustment per Alignment of Nose Gear, Section VII
or VIIA.
j. Connect the rudder trim to the arm of the torque tube and secure with bolt, washer,
nut and cotter pin. A thin washer is installed under the nut which is tightened only finger
tight.
k. Connect the ends of the rudder control cables (19) to the arms provided on the
torque tube and secure with bolts, washers, nuts and cotter pins (20). Allowthe ends free to
rotate.
1. Swing the tee bar into place and secure with attachment bolts, washers and nuts
(15). Insert bolts through each side of the floor tunnel. (See Figure 5-1 or 5-2.)

Reissued: 1/15/81

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SURFACE CONTROLS

PIPER CHEROKEE SERVICE MANUAL

m. Connect the stabilator control cables (11) to the lower end of the tee bar with bolt,
washer and nut (16), and secure with cotter pin. (See Figure 5-1 or 5-2.) Allow the cable
ends to rotate freely.
n. Set rudder cable tension and check rigging and adjustment per paragraph
5-40.
o. Set stabilator cable tension and check rigging and adjustment per paragraph 5-17.
p. Check aileron cable tension.
q. Check safety of bolt and turnbuckles.
r. Install the floor tunnel plate and secure with screws. Fasten the tunnel
carpet in place.
s. Install the rudder trim cover and control knob.
t. Install the access to the aft section of the fuselage.
5-33.

RUDDER CONTROLS.

5-34. REMOVAL OF RUDDER CONTROL CABLES. (Refer to Figure 5-13.)
a. To remove either the forward (10 or 11) or aft (14 or 15) rudder cables,
first remove the access panel to the aft section of the fuselage.
b. Disconnect the desired cable at the turnbuckle (12 or 13) in the aft section
of the fuselage.
c. Either forward rudder cable may be removed by the following procedure:
1. Remove the rear seat or floor panel, whichever applies, and the front
seats.
2. Remove the cable guard pin(7) from the underside of the pulley cluster
(9) that is located in the aft area of the flap torque tube.
3. From within the area aft of the main spar, remove the cable rub blocks
(6) that are attached to the spar housing by removing the block attaching screws.
4. Remove the rudder trim knob and the cover attaching screws.
5. Remove the tunnel plate just aft of the tee bar by removing enough carpet from the tunnel to allow the plate attaching screws and the plate to be removed.
6. Move the cable guard pin (4) located under the pulley cluster (5) just aft
of the tee bar by removing the cotter pin from the exposed end and sliding it to
the left or right, as required.
7. Disconnect the end of the cable from the arm on the rudder pedal torque
tube by removing the cotter pin, nut, washer and bolt (2).
8. Draw the cable from the floor tunnel.

Reissued:1/15/81

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PIPER CHEROKEE SERVICE MANUAL

d.

The aft rudder control cables may be removed by the following procedure:
1. Remove the tail cone fairing by removing its attaching screws.
2. Disconnect the cable (14 or 15) from the rudder horn (17) by removing
cotter pin, nut, washer and bolt (16).
6.
3. Draw the cable through the fuselage.

5-35. INSTALLATION OF RUDDER CONTROL CABLES. (Refer to Figure 5-13.)
a. The forward rudder control cables may be installed by the following procedure:
1. Draw the control cable through the floor tunnel.
2. Connect the end of the cable to the arm on the rudder pedal torque tube
by installing bolt, washer, nut and cotter pin (2). Allow the cable end free to
rotate on the arm.
3. Connect the cable to the aft control cable at the turnbuckle (12 or 13) in
the aft section of the fuselage. If the aft control cables are not installed, install
at this time per step b. Ascertain that each cable is in the groove of its pulley.
4. Move the cable guard (4) into position, that is located in the forward
area of the tunnel, under the pulley cluster (5) and secure with cotter pin.
5. Within the area aft of the main spar, install the cable guard blocks (6)
onto the spar housing and secure with screws.
6. Install the cable guard (7) under the pulley cluster (9) located just aft
of the flap torque tube.
7. Set cable tension and check rigging and adjustment per paragraph 5-36.
8. Install the forward tunnel plate aft of the tee bar and secure with screws.
9. Put the floor carpet in place and secure.
10. (PA-28-235.) Place the fuel selector lever on the selector torque tube
and secure with pin and cotter pin.
11. Install the lower and upper selector covers and secure with screws.
12. Install the rear seat or floor panel and install the seats.
b. The aft rudder control cables may be installed by the following procedure:
1. Position the control cable in the fuselage.
2. Connect the end of the cable (14 or 15) to the rudder horn (17) with bolt,
washer, nut and cotter pin (16). Allow the cable end free to rotate.
3. Connect the other cable end to forward control cable (10 or 11) at the
turnbuckle (12 or 13) in the aft section of the fuselage.
4. Set cable tension and check rigging and adjustmentper paragraph 5-36.
5. Install tail cone fairing and secure with screws.
c. Install the access panel to the aft section of the fuselage.

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PIPER CHEROKEE SERVICE MANUAL

1690

11

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.

RUDDER & STEERING PEDAL ASSY.
BOLT, WASHER, NUT & COTTER PIN
BOLT, BUSHINGS, WASHER & NUT
GUARD PIN, CABLE
PULLEY CLUSTER
RUB BLOCKS
GUARD PIN, CABLE
BOLT, BUSHINGS, WASHER & NUT
PULLEY CLUSTER
CABLE, RIGHT FORWARD
CABLE, LEFT FORWARD
TURNBUCKLE, LEFT
TURNBUCKLE, RIGHT
CABLE, RIGHT AFT
CABLE, LEFT AFT
BOLT, BUSHING, WASHER & NUT
HORN RUDDER

Figure 5-13.

Reissued: 1/15/81

Rudder Controls

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PIPER CHEROKEE SERVICE MANUAL

Refer to Figure 5-25 for tool fabrication

Figure 5-14.

Rudder Rigging Tool

Figure 5-15.

Clamping Rudder Pedals

5-36. RIGGING AND ADJUSTMENT OF RUDDER CONTROLS.
a. To check and set the correct degree of rudder travel, the following procedure may be used:
1. Check the rudder travel by swinging the rudder until it contacts its stop.
If the control cables are connected, use the rudder pedals to swing the rudder.
2. With the rudder against its stop, place a rigging tool against the side of
the rudder and vertical stabilizer as shown in Figure 5-14. (Ascertain that the
tool is not contacting any rivets.) If no gap exists between the rigging tool and
the surface of the rudder and vertical stabilizer,
the rudder stop for one direction of travel is correct as required in Table V-I. (This tool may be fabricated
from dimensions given in Figure 5-23.)
3. Swing the rudder in the other direction and check travel as directed in
step 2.
4. Should the rudder travel be incorrect showing a gap between the tool
and any part of the control surfaces, the tail cone fairing should be removed and
the stops reset to obtain correct rudder travel. (Refer to Figure 5-16.)
b. To set cable tension and alignment of the rudder, the following procedure
may be used:
1. Remove the access panel to the aft section of the fuselage.
2. Ascertain that thenose gearsteeringhasbeen
alignedand rudderpedals
set fore and aft according to Alignment of Nose Landing Gear, Section VII or VIIA.
3. Clamp the rudder pedals to align in a lateral position as shown in Figure 5-15.
4. Adjust the turnbuckles in the aft section of the fuselage to obtain proper
cable tension as given in Table V-I and to allow the rudder to align at neutral

Revised: 103 83

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PIPER CHEROKEE SERVICE MANUAL

1.
2.

Figure 5-16.

RUDDER TRAVEL ADJUSTMENT
STABILATOR TRAVEL ADJUSTMENT

Rudder and Stabilator Travel Adjustments

position. Adjust cables evenly to prevent undue strain on aircraft components. Neutral
position can be determined by standing behind the airplane and sighting the rudder with the
vertical stabilizer or the center of the trim screw.
5. Check safety of turnbuckles.
c. On fixed landing gears check that when the rudder contacts its stop, the clearance
between the nose wheelstops and the nose wheelhorn is between..06and . 12of an inch. A more
accurate check can be made with the weight off the nose wheel. Adjust the stops according to
Alignment of Nose Landing Gear. Section VII.
d. On 1974 models adjust the rudder pedal stops by pushing on the pilot's left rudder
pedal until the rudder stop is contacted. Adjust the pedal stop (on the fire wall)to provide 0.060
to 0. 120of an inch clearance. Repeat the procedure with the copilot's right rudder pedal. Do
not push rudder harder than necessary to avoid cable stretch.
e. Install the tail cone fairing and the access panel to the aft section of the fuselage.

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PIPER CHEROKEE SERVICE MANUAL

5-37. RUDDER TRIM CONTROLS.

5-38. REMOVALOF RUDDERTRIM CONTROLS. (Refer to Figure 5-17.)
a. Remove the cover (1) from over the trim control assemblyby removingattaching
screws.
b. Remove the rudder trim knob (2) and the coverattaching screws.
c. Rotate the trim knob to the extreme left (counterclockwise)trim position.
d. Disconnect the housing lug from the arm on the rudder pedal torque tube by
removingcotter pin, nut, washer and bolt (7).
e. Remove the threaded bushing (4) from the aft end of the mounting channel (8) by
removing cotter pin and clevis pin (5). Some mounting channelshave two holes in the aft
end, note from which hole in the clevispin wasremoved.
f. The mounting channel may be removedby removingthe channelattaching screwsat
the inside of the channel.

5-39. INSTALLATIONOF RUDDERTRIM CONTROLS.(Refer to Figure 5-17.)
Install the rudder trim mechanism and set it at the neutral (no load on spring)position.
Perform the procedure only after all other rudder and nose wheelriggingis complete.
a. Install the trim control mounting channel (8) on the upper side of the floor tunnel.
A spacer plate (14) on some models is installedbetween the channeland the tunnel. Install
the attaching screws (9) which are securedwith anchor nuts.
b. Before attaching the assemblyto the mounting channel, ascertainthat the clips(1 1)
are installed so the safety wire (12) will be on top. Also, that the threaded bushing (4) is
installed on the assembly shaft (15) with the weldedattachment bushingforward or toward
the housing.
c. Attach the housing lug to the arm provided on the rudder pedal torque tube and
secure with bolt, washer and nut (7). Tighten the nut only finger tight and safety with
cotter pin.
d. Clamp the rudder pedals in neutral and position the threaded bushing in the
mounting channel (8). Turn the control shaft until the holes in the bushing and channel
align and then install the clevis pin and cotter pin (5). Should two thru holes be located in
the aft end of the mounting channel, the pin must be installed through the hole that will
give equal travel and hit rudder stops before bottoming out of the trim assembly.
e. With the rudder pedals neutral and no pressure fore or aft on the clevispin, install
the assembly cover (1) so that the indicator washer (13) and the neutral mark on the cover
align.
f. Install the trim cover, securewith screws,and install the trim control knob.

Reissued: 1/15/81

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PIPER CHEROKEE SERVICE MANUAL

1660
.25 must be held when trim assembly
Installed

with

rudder

pedals

In neutral

position.

1.
2.
3.
.
5.
6.
8.
9.
9.
10.
11.
12.
13.
14.
15.

Figure 5-17.

COVER
RUDDER TRIM XNOS
LOCK SCREW
BUSHING
CLEVIS PIN
HOUSING, CONTROL SHAFT
BOLT ASSEMBLY
CHANNEL, MOUNTING
SCREW
SCREW
CLIPS
SAFETY WIRE
WASHER, INOICATOR
SPACER PLATE
SHAFT, CONTROL

Rudder Trim Control

5-40. RIGGING AND ADJUSTMENTOF RUDDER TRIM CONTROLS.Perform these
procedures only after all other rudder and nose wheelriggingis complete. No adjustments
are necessary other than those required during installation of the assemblyin the airplane as
givenin paragraph 5-39.
5-41. WING FLAP CONTROLS.

5-42. REMOVALOF WINGFLAP CONTROLS.(Refer to Figure 5-18.)
a. The flap torque tube assemblymay be removedby the followingprocedure:
1. Remove the accessplate located between the undersideof the aft section of each
wing and the fuselageby removing attachingscrews.
2. Remove the two front seats and the bottom half of the rear seat or floor panel,
whichever applies.
3. Disconnect the left and right flap control tubes (rods) (4) at the flaps by
removing the nuts, washers and bolts (2) or at the torque tube cranks (arms) (11) by

Reissued:
ed: 1/15/81

SURFACE CONTR(

PIPER CHEROKEE SERVICE MANUAL

removing the bolts (12) and washersfrom the inner side of each crank. It will be necessay
to remove bolt through a hole in the side skin of the fuselagelocated over the torque tube
with the flap handlemovedto its 40 degreeposition.
4. With the flap handle (29), fully extend the flaps and disconnect the flap tension
spring (22) at the spar or the aft end of the control cable (23), as desired.
5. Grasp the flap handle, release the plunger(33) and allow the flap to return to
the retracted position. Use caution as forward pressure will be on the handle with the
tension spring disconnected.
6. Disconnect the flap return spring (32) at the spar or return chain (30), as
desired.
7. Disconnect the control cable from the chain (20) by removingcotter pin, nut
and clevisbolt (21).
8. Remove the tube support blocks (16 and 31) by removingthe block attaching
bolts (15).
9. Removethe nuts, washersand bolts (10) securingthe right and left cranks ( 1)
and stop fittings(13) on the torque tube.
10. From between each wing and the fuselage, remove the cranks from the torque
tube.
11. Disconnect one bearing block (7) from its mounting brackets (6) by removing
nuts, washersand bolts (5).
12. Slide the tube from the bearing block still attached to its brackets; raise the end
and lift it from the floor opening.
b. The flap control cable(23) may be removedby the followingprocedure:
1. If the front seats and bottom of the rear seat havenot been removed, remove the
seats.
2. Disconnect the flap tension spring (22) from the cable, if not previously
disconnected,by extendingthe flapsto relievespringtension.
3. Retract the flap. Use caution as forward pressurewillbe on the handle with the
spring disconnected.
4. Disconnect the cable from the chain (20) by removingcotter pin, nut, clevispin
and bushing(21).
5. Removethe flap handlebracket and cover.
6. Lift the aft section of the tunnel carpet far enough to remove the screws
securing the tunnel cover that is between the flap handle and the spar cover. Remove the
cover.
7. Removethe cotter pin cable guard from the flap cablepulley (24) located inside
the floor tunnel just ahead of the spar housing.
8. Removethe cable rub blocks located in the floor openingon the aft side of the
spar housing by removingthe attachingscrews.
9. Disconnectthe cable turnbuckle (25) at the flap handleby removingcotter pin,
nut and bolt (26). Checkclevisbolt (26) for wear. Replacebolt if any wear is evident.

Reissued: 1/15/81

2C9

SURFACE CONTROLS

`
PIPER CHEROKEE SERVICE MANUAL

1707

19-

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.

BRACKET, ROD ATTACHENT
12. BOLT, WASHER & BUSHING
13. FITTING, TORQUE TUBE STOP
BOLT, WASHER S NUT
JAM NUT
14. TUBE, TORQUE
ROD, FLAP CONTROL
15.
BOLT, WASHER & NUT
16. BLOCK, BEARING
BOLT, BEARING BLOCK ATTACHMENT
17. SPROCKET, TENSION SPRING
BRACKET, BEARING BLOCK
BLOCK, BEARING
18. BOLT, WASHER & NUT
19. BRACKET, BEARING BLOCK
NUT, LOCK
20. CHAIN, TENSION SPRING
SCREW, FLAP ADJUSTMENT
21. CLEVIS BOLT, BUSHING NUT & COTTER PIN
BOLT, WASHER & NUT
CRANK (ARM), TORQUE TUBE
22. SPRING, TENSION

Figure 5-18.

Reissued: 1/15/81

23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.

CABLE, FLAP CONTROL
PULLEY
TURNBUCKLE
CLEVIS BOLT, NUT & COTTER PIN
BOLT, BUSHING, WASHER & NUT
BRACKET, FLAP HANDLE
HANDLE, FLAP
CHAIN, RETURN SPRING
BLOCK, BEARING
SPRING, RETURN
BUTTON, FLAP RELEASE

Flap Controls

2C10

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PIPER CHEROKEE SERVICE MANUAL

c. Remove the flap handle (29)and bracket (28)by disconnecting the cable turnbuckle from the handle and removing the bolts securing the bracket to thefloor
tunnel.

5-43. INSTALLATION OF WING FLAP CONTROLS. (Refer to Figure 5-18.)
a. The flap torque tube assembly may be installed by the following procedure:
1. Install the chain sprocket (17) with chain (20 and 30) on the torque tube
(14) and secure with bolts, washers and nuts (18).
2. Slide the tube stop fittings (13) on their respective ends of the torque
tube.
3. Ascertain that one bearing block fitting (7) is installed between its attachment brackets (6).
4. Slide the other bearing block over its respective end of the torque tube.
5. Position the torque tube by placing the end with the bearing block on it
between the mounting bracket and sliding the other end into the previously attached bearing block.
6. Position the remaining bearing block and secure with bolts, washers
and nuts (5).
7. Push the torque tube cranks (arms) (11) on each end of the torque tube
and slide the stop fitting (13) in place. Align the bolt hole of the crank and stop
fitting with the holes in the torque tube and install bolts. The holes in the stop
fitting are longated to allow the stop fitting to be pushed against the bearing blocks
(7) thus allowing no side play of the assembly. Tighten the bolt assemblies (10)
on the stop fittings.
8. Install the tube support blocks (16 and 31) on their support brackets (19)
and secure with bolts (15).
9. Connect. the flap return spring (32) to the return chain (30) and/or at
the spar housing.
10. Connect the control cable end to the tension chain (20) and secure with
bushing, clevis bolt, nut and cotter pin.
11. Pull the flap handle full back and connect the tension spring (22). Release the flap handle to the forward position.
12. Connect the flap control tube (4) to the flap and/or torque tube crank (11)
and secure. The bolt (12) and bushing that connects the control tube to the crank
is installed through a hole in the side of the fuselage located over the torque tube.
b. To install the flap handle (29) with bracket (28), place the assembly on the
floor tunnel and secure with bolts.
c. The flap control cable (23) may be installed by the following procedure:
1. Attach the cable and turnbuckle (25) to the flap handle arm and secure
with clevis bolt, nut and cotter pin (26). Ascertain that the turnbuckle endis free
to rotate on the arm.

Reissued: 1/15/81

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PIPER CHEROKEE SERVICEMANUAL

Figure 5-19. Flap Step Adjustment
2. Route the cable through the tunnel and spar housing.
3. Install the cable rub blocks on the aft side of the spar housing and
secure with screws.
4. Install cotter pin cable guard over pulley (24) located just ahead of the
spar housing in the floor tunnel.
5. Attach the cable end to the tension chain(20) and secure with bushings,
clevis bolt, nut and cotter pin. If the chain is not installed because of the torque
tube assembly being removed, install the assembly as given in step c.
6. Pull the flap handle (29) full back and connect the tension spring (22) to
the cable end.
d. Install the tunnel cover and secure with screws. Also, the tunnel carpet
and bracket cover.
e. Install and secure the seats.

5-44. RIGGING AND ADJUSTMENT OF WING FLAPS.
a. Place the flap handle in the full forward position.
b. If not previously removed, remove the bottom half of the rear seat.
c. To adjust the flap up stop and step lock, loosen the jam nut of the right
torque tube stop screw, located in the floor opening along the outer end of the
flap torque tube, and turn the stop screw to obtain approximately .60 of an inch
between the stop fitting and the bearing block as measured along the top side of
the screw. (Refer to Figure 5-19.) It may be necessary to loosen the adjustment screw of the left stop.

Revised: 4 23 84

2C12

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PIPER CHEROKEE SERVICE MANUAL

d. Place a .125 spacer between the stop fitting and the end of the screw. Determine that when pressure is applied down on the flap, it will remain in the uplock position. If it extends, turnthe adjustment screw out a few threads at a time
until the flap remains in the up-lock position with the spacer inserted. Tighten
the jam nut.
e. Rotate the left stop adjustment screw until it contacts the stop fitting.
Tighten the jam nut.
f. Set the flap control cable tension (handle next to floor, 0 degrees) as given
in Table V-I at the turnbuckle that is attached to the lower end of the flap handle
in the floor tunnel. To do this and if not previously removed, remove the flap
handle cover and enough tunnel carpet to remove the tunnel cover just aft of the
handle. Adjust and resafety the turnbuckle.
NOTE
Do not rotate the torque tube while."retensioning the
cable or tighten tight enough to allow tube to be pulled
away from its stops.
g. To check up-neutral position of the flaps, place a flap rigging tool as shown
in Figure 5-20 against the underside of the wing and flap as close as possible to
The tool must be pothe outboard end of the flap without contacting any rivets.
sitioned parallel with the wing ribs with the aft end of the tool even with the trailing edge of the flap. (This tool may be fabricated from dimensions given in Figure 5-22.)
h. With the flap control rod connected between the torque tube crank arm and
the flap, check that the surface of the wing contacts the tool at its forward surface and at the spacer, and the aft end of the flap contacts the aft end of the tool.
The flap is neutral at this position.
i. Should the three points not contact, loosen the jam nuts on each end of the
control rod and rotate the rod until the three points contact. Apply a slight up
pressure against the trailing edge of the flap while making this adjustment. After
adjustment, retighten the jam nuts.
j . Check and adjust the other flap in a like manner.

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PIPER CHEROKEE SERVICE MANUAL

NOTE
In the event of wing heaviness during flight, the flap
on the side of the heavy wing can be adjusted down
from neutral to remedy this condition by lengthening
the control rod. Check the inspection hole in each rod
end to ascertain that there are sufficient threads remaining and a wire cannot be inserted through these
holes. Rod ends without check holes, maintain a minimum of .375 of an inch thread engagement.
Do not
raise the flap of the other wing above neutral.
k. Check the flap for full down travel to the degrees required in Table V-I.
Should the travel not be as that required, readjust the torque tube stop screw in
or out as required.
After readjusting the screw, it will be necessary to reviewsteps d thru j.
1. Check operation of the flap and flap handle ratchet mechanism.
m. Install access plates and panels.

1.

857

375 HEIGHT SPACER IS TO BE IN LINE WITH AFT SPAR
RIVET LINE. BUT SHOULD NOT MAKE CONTACTWITH ANY
RIVETS.
UP NEUTRAL (0) OF FLAPS WILL OCCUR WHEN THESE
POINTS MAKE CONTACT WITH WING AND FLAP SKIN.

.
TOOL:

Refer to Figure 5-23 for tool fabrication

Figure 5-20. Flap Rigging Tool

Revised: 4 23 84

2C14

SURFACE CONTROLS

PIPER CHEROKEESERVICEMANUAL

A114

MATERIAL:
.125 X 3.53 X 1.0 ALUM. PLATE
OR
.125 X 3.85 X 1.0 ALUM. PLATE

3.531

.062R.

.625

.125

.062R.

2
2.781

Figure 5-21.- Fabricated AileronBellcrankRiggingTool

901
HERE

ONLY CORRECT METHOD
HERE

IMPROPERTOOL (RESULTING
IN LOCKEDBALL)

5-22. Correct Method of Installing Rod End Bearings
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2C15

SURFACE CONTROLS

PIPERCHEROKEE SERVICE MANUAL

A115

SEE NOTE1

13.250

.375

I

.187

4.0

31.50

SEE NOTE 2

1.
2.

NOTES
DRILLAND TAP TO 10-32NF. AN-3 BOLT,JAM NUTAND
INTERNALSTAR WASHER. MAY BE USED FORSPACER
OR AN-3 BOLTWITH HEADFILEDTOREQUIREDLENGTH.
SPAR STOCK MAY BE USED IN PLACEOF ALUM.BAR
STOCK.

.375
.750

MATERIAL:
: .750 X 31.50 X 4.00 ALUM. BAR OR
.750 X 31.5 X .750 ALUM. BAR (MIN.)

Figure 5-23. Fabricated Aileron and Flap Rigging Tool

Revised: 4'23 84

2C16

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PIPER CHEROKEE SERVICE MANUAL

932

MATERIAL:
1.0 X 23.19 X 3.82 ALUM. BAR
SE LINE
SURFACE PARALLEL TO BASE
STABILATOR CONTOUR
1.10
.803,

1.121

1.39,

1.60

. /

25 SET BACK

BASE LINE

22

.94
1.53

20.00

1.00
24.03

18.03

15.03

EDGE

Figure 5-24. Fabricated Stabilator Rigging Tool

Reissued: 1/15/81

2C17

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PIPER CHEROKEE SERVICE MANUAL

C341

.281

8

I

5.2

20
MATERIAL:
STEELOR HARDALUMINUM
.125 X 20.0 X 6.187 PLATE

Figure 5-25. Fabricated Rudder Rigging Tool

Reissued:1/15/81

2C18

SURFACE CONTROLS

PIPER CHEROKEE SERVICE MANUAL

TABLEV-III. TROUBLESHOOTINGCHART(SURFACECONTROLS)
Trouble

Cause

Remedy

AILERONCONTROLSYSTEM
Lost motion between control wheel and aileron.

Resistance to control
wheel rotation.

Reissued: 1/15/81

Cable tension too low.

Adjust cable tension.
(Refer to paragraph
5-12.)

Linkage loose or worn.

Check linkage and
tighten or replace.

Broken pulley.

Replace pulley.

Cables'not in place on
pulleys.

Install cables correctly. Check cable
guards.

System not lubricated
properly.

Lubricate system.

Cable tension too high.

Adjust cable tension.
(Refer to paragraph
5-12.)

Control column horizontal chain improperly
adjusted.

Adjust chain tension.
(Refer to paragraph
5-6.)

Pulleys binding or
rubbing.

Replace binding pulleys
and/or provide clearance
between pulleys and
brackets.

Cablesnot in place on
pulleys.

Install cables correctly. Check cable
guards.

Bent aileron and/or
hinge.

Repair or replace aileron and/or hinge.

Cables crossed or
routed incorrectly.

Check routing of control
cables.

2C19

SURFACE CONTROLS

PIPER CHEROKEE SERVICE MANUAL
TABLE V-III. TROUBLESHOOTINGCHART (SURFACECONTROLS)(cont.)
Trouble

Cause

Remedy

AILERONCONTROLSYSTEM(cont.)
Control wheels not
synchronized.

Incorrect control
column rigging.

Rig in accordance with
paragraph 5-6.

Control wheelsnot horizontal when ailerons
are neutral.

Incorrect riggingof
aileron system.

Rig in accordance with
paragraph 5-12.

Incorrect aileron
travel.

Aileron control rods
not adjusted properly.

Adjust in accordance
with paragraph 5-12.

Aileron bellcrank stops
not adjusted properly.

Adjust in accordance
with paragraph 5-12.

Correct aileron travel
cannot be obtained by
adjusting bellcrank
stops.

Incorrect riggingof
aileron cables, control
wheeland control rod.

Rig in accordance with
paragraph 5-12.

Control wheel stops
before control
surfaces reach full
travel.

Incorrect rigging
between control wheel
and control cables.

Rig in accordance with
paragraph 5-12.

Reissued: 1/15/811

2C20

STRUCTURES

PIPER CHEROKEE SERVICE MANUAL

TABLEV-III. TROUBLESHOOTINGCHART (SURFACECONTROLS) (cont.)
Trouble

Remedy

Cause
STABILATORCONTROL SYSTEM

Lostmotion between
Lost
ntrol wheel and stabilator.

ReResistance
to stabilator

ntrol movement.

Incorrect stabilator
travel.

Reissued: 1/15/81

Cable tension too low.

Adjust cable tension
per paragraph 5-17.

Linkage loose or worn.

Check linkage and
tighten or replace.

Broken pulley.

Replace pulley.

Cablesnot in place
on pulleys.

Install cables correctly.

System not lubricated
properly.

Lubricate system.

Cable tension too high.

Adjust cable tension
per paragraph 5-17.

Bindingcontrol column.

Adjust and lubricate
per paragraph 5-6.

Pulleys binding or
rubbing.

Replace binding pulley
and/or provide clearane
between pulleys and
brackets.

Cablesnot in place on
pulleys.

Install cables correctly.

Cables crossed or routed incorrectly.

Check routing of control
cables.

Bent stabilator hinge.

Repair or replace
stabilator hinge.

Stabilator stops
incorrectly adjusted.

Adjust stop screws per
paragraph 5-17.

2C21

SURFACECONTROLS

PIPER CHEROKEE SERVICE MANUAL
TABLE V-III. TROUBLESHOOTINGCHART (SURFACE CONTROLS)(cont.)
...

Trouble

Cause

Remedy

STABILATORCONTROL SYSTEM-(cont.)
Correct stabilator
travel cannot be
obtained by adjusting
stops.

Stabilator cables
incorrectly rigged.

Rig cablesin accordance
with paragraph 5-17.

STABILATORTRIM CONTROL SYSTEM
(FLOOR TRIM
Lost motion between trim control wheel
and trim tab.

Trim control wheel
moves with excessive
resistance.

Reissued: 1/15/81

Cable tension too low.

Adjustin accordance
with paragraph 5-29.

Cables not in place on
pulleys.

Install cables according to paragraphs 5-26
and 5-28.

Broken pulley.

Replace pulley.

Linkage loose or worn.

Check linkage and
tighten or replace.

System not lubricated
properly.

Lubricate system.

Cable tension too high.

Adjust in accordance
with paragraph 5-29.

Pulleys binding or
rubbing.

Replace binding pulleys.
Provide clearance between
pulleys and brackets.

Cables not in place on
pulleys.

Refer to paragraphs
5-26 and 5-28.

Trim tab hinge binding.

Lubricate hinge. If
necessary,replace.

Cables crossed or
routed incorrectly.

Check routing of control
cables.

2C22

SURFACE CONTROLS

PIPER CHEROKEE SERVICE MANUAL

TABLE V-III. TROUBLESHOOTINGCHART(SURFACECONTROLS)(cont.)
Remedy

Cause

Trouble

STABILATORTRIM CONTROLSYSTEM(cont.)
FLOOR TRIM (cont.)
Trim tab fails to
reach full travel.

Trim indicator fails
to indicate correct
trim position.

System incorrectly
rigged.

Check and/or adjust
riggingper paragraph
5-29.

Trim drum incorrectly wrapped.

Check and/or adjust
riggingper paragraph
5-29.

Trim indicator unit
not adjusted properly.

Adjust in accordance
with paragraph 5-29.

OVERHEADTRIM
Lost motion between
trim control crank
and trim tab.

Trim control crank
moves with excessive
resistance.

Reissued: 1/15/81

Cable tension too low.

Adjust in accordance
with paragraph 5-23.

Cablesnot in place on
pulleys.

Install cables according to paragraphs5-20
and 5-22.

Broken pulley.

Replace pulley.

Linkage loose or worn.

Check linkage and
tighten or replace.

System not lubricated
properly.

Lubricate system.

Cable tension too high.

Adjust in accordance
with paragraph 5-23.

2C23

SURFACE CONTROLS

PIPER CHEROKEE SERVICE MANUAL

TABLE V-III. TROUBLESHOOTINGCHART (SURFACE CONTROLS)(cont.)
Trouble

Remedy

Cause

STABILATORTRIM CONTROLSYSTEM(cont.)
OVERHEADTRIM (cont)
Trim control crank
moves with excessive
resistance. (cont.)

.

Trim tab fails to
reach full travel.

Trim indicator fails
to indicate correct
trim position.

Reissued:1/15/81

Pulleys binding or
rubbing.

Replace binding pulleys.
Provide clearance between
pulleys and brackets.

Cablesnot in place on
pulleys.

Refer to paragraphs
5-20 and 5-22.

Trim tab hinge binding.

Lubricate hinge. If
necessary, replace.

Cablescrossed or
routed incorrectly.

Check routing of control
cables.

System incorrectly
rigged.

Check and/or adjust
riggingper paragraph
5-23.

Trim drum incorrectly wrapped.

Check and/or adjust
riggingper paragraph
5-23.

Trim indicator unit
not adjusted properly.

Adjust in accordance
with paragraph 5-23.

2C24

SURFACE CONTROLS

PIPER CHEROKEE SERVICE MANUAL

TABLEV-III. TROUBLESHOOTINGCHART (SURFACE CONTROLS)(cont.)
Trouble

Cause

Remedy

RUDDER CONTROL SYSTEM
Lost motion between
rudder pedals and
rudder.

Excessiveresistance
to rudder pedal
movement.

Rudder pedals not
neutral when rudder
is streamlined.

Reissued: 1/15/81

Cable tension too low.

Adjust cable tension
per paragraph 5-36.

Linkage loose or worn.

Check linkage and
tighten or replace.

Broken pulley.

Replace pulley.

Bolts attaching rudder
to bellcrank are loose.

Tighten bellcrank bolts.

System not lubricated
properly.

Lubricate system.

Rudder pedal torque
tube bearing in need
of lubrication.

Lubricate torque tube
bearings.

Cable tension too high.

Adjust cable tension
per paragraph 5-36.

Pulleys binding or
rubbing.

Replace binding pulleys
and/or provide clearance
between pulleys and
brackets.

Cablesnot in place on
pulleys.

Install cables correctly. Check cable
guards.

Cables crossed or
routed incorrectly.

Check routing of control
cables.

Rudder cables
incorrectly rigged.

Rig in accordance with
paragraph 5-36.

2D1

SURFACE CONTROLS

PIPER CHEROKEE SERVICE MANUAL

TABLE V-III. TROUBLESHOOTINGCHART (SURFACE CONTROLS)(cont.)
Trouble

Cause

Remedy

RUDDER CONTROL SYSTEM(cont.)
Incorrect rudder
travel.

Rudder bellcrank stop
incorrectly adjusted.

Rig in accordance with
paragraph 5-36.

Nose wheel contacts
stops before rudder.

Rig in accordance with
paragraph 3-36.

RUDDER TRIM CONTROL SYSTEM
Trim control knob
moves with excessive
resistance.

System not lubricated
properly.

Lubricate system.

FLAP CONTROL SYSTEM
Flaps fail to extend
or retract.

Control cable broken
or disconnected.

Replace or reconnect
control cable. (Refer
to paragraph 5-43.)

Flaps not synchronized or fail to
move evenly when
retracted.

Incorrect rigging

Adjust flaps per instructions in paragraph
5-44.

Reissued: 1/15/81

of system.

2D2

SURFACE CONTROLS

SECTION
VI
HYDRAULIC
SYSTEM
(PA-28R)

Aerofiche
Grid No.

6-1.
6-2.
6-3.
6-4.

6-12.

6-17.

6-23.

6-29.

Introduction ................................
Description .................................
Troubleshooting .............................
Hydraulic Pump .............................
6-5.
Removal of Hydraulic Pump ..............
6-6.
Disassemblyof Hydraulic Pump ............
6-7.
Cleaning, Inspection and Repairsof
Hydraulic Pump..................
6-8.
Assembly of Hydraulic Pump ... ..........
6-9.
Test and Adjustment of Hydraulic Pump .......
6-10.
Installation of Hydraulic Pump ............
6-11.
Filling Hydraulic Pump Reservoir ...........
Gear Back-Up Extender Actuator Assembly ..............
6-13.
Removal of Gear Back-UpExtender Actuator
Assembly ......................
6-14.
Installation of Gear Back-UpExtender
Actuator Assembly ................
6-15.
Check and Adjustment of Gear Back-Up
Extender Actuator.................
Operational Check of Retractable
6-16.
Landing Gear System
................
.
. ..................
Nose Gear Actuating Cylinder .
Removal of Nose Gear Actuating Cylinder ......
6-18.
Disassemblyof Nose Gear Actuating Cylinder ....
6-19.
6-20.
Cleaning,Inspection, and Repair of Nose
. ..........
Gear Actuating Cylinder ...
Assembly of Nose Gear Actuating Cylinder .....
6-21.
Installation of Nose Gear Actuating Cylinder ...
6-22.
Main Gear Actuating Cylinder .....................
6-24.
Removal of Main Gear Actuating Cylinder ......
Disassemblyof MainGear Actuating Cylinder ....
6-25.
6-26.
Cleaning,Inspection, and Repair of Main
Gear Actuating Cylinder ............
Assemblyof Main Gear Actuating Cylinder .....
6-27.
6-28.
Installation of Main Gear Actuating Cylinder ....
Hydraulic Lines ..............................
Removal and Installation of Hydraulic Lines .....
6-30.

Reissued: 1/15/81

2D3

2D4
2D4
2D8
2D9
2D9
2D9
2D11
2D11
2D12
2D16
2D16
2D16
2D16
2D17
2D18
2E3
2E3
2E3
2E3
2E4
2E6
2E6
2E6
2E6
2E7
2E7
2E7
2E7
2E7

PIPER CHEROKEE SERVICE MANUAL

SECTION VI
HYDRAULIC SYSTEM
PA-28R
6-1. INTRODUCTION.. The PA-28R hydraulic system components covered
in this section consist of the combination hydraulic pump and reservoir, gear
back-up extender actuator assembly, actuating cylinders and hydraulic lines.
The brake system, although hydraulically operated, is not included inthis section
as it has its own hydraulic system independent of the gear retraction system.
The brake system along with the landing gearand components is covered in Section VIIA.

This section provides -instructions for remedying difficulties which may
arise in the operation of the hydraulic system. The instructions are organized
so that the mechanic can refer to: Description of the System, for a basic understanding of the system; Troubleshooting, for a methodical approach in locating
difficulty; Corrective Maintenance, for the removal, repair and installation of
components; and Adjustments and Checks, for the operation of the repaired system.
CAUTION
Prior to starting anyinvestigation of the hydraulic sys tem, place the airplane on jacks. (Refer to Jacking,
Section II.)

6-2. DESCRIPTION. Hydraulic fluid is supplied to the landing gear actuating cylinders by
an electrically powered, reversible hydraulic pump located aft of the baggagecompartment
at right side of station 156.00. A reservoiris also an integral part of the pump. The pump is
controlled by a selector handle on the instrument panel to the left of the control quadrant.
As the handle is selected to either the up or down position, the pump directs fluid through a
single line to a manifold and from that manifold to each individual actuating cylinder. As
fluid pressure increases at one side of a cylinder piston, fluid at the other side is directed
back through another manifold to the pump. The two manifolds and their connecting lines
serve either as pressure or return passagesdepending on the rotation of pump to retract or
extend the gear.
On the manifold through which pressure fluid passed during gear retraction

Reissued: 1/15/81

2D4

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

HYDRAULICPUMPRESERVOIR
FILTER

RELIEF
THEWRMAL
PRESSURE
LOW

SHUTTLE
SWITCH

SNUBBER
GEARDOWN
ORIFICE
FALL
FREE
MANUAL
EXTEND
EMERGENCY
CYLINDER

&
DOWN
GEAR
AUTORMATIC
FALL
FREE
EMERGENCY
VALVE.
GEAR

CYLINDER
HYDAULIC

SIDE
ONFUSELAGE

CHAMBER
SENSING

I

Figure 6-1.

Reissued: 1/15/81

Schematic Diagram of Hydraulic System

2D5

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

1817

1.
2.
3.
4.
.
6.
7.
8.
9.
10.
11.

Figure 6-2.

Reissued: 1/15/81

PUMP/RESERVOIR
ACTUATING CYLINDER, RIGHT
MANIFOLD, GEAR DOWN
MANIFOLD, GEARUP
PRESSURE SWITCH
GEAR BACK-UP EXTENDER ACTUATOR
MAST, ACK-UP EXTENDER
ACTUATING CYLINDER, LEFT
LEVER, EMERGENCY EXTENDER
ACTUATING CYLINDER NOSE
FITTING, RESTRICTOR

Hydraulic System Installation

2D6

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

is a pressure switch. This switch opens the electrical circuit to the pump solenoid when the
gear fully retracts and pressure in the system increases to approximately 1400 psi The
switch will continue to hold the circuit open until pressure in the system drops to
approximately 1100 psi, when at that time the pump will again operate to build up pressure
as long as the gear selector handle is in up position. The down position of the handle does
not effect the pressure switch.
The hydraulic pump is a gear type unit driven by a 14-volt reversiblemotor designedto
operate at a maximum pressure of 1600 to 2000 psi. To prevent excessivepressure in the
hydraulic system due to fluid expansion, there is a thermal relief valve incorporated in the
pump that vill open at 4000 psi and allow fluid to flow to the pump reservoir. Other valves
in the pump system channel fluid to the proper outlets during gear retraction or extension.
In the base of the pump is a shuttle valve that allows fluid displaced by the cylinder piston
rods to return to the reservoir without back-pressure.
Also in the system is a by-pass or free-fall valve that allows the gear to drop should a
malfunction in the pump system occur. To prevent the gear from extending too fast, there is
a special restrictor fitting on the side of the valve. The valve is controlled manually or by a
gear back-up extension device that is operated by a pressure sensingdevice which lowers the
gear regardless of gear selector handle position, depending upon airspeed and engine power
(propeller slipstream). Gear extension occurs even if the selector is in the up position, at
airspeeds below approximately 105 MPH with engine power off. The device also prevents
the gear from retracting at airspeeds below approximately 85 MPHwith full power, though
the selector switch may be in the up position. This speed increases with reduced power
and/or increased altitude. The sensing device operation is controlled by a differential air
pressure across a flexible diaphragm which is mechanically linked to the hydraulic valveand
an electrical switch which actuates the pump motor.A high pressure and static air source for
actuating the diaphragm is provided in a mast mounted on the left side of the fuselageabove
the wing. Manual override of the device is provided by an emergency gear lever located
between the front seats to the left of the flap handle.
The emergency gear lever, used for emergency extension of the gear, manually releases
hydraulic pressure to permit the gear to free-fall with spring assistance on the nose gear. The
lever must be held in the downward position for emergency.extension. This same lever,
when held in the raised position, can be used to override the system, and gear position is
controlled by the selector switch regardlessof airspeed/power combinations. The lever must
also be held in the raised position when hydraulic system operational checks are being
conducted. An override lock is installed on 1972 models and is also availablein kit form for
earlier models. This lock allows the emergency extension lever to be locked in the up
override position. A warning light is mounted below the gear selector lever, and flashes to
indicate whenever the lock is in use. The lock is disengagedby pulling up on the extension
lever.
For a description of the landing gear and electrical switches, refer to Section VII,
Landing Gear and Brake System.

Reissued: 1/15/81

2D7

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

TABLE VI-I. LEADING PARTICULARS, HYDRAULIC SYSTEM
Hydraulic Pump
High Pressure
Low Pressure
Flow Rate @ 1000 psi
High Pressure Control
Thermal Relief
Hydraulic Fluid

1600 to 2000 psi
650 ± 150 psi
45 cu. in. per min.
1600 to 2000 psi
4000 psi
MIL-H-5606

Pressure Switch
Open (OFF) Pressure
Close (ON) Pressure

1100 ± 100 psi
400 ± 200 psi below opening pressure

6-3.

TROUBLESHOOTING

Malfunctions

6-3. TROUBLESHOOTING. Malfunctions of the hydraulic systemwill result in
failure of the landing gear to operate properly. When trouble arises, jack up the
airplane (Refer to Jacking, Section II.) and then proceed to determine the extent
of the trouble. Generally, hydraulic system troubles fall into two types, troubles
involving the hydraulic supplying system and troubles in the landing gear hydrau lic system. Table VI-III at the back of this section, lists the troubles which may
be encountered and their probable cause, and suggests a remedy for the trouble
involved. A hydraulic system. operational check may be conducted using Figures
6-1 or .6-2.
When the trouble has been recognized, the first step in troubleshooting is isolating the cause. Hydraulic system troubles are not always traceable to one cause. It is possible that a malfunction may be the result of more
than one difficulty within the system. Starting first with the most obvious and
most probable reasons for the trouble, check each possibility in turn and, by
process of elimination, isolate the troubles.
NOTE
If it is found that the hydraulic pump is at fault and requires disassembly, itis recommended that it be overhauled by a recommended overhaul shop. However, if
this cannot be achieved, minor repairs of the pump
such as replacement of gaskets and motor components,
and pressure checks with adjustments maybe accomplished in accordance with instructions given in paragraphs 6-6 thru 6-9.

Reissued:1/15/81

2D8

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

6-4. HYDRAULIC

PUMP.

6-5. REMOVAL OF HYDRAULIC PUMP. The hydraulic pump with reservoir incorporated is located in the aft section of the fuselage. Accessto the pump is through the access
panel in the aft wall of the baggage compartment.
a. Disconnect the pump electrical leads from the pump solenoid relays and the ground
wire from the battery shelf.
b. Disconnect the hydraulic lines from the pump. Cap the line ends to prevent contamination.
c. Remove the pump by removing the pump attaching bolts.
6-6. DISASSEMBLY OF HYDRAULIC PUMP. (RefertoFigure6-3.) Afterthehydraulic
pump has been removed from the airplane, cap or plug all ports and clean the exterior of the
pump with a dry type solvent to remove accumulated dust or dirt. To disassembleany one of
the three main components of the pump, proceed as follows:
a. The base (16) of the pump may be removed from the case (15) as follows:
1. Cut the safety wire and remove the bolts (17) with washers that secure the base
to the pump case.
2. The shuttle valve within the base should be removed for cleaning purposes only.
To remove the valve, cut safety wire. Remove plug with spring and valve.
NOTE
The shuttle valve and'pump base are matched, lapped parts.
Should it be necessaryto replace, replaceas an assembly only.
b. Pump Motor: The pump motor may be removed from the pump and disassembledas
follows:
1. Remove thru bolts (4) from head (1) of motor. Using a knife cut the seal coating
between the motor head and case.
2. Lift the head up from the case approximately .50 of an inch, this will allow inspection of brushes (3) without the.brushes unseating from the commutator. (Refer to Paragraph 6-7 for brush inspection.) The brush leads are secured to the head assembly.
3. Raise the head assembly (1) off the armature (8) and note the small thrust ball (7)
located between the end of the armature (8) and motor head. Do not misplace this bearing.
4. Draw the armature from the motor frame (9). Note the number of thrust washers
(11) mounted on the drive end of the armature shaft.
5. Remove the motor frame from the pump reservoir (13.)

Reissued:1/15/81

2D9

HYDRAULICSYSTEM

PIPER CHEROKEE SERVICE MANUAL

2024

6

2

7

9

10

11

13

14

15
1. HEAD, MOTOR
2. SPRING,BRUSH
3.
BRUSH
4. BOLT, THRU
5.
"0."
RING
6. WIRE LEAD
7. BALL
THRUST
8. ARMATURE
9. FRAME, MOTOR
10. SLEEVE
11 . WASHER, THRUST
12. SCREW, VENT AND FILLER
13. RESERVOIR
14. SEAL
15.
CASE, VALVE AND SEAR
16. BASE, PUMP
17. BOLT
18. SCREWS (8 REQ.)

Figure 6-3.

Reissued: 2D10
1/15/81

18
5

16

17
*

Hydraulic Pump/Reservoir,

2D10

Exploded View

HYDRAULIC SYSTEM
2D10

PIPER CHEROKEE SERVICE MANUAL

c. The valve body and gear case assembly (15) may be separated from the reservoir
(13) as follows:
1. Remove the screws from the flange of the body and separate the two assemblies.
2. The pump gears and valves should be removed for cleaning purposes only. To
remove cap securing gears, remove cap attaching bolts. There are two valve springs that
should be positively identified with their valve cavities.Otherwise, it will be necessary to
readjust each valve for proper operating pressure.
6-7. CLEANING,INSPECTIONAND REPAIRS OF HYDRAULICPUMP.
a. Discard all old O-rings.
b. Remove cap or plugs and clean all parts with a dry type cleaning solvent and dry
thoroughly.
NOTE
The conditions at repair require cleanliness,carefulness and
proper handling of parts. Ensure that foreign materials are
prevented from entering the system and that no parts are
damaged.
c. Inspect pump components for scratches, scores, chips, cracks and wear.
d. Inspect motor for worn brushes (minimum of.218 brush remains between the braided
wire and commutator end), excess commutator wear and excess bearing wear.

6-8. ASSEMBLYOF HYDRAULICPUMP. (Refer to Figure 6-3.)
a. The pump motor may be assembled and installed on the pump reservoirassembly as
follows:
1. Position the motor frame (9) on the reservoir (13). Note the aligning marks on
the frame and reservoir.
2. Place thrush washers ( 1), of the same amount removed, on the drive end of the
armature (8).
3. Lubricate the entire length of the armature shaft, on the drive end, with a light
grease to protect the O-ring seal from damage and insert the end of the shaft in the reservoir.
4. Saturate the felt oiling pad around the-commutator end bearing with SAE20 oil.
Allow excess oil to drain off before assembling motor.
5. Insert the thrust ball(7) in the bearing of the head assembly(1). To hold the ball
in position, place a small amount of light greaseinside the bearing.

Reissued: 1/15/81

2D11

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL
6. Place head assembly on frame and allow brushes to extend over commutator.
Remove the string securing the brushes in the holders. Push head assembly on frame and
insure proper indexing of head and frame assemblies. Secure in place with thru bolts (4).
7. Check freedom of rotation and end play (thrust) of the armature within
the assembly. A minimum of .005 of an inch end play is allowable. Should this
be incorrect, adjust by adding or removing thrust washers (11) on drive end of
armature shaft, as required.
b. The valve body and gear case assembly (15) may be assembled to the reservoir (13) as follows:
1. If removed, place the pump gears in the gear case and install cover.
Install cover attaching bolts and secure.
2. Lubricate the reservoir seal ring(14) with hydraulic fluid (MIL-H-5606)
and place it in the recess provided in the case (15).
3. Position the valve body and gear case assembly (15) with the reservoir
(13). Care should be taken when lining upthe armature drive with the pump gear.
Do not run the motor to do this.
4. Ascertain that the seal ring is properly positioned and install attaching
screws. Tighten the screws so that with the motor connected to a 14-volt source
and with an ammeter in the circuit, the current drawn does not exceed 12-amperes.
c. The base of the pump may be attached to the pump as follows:
1. With the pump in the up-side down position, lubricate "O" ring seals,
and install inthe recesses providedinthe valve body andgear case assembly (15).
2. Install attaching bolts with washers and torque to 70 inch pounds.
3. Safety attaching bolts with MS20995-C32 wire.
d. Conduct motor operational check not to exceed 10 seconds running time.
6-9.
a.

TEST AND ADJUSTMENT OF HYDRAULIC PUMP. (Refer to Figure 6-4.)
Test Equipment:
1. Hydraulicpump and mounting base.
2. Pressure gauge (0 to 1000 psi).
3. Pressure gauge (0 to 3000 psi).
4. Hoses with fittings to connect between base and gauges.
5. Power supply (14VDC).
6. Ammeter (0 to 100 amps).
7. Fuse or circuit protector (100 amp).
b. Test and Adjustment:
1. Connect a 0 to 1000 psi gauge to the low pressure port (port No. 3) of
the pump base. (The low pressure port, No. 3, is located nearest to the pipe
plug installed in the base.)
2. Connect a 0 to 3000 psi gauge to the high pressure port (port No. 1) of
the pump base. (The high pressure port, No. 1, is located farthest from the pipe
plug installed in the base.)

Reissued: 1/15/81

2D12

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

TABLE VI-II.

Electrical

CHARACTERISTICS, HYDRAULIC PUMP MOTOR

Characteristics:

Voltage
Rotation
Polarity
Operating Current
Operating Time
Overload Protection
Automatic Reset Time
Location, Automatic Reset

14DC
Reversible
Negative ground
18 amps, max. at 14volts
(both rotations)
5 to 10 seconds with a current load
of 100 amperes at 77° F
'Thermal circuit breaker
12 seconds, max.
Commutator end head of motor

Mechanical Characteristics:

Bearings

End Play, Armature

Reissued: 1/15/81

Absorbent bronze
(Drive end bearing in upper pump
and valve assembly casting.)
Steel ball
(Thrust, between commutator
end head and end of armature
- shaft.)
.005 inch, min.
(Adjust by selection of thrust
washers on drive end of armature shaft.)

2D13

HYDRAULIC SYSTEM

PIPER CHEROKEESERVICE MANUAL

922

GROUND-BLACK
HIGHPRESS
LOWPRESS.

- 14 V. D.
C.

Figure 6-4.

Reissued: 1/15/81

Test and Adiustments of Hydraulic Pump

2D14

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

3. Connect the black lead of the pump motor to the negative terminal of
the DC power supply.
- 4. Fill the pump reservoir and bleed all air from the attached lines. (Lines
may be bled by alternately connecting the blue electrical lead and green lead to.
the positive terminal of the power supply until all air is exhausted.)
5. Connect the blue lead to the positive terminal of the power supply. Pump
should operate and the high pressure gauge should indicate between 1600 to 2000
psi. (Should the pressure be incorrect, adjust valve "A", Figure 6-3, in pump
reservoir.)
6. Disconnect the blue lead, and the high pressure reading should not drop
more than 300psi in five minutes. High pressure may not be selected until after
five minutes.
7. Connect the green lead to the positive terminal of the power supply.
Pump should operate in reverse, dropping the high pressure gauge to zero and
the low pressure gauge should indicate between 500 to 800 psi. When the green
lead is disconnected, both pressure gauges should indicate zero psi. (Should the
pressure of 500 to 800 psi be incorrect, adjust valve "B", Figure 6-3, in pump
reservoir.)
NOTE
During test steps 5 thru 7, there should not be any
external leakage.
8. Should it be necessary to check the pump motor, first connect the ammeter in the electrical circuit with the positive terminal of the meter to the black
lead and the negative terminal of the meter to negative terminal of the DC power
supply.
9. Connect the blue lead to the positive terminal of the power supply. With
the high pressure indication within the 1600 to 2000 psi range on the pressure
gauge, the ammeter should read between 35 to 60 amperes. Disconnect the electrical lead.
10. Connect the green lead to the positive terminal of the power supply.
With the high pressure indication within the 500 to 800 psi range, the ammeter
should read between 15 to 35 amperes.
NOTE
In the event that any of the various tests do not perform satisfactorily,
the pump assembly should be
overhauled or replaced.

Reissued:

Reissued:
1/15/81

1/15/81

2D15

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

11. Connect the green lead to the
.power supply to drop pressures before
disconnecting the hydraulic lines.
3

6-10. INSTALLATION OF HYDRAULIC
PUMP.
a. Install the rubber shock mounts
through the mounting holes of the pump.
Insert a bushing through the holes of each
shock mount.
b. Position the pump on its mounting
flange. Install mounting bolt with washer
and tighten. (Refer to Figure 6-5.)
c. Connect the hydraulic lines to the
pump.

d. Connect the pump electrical leads.
Green wire to outboard relay, blue wire to

2

3.

WASHER
SHOCK

5.

BUSHING

4

PUMP BASE

7.

SHELF

MOUNT
6. BUSHING

inboard relay and black wire to ground on
Figure 6-5. Pump Shock Mounts
battery shelf.
e. Check fluid level in pump. Fill per instructions givenin Section II.
f. With the airplane on jacks, operate the pump to purge the hydraulic system of air,
and check for leaks. After operation, recheck fluid level.
6-11. FILLING HYDRAULIC PUMPRESERVOIR. To check fluid level, remove the plug
located on the forward side of the pump and ascertain that fluid is visible up to the bottom
of the filler plug hole. Should fluid be below the hole, add fluid, MIL-H-5606A,through the
filler hole until full. Reinstall the filler plug and tighten.
NOTE
A small vent hole is located under the vent screw head.
Retain 1/64 inch clearance between the screw head and the
small vent hole.
6-12. GEAR BACK-UPEXTENDER ACTUATORASSEMBLY.
6-13. REMOVAL OF GEAR BACK-UPEXTENDER ACTUATOR ASSEMBLY. (Refer to
Figure 6-6.) The back-up extender actuator is located under the rear seat. To reach the
actuator, remove the rear seats.
a. Disconnect the actuator electrical leads at-the quick disconnect terminals.
b. On early installations disconnect the manual override control rod (30) at the
actuator control arm (19) by removing cotter pin, washer, and clevis pin (1). On later
installations the control rod (30) is not connected to the actuator arm (19).
c. Disconnect the pressure (13) and static (11) hoses from the elbows (12) of the
diaphragm housing (10) by releasing clamps and sliding the hoses from their elbows. The
hoses should be tagged for ease of reassembly.
d. Place a shop cloth under the actuator hydraulic valve (25) to absorb fluid, and then
disconnect the hydraulic lines (5) and (25) from the elbows (4) and (27) of the hydraulic
valve (25). Cover the lines to prevent contamination.

Reissued: 1/15/81

2D16

HYDRAULIC SYSTEM

PIPER CHEROKEESERVICE MANUAL

1722
1. ALIGNINGTOOL
2. LANDINGGEAR OVERRIDESUPPORTBRACKET
3.

I

DIAPHRAGM SUPPORT BRACKET

Refer to Figure 6-11 for tool fabrication

Figure 6-6. Checking Aligning Brackets of Gear Back-Up Extender Actuator
e. Remove the machine screws that secure the actuator base to the mounting brackets.
There are two mounting screws at the inboard side of the base and one at the outboard side
of the diaphragm housing. Remove the actuator from the mounting brackets.
6-14. INSTALLATION OF GEAR BACK-UP EXTENDER ACTUATOR ASSEMBLY.
(Refer to Figure 6-7.)
a. Position the gear back-up extender actuator against its mounting brackets and install
attaching machine screws. Do not tighten screws.
NOTE
With the base attached and before installing the attaching
screw through the ring of the diaphragm housing, insure that
the attaching holes in the housing and mounting bracket align
without using force. Should they misalign, it may be
necessary to reform the main fuselage mounting bracket.
To reform the main fuselagemounting bracket, an Aligning
Tool may be used. (Refer to Figure 6-6.) This tool may be
fabricated from dimensions given in Figure 6-11. When
proper alignment has been accomplished, tighten the machine
screws.

Revised: 10/3/83

2D17

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL
b. On early installations connect the manual control push rod (30) to the actuator
control arm (19) using clevis pin (1). Place a washer over end of clevispin and secure with
cotter pin.
c. Move the actuator on its mounting brackets to allow the manual control push rod to
have maximum clearance from the left stabilator cable and center in the fairlead on the aft
face of the main spar box. Check system for sufficient travel and freedom of movement of
controls. Tighten actuator attaching screws.
NOTE
Care should be used when attaching the forward hose (13) to
the diaphragm assembly (10) so that no strain is placed on
the teflon bushing (15) and diaphragm shaft (16), thus
causing friction in movement.
d. Connect the hydraulic lines (5) and (26) to the elbows (4) and (27) of the actuator
hydraulic valve (25).
NOTE
A special fitting (27) with a restriction orifice of .063 of an
inch is installed in the side of the hydraulic valve (25). Do
not mistake this for a standard AN fitting.
e. Connect the pressure (13) and static (11) hoses to the elbows (12) of the diaphragm
housing (10). Secure hoses with clamps.
f. Connect the actuator electrical leads terminal to their mating terminals and insulate.
Refer to the electrical schematic for hookup.
g. Check the actuator adjustments as given in paragraph 6-15.
h. Install the rear seat.
6-15. CHECK AND ADJUSTMENT OF GEAR BACK-UP EXTENDER
ACTUATOR. (Refer to Figure 6-7.)
a. If diaphragm failure is suspected note the following:
1. If the landing gear retracts or extends at too high an airspeed or willnot retract
at all unless the back-up extender is placed in the override position, then the diaphragm is
possibly defective.
2. If it is determined that the diaphragm is defective, then remove the back-up
extender per instructions given in Paragraph 6-13 and install, Piper Kit No. 761 138V,
Back-Up Gear Extender Diaphragm Replacement. Instructions for installing the diaphragm
are included in the kit.
3. Following completion of Replacement Kit, reinstall the extender unit in the
aircraft and functionally test and adjust as outlined below and in Paragraph 6-16.

Reissued: 1/15/81

2D18

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PIPER CHEROKEE SERVICE MANUAL

b. Adjustment of the gear back-up extender actuator is preset to allow the hydraulic
valve (25) of the actuator to open when the airspeed is reduced below 105 MPH with the
engine power OFF. This adjustment is accomplished by setting the tension of springs (24)
on the actuator with adjustment screw (2).
NOTE
The airspeed at which the hydraulic valve of the actuator
opens was preset at the factory under ideal conditions. There
could be some variations at different altitudes and
atmosphere conditions.
CAUTION
The micro switch (21) on all units, and eccentric bolt (35) on
later units must not be adjusted. These components are set at
the factory under specific conditions, with the use of special
set-up equipment.
NOTE
This adjustment will require two persons, a qualified pilot
and a mechanic to set the actuator adjustment screw (2).
1. Remove the bottom of the rear seat.
2. The pivot screw (20) should be torqued 8 to 10 inch-pounds.
3. Loosen the jam nut (28) of the adjustment screw (2).
4. Ascertain that the electrical switch (21) will actuate with the use of the
emergency gear extension lever.
5. Fly the airplane (refer to Owner's Handbook). Should the spring tension be out
of adjustment very much, it may be necessary to assist gear retraction with the use of the
emergency gear extension lever moved to the up override position.
6. Loosen the adjustment screw (2) by turning counterclockwise until spring (24)
tension is free.
WARNING
While making adjustments, do not lay tools in area under seat
which may interfere with control of the airplane.
7. With the airplane at a safe altitude, slow the airplane to a glide of 110 MPH with
the gear selector handle up and the throttle reduced to power OFF. (Gear warning light and
horn will indicate when power is reduced.) At 110 MPH, slow the airplane at a rate of one
(1) MPH per second until 105 MPHis obtained, hold the airplane at this speed.

Reissued: 1/15/81

2D19

HYDRAULICSYSTEM

INTENTIONALLY LEFT BLANK

2D20

4~L

PIPERCHEROKEE SERVICEMANUAL

943.

943

I

I

I

I
I
I

I

SERIAL
PA-21R-110
INCL.
28-31078
28-31078
INCL.

NOS

21-30000
24-30483

TO
TO

AND
28-1073
NOS
SERIAL
PA-28R-200
UP.
28-30482.
NO'S
SERIAL
PA-28R-200
INCL.
TO 28-7232238
28-33001

PA-28R-200SERIALNO'S28-7235001
ANDUP.

DETAIL A
826

826
826
826

EAR.LY

PRESENT

LATE

DETAIL B

Figure 6-7. Gear Back-up Extender Actuator (Cont.)

Reissued: 1/15/81

2D 22

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

NOTE
On later installations, adjustment of the nut (32) may be
necessary to increase or decrease the spread between the gear
up and gear down actuation speeds. To expand the spread
between these speeds, loosen the nut. Tighten the nut to
bring the airspeeds closer together. Whenever the nut is
adjusted, it may be necessary to readjust the tension on the
springs (24) and to repeat the nut adjustment procedure. If
the eccentric bolt (35) is installed on the unit being adjusted,
CAUTION should be observed so as not to disturb its
position in relation to the rest of the unit.
8. With the glide established, turn the adjustment screw (2) clockwiseuntil the gear
drops. (First indication of gear dropping will be that the yellow intransit light comes ON.)
9. Climb again to a safe altitude and check that the gear drops at the correct
airspeed.
10. Land the airplane and tighten the adjustment screwjam nut (28).
c. - To check adjustment of electrical switch, the followingprocedure may be used:
1. Place the airplane on jacks. (Refer to Jacking, Section II.)
2. Move the mixture control back to idle cut-off and the throttle to full forward to
prevent gear warning horn from sounding during adjustment.
3. Ascertain that the actuator tension springs are properly adjusted according to
Step a.
4. Retract the landing gear hydro electrically by turning the master switch ON,
raising the emergency gear extension lever and moving the gear selector handle to the up
position. The emergency gear extension lever must be retained in the up position to keep
the gear up.
5. Check for proper switch operation by the following procedure:
(a) Turn master switch ON and move gear selector handle to the up position.
Pump should not operate.
(b) Move the emergency gear extension lever to the up override position. Pump
should operate and gear should retract.
(c) With selector lever up, slowly lower emergency gear extension lever to allow
gear to drop to down position. The pump should not operate at any time
during extension.
(d) Turn master switch OFF.
6. Check gear operation in the normal manner with the use of the gear selector
handle. The emergency extension lever must be held in the up override position.
7. Ascertain that gear is down and locked and remove airplane from jacks. Then
flight check the retractable landing gear system. (Refer to Paragraph 6-16.)

Reissued: 1/15/81

2D23

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

6-16. OPERATIONALCHECKOF RETRACTABLELANDINGGEAR SYSTEM.
a. Maximum Gear Extend: Place the gear selector in the down position at 150 MPH
(130 Kts). In approximately 5 to 10 seconds the three green gear lights should be on
indicating that the gear is down and locked.
b. Minimum Gear Retract: Allow approximately 8 seconds for the pressure in the
hydraulic system to normalize between gear extension and retraction. Place the selector
switch in the UP position at 125 MPH (109 Kts). In approximately 5 to 10 seconds all the
gear indicating lights should be out, indicating that the gear is fully retracted.
c. Override Gear Down and Up:
1. Down: Establish a normal glide at approximately 120 MPH (104 Kts), with
power at idle. Slowly move the override lever down, while observing the ammeter to
confirm that the hydraulic pump does not start. The gear should go down and lock. Move
the gear selector switch down. Release the override lever. The gear should remain down.
2. Up: Set maximum climb power. Maintain approximately 70 MPH (61 Kts) for
approximately 15 seconds. Move the gear selector switch to the up position. The gear should
not retract. Pull the override lever up. The gear should retract. Allow the airspeed to
increase to at least 120 MPH (109 Kts). Release the override lever and the gear should
remain up.

INTENTIONALLY LEFT BLANK

Reissued: 1/15/81

2D24

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

d. Gear "Back-Up" Down and Up:
1. Gear Down: Set power at idle. Glide the aircraft at 120 MPH (109 Kts).
Decrease the airspeed at the rate of 1 MPH (1 Kt) per second. The gear should start down
between. 100 and 110 MPH (87 to 96 Kts). Place the gear selector switch down, after the
gear is down and locked.
for
2. Gear Up: Set maximum climb power. Maintain approximately 70 MPH (61 Kts)
for approximately 15 seconds. Move the gear selector up. The gear should stay down and
locked. Increase the airspeed at the rate of 1 MPH (1 Kt) per second. The gear should begin
to retract between 80 and 90 MPH (70 and 78 Kts) at zero density altitude. The speed at
which the gear starts up will increase 1.5 MPH (1.3 Kts) for each 1000' increase of density
altitude.
3. Manual Override Up Latch: With the gear up, the aircraft in normal flight
configuration, select up on the gear override lever. Engagethe up latch. The amber up latch
warning light, below the gear selector switch, should be flashing.Gradually slow the aircraft
below the auto gear extend speed and observe that the gear stays fully retracted. Disengage
the up latch. The flashing amber warning light should stay out.
e. Gear Indicator Lights:
1. The green lights indicate when the correspondinggear is in the down and locked
position. Turn landing light switch on and off- observe ammeter for indication.
2. The amber light indicates when the gear is in an intermediate position, neither
fully up nor down.
3. The Red gear warning light will indicate an unsafe condition. It will indicate
when the throttle setting is less than 14 ± 2 inches of manifold pressure while the gear is not
down and locked. It will also indicate when the gear is down and locked while the selector is
in the UP position, except at full throttle.
f. The Gear WarningHorn: It will sound wheneverthe red gear warning light is on.
g. Micro Switch Check:
1. The forward throttle micro switch is checked by moving the throttle full
forward while the gear is down and the gear selector switch is in the up position. The horn
should stop sounding and the red light should go out. Retard the throttle slightly and the
horn and light should come on.
2. The aft throttle micro switch setting is-checked as follows: with the gear up,
reduce the throttle at a normal rate. The gear warning horn and the red light should come
on at 14 inches of manifold pressure ± 2".

2E1

HYDRAULICSYSTEM

PIPER CHEROKEE SERVICE MANUAL

1706

SYNCRODEVICES
CYLINDER

4

EARLY

1.
2.
3.
4.
5.
6.
7.
8.
9.

SNAP RING
END GLAND
BACK-UP RING
"0" RING
"0" RING
PISTON
BODY, CYLINDER
"O" RING
SAFETY WIRE

GAR-KENYON
CYLINDER
LATER

Figure 6-8. Nose Gear Actuating Cylinder

Reissued: 1/15/81

2E2

HYDRAULICSYSTEM

PIPER CHEROKEE SERVICE MANUAL

6-17. NOSE GEAR ACTUATINGCYLINDER.
6-18. REMOVALOF NOSE GEAR ACTUATINGCYLINDER.
a. Place the airplane on jacks. (Refer to Jacking, Section II.)
b. Disconnect the hydraulic lines from the actuating cylinder and cover the open line
ends to prevent contamination.
c. Disconnect the cylinder operating rod end from the downlock hook by removing
attachment nut and bolt.
d. Disconnect the cylinder from its attachment fitting by removingnut and bolt.
e. Remove the cylinder from the wheel well.
6-19. DISASSEMBLYOF NOSE GEAR ACTUATINGCYLINDER. (Refer to Figure 6-8.)
a. With the cylinder removed from the airplane, remove the fitting from the piston rod
(6) end of the cylinder (7). Mark the position of the fitting to facilitate reinstallation.
b. On Syncro Devicesnose gear actuating cylinders remove the snap ring (1) from the
annular slot in the end of the housing. On Gar-Kenyonnosegear actuating cylinder remove
safety wire (9) and unscrew end gland(2).
c. On Syncro Devices Assemblies pull the piston (6) with end gland (2) from the
cylinder housing. On Gar-Kenyon Assembliesremove piston (6) after unscrewingend gland
(2).
6-20. CLEANING, INSPECTION, AND REPAIR OF NOSE GEAR ACTUATING
CYLINDER.
a. Clean the cylinder parts with a suitable dry type solvent and dry thoroughly.
b. Inspect the cylinder assemblyfor the following:
1. Interior walls of the cylinder and exterior surfaces of the piston for scratches
burrs, corrosion, etc.
2. Threaded areas for damage.
3. Rod end fitting and swivel fitting of cylinder for wear and corrosion.
c. Repairs to the cylinder and limited to polishing out small scratches, burrs, etc. and
replacing parts.

Reissued: 1/15/81

2E3

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

BEARING
END

Figure 6-9. End Gland Locking Device

6-21. ASSEMBLY OF NOSE GEAR ACTUATING.CYLINDER. (Refer to Figure 6-8.)
a. Install "O" ring (5) on the exterior of the end gland (2).
b. Install 'O" ring (4) in the interior of the end gland. The Syncro DevicesAssemblies
also includes a ring back-up (3) with the "O" ring (4)
c. Install "O" ring (8) on the body of the piston assembly.
d. Lubricate the areas around the "O" rings with hydraulic fluid, slide the end gland on
the piston rod and the piston into the cylinder housing (7).
e. Secure the end gland in the cylinder by installing the snap ring ( 1)in the annular slot
in the Syncro Devices cylinder. The end gland on the Gar-Kenyon cylinder is secured by
threading gland into cylinder body (7) and securing with safety wire (9).
f. Install restrictor fitting in the piston rod end of the cylinder.
g Check smoothness of operation of the piston.

Reissued:1/15/81

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

1767

N'•

1
2.
3
4.
5.
6.
7.
8.
9.
10.

\

END GLAND
BACK-UP RING
"O"
RING
RETAINER RING
"O"
RING
PISTON
CYLINDER BODY
"0"
RING
CLEVIS
BEARING

Figure 6-10. Main Gear Actuating Cylinder

Reissued:
Issued:
1/15/81

2E5

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

6-22. INSTALLATIONOF NOSE GEAR ACTUATINGCYLINDER.
a. Attach the cylinder to its attachment fitting using bolt and nut.
b. Attach the operating rod end to the downlock link using bolt. Install nut after
adjustment is completed.
c. Connect the hydraulic lines to the cylinder fittings.
d. Check the adjustment of the cylinder rod end. (Refer to Adjustment of Nose
Landing Gear, Section VIIA.)
e. Operate pump to purge system of air and check fluid level in reservoir.
f. Remove the airplane from jacks.
6-23. MAINGEAR ACTUATINGCYLINDER.
REMOVALOF MAIN GEAR ACTUATINGCYLINDER.
a. Place the airplane on jacks. (Refer to Jacking, Section II.)
b. Disconnect the hydraulic lines from the actuating cylinder and cover the open line
ends to prevent contamination.
c. Disconnect the gear downlock spring from the swivelfitting at the upper end of the
spring.
d. Remove the downlock spring swivel fitting and disconnect the cylinder operating
rod end from the upper side brace retraction fitting by removing the attaching nut. washer
and bolt.
e. Disconnect the cylinder from its attachment by removing nut and bolt.
f. Remove the cylinder from the wheel well.
6-25. DISASSEMBLY OF MAIN GEAR ACTUATING CYLINDER. (Refer to Figure 610.)
a. With the cylinder removed from the airplane, push the piston rod (6) (by hand)
toward the clevis(9) to remove oil from the unit.
b. Put clevis(9) only in a soft jaw vise and clamp against the clevisbearing (10).
c. If no pipe fitting is installed in the port of the end gland (1), install a fitting (1/8 27) into the port. This fitting need not be tight as it willbe used for leverageonly.
d. Rotate the gland (with use of fitting) until the end of the gland lock ring (4) shows
in the slot in the cylinder body (7). Reverserotation of the gland to allow the lock ring to
move out of the slot. (Refer to Figure 6-9.) (It may be necessaryto give the ring an assist to
start out of the slot. If so, insert a strong wire pick or other availabletool in the slot to lift
up the end of the ring and then rotate gland.)
e. Pull the piston (6) and end gland from the cylinder.
f. Remove O-ringsas desired.

Reissued: 1/15/81

2E6

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

6-26. CLEANING, INSPECTION AND REPAIR OF MAIN GEAR ACTUATING
CYLINDER.
a. Clean the cylinder parts with, a suitable dry type solvent and dry thoroughly.
b. Inspect the cylinder assemblyfor the following:
1. Interior walls of cylinder and exterior surfaces of piston for scratches, burrs,
corrosion, etc.
2. Threaded areas for damage.
3. End fitting retainer slot for excess wear.
4. Rod end fitting and swivelfitting of cylinder for wear and corrosion.
c. Repairs to the cylinder are limited to polishing out small scratches, burrs, etc. and
replacing parts.
6-27. ASSEMBLY OF MAIN GEAR ACTUATING CYLINDER. (Refer to Figure 6-10.)
a. Install O-ring (5) on the exterior of the end gland (1).
b. Install O-ring (3) and back-up ring (2) in the interior of the end gland.
c. Install O-ring (8) on the body of the piston assembly.
d. Lubricate the areas around the O-ringswith hydraulic fluid, park-o-lubeor vaseline,
slide the end gland on the piston rod and the piston into the cylinder housing (7).
e. Insert the hook end of a new lock ring (4) (P/N 755 997) in the slot in the cylinder
body (7) and slot in the end gland (1). Rotate gland to completely wrap lock ring into
assembly.
f. Align port in end gland and cylinder body.
g. Check smoothness of operation of piston and static pressure test unit to check for
possible cut O-rings.
6-28. INSTALLATIONOF MAIN GEAR ACTUATINGCYLINDER.
a. Attach the cylinder to its attachment fitting in the wheel well using bolt and nut.
b. Attach the operating rod end and downlock spring swivel fitting to the upper side
brace retraction fitting by using bolt, washer and nut. Ascertain swivel fitting is free to
rotate.
c. Connect the downlock spring to the swivel fitting.
d. Check the adjustment of the cylinder rod end. (Refer to Adjustment of Main
Landing Gear, Section VIIA.)
e. Operate pump to purge system of air and check fluid level in reservoir.
f. Remove the airplane from jacks.
6-29. HYDRAULICLINES.
6-30. REMOVAL AND INSTALLATION OF HYDRAULIC LINES. Remove a damaged
hydraulic line by disconnecting the fitting at each end and by disconnecting where secured
by brackets. Refer to Figure 6-2 as an aid in the location of attaching brackets and bends in
the lines. Provide a small container for draining the line. Install a new or repaired line in
reverse. Operate the pump to purge the system of air and check fluid level in reservoir

Reissued: 1/15/81

2E7

HYDRAULIC SYSTEM

INTENTIONALLY LEFT BLANK

2E8

PIPER CHEROKEE SERVICE MANUAL

TABLE VI-III.

HYDRAULIC SYSTEM TROUBLESHOOTING

Trouble

Cause

Remedy

Landing gear retraction
system fails to operate.

Landing gear actuator
circuit breaker open.

Reset circuit breaker
and determine cause
for open circuit
breaker.

Landing gear selector
circuit breaker open.

Reset circuit breaker
and determine cause
for open circuit
breaker.

Landing gear actuator
circuit wires broken.

Check wiring.

Landing gear selector
circuit wires broken.

Check wiring.

Safety (squat) switch
out of adjustment.

Readjust switch (Refer
toAdjustment of Safety
Switch, Section VIIA.)

Squat switch inoperative.

Replace switch.

Pressure switch
inoperative.

Replace switch.

Pump retraction
solenoid inoperative (inboard
solenoid).

Replace solenoid.

Reissued:1/15/81

2E9

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PIPER CHEROKEE SERVICE MANUAL

TABLE VI-Ill.

HYDRAULIC SYSTEM TROUBLESHOOTING (cont)

.Trouble

Cause

I

Remedy

NOTE
If the retracting solenoid of the pump can be heard to
actuate when operating the gear selector switch, it may
be assumed that the gear control circuit is operating
properly and the actuator circuit should be further
checked.
Landing gear retraction
system fails to operate (cont.)

Reissued: 1/15/81

Gear selector switch
ground incomplete.

Check ground.

Gear selector switch
inoperative.

Replace switch.

Hydraulic pump ground
incomplete.

Check ground.

Hydraulic pump inoperative.

Replace or overhaul
pump.

Auxiliary extender
switch inoperative.

Replace unit..

Hydraulic fluid In
reservoir below
operating level.

Fill reservoir with
hydraulic fluid.

Battery low or dead.

Check condition of
battery.

2E10

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

TABLE VI-III.

HYDRAULIC SYSTEM TROUBLESHOOTING(cont)

Trouble
Landing gear retraction
system fails to operate (cont.).

Cause

Remedy

Pressure head air
passage obstructed. *

Clearobstruction.

Pressure head hose
off.*

Reconnect hose.

Split or hole in diaphragm of auxiliary
extender. *

Replacediaphragm.
Refer to the latest
revisionof Piper Service
Letter No. 810.

*Can be checked by
using override.

Landing gear extension system fails to
operate.

Reissued: 1/15/81

Landing gear actuator
circuit breaker open.

Reset circuit breaker
and determine cause
for open circuit
breaker.

Landing gear selector
circuit breaker open.

Reset circuit breaker
and determine cause
for open circuit
breaker.

Landing gear actuator
circuit wires broken.

Check wiring.

Landing gear selector
circuit wires broken.

Check wiring.

2Ell

HYDRAULIC SYSTEM

PIPER CHEROKEESERVICE MANUAL

TABLE VI-III.

HYDRAULIC SYSTEM TROUBLESHOOTING (cont)

Trouble

Cause

Landing gear extension
system fails to operate (cont.).

Pump extension solenoid inoperative (outboard solenoid).

Remedy
Replace solenoid.

NOTE
If the extension solenoid of the pump can be heard to
actuate when operating the gear selector switch, it may
be assumed that the gear control circuit is operating
properly and the actuator circuit should be further
checked.

Reissued: 1/15/81

Gear selector switch
ground incomplete.

Check ground.

Gear selector switch
inoperative.

Replace switch.

Hydraulic pump ground
incomplete.

Check ground.

Hydraulic pump inoperative.

Replace or overhaul
pump.

Hydraulic fluid in
reservoir below
operating level.

Fill reservoir with
hydraulic fluid.

Low or dead battery.

Check condition of
battery.

2E12

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

TABLE VI-III.

HYDRAULIC SYSTEM TROUBLESHOOTING(cont)

Trouble

Cause

Landing gear retraction
extremely slow.

Hydraulic fluid in reservoir below operating
level.

Fill reservoir with
hydraulic fluid.

Restriction
lines.

Isolate and check hydraulic lines.

Pump stops during gear
retraction.

Pump stops during gear
extension.

Reissued: 1/15/81

in hydraulic

Remedy

Shuttle valve sticking in
pump base.

Check cause.

Landing gear actuator
circuit breaker opens.

Reset circuit breaker
and determine cause
for overload.

Landing gear selector
circuit breaker opens.

Reset circuit breaker
and determine cause
for overload.

Pressure switch out of
adjustment.

Remove and readjust or
replace switch.

Mechanical restriction
or obstruction in hydraulic system to allow
pressure to build up
and shut off pump before gear has retracted.

Place airplane on jacks
and run retraction
check. Isolate and
determine cause.

Shuttle valve sticking in
pump base.

Check cause.

Landing gear actuator
circuit breaker opens.

Reset circuit breaker
and determine cause
for overload.

Landing gear selector
circuit breaker opens.

Reset circuit breaker
and determine cause
for overload.

2E13

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

TABLE VI-III.

HYDRAULIC SYSTEM TROUBLESHOOTING(cont)

Trouble
Pump fails to shut off
though gear has fully
retracted.

Cause
Pressure
erative.

switch inop-

Remedy
Replace switch.

Pressure switch out of
adjustment.

Replace switch.

Pump retraction solenoid sticking (inboard
solenoid).

Replace solenoid.

Internal leakage of
system.

Check back-up extension unit valve for
internal leakage.
Check gear actuating
cylinders for internal
leakage.
Check for internal damage to hydraulic pump.

External leakage of
system.

Check back-up extension unit valve for
external leakage.
Check gear actuating
cylinders for external
leakage.

Reissued: 1/15/81

2E14

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

TABLE VI-III.

HYDRAULIC SYSTEM TROUBLESHOOTING(cont)

Trouble
Pump fails to shut off
though gear has fully
retracted
(cont.).

Pump fails to shut off
though the gear has
fully extended.

Reissued: 1/15/81

Cause

Remedy

External leakage of
system .(cont.).

Check for broken or
damaged hydraulic
lines or hoses.

Pump relief valve out
of adjustment.

Replace pump.

Pump extension solenoid sticking (outboard solenoid).

Replace solenoid.

Nose gear down limit
switch actuator out
of adjustment.

Adjust switch actuator
(Refer to Adjustment
of Nose Gear Down
Limit Switch, Section
VIIA.)

Nose gear down limit
switch failed.

Replace switch.

Main gear down limit
switch out of adjustment.

Adjust switch (Refer to
Adjustment of Main
Gear Down Limit
Switch, Section VIIA.)

Main gear down limit
switch failed.

Replace switch.

2E15

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

TABLE VI-III.
Trouble

HYDRAULIC SYSTEM TROUBLESHOOTING (cont)
Cause

Remedy

NOTE
The out of adjustment or failed switch may be determined by noting which down light is not lit.
Pump running intermittently after gear
has retracted.

Leakage of high pressure check valve.

Remove pump and replace check valve.

Internal leakage of
system.

Check auxiliary retraction unit valve for
internal leakage.
Check gear actuating
cylinders for internal
leakage.

External leakage of
system.

Check back-up extension unit valve for
external leakage.

Check gear actuating
cylinders for external
leakage.
Check for broken or
damaged hydraulic
lines.

Gear stops part way
up, but pump continues to run.

Reissued: 1/15/81

Pump high pressure
relief valve out of
adjustment.

2E16

Replace pump.

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

TABLE VI-III.

HYDRAULIC SYSTEM TROUBLESHOOTING(cont)

Trouble
Gear stops part way up,
but pump continues to
run (cont.).

Cause
Internal leakage of
system.

Remedy
Check back-up extension unit valve for
internal leakage.
Check gear actuating
cylinders for internal
leakage.
Check for broken or
damaged hydraulic
lines.

Hydraulic fluid in
reservoir below
operating level.

Fill reservoir with
hydraulic fluid.

All gears fail to
free fall.

Back-up extension unit
valve fails to open.

Check unit and valve
and replace.

Gear free falls at
air speeds above
that required.

Back-up extender unit
hydraulic valve fails
to close.

Check extender unit
spring adjustment.
Check hydraulic valve
for sticking open.
Check extender unit
diaphragm for damage.
Check for restriction in
air pressure and static
lines.

Reissued: 1/15/81

2E17

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

TABLE VI-III.

HYDRAULIC SYSTEM TROUBLESHOOTING(cont)

Trouble
Landing gear fails to
operate at required
speeds. (Gear up at
85 mph , gear down
at 105 mph.)

Landing gear will not
retract after selecting
up at an airspeed above
actuator speed. (Also,
upon trying to over-ride
it is found that only with
a steady pressure can
the over-ride be activated. After gear does
retract and the override lever (manual
extruder) is relaxed
(approximately 11 to
15 seconds.) the gear
will fall free.

Reissued:1/15/81

Cause

Remedy

Manual control rod
between over-ride
lever (manual extruder) and rear
seat rubbing or
chafing on spar web
where rod passes
beneath the spar.

Form the rod to allow
clearance through full
fore and aft travel.

Friction or tight
connection at any of
the attachment points
(pivot points) of the
over-ride lever or
actuator arm.

Clean, free and lubricate all pivot points.

Binding of diaphragm
shaft caused by build
up of sand or dirt.

Clean all moving parts.

Restriction in pressure head of gear
back-up extender
actuator.

Disconnect hoses at
back-up extender and
clean out hoses and
head.

2E18

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

TABLE VI-III.

HYDRAULIC SYSTEM TROUBLESHOOTING(cont)

Trouble

Cause

Remedy

With gear selector down
and three green lights
on, in transit light
comes on or intermittently on.

Shorted gear up
solenoid.

Replace solenoid.

With gear selector down
and three green lights
on, pump motor circuit
breaker opens.

Shorted gear up
solenoid.

Replace solenoid.

With in transit light on,
pump operates on and
off.

Shorted gear down
solenoid.

Replace solenoid.

With in transit light on,
pump motor circuit
breaker opens.

Shorted gear down
solenoid.

Replace solenoid.

Reissued: 1/15/81

2E19

HYDRAULIC SYSTEM

PIPER CHEROKEE SERVICE MANUAL

A659

ALLEN SET-SCREW

.25

MATERIAL: Steel

Figure 6-11. Gear Back-up Extender Actuator Aligning Tool

Reissued: 1/15/81

2E20

HYDRAULIC SYSTEM

INTENTIONALLY LEFT BLANK

2E21

SECTION VII
LANDING GEAR AND BRAKE SYSTEM
(PA-28-140, -150, -160, -180, -235)
Paragraph
7-1.
7-2.
7-3.
7-4.
7-5.

7-14.

7-21.

7-28.
7-29.

Aerofiche
Grid No.
Introduction ..................................................
Description ..................................................
Troubleshooting ...............
Landing Gear System .........................................
Nose Landing Gear ...........................................
7-6.
Disassembly of Nose Gear Oleo .......................
Cleaning. Inspection and Repair of Nose Gear Oleo ......
7-7.
7-8.
Nose Gear Oil Orifice Retainer Ring Installation .........
7-9.
Assembly of Nose Gear Oleo ..........................
7-10.
Removal of Nose Landing Gear .......................
7-11.
Cleaning, Inspection and Repair of Nose
Landing Gear ........................
Installation of Nose Landing Gear .....................
7-12.
Alignment of Nose Gear ..............................
7-13.
Main Landing Gear ..........................................
7-15.
Disassembly of Main Gear Oleo .......................
7-16.
Cleaning, Inspection and Repair of Main
Gear Oleo ......................................
Assembly of Main Gear Oleo .........................
7-17.
Removal of Main Landing Gear .......................
7-18.
Cleaning, Inspection and Repair of Main
7-19.
Landing Gear ........................
Installation of Main Landing Gear .....................
7-20.
Wheels ......................................................
Removal and Disassembly of Nose Wheel ...............
7-22.
Inspection of Nose Wheel Assembly ....................
7-23.
Assembly and Installation of Nose Wheel ...............
7-24.
Removal and Disassembly of Main Wheel ..............
7-25.
Inspection of Main Wheel Assembly ...................
7-26.
Assembly and Installation of Main Wheel ...............
7-27.
.............
Brake System ..............................
Wheel Brake Assembly ........................................
Brake Adjustment and Lining Tolerance ................
7-30.
Removal and Disassembly of Wheel Brake
7-31.
................
Assembly ......................

Reissued: 1/15/81

2E22

2E24
2E24
2E24
2F1
2F1
2FI
2F3
2F3
2F4
2F5
2F5
2F5
2F7
2F10
2F10
2F11
2F11
2F18
2F18
2F20
2F20
2F20
2F22
2F22
2F22
2F23
2F24
2F24
2F24
2F24
2G1

Paragraph

Aerofiche
Grid No.

7-32.

7-34.

7-40.

7-46.

7-52.

Cleaning, Inspection and Repair of Wheel
Brake Assemblies ................................
7-33.
Assembly and Installation of Wheel Brake
Assembly.......................................
Brake Master Cylinder ........................................
7-35.
Removal of Brake Master Cylinder ....................
7-36.
Disassembly of Brake Master Cylinder .................
7-37.
Cleaning. Inspection and Repair of Brake
Master Cylinder.................................
7-38.
Assembly of Brake Master Cylinder ...................
7-39.
Installation of Brake Master Cylinder
(Hand Brake) ...................................
Parking Valve................................................
7-41.
Removal of Parking Valve ............................
7-42.
Disassembly of Parking Valve .........................
7-43.
Cleaning. Inspection and Repair of Parking
Valve ..........................................
7-44.
Assembly of Parking Valve ...........................
7-45.
Installation of Parking Valve..........................
Brake Cylinder (Toe Brake)..............................
7-47.
Removal of Brake Cylinder ...........................
7-48.
Disassembly of Brake Cylinder ........................
7-49.
Cleaning, Inspection and Repair of Brake
Cylinder........................................
7-50.
Assembly of Brake Cylinder...........................
7-51.
Installation of Brake Cylinder .........................
Brake Bleeding Procedure .....................................
7-53.
Brake Bleeding Procedure (Gravity) ....................
7-54.
Brake Bleeding Procedure (Pressure) ...................
7-55.
Brake System Leak Check ............................
Bleeding of the Brakes After a Unit has
7-56.
Been Changed...................................

Reissued: 1/15/81

2E23

2G4
2G4
2G4
2G4
2G6
2G7
2G7
2G10
2G11
2G 11
2G11

.....

2G11
2G11
2G13
2G13
2G13
2G13
2G14
2G16
2G17
2G17
2G17
2G17
2G19
2G19

PIPER CHEROKEE SERVICE MANUAL

SECTIONVII
LANDING GEAR AND BRAKE SYSTEM
PA-28-140, -150, -160, -180 and -235
7-1. INTRODUCTION. In this section are instructions for the removal, disassembly,
inspection, overhaul and installation of the various landing gear and brake system
components used on the alignment of the nose gear, and the repair and serviceof the brake
system.
7-2. DESCRIPTION. The landing gear incorporated on the PA-28-140,-150, -160,-180 and
-235 airplanes is a fixed tricycle type, fitted with three 600 x 6 wheels. The landing gear
struts are of the air-oil type. The nose gear, steerable through a wide arc, enables a short
turning radius in each direction. (For turning arc of each airplane by serialnumber, refer to
Table VII-I.) To aid in nose wheel and rudder centering and to provide rudder trim there is a
spring device attached to the rudder pedal torque tube assembly. A shimmy dampener is
also incorporated in the nose wheel steering mechanism. Bungee springs are also
incorporated on the push rods of later models. (1974 models and up) These springs make
lighter and smoother ground steering possible.
The two main wheels are equipped with a singledisc hydraulic brake assemblywhich is
actuated by a hand lever connected to a cylinder located below and behind the center of the
instrument panel, or by individual cylinders attached to each rudder pedal. The hand lever
also doubles as a parking brake and may be operated by pulling back on the handle and
pulling out the parking brake tee handle, holding it until the hand lever is released or
pushing in on the button at the side of the handle. To disengage the parking brake, either
push in on the tee handle or pull back on the hand brake handle. A brake fluid reservoir is
installed on the left forward face of the engine firewall.
7-3. TROUBLESHOOTING.Troubles peculiar to the landing gear are listed in Table VII-II,
at the back of this section, along with their probable causes and suggestedremedies. When
troubleshooting the landing gear system, it may be found that it is necessary to place the
airplane on jacks. If so, refer to Jacking, Section II.

2E24

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

7-4.

LANDING GEAR SYSTEM.

7-5.

NOSE LANDINGGEAR.

7-6. DISASSEMBLY OF NOSE GEAR OLEO. (Refer to Figure 7-1.) The nose
gear oleo strut assembly maybe removed and disassembled from the strut housing with the gear removed from or installed on the airplane.
a. Remove the lower engine cowling by the following procedure:
1. Release the cowl fasteners, two on each side and remove the top cowl.
2. Disconnect the electrical lead to the landing light at the quick disconnect
at the inside of the bottom cowl.
3. Remove the bottom cowl attaching screws from around its aft end and
remove cowl.
b. Place airplane on jacks. (Refer to Jacking, Section II.)
c. Place a drip pan under the nose gear to catch spillage.
d. To remove air from the strut, depress the air valve core pin found at the
top of the strut assembly. After the pressure in the strut chamber has diminished, remove the valve core pin, and attach a small hose to the air valve, and
drain the fluid by slowly compressing the piston tube. If it is desirable to extract more fluid from the strut chamber, remove the filler plug, insert the siphon hose and drain fluid from the upper area of the housing.
e. To remove the strut assembly from the strut housing (4), cut the safety
wire at the top of the housing that secures the steering horn attaching bolt to the
tube retainer nut. Then remove the steering horn attaching bolt and the flat head
pin, thus relieving the steering horn from the top of the strut housing.
f. Loosen the strut assembly retainer nut (1) that secures the strut assembly
in the strut housing. At the same time, slide the strut assembly out through the
bottom of the strut housing. Remove the nut (1) and washer (2) from the top of
the strut housing after the assembly is removed.
NOTE
The strut assembly may fit tight inside of the housing.
It may be necessary to tap the top of the fork with a
plastic mallet.
g. If desired, remove the top and bottom bearing (3 and 5) from the strut
housing. The bearings are compressed slightly into place, and light tapping may
be needed to free them.

Reissued: 1/15/81

2F1

LANDINGGEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

1768

18

2.
3.
4.
5.
6.
7.
8.

RING
1973

PA-28-180

AND

PA-28-235

,RETAINER

SERIAL

Figure 7-1.

Reissued: 1/15/81

NOS.

AND

UP

9.
10.
11.
12.
13.
14.
15.
17.
17.
18.
19.

NUT, RETAINER
WASHER
BEARING, TOP
STRUT HOUSING
BEARING, BOTTOM
CAP, VALVE
PLUG, FILLER
TUBE METERING
CYLINDER
RING, RETAINER
SNAP RING
BEARING
"0"
RING, PACKING
"0"
RING OR QUAD RING
WASHER,
CACK-UP
WIPER STRIP
TUBE, PISTON
"0"
RING
PLUG, PISTON TUBE

Nose Gear Oleo Strut Assembly

2F2

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL-

h. To remove the piston tube and fork assembly (17) from the cylinder (9), proceed as
follows:
1. Separate the upper and lower torque links by removing the connecting nut,
washer and bolt.
2. Compress the piston tube and fork assembly slightly and remove the retainer
ring (10) from the annular slot in the bottom of the cylinder tube. Then remove piston tube
and fork assembly by sliding out from the bottom of the cylinder tube.
i. To remove the bearing assembly from the piston tube, release the snap ring (11)
from the top of the piston tube and slide bearing assemblyoff the end.
1. If desired, carefully remove the wiper strip (16), back-up washer (15) and quad
ring or "O" ring (14) from the inside of the bearing sleeve,and also the "0" ring gasket (13)
from the outside of the bearing sleeve.
j. To remove the piston tube plug (19) with "O" ring (18) located in the lower end of
the tube, the following procedure may be used:
1. Remove the nose wheel from the fork as described in paragraph 7-22.
2. Loosen and remove the bolt, washer and nut that extends through the piston
tube and block assembly.
3. Push the plug through the top of the piston tube by use of a rod inserted
through the bottom of the tube.
7-7. CLEANING,INSPECTIONAND REPAIROF NOSE GEAR OLEO.
a. Clean all parts with a suitable dry type cleaningsolvent.
b. Inspect the landing gear oleo assemblycomponent for the following:
1. Cylinder tube assemblyfor corrosion, scratches, nicks and excessivewear.
2. Lock rings for cracks, burrs, wear.
3. Fork assemblyfor corrosion, scratches, nicks, and misalignment.
4. Link assembly for elongated holes, cracks, corrosion, scratches, nicks and
straightness.
5. General condition of air valve.
c. Repair of the oleo is limited to smoothing out minor scratches, nicks and dents and
replacement of parts.
7-8. NOSE GEAR OIL ORIFICE RETAINER RING INSTALLATION.(Refer to Figures
7-1 and 7-22.)
a. With the piston tube (17) and fork removed from the cylinder (9), ascertain that all
traces of the old retainer ring (10) are removed from the meteringtube (8).
b. A tool can be fabricated to simplify the installation of the new retainer ring. (Refer
to Figure 7-22.)
c. With the use of the fabricated tool, position the new retainer ring on the end of the
tool with the locating stud.
d. Insert the tool into the cylinder (9), with the centering stud positioned into the hole
in the base of the metering tube (8).
e. Hold the tool tightly against the metering tube and slide the sleeve of the tool
towards the metering tube. This will move the new retainer ring (10) over the end of the
metering tube and position itself into the groove of the metering tube (8).

Reissued: 1/15/81

2F3

LANDINGGEAR AND BRAKE SYSTEM

PIPER CHEROKEESERVICE MANUAL

7-9. ASSEMBLY OF NOSE GEAR OLEO. (Refer to Figure 7-1.)
a. Ascertain that all parts are cleaned and inspected.
b. To install the piston tube plug, proceed as follows:
1. Lubricate thetube plug(19) and "O" ring(18) with hydraulic fluid (MILH-5606) and install the "O" ring on the plug.
2. Lubricate the inside wall of the piston tube, and insert the plug into the
top of the tube, pushing it to the fork end.
3. Align the bolt holes of the fork, tube and plug; install the bolt, washer
and nut.
c. Carefully install in the bearing sleeve the quad ring (14), back-up washer
(15) and the wiper strip (16). Slide the "O" ring (13) in place on the outside of
the sleeve.
d. Lubricate the bearing assembly and carefully install it on the piston tube
(17).
e. Position the snap ring (11) on the upper end of the piston tube.
f. Insert the piston tube with bearing assembly in the cylinder tube (9). Secure
it with the retainer ring (10) in the annular slot at the bottom of the tube.
g. Connect the torque links on the tube and fork securing them with a bolt,
washer and nut. Tighten the nuts only tight enough to retard side play, but still
allowing the links to rotate freely.
h. Ascertain that the upper and lower bearings (3 and 5) are installed in the
strut housing. Bearings are a press fit with the grooves in the inner and outer
races in the up position.
i. Position washer (2) and strut assembly retainer nut (1) on top of the strut
housing. Insert the strut assembly up through the washer until it contacts the nut.
Tighten the nut to a snug fit.
j. To install the steering horn assembly, insert the flat head pin through the
side of the horn and top of the strut assembly. When it protrudes through the
other side of the steering horn, install the washer and secure with a cotter pin.
k. Install the steering horn attaching bolt through the top of the horn into the
strut assembly. Do not tighten bolt at this time. If a space appears between the
steering horn plate and the top of the strut assembly, it will then be necessary
to install spacer washer(s), (AN960-416L), between the horn and strut. Then
tighten the bolt and safety the bolt to the strut assembly retainer nut (1) with
MS20995C40 wire.
1. Compress and extend the strut several times to ascertain that the strut will
operate freely. The weight of the gear wheel and fork should allow the strut to
extend.
m. Service the oleo strut with fluid and air. (Refer to Oleo Struts, Section II.)
n. Check the gear for alignment. (Refer to Alignment of Nose Landing Gear,
Paragraph 7-12.)

Reissued: 1/15/81

2F4

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

7-10. REMOVAL OF NOSE LANDING GEAR. (Refer to Figure 7-2.)
a. Remove the engine cowling by the following procedure:
1. Release the fasteners, two on each side and two at the top of the cowl.
2. Lift the aft end of the top cowl and then slide it forward to release the
two stud type front fasteners.
Remove the top cowl.
3. Disconnect the electrical lead to the landinglightat the quick disconnect
at the right inside of the bottom cowl.
4. Remove the bottom cowl attaching screws from around its aft end and
remove the cowl.
b. Remove the propeller.
(Refer to Removal of Propeller, Section VIII.)
c. Place the airplane on jacks. (Refer to Jacking, Section II.)
d. Remove the engine. (Refer to Removal of Engine, Section VIII.)
e. Disconnect the two steering rods (lland4) at the nose gear horn assembly
(3) by removing the cotter pins, nuts, washers and bolts.
f. Disconnect the oil lines, vacuum lines, fuel lines, hoses and wires which
are secured to the mount with clamps and Koroseal lacing. Mark all wires and
lines for identification and reinstallation.
g. Remove the nose gear and engine mount by removing the five bolts (16)
which attach the mount to the firewall.

7-11. CLEANING, INSPECTION AND REPAIR OF NOSE LANDING GEAR.
a. Clean all parts with a suitable dry type cleaning solvent.
b. Inspect the nose gear assembly for the following:
1. Bolts, bearings and bushings for excess wear, corrosion and damage.
2. Strut housing and torque links for cracks, bends or misalignment.
c. The shimmy dampener requires no service other than routine inspection.
In case of damage or malfunction, the dampener should be replaced rather than
repaired.
d. Repair to the landing gear is limited to reconditioning of parts, such as
replacing bearings and bushings, smoothing out minor nicks and scratches, repainting of areas where paint has chipped or peeled and replacement of parts.
7-12. INSTALLATION OF NOSE LANDING GEAR. (Refer to Figure 7-2.)
a. Install the nose gear and engine mount assembly to the firewall with bolts,
washers and nuts. Torque nuts as specified in Torque Requirements, Section II
of this manual.
b. Attach the two steering rods (11 and4) to the nose gear steering horn (3)
with bolts, washers and nuts (1).

Reissued: 1/15/81

2F5

LANDING GEAR AND BRAKESYSTEM

PIPER CHEROKEE SERVICE MANUAL

1829

16

BUNGEE ASSEMBLY (1974

MODELS AND UP)
983

18
19
20

21

22

23

Figure 7-2.

Reissued: 1/15/81

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
19.
18.
17.
18.
19 .
20.
21.
22.
23.

BOLT, WASHER & NUT
CAP, SCREW
HORN ASSY.
RIGHT STEERING CONTROL ROD
ROD END BEARING
AIR VALVE CAP
AIR VALVE
BOLT
PIN, WASHER & COTTER PIN
CAP SCREW
LEFT STEERING CONTROL ROD
SHIMMY DAMPENER
BOLT, WASHER & NUT
BOLT, WASHER & NUT
NOSE GEAR STRUT ASSY.
BOLT, WASHER & NUT
LINK ASSY.
BUMPER BLOCK
PISTON TUBE ASSY.
TOW BAR BRACKET
FORK ASSY.
TIRE
AXLE ROD ASSY.

Nose Gear Installation

2F6

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

c. If removed, connect the shimmy dampener(12)to the steering horn with bolts,
washers and nuts(l4).A spacer bushing and cotter pin are required at the body attachment
point.
d. Install the engine and connect controls. (Refer to Installation of Engine, Section
VIII.)
e. Attach hoses, wires and cables to engine mount tubing, securingwith clamps and
Koroseal lacing where required.
f. Check the alignment of the nose gear per paragraph 7-12.
g. Remove the airplane from the jacks.
h. Install the propeller, (Refer to Installation of Propeller, Section VIII.) and engine
cowling.
7-13. ALIGNMENT OF NOSE GEAR. On 1974 models the nose wheel steering has been
modified by the addition of the bungee steering system. This new system will require some
different adjustment procedures which are included with the regular instructions.
a. Place the airplane on a smooth level floor that will accomodate the striking of a
chalk line.
b. Place the airplane on jacks. (Refer to Jacking, Section II.)
c. Level the airplane laterally and longitudinally. (Refer to Leveling,Section II.)
d. From the center of the tail skid, extend a plumb bob and mark the contact point on
the floor.
e. Extend a chalk line from the mark on the floor below the tail skid to a point
approximately three feet forward of the nose wheel.Allow the line to pass under the wheel
at the center line of the tire. Snap the chalk line.
f. Ascertain that the rudder is properly rigged and the rudder cable tension is correct.
(Refer to Riggingof Rudder, Section V.)
g. Clamp the rudder pedals to align in a lateral position. (Refer to Figure 7-3.)
h. Ascertain that the nose wheel is in alignment with the longitudinal axis of the
airplane or chalk line.
i. On airplanes prior to 1974 models adjust the rod end bearings of each steering
control rod to align the nose wheel with the chalk line and bring the rudder pedals into their
neutral angle fore and aft. (Refer to Table VII-I for neutral angle.) Do not attempt to make
the adjustments by means of one rod end, divide the adjustment between rod ends. Place a
bubble protractor against a pedal steering tube to check this angle.
j. On 1974 models install the steering bungee assembliesbetween the steering horn and
rudder pedals without any load on the bungees. Adjust the rod ends to obtain this no load
condition, and connect the bungees to the steering horn.
NOTE
Check that the rod ends have sufficient thread engagement,
by use of the check holes in the rods or a minimum of
three-eights of an inch thread engagement.
k. On 1974 models ascertain that the rudder pedal stops are adjusted in accordance
with instructions givenin Riggingand Adjustment of Rudder, Section V.

Reissued: 1/15/81

2F7

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

1641

SeeTable VII-1 For Rudder Pedal Neutral Angle

Figure 7-3. Clamping Rudder
Pedals in Neutral Position

Figure 7-4. Rudder Pedals
at Neutral Angle

L To check the nose gear steering for its maximum right and left travel, mark on each
side of the nose wheel an angle line from the center line and wheel pivot point. (Refer to
Table VII-I for nose wheel turning angle of the particular model being serviced.) Turn the
wheel to its maximum travel in both directions to check for allowabletravel. Should travel
be exceeded in one direction and not enough in the other direction, check for possible
damage to the gear fork or torque links,
m. When the wheel is turned to its extreme right or left travel, there should be .06 to
.12 of an inch clearance between the nose wheel steering stops. This is due to the stops on
the rudder making contact ahead of the nose gear stops. Prior to checking and/or making
this adjustment, ascertain that the rudder travel is correct per Riggingand Adjustment of
Rudder, Section V.
n. Adjust the shimmy dampener by turning the nose wheel against its stops and
adjusting the rod end of the dampener for adequate travel to both directions.
o. Remove the aircraft from jacks.
NOTE
When the nose wheel fairing is removed, centering springs
should be installed for proper nose wheel centering. Refer to
the latest revision of Piper Service Bulletin No. 291 for more
information.

Reissued: 1/15/81

2F8

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

TABLEVII-I. NOSEGEAR ALIGNMENTTOLERANCES

Rudder Pedal Neutral Angle (Aft of Vertical)
8 degrees, 15 minutes

1. PA-28-140,
Serial Nos. 28-20002 to 28-20520 incl.
2. PA-28-150,-160,-180,
SerialNos. 28-1 to 28-1760 incl.
3. PA-28-235,
Serial Nos. 28-10000 to 28-10486 incl.

11 degrees

1. PA-28-140,
Serial Nos. 28-20521to 28-7325684
2. PA-28-150. -160, -180,
Serial Nos. 28-1760to 28-7305611
3. PA-28-235.
Serial Nos. 28-10487to 28-7310187
4. PA-28R-200. Models Previous to 1974
5. PA-28R-180, Serial Nos. 28R-713001and up

14 degrees

+3

All 1974 Models and up

.-

Nose Wheel Travel
30 degreesleft,
30 degreesright

22 degreesleft,
22 degreesright

+ 1°
- 1°

1. PA-28-140,
SerialNos. 28-20002 to 28-21845 incl;
28-21847 to 28-21929 incl; 28-21931 to
28-21934 incl.
2. PA-28-150,-160,-180,
SerialNos. 28-1 to 28-3377 incl.
3. All PA-28R-200 Models
4. All 1974 Modelsand up
1. PA-28-140,
SerialNos. 28-21846, 28-21930, 28-21935
to 28-7325684
2. PA-28-150,-160,-180,
Serial Nos. 28-3378 to 28-7305611
3. PA-28-235Modelsup to SerialNo.
28-7310187

.

Revised: 10'3;'83

2F9

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

7-14. MAIN LANDINGGEAR.
7-15. DISASSEMBLYOF MAIN GEAR OLEO. (Refer to Figure 7-5 or 7-6.) The main gear
axle (19) and piston tube assembly(18) may be removed from the cylinder housing (9) with
the gear removed from or installed on the airplane. On some airplanes the metering
components of the gear that are located in the top of the housing may be removed, but only
with the gear removed from the airplane. (Refer to Paragraph 7-17 for Removal of Gear.)
a. Place the airplane on jacks. (Refer to Jacking, Section II.)
b. Place a drip pan under the main gear to catch spillage.
c. The gear axle and piston tube assembly may be removed by the following
procedure:
1. Remove the air from the oleo chamber by depressing the air valvecore pin found
in the inspection hole on top of the wing. After the pressure in the oleo chamber has
diminished, remove the valve core pin, attach a small hose to the air valve, and drain the
fluid by slowly compressing the piston tube. If it is desirable to extract more fluid from the
chamber, remove the filler plug, insert a siphon hose and drain fluid from the upper area of
the housing.
2. Disconnect the flexible brake line at the elbow on the brake assembly.
3. Disconnect the torque link assembly by removing any one of the three cotter
pins, nuts, washers and bolts. Note arrangement of the components for reinstallation.
Carefully slide the piston tube from the cylinder housing.
4. The scraper ring (15) located inside the lower end of the cylinder housing may
be removed by first removing the retainer ring (17), spacer ring (16) and then the scraper
ring.
5. The "O" ring seal (14) located just before the scraper ring may be removed by
using a curved wire or spoon shaped tool and inserting it under the ring.
d. The cylinder head, and in some airplanes the orifice assembly, may be removed by
the following procedure:
1. Cut safety wire and remove the bolts that secure the cylinder head (4) in the top
of the housing. Remove the assemblyfrom the housing.
2. If "O" ring was used with cylin4er head (4), remove and discard. If "0" ring was
not used with cylinder head (4), remove all traces of sealant from around the cylinder head
(4) and top of housing.
3. If, when removed, the cylinder head is equipped with a metering tube (6), this
indicates that the orifice assembly (8) may be removed. (Those assemblies without a
metering tube, the metering deviceis cast into the housing.)
4. The orifice assembly may be removed from within the housing by rotating it
counterclockwise out of the housing with the use of a .50 x .125 stud type spanner wrench
(Refer to Figure 7-21). Do not remove orifice unless it necessitates replacement.

Reissued: 1/15/81

2FI0

LANDINGGEAR ANDBRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

7-16. CLEANING,INSPECTIONAND REPAIR OF MAINGEAR OLEO.
a. Clean all parts with a suitable dry type cleaningsolvent.
b. Inspect the landing gear oleo components for the following:
1. Bearing surfaces of housing for excess wear, corrosion, scratches and overall
damage.
2. Retaining ing for cracks,-burrs, etc.
3. Cylinder tube for corrosion, scratches, nicks, excessivewear and misalignment.
4. Air valve for operation and general condition.
5. Orifice plate for hole restriction.
c. Repair of the oleo is limited to smoothing out minor scratches,nicks and dents, and
replacement of parts.
7-17. ASSEMBLYOF MAINGEAR OLEO. (Refer to Figure 7-5 or 7-6.)
a. Install the orifice assembly,if removed, by the followingprocedure:
1. Lubricate with hydraulic fluid (MIL-H-5606)and install an "O" ring (7) in the
annular slot in the metering orifice (8).
2. Insert the orifice through the opening in the top of the gearhousing and turn it
into the threaded hole web. Tighten the orifice with the use of a stud type spanner wrench.
3. Lubricate and install an "O" ring or apply a thin layer of Permatex
Forma-GasketNo. 6 Sealant, directly underneath the flange of the cylinder head (4).
NOTE
/({~~

~~On

models without the groove for the "O" ring, apply
Permatex Forma-Gasket#6 Sealant beneath the flangeof the
cylinder head (4).

4. Insert The tube of the metering assembly through the openingin the top of the
housing and into the orifice. Use caution not to cut or dislodge the "0" ring slot in the
orifice.
5. Secure the metering tube assembly with bolts and safety with MS20995-C32
wire..
b. Assemble the-components of the piston tube (18) on the tube by placing, in order,
the retainer ring (17), spacer ring (16) and scraper ring (15). Insert an "O" ring (14) into the
annular slot in the bottom of the housing.
c. Lubricate the wall of the piston and carefully insert it into the housing being careful
not to damage or dislocate the "0O"ring in the housing.
d. Ascertain that the bushings are installed in the upper and lower torque links and
then install links. At cable end of each link, install with the use of brake line bracket,
bearing washers, bolt, washer, nut and cotter pin. Do not over tighten causing binding or
damage to the link. At the connection point of the upper and lower links, attach with the
. use of brake line brackets, spacer washers, grease bolt, washers, nut and cotter pins. Install
washers (AN960-816L) under the head of the bolt to allow a firm sliding fit between the
two links.
e. Slide the scraper and spacer rings into place and securewith the retainer ring in the
annular slot in the bottom of the housing.

(
Reissued:1/15/81

2Fll

LANDINGGEARAND BRAKESYSTEM

INTENTIONALLY LEFT BLANK

2F12

PIPER CHEROKEE SERVICE MANUAL

1898

1.

2
1.
2.
3.
4.

CAP, VALVE
PLUG, FILLER
"O" RING
HEAD CYLINDER

3
4

5. DELETED
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.

DELETE
DELETE
ORIFICE ASSEMBLY
STRUT HOUSING
WASHER
NUT
WASHER
TORQUE LINKS
RING OR QUAD RING
"O"
RING, SCRAPER
RING, SPACER
RING, RETAINER
TUBE, PISTON
AXLE STUB
SPACER
SPACER
NUT, WHEEL RETAINER
PIN, CLEVIS

9

10

11
12

13

TORQUE LINK ASSEMBLY IS A MATCHED
NOTE: PART NO. 78033-0
SET AND THEREFORE MUST NOT BE INTERCHANGED WITH
6569
-0 TORQUE LINK ASSEMBLY.

Torque links can be installed individually
28-7225584 & up
28-140
28-7305002 & up
28-180

on Serial Nos.

Figure 7-5. Main Gear Oleo Strut Assembly; PA-28-140, -150, -160 and -180

Reissued:1/15/81

2F13

LANDINGGEAR AND BRAKESYSTEM

PIPER CHEROKEE SERVICE MANUAL

1698

SEE NOTE

Figure 7-5. Main Gear Oleo Strut Assembly; PA-28-140, -150, -160 and -180 (cont.)

Reissued: 1/15/81

2F14

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

1699

NOTE:

TORQUE LINK ASSEMBLY IS A MATCHED
PART NO. 78033-0
SET AND THEREFORE MUST NOT BE INTERCHANGED WITH
65691-0
TORQUE LINK ASSEMBLY.

Torque

links can be installed
28-7310003
28-235

Individually
& UP

on Serial

Nos.

2

12

1.
2.
3.
4.
5.
6
7.
8.
9.
10.
.
12.
13
14.
15
16.
17
17.
19
20.
21.
22
23

CAP, VALVE
PLUG, FILLER
"0"
RING
HEAD CYLINDER
DELETED
TUBE, METERING
"0"
RING
ORIFICE ASSEMBLY
SRUT HOUSING
WASHER
NUT
WASHER
TORQUE LINKS
"O" RING OR QUAD RING
RING, SCRAPER
RING SPACER
RETAINERRING
TUBE, PISTON
AXLE STUB
SPACER
SPACER
NUT, WHEEL RETAINER
PIN, CLEVIS

Figure 7-6.

Reissued: 1/15/81

/

\

Main Gear Oleo Strut Assembly,

2F15

PA-28-235

LANDINGGEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

1999

1

2
3
4

6

7
8

9

13

SEE

NOTE

Figure 7-6. Main Gear Oleo Strut Assembly, PA-28-235(cont.)

Reissued: 1/15/81

2F 16

LANDING GEAR AND BRAKE SYSTEM

INTENTIONALLY LEFT BLANK

2F17

PIPERCHEROKEESERVICEMANUAL

f.
g.
h.
i.

Install the hydraulic brake line.
If removed, install the landing gear as described in paragraph 7-19.
Service the oleo strut as given in Oleo Struts, Section II.
Actuate the gear several times by hand to be certain it operates freely.
NOTE
Links should be loose enough to allow free action of the gear.
but also resist side play. To eliminate side play shim washers
63311-03 (.005) may be used as required. Maximum side
play .005/.007.

j . Remove the drip pan and slowly lower the airplane from the jacks.
k. If necessary, bleed brakes by instructions given in paragraph 7-51.
7-18. REMOVAL OF MAIN LANDING GEAR. (Refer to Figure 7-7.)
a. Place the airplane on jacks. (Refer to Jacking, Section II.)
b. Place a drip pan under the main gear to catch spillage.
c. If desired, remove the air from the oleo chamber by depressing the air
valve core pin found in the inspection hole ontop of the wing. After the pressure
in the oleo chamber has diminished, remove the valve core pin and attach a small
hose to the air valve and drain the fluid by slowly compressing the piston tube.
If it is desirable to extract more fluid from the chamber, remove the filler plug,
insert the siphon hose and drain fluid from the upper area of the housing.
d. Remove the fairing from around the cylinder housing and the access plate
located on the bottom of the wing and to the rear of the housing by removing attaching screws.
e. Unhook the hydraulic brake line inside the wing assembly. This is accessible through the access plate. Cap the line by use of a threaded cap or wrapping
with plastic.
f. Remove the top four bolts by holding them with a slotted screwdriver and
turning the nut with the appropriate wrench. Remove the remaining six by use
of a wrench. Carefully remove the gear assembly from the wing.
7-19.. CLEANING, INSPECTION AND REPAIR OF MAIN LANDING GEAR.
a. Clean all parts with a suitable dry type cleaning solvent.
b. Inspect the gear components for excessive wear, corrosion and damage.
Check the cylinder housing and torque links for cracks, nicks and misalignment.
c. Repair of the landing gear is limited to reconditioning of parts, replacement of parts, smoothing out minor nicks and scratches and repainting areas
where paint has chipped or peeled.

Revised: 10/3/83

2F18

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

1777

,/

100

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.

SCREW
AIR VALVE CAP
BOLT
AIR VALVE
CYLINDER
BOLT
BRAKE LINE HOSE
BOLT, WASHER, NUT & COTTER PIN
OLEO ASSEMBLY
TORQUE LINK ASSEMBLY
TOROUE LINK ASSEMBLY
STUB AXLE

Figure 7-7.

Reissued: 1/15/81

Main Gear Installation

2F19

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

7-20..INSTALLATION OF MAIN LANDINGGEAR. (Refer to Figure 7-7.)
a. The main landing gear assembly may be installed on the wing by the following procedure:
1. Position the gear up in the wing through the access opening and secure
with bolts, washers and nuts.
2. Reconnect the brake line at the point of disconnection.
b. Service the oleo strut per Oleo Struts, Section II.
c. Service the brake system. (Refer to Brake System, Section II.)
d. Install the access plate to the bottom of the wing and the oleo housing fairing to the gear.
e. Slide the drip pan from under the gear and remove the airplane from the
jacks.

7-21.

WHEELS.

7-22. REMOVAL AND DISASSEMBLYOF NOSE WHEEL. (Refer to Figure 7-8.)
a. Jack the airplane enough to raise the nose wheel clear of the ground. (Refer
to Jacking, Section II.)
b. If wheel fairing is installed, remove four bolts, two on each side, and the
small plate on top held by metal screws. Slide fairing up on the gear until the
wheel is removed.
c. Remove wheel by the following procedure:
1. Remove the nut and washer from one end of the axle rod and slide out
the rod and axle plugs.
2. Lightly tap the axle tube out from the center of the wheel assembly by
use of an object of near equal diameter.
NOTE
Be certain not to damage the axle tube end in any way.
This will make removal and installation extremely
difficult.
3. Remove the spacer tubes and the wheel assembly.
4. Slide down wheel fairing and remove by turning it sideways.

Reissued: 1/15/81

2F20

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

1695

/

/
2
//

1J

as,

3

11
-I

1.
2.
3.
4.
5.
6.
7.

WHEEL HALF
WHEEL HALF
WASHER
WHEEL THROUGHBOLT
NUT
SEAL RETAINER SCREW
SNAP RING
S. SEAL RETAINERS
9. GREASE SEAL
10. BEARING CONES
II. BEARING CUP

9.

Figure 7-8.

Nose Wheel Assembly

d. The wheel halves (1 and 2) may be separated by first deflating the tire.
With the tire sufficiently deflated, remove the wheel through bolts (4). Pull the
wheel halves from the tire by removing the wheel half opposite the valve stem
first and then the other half.
e. The wheel bearing assemblies (10 and 11) maybe removed from each wheel
half by first removing the three screws (6) or snap ring (7) which hold in the
grease seal (9) and seal retainers (8), and then the bearing cones (10). The bearing cup (11) should be removed by tapping out evenly from the inside.

Reisesued: 1/15/81

2F21

LANDING GEAR AND BRAKESSYSTEM

PIPER CHEROKEE SERVICE MANUAL

7-23. INSPECTION OF NOSE WHEEL ASSEMBLY.
a. Visuallycheck all parts for cracks, distortion, defects and excess wear.
b. Check tie bolts for looseness or failure.
c. Check internal diameter of felt grease seals. Replace the felt grease seal if surface
is hard or gritty.
d. Check tire for cuts, internal bruises and deterioration.
e. Check bearing cones and cups for wear and pitting and relubricate.
f. Replace any wheel casting having visible cracks.
7-24. ASSEMBLY AND INSTALLATION OF NOSE WHEEL. (Refer to Figure 7-8.)
a. Ascertain that the bearing cup (11) for each wheel half (I and 2) is properly
installed. Install the tire with tube on the wheel half with the valve stem hole and then
join the two wheel halves. Install the through bolts (4) with the washers (3) and nuts (5) to
the valve stem side, torque nuts to 90 inch pounds and inflate tire. (Refer to TableII-I,
Section II for tire pressure.)
b. Lubricate the bearing cones (10) and install the cones and grease seal assembly(8
and 9). Secure with the same three screws(6) or snap ring (7).
c. Replace the wheel fairing by turning sideways and slipping it up over the fork
assembly.
d. Place the spacer tubes one on each side of the wheel and install unit in fork. Align
and slide the axle tube through the spacer tubes and wheel assembly. Reinstall the axle
plugs and rod with washer and nut. Tighten the nuts until no side play is felt, yet allowing
the wheel to rotate freely.
e. Turn fairing so it will fall into place and reinstall it with the four bolts and screws
in the small plate.
7-25. REMOVAL AND DISASSEMBLY OF MAIN WHEEL. (Refer to Figure 7-9.)
a. Place the airplane on jacks. (Refer to Jacking, Section II.)
b. To remove the main wheel, remove the two cap bolts that join the brake cylinder
housing and the lining back plate assemblies. Remove the back plate from between brake
disc and wheel.
c. Remove the dust cover, the cotter pin and flat head pin that safeties the wheelnut,
and the wheel nut. Slide the wheel from the axle.
d. The wheel halves (1 and 2) may be separated by first deflating the tire. With the tire
deflated, remove the wheel through bolts (16). Pull the wheel halves from the tire by
removing the inner half from the tire first, and then the outer half. The brake disc can be
removed at this time.

Revised: 10/3/83

2F22

LANDING GEAR AND
BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

1. WHEEL HALF
2. WHEEL HALF
3. BRAKE DISC
4. SCREW
5. LOCK WASHER
6. DUST SHIELD
7. RETAINER RINGS
8. NUT
9. WASHER
10. BEARING CUP

/l
/'

I

·

13

18

11.
12.
13.
14.
15.
I5.
16.
17.
18.
19.
20.

BEARING CONE
RETAINER RINGS
GREASE SEAL
RETAINER RINGS
SEAL RETAINER SCREW
WHEEL THROUGH BOLT
SNAP RING
GREASE SEAL RETAINER
GREASE SEAL
GREASE SEAL RETAINER

Figure 7-9.

Main Wheel Assembly

e. The wheel bearing assemblies may be removed from each wheel half
first removing the retainer rings (7 or 12) or snap rings (17) that secure
grease seal retainers (18 or 20), and then the retainers, grease seals (13 or
and bearing cone (II). The bearing cups (10) should not be removed only
replacement and may be removed by tapping out evenly from the inside.

by
the
19)
for

7-26. INSPECTION OF MAIN WHEEL ASSEMBLY.
a. Visually check all parts for cracks, distortion, defects and excess wear.
b. Check tie bolts for looseness or failure.
c. Check internal diameter of felt grease seals. Replace the felt grease seal
if surface is hard or gritty.

Reissued: 1/15/81

2F23

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

d. Check tire for cuts, internal bruises and deterioration.
e. Check bearing cones and cups for wear and pitting and relubricate.
f. Replace any wheel casting having visible cracks.
7-27. ASSEMBLY AND INSTALLATION OF MAIN WHEEL. (Refer to Figure 7-9.)
a. Ascertain that the bearing cup (10) for each wheel is properly installed. Install
the tire with tube on the outer wheel half and then join the two wheel halves. Position the
brake disc (3) in the inner wheel half and install the through bolts with the nuts on the
valve stem side. Torque wheel nuts to 150 inch,pounds and inflate tire. (Refer to Table 11-1.
Section II for tire pressure.)
b. Lubricate the bearing cones (I ) and install the cones, grease seals (13 and 19) and
seal retainer rings (18 or 20). Secure with retainer rings (14) or snap ring (17).
c. Slide the wheel on the axle and secure with retainer nut. Tighten the nut to allow
no side play. yet allow the wheel to rotate freely. Safety the nut with a flat head pin. washer
and cotter pin. Reinstall the dust cover.
d. Position the brake lining back plates between the wheel and brake disc and the
brake cylinder on the torque plate. Insert the spacer blocks between the back plates and
cylinder, and install the four bolts to secure the assembly.If the brake line was disconnected.
reconnect the line and bleed the brakes per paragraph 7-52.
7-28. BRAKE SYSTEM.
7-29. WHEEL BRAKE ASSEMBLY.
7-30. BRAKE ADJUSTMENT AND LINING TOLERANCE. No adjustment of the
brake lining clearance is necessary as they are self-adjusting. Inspection of the lining is
necessary, and it may be inspected visually while installed on the airplane. The linings are
of the riveted type and should be replaced if the thickness of any one segment becomes
worn below .099 of an inch or unevenly worn.

Revised: 10/3/83

2F24

LANDING GEAR AND
BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

C342

18

1. BOLT
2. WASHER
3. NUT
4. WASHER
5. BRAKE CYLINDER
6. BLEEDER CAP
7. BLEEDER SCREW
8.
BLEEDER SEAT
9. RIVET
10. "O"
RING
11. PISTON
12. PRESSURE PLATE
13. LINING
14. LINING
15. BACK PLATE
16. SHIM
17. ANCHOR BOLT
18. TORQUE PLATE

2-

4

Figure 7-10.

Wheel Brake Assembly

7-31. REMOVAL AND DISASSEMBLYOF WHEEL BRAKE ASSEMBLY. (Refer
to Figure 7-10.)
a. To remove the brake assembly, first disconnect the brake line from the
brake cylinder at the tube fitting.
b. Remove the two cap bolts that jointhe brake cylinder housing and the lining
back plate assembly. Remove the back plate from between the brake disc and
wheel.
c. Slide the brake cylinder housing from the torque plate.
d. Remove the pressure plate by sliding it off the anchor bolts of the housing.
e. The piston may be removed by injecting low air pressure in the cylinder
fluid inlet and forcing the piston from the housing.

Reissued: 1/15/81

2G1

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

f. Check Anchor Bolt for wear.
g. Remove anchor bolt by the following procedure.
1. Position cylinder assembly on a holding fixture. (Refer to Figure 7-11.)
2. Use a suitable arbor press to remove the anchor bolt from the cylinder body.

923

PRESS

CYLINDER
BODY

Figure 7-11. Removal of Anchor Bolt

2G2

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

h. Install Anchor Bolt by the following procedure.
1. Support Anchor Bolt in a holding fixture. (Refer to Figure 7-12. Step A.)
2. Align cylinder body over anchor bolt. (Refer to Figure 7-12. Step B.)
3. Use a suitable arbor press and apply pressure on the spot face directly over the
anchor bolt hole. (Refer to Figure 7-12. Step C).

A122

ANCHOR
BOLT
HOLDING
FIXTURE

STEP A

CYLINDER
BODY
HOLDING
FIXTURE

STEP B
PRESS
CYLINDER
BODY
HOLDING
FIXTURE

STEP C
Figure 7-12. Installation of Anchor Bolt

Revised: 10/'3/83

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LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

7-32. CLEANING,INSPECTIONAND REPAIR OF WHEEL BRAKEASSEMBLIES.
a. Clean the assembly with a suitable solvent and dry thoroughly.
b. Check the wall of the cylinder housing and piston for scratches, burrs, corrosion,
etc., that may damage "O" rings.
c. Check the general condition of the brake bleeder screw and lines.
d. Check the brake disc for grooves, scratches or pits. Minimum service thickness of
Disc 164-5used on Wheel Assembly 40-28 is .157. Minimum dimension for Disc 164-9used
on Wheel Assembly 40-58 is .227. Minimum thickness of Disc 164-20 used on Wheel
Assembly 40-86B is .205. (Refer to Figure 7-13.) A single groove or isolated grooves up to
.031 of an inch deep would not necessitate replacement. but a grooving of the entire surface
would reduce lining life and should be replaced. Should it be necessary to remove the wheel
disc. refer to paragraph 7-25.
e. Lining may be removed from the backing plates by drilling or punching out the old
rivets, and installing a new set using the proper rivets and a rivet set that will properly stake
the lining and form a correct flare of the rivet. (A rivet setting kit is availablethrough Piper
Dealers under part number 754 165.)
7-33; ASSEMBLY AND INSTALLATION OF WHEEL BRAKE ASSEMBLY. (Refer to
Figure 7-10.)
a. Lubricate the piston "O" ring with fluid MIL-H-5606and install on piston. Slide the
piston in cylinder housing until flush with surface of housing.
b. Slide the lining pressure plate onto the anchor bolts of the housing.
c. Slide the cylinder housing assemblyon the torque plate of the gear.
d. Position the lining back plate between the wheel and brake disc. Install the two bolts
to secure the assembly.
e. Connect the brake line to the brake cylinder housing.
f. Bleed the brake system as described in paragraph 7-52.
7-34. BRAKEMASTER CYLINDER. (Hand Parking Brake.)
7-35. REMOVAL OF BRAKE MASTER CYLINDER. (Hand Brake.) (Refer to Figure
7-14.)
a. To remove the brake master cylinder (8), first disconnect the inlet supply line (13)
from the fitting at the top of the cylinder and allow fluid to drain from the reservoir and
line into a suitable container.
b. Disconnect the pressure line from the fitting on the cylinder and allow fluid to drain
from the cylinder line.
c. Disconnect the end of the cylinder rod from the brake handle (6) by removingthe
cotter pin that safeties the connecting clevis pin (12). Remove the clevis pin and spacer
washers.
d. Disconnect the base of the cylinder from its mounting bracket by removing the
attaching bolt assembly (11).

Revised: 10/3/83

2G4

LANDINGGEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

C343

MINIMUMTHICKNESS

-

-

!,,

MINIMUM
THICKNESS

WHEEL
ASSEMBLIES

.157
.227
.205

40-28
40-58
40-86

MEASURE2 OR 3 POINTSTO GET AVERAGE
DISC THICK NESS

MM

Figure 7-13. Brake Disc Minimum Thickness

1786

.

1.
2.
3.
4.

BRAKE RESERVOIR
RIGHT BRAKE AND RUDDER PEDAL
LEFT BRAKE AND RUDDER PEDAL
RIGHT BRAKE CYLINDER
5.
LEFT BRAKE CYLINDER
6. BRAKE HANDLE
7. HANDLE RELEASE BUTTON
8.
MASTER CYLINDER ASSEMBLY
9. TORQUE TUBE
10. RUDDER PEDAL PADS
II.
BOLT ASSEMBLY
12. CLIVIS PIN
13. LINE, INLET

I,

Figure 7-14. Brake System Installation

Revised: 10/3/83

2G5

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

e. The handle assembly may be removed by removing the attaching bolt assembly that
secures the handle to its mounting bracket.
7-36. DISASSEMBLYOF BRAKEMASTERCYLINDER.
a. PA-28-150.-160. Serial Nos. 28-1 to 28-250 incl. (Refer to Figure 7-15.)
1. Remove the cylinder from its mounting bracket as per Paragraph 7-35.
2. To disassemble the cylinder, first remove the piston rod assembly by removing
the retainer ring (2) from the annular slot at the rod end of the cylinder. Draw the piston
rod assembly from the cylinder. Remove the spring (13) from the cylinder.
3. The piston rod assembly may be disassembled by first removing the clevis end
from the piston rod (6) and then slidingoff the brake cylinder cap (3).
4. Remove the roll pin (8) from the bushing (7) thus releasingthe piston head and
O-rings (9 and 11).
b. PA-28-140. Serial Nos. 28-20002 to 28-21036 incl: PA-28-150. -160. -180 Serial
Nos. 28-251 to 28-2700 incl: PA-28-235. Serial Nos. 28-10003 to 28-10679 incl. (Refer to
Figure 7-16.)
1. Remove the cylinder from the airplane per Paragraph 7-35.
2. Cut the safety wire and remove screw (10) that secures the plug (1) in the end of
the cylinder (9).
3. Remove the plug (1) and piston assembly from the cylinder by pulling the
cylinder actuator shaft (4) from the cylinder.
4. Remove the spring(8) from within the cylinder.
5. Remove the roll pin (7) from the cylinder actuator piston (5) and pull off the
piston.
c. PA-28-140. Serial Nos. 28-21037and up: PA-28-150.-160. -180. Serial Nos. 28-2701
and up: PA-28-235. Serial Nos. 28-10698 and up. (Refer to Figure 7-17.)
1. Remove the cylinder from its mounting bracket as per Paragraph 7-35.
2. To disassemble the cylinder, first remove the piston rod assembly by removing
the snap ring (11) from the annular slot at the rod end of the cylinder. Draw the piston rod
assembly from the cylinder.
3. The piston rod assembly may be disassembled by first removing the small snap
ring (2) securing the retainer bushing (3), spring (4), piston (6), seal (7), gland (9), and, if
desired, the large retainer spring (13).
4. Remove the O-ringsfrom the piston and gland.

Revised: 10/3/83

2G 6

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

7-37. CLEANING, INSPECTIONAND REPAIR OF BRAKE MASTERCYLINDER.(All.)
a. Clean the cylinder parts with a suitable solvent and dry thoroughly.
b. Inspect the interior walls of the cylinder for scratches, burrs, corrosion, etc.
c. Inspect the general condition of the fitting threads of the cylinder.
d. Check the piston for scratches, burrs, corrosion, etc.
e. Repairs to the cylinder are limited to polishing out small scratches, burrs, etc. and
O-rings.

7-38. ASSEMBLYOF BRAKE MASTERCYLINDER.
a. PA-28-150. -160. Serial Nos. 28-1 to 28-250 incl. (Refer to Figure 7-15.)
NOTE
Use a small amount of hydraulic fluid (MIL-H-5606)on the
O-rings and component parts to prevent damage and ease of
handling during reassembly.
1. Install new O-rings (4 and 5) on the inside and outside of the brake cylinder cap
(3).
2. Install new O-ring(10) on the piston head (11) and slide onto the guide pin (12).
3. Slide the O-ring(9) onto the small end of the guide pin.
4. Fit the guide pin with piston head into the end of the piston plunger rod (6).
Slide the bushing (7) onto the plunger rod and align the holes through the bushing, rod and
pins. Install the roll pins (8).
5. Install the large spring (13) onto the pin and carefully slide the assemblyinto the
cylinder housing.
6. Slide the brake cylinder cap assembly onto the plunger rod and install the
retainer ring (2) into the annular groove provided.
7. Replace the clevisend and jam nut on the end of the piston arm.
8. Fully extend the cylinder and check the extended length. The extension length
from the center line of attachment holes should be 10. 125 + .125 inches. Should
adjustment be needed, rotate the clevisend and set jam nut.
9. Install the cylinder per Paragraph7-38. -

Revised: 10/3/83

2G7

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

A601

REFERTO FIGURE7-18

1. CYLINDER
2. RETAINERRING
3. BRAKECYLINDERCAP
4. "O" RING
5. "O" RING
6. ROD
7. BUSHING
8. ROLLPIN
9. "0" RING
10. "O" RING
11. PISTONHEAD
12. PIN
13. SPRING
14. PARKINGVALVE

Figure 7-15. Brake Master Cylinder (Hand Brake)
PA-28-150, -160, Serial Nos. 28-1 to 28-250 incl.
1. CYLINDERACTUATORPLUG
A600
2. "0" RING
3. "0" RING
4. CYLINDERACTUATORSHAFT
5. CYLINDERACTUATORPISTON
6. PISTON
7. ROLLPIN
8. SPRING
9. CYLINDER
10. SCREW

9

Figure 7-16. Brake Master Cylinder (Hand/Parking Brake)
PA-28-140, Serial Nos. 28-20002 to 28-21036 incl;
PA-28-150, -160,-180, Serial Nos. 28-251 to 28-2700 incl;
PA-28-235, Serial Nos. 28-10003 to 28-10697 incl.

Revised: 10/3;83

2G8

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

A349
889

COUNTER BORE
.562 DIA. .0625 DEEP

12

13

14

15

.75

1
2
3
4
5.

HOUSING
SNAP RING
BUSHING. RETAINER
SPRING
O-RING

6
7
8.
9.
10.

PISTON
DYNA SEAL
O-RING
GLAND PACKING
O-RING

11 SNAP RING
12 ROD. PISTON
13 SPRING. RETAINING
14. ROLL PIN
15 WASHER

Figure 7-17. Brake Master Cylinder. (Hand/Parking Brake)
PA-28-140, Serial Nos. 28-21037and up;
PA-28-150, -160, -180, Serial Nos. 28-2701 and up;
PA-28-235, Serial Nos. 28-10698and up
b. PA-28-140. Serial Nos. 28-20002 to 28-21037; PA-28-150, -160, -180, Serial Nos. 28-251 to
28-2700 inch PA-28-235, Serial Nos. 28-10003to 28-10697incl. (Refer to Figure 7-16.)
NOTE
Use a small amount of hydraulic fluid (MIL-H-5606) on the "0"
rings and component parts to prevent damage and ease of handling
during reassembly.
1.
2.

Install the new "0" rings (2 and 3) on the cylinder plug (1).
Install the cylinder actuator piston (5) on the actuator shaft (4) and secure with the roll

pin (7).
3. Install a new "0" ring (6) on the actuator pin.
4. Place the spring (8) into the cylinder housing, and carefully slide the actuator and shaft
assembly into the housing.

Revised: 10/3/83

2G9

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

5. Install the plug assembly(1)on the shaft and install the screw through the housing.
6. Safety the screw with MS20995-C40 wire.
7. -Install the cylinder per Paragraph 7-38.
c. PA-28-140. Serial Nos. 28-21037 and up: PA-28-150. -160. -180. Serial Nos. 2828-2701and up: PA-28-235. Serial Nos. 28-10698and up. (Refer to Figure 7-17.)
NOTE
Use a small amount of hydraulic fluid (MIL-H-5606) on the
"0" ring and component parts to prevent damage and ease of
handling during reassembly.

1. Install new "O" ring on the inside and outside of the packing gland (9) and on
the outside of the piston (6). (When installingteflon "O" ring (5) on piston, it is recommended
that it be installed with the use of a cone placed against the piston. The cone may be constructed of plastic or metal with dimensions shown in Figure 7-17.)
2. To assemble the piston rod assembly, install on the rod (12), in order, the roll
pins (14), return spring retainer washer (15), retaining spring (13), packing gland (9) with
"0" rings (10), seal (7), piston (6) with "0" ring, spring (4) and retainer bushing (3). Secure
these pieces with snap ring (2) on the end of the rod.
3. Insert the piston rod assembly in the housing (1) and secure packing gland with
snap ring ( 1).
4. Install the cylinder per Paragraph 7-39.
7-39. INSTALLATION OF BRAKE MASTER CYLINDER. (Hand Brake.) (Refer
to Figure 7-14.)
a. Install the brake handle assembly between its mounting bracket and secure with
bolt, washers, nut and cotter pin. Washers should be placed on each side of the handle,
between the bracket, and under the nut.
b. Place the cylinder (8) between the mounting bracket and secure the base end with
bolt, washers, nut and cotter pin. This, too, should have washers placed on each side of the
cylinder and under the nut.
c. Connect the rod end of the cylinder to the brake handle with a clevis pin and thin
washers.Safety the cleviswith a cotter pin.
d. Connect the pressure line to the fitting at the bottom of the cylinder.
e. Connect the inlet supply line (13) to the fitting at the top of the cylinder and secure
with spring clamp.
f. Bleed the brake system per Paragraph 7-51.

Revised: 10/3/83

2G10

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

7-40.

PARKING VALVE.

(PA-28-150,

-160, Serial Nos. 28-1 to 28-250 incl.)
PARKING
OF
7-41. REMOVAL
VALVE.
a. Remove the brake master cylinder as given in paragraph

7-35.

b. Remove the parking valve from
the cylinder by turning the elbow from
END FITTING
2.
3.
4.

the cylinder

housing.

RING
"0"
RING
RING. STOP

7-42. DISASSEMBLY OF PARKING
VALVE. (Refer to Figure 7-18. )
Figure 7-18. Parking Valve
a. Remove the end fitting (1) from
PA-28-150, -160
the valve body (5).
b. Pushthe piston(6)out through the
Serial Nos. 28-1 to 28-250 incl.
body. Ascertainthat the endof the piston that connects to the link is free from damage or burrs that could- cause the
body piston wall to become scratched or galled as the piston is pushed through.
c. Remove "O" ring packings from the end fitting and piston.
5.
6.

BODY

PISTON

7-43. CLEANING, INSPECTION AND REPAIR OF PARKING VALVE.
a. Clean the valve-components in a suitable dry type cleaning solvent.
b. Inspect the valve for the following:
1. Check that the friction surfaces of the valve body and stem are free
from nicks, dents and burrs.
2. Check that the stop on the piston is secure and undamaged.
3. Check that the threaded surfaces of the body and end fitting are not
stripped or cross-threaded.
c. Repair to the valve is limited to reconditioning of parts, such as smoothing
out minor nicks and scratches, and the replacement of "O" ring packings.
7-44. ASSEMBLY OF PARKING VALVE. (Refer to Figure 7-18. )
a. Install "O" ring packings (3) on the piston (6) and install piston in the valve
body (5). Lubricate "O" rings with hydraulic fluid before installing piston.
b. Install "O" ring packing (2) on end fitting (1) and install end fitting in the
valve body.

Revised: 1013/83

2Gll

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

1.
2.
3.
4.
5.
6.
7.
8.

SPRING CLIP
TOE BRAKE PEDAL
ARM, TRIM CONTROL ATTACHMENT
CLEVIS PIN, WASHER & COTTER PIN
CLEVIS ASSEMBLY
CLEVIS PIN
ARM, IDLER
JAM NUT
16

1884

9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.

CLEVIS PIN, WASHER & COTTER PIN
CLEVIS PIN, WASHER & COTTER PIN
SPRING, RETURN
BRACKET
BRACE ASSEMBLY
CYLINDER ASSEMBLY, HYDRAULIC
TUBE ASSEMBLY, LEFT
CLEVIS PIN & COTTER PIN
HOSE ASSEMBLY - FLEXIBLE
TUBE ASSEMBLY, RIGHT
PEDAL PADS

Figure 7-19. Toe Brake Installation

Reissued: 1/15/81

2G12

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL
7-45. INSTALLATION OF PARKING VALVE.
a. Install the parking valve onto the cylinder housing by turning the elbow into the
threaded housing.
b. Install the brake master cylinder as given in Paragraph 7-39.
7-46. BRAKE CYLINDER. (Toe Brake.)
7-47. REMOVAL OF BRAKE CYLINDER. (Refer to Figure 7-19.)
a. Disconnect the upper and lower lines from the cylinder (14) to be removed and cap
the lines to prevent fluid leakage or drain the fluid from the brake reservoir and master
cylinder.
b. Remove the cylinder from its attachment fittings by first removing cotter pins that
safety the cylinder attaching pins (4 and 16)and then removing the pins.
7-48. DISASSEMBLY OF BRAKE CYLINDER.
a. Cleveland cylinder number 10-20.(Refer to Figure 7-20.)
1. Remove the cylinder from its mounting bracket as per Paragraph 7-47.
2. To disassemble the cylinder, first remove the piston rod assembly by unscrewing
the packing gland (9) from the cylinder.
3. The piston rod assembly may be disassembled by first removing the small snap
ring (2) securingthe retainer bushing (3) and then removing the bushing, spring (4),piston (5),
seal (7), gland (9), and, if desired, the large return spring.
4. Remove the O-rings from the piston and packing gland.
b. Cleveland cylinder number 10-27. (Refer to Figure 7-20.)
1. Remove the cylinder from its mounting bracket per Paragraph 7-47.
2. To disassemble the cylinder, first remove the piston rod assembly by removingthe
snap ring (10)from the annular slot in the cylinder housing (1). Draw the piston rod assembly
from the cylinder.
3. The piston rod assembly may be disassembledby first removing the roll pin (12)
and then the piston assembly (3), seal (5), packing gland (7).
4. Remove the O-rings from the piston and packing gland.
c. Cleveland cylinder number 10-30.(Refer to Figure 7-21.)
1. Remove the cylinder from its mounting bracket per Paragraph 7-47.
2. To disassemblethe cylinder, first remove the piston rod assemblyby removing the
reta ning ring from the annular slot in the cylinder housing (1). Draw the piston rod assembly
from the cylinder.
3. The piston rod assembly may be disassembled by first removing the retaining
ing (2), sleeve(3), spring (4), and then the piston assembly, O-ring (5), and gland (8), and, if
desired, the return spring (13).
4. Remove the O-rings from the piston and packing gland.
d. Gar-Kenyon cylinder number 17000.(Refer to Figure 7-20.)
1. Remove the cylinder from its mounting bracket as per Paragraph 7-47.
2. To disassemble the cylinder, first remove the piston rod assembly by unscrewing
the fitting (8) from the cylinder.
3. The piston rod assembly may be disassembled by first removing the retaining
ring (2) securingthe sleeve(3) and then removing the spring (4), piston (6), seal (7), fitting (8),
and, if desired, the large return spring (11).
4. Remove the O-rings from the piston and fitting.

Revised: 10/3/83

2G13

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

C344

14
4

13
12

11

10-20

10-27

17000

14

12

11

12

3

10

10

8

8
7

7

1. HYDRAULIC
CYLINDER
2. SNAP RING
3. BUSHING
4. SPRING
5. PISTON
6. "0" RING
7. DYNA-SEAL
WASHER
8. "O" RING
9. PACKING GLAND
10. "O" RING
11. PISTON ROD
12. SPRING
13. DELETED
14. WASHER
15. ROLL PIN

4

6

.5

1. HYDRAULIC
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.

CYLINDER
SPRING
PISTON
"O" RING
SEAL WASHER
"O" RING
PACKING GLAND
"O" RING
WIPER WASHER
RETAINING
RING
SPRING
ROLL PIN
PISTON ROD
WASHER
ROLL PIN

3

2

1

1.
2.
3.
4.
5.
6..
7.
8.
9.
10.
11.
12.
13.
14.

HOUSING
RETAINING
RING
SLEEVE
SPRING
"O" RING
PISTON
SEAL
FITTING
"O" RING
"O" RING
SPRING
PISTON ROD
WASHER
ROLL PIN

Figure 7-20. Brake Cylinder (Toe Brake)
7-49. CLEANING, INSPECTION AND REPAIR OF BRAKE CYLINDER.
a. Clean the cylinder parts with a suitable solvent and dry thoroughly.
b. Inspect the interior walls of the cylinder for scratches, burrs, corrosion,
etc.
c. Inspect the general condition of the fitting threads of the cylinder.
d. Check the piston and valve for scratches, burrs, corrosion, etc.
e. Repairs to the cylinder are limited to polishing out small scratches, burrs,
etc. and replacing valve, washer, seal, and "O" rings.

Reissued:1/15/81

2G14

LANDING GEAR AND BRAKESYSTEM

PIPER CHEROKEE SERVICE MANUAL

C343

I

10-30

2637

1.
2.
3.
4.

HOUSING
RETAINING
SLEEVE
SPRING

RING

5.
6.
7.
8.

9.
10.
11.
12.

O-RING
PISTON
O-RING
GLAND

O-RING
O-RING
WASHER WIPER
ROD

13. SPRING
14. WASHER
15. ROLL PIN

Figure 7-21. Brake Cylinder (10-30) (Toe Brake)

I

THIS SPACE INTENTIONALLY LEFT BLANK

Revised: 10/3/83

2G15

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

7-50. ASSEMBLYOF BRAKE CYLINDER.
a. Cleveland cylinder number 10-20. (Refer to Figure 7-20.)
NOTE
Use a small amount of hydraulic fluid (MIL-H-5606)on the
"O" ring and component parts to prevent damage and ease of
handling during reassembly.
1. Install new "O" rings on the inside and outside of the packing gland (9) and on
the outside of the piston (5).
2. To assemble the piston rod assembly, install on the rod (11), in order, the roll
pin (15), return spring retainer washer (14), return spring (12), packing gland (9) with "O"
rings, seal (7), piston (5) with "0" ring, spring (4) and retainer bushing (3). Secure these
pieces with the small ring (2) on the end ofthe rod.
3. Insert the piston rod assembly in the cylinder (1) and secure packing (9).
4. Install the cylinder per paragraph 7-51.
b. Cleveland cylinder number 10-27. (Refer to Figure 7-20.)
1. Install new "0" rings on the inside and outside of the packing gland (7) and on
the outside of the piston (3). (Refer to above note.)
2. To assemble the piston rod assembly, install on the rod (13), in order, the roll
pin (15), washer (14), spring (11), washer (9), packing gland (7), seal (5), piston assembly
(3) and spring (2).
3. Insert the piston rod assembly in the cylinder (1) and secure with the snap ring
(10).
4. Install the cylinder per paragraph 7-51.
c. Cleveland cylinder number 10-30. (Refer to Figure 7-21.)
1. Install new O-rings on the inside and outside of the packing gland (7) and on the
outside of the piston (3).
2. To assemble the piston rod assembly, install on the rod (12), in order, the roll pin
(14), washer (13), spring (11), washer (9), packing gland (7) with O-rings, seal (5), piston
assembly (3) with O-ring, spring (2), and roll pin (15).
3. Insert the piston rod assembly in the cylinder (1) and secure with the retaining
ring (10).
4. Install the cylinder per paragraph 7-51.
d. Gar-Kenyon cylinder number 17000.(Refer to Figure 7-20.)
1. Install new O-rings on the inside and outside of the fitting (8) and on the outside
of the piston (6). (Refer to above note.)
2. To assemble the piston rod assembly; install on the rod (12), in order, the roll
pin (14), return spring retainer washer (13), return spring ( 11), fitting (8)with O-rings, seal(7),
piston (6) with O-ring, spring (4) and sleeve(3). Secure these pieces with the retaining ring (2)
on the end of the rod.
3. Insert the piston rod assembly in the cylinder (1) and secure fitting (8).
4. Install the cylinder per paragraph 7-51.

Reissued: 1/15/81

2G16

LANDINGGEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

7-51. INSTALLATION OF BRAKE CYLINDER. (Refer to Figure 7-19.)
a. Position the cylinder (14) at its mounting points and attach with clevispins. Safety
the pins with cotter pins.
b. Connect the brake lines to the cylinder fittings.
c. Bleed the brakes per paragraph 7-52.
7-52. BLEEDINGBRAKES.
7-53. BRAKE BLEEDING PROCEDURE (Gravity). (Refer to Figure 7-22.)
a. Attach a clean, clear plastic tube to the brake bleeder of the right landing gear.
Extend the free end of the tube to a container partially filled with hydraulic fluid
(MIL-H-5606). Determine that the end of the tube is submerged in the fluid. Open the
bleeder 1/2 to 1 turn.
b. Fill the brake fluid reservoir located on the firewall with hydraulic fluid.
c. Check to determine the right hand toe brake pedal(s) in the cockpit have been
pulled full aft.
d. Pull the hand brake handle and slowly pump the master cylinder approximately 50
times or until hydraulic fluid is observed passing through the plastic tube at the brake
bleeder.
NOTE
Fluid level in the reservoir must be maintained to prevent air
from entering the system.
e. Pump right brake cylinder very slowly approximately 12 times. This will purge air
from the toe brake cylinder system. Watch for any air forced through the clear plastic tube
during this operation to insure air has been forced from the toe brake system.
f. Pump the hand brake an additional 25 times or until no air is observed through the
clear plastic tube.
g. Tighten brake bleeder and remove the plastic tube.
h. Repeat steps a through f to the left main landing gear.
7-54. BRAKE BLEEDING PROCEDURE (Pressure). (Refer to Figure 7-23.)
a. Place a clean, clear plastic tube on the vent fitting on top of the brake fluid
reservoir. Extend the free end of the tube to a container partially filled with hydraulic fluid
(MIL-H-5606).Be certain the end of the tube is submerged in the fluid.
b. Attach another clear plastic tube to the brake bleeder of the right landing gear.
Connect the free end of this tube to the pressure source. Open the bleeder 1 to 2 turns and
pressure fill the system with fluid.
c. With fluid continually flowing through the system, SLOWLYand simultaneously
actuate the hand brake and toe brake pedal, of the side being bled, several times to purge
the cylinders of air. On dual brake installations, both pedals for the brake being bled must
be actuated.

Reissued: 1/15/81

2G17

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

NOTE
By watching the fluid pass through the plastic hose at the fluid
reservoir and the bleeder fitting on the gear beingbled, it can be
determined whether any air is left in the system. If air bubbles
are evident, filling of the system shall be continued until all the
air is out of the system and a steady flow of fluid is obtained.
Should the brake handle remain spongy,it may be necessaryto
disconnect the bottom of the
1756

Figure 7-22. Bleeding Brake (Gravity)

Reissued: 1/15/81

1756

Figure 7-23. Bleeding Brake (Pressure)

2G18

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

toe brake cylinders (next to the pedal) and rotating the
cylinder horizontally or even above horizontal and by use of
the hand brake alone, purge the air from the system.
d. Close the open bleeder fitting to which the pressure hose is attached. Do not remove
the tube from the fluid reservoir until both brakes have been bled. Check the brakes on the
side being bled for proper pedal pressure. Replace cap on bleeder fitting.
NOTE
It may be necessary to remove any trapped air in the top of
the wheel brake unit by applying pressure to the system with
the brake hand lever and slowly opening the bleeder and
release the hand lever.
e. Repeat steps b through d to the left main landing gear.
f. Drain excess fluid from the reservoirto fluid level with a syringe.
7-55. BRAKE SYSTEMLEAK CHECK. Pull for a good, firm hand brake and lock parking
brake mechanism. Allow system to stand for approximately 10 minutes, then -by gripping
the park brake handle it should not be able to be pulled aft further than the original set.
Should the handle be able to be pulled towards the panel and feel spongy, a leak is present
at some point in the system. This leak may appear at any one of the connections throughout
the system or internally in the master brake cylinder or wheel brake assemblies.
7-56. BLEEDINGOF THE BRAKESAFTER A UNIT HAS BEEN CHANGED.
a. Actuate the hand brake handle until some pressure builds up in the system. At this
time, crack the attaching B nuts at any of the hose connections of the replacedunit. Most of
the handle sponge feeling should be displaced by this action.
b. Actuate the master cylinder and the toe brake cylinder of the side unit was changed
and bleed fluid through the brake assemblyon the wheel by pumping pressure and cracking
bleeder until pressure drops.
CAUTION
Do not allow pressure to bleed off before closingbleeders,
for this will allow air to enter the system. Repeat the
pumping and bleeding approximately 10 or more times or
until all the air is released from the system. During all
bleeding, fluid level of the reservoirmust be maintained.

Reissued: 1/15/81

2G19

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

TABLE VIL-II.. LANDING GEAR TROUBLESHOOTING
Trouble
Nose landing gear
shimmies during fast
taxi, take-off, or
landing.

Excessive or uneven
wear on nose tire

Nose gear fails to
steer properly.

Cause

Remedy

Internal wear in
shimmy dampener.

Replace shimmy
dampener.

Shimmy dampener or
bracket loose at
mounting.

Replace necessary
parts and bolts.

Tire out of balance.

Check balance and replace tire if necessary.

Worn or loose wheel
bearings.

Replace and/or adjust
wheel bearings.

Worn torque link bolts
and/or bushings.

Replace bolts and/or
bushings.

Incorrect operating
pressure.

Inflate tire to correct
pressure.

Wear resulting from
shimmy.

Refer to proceedings
for correction.

Oleo cylinder binding
in strut housing.

Lubricate strut housing
(Refer to Lubrication
Chart).
Cylinder and/or strut
housing bushings
damaged.

Reissued: 1/15/81

2G20

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

TABLE VII-II.
Trouble
Nose gear fails to
steer properly (cont).

Main landing shimmies
during fast taxi, takeoff, or landing.

Excessive or uneven
wear on main tires.

Reissued: 1/15/81

LANDING GEAR TROUBLESHOOTING (cont)
Cause

Remedy

One brake dragging.

Determine cause and
correct.

Steering bellcrank loose
on attachment plate.

Readjust and tighten.

Steering bellcrank bearing and/or bolt worn.

Replace bearing and/or
bolt.

Shimmy dampener
galling or binding.

Replace.

Tire out of balance.

Check balance and replace tire if necessary.

Worn or loose wheel
bearings.

Replace and/or adjust
wheel bearings.

Worn torque link bolts
and/or bushings.

Replace bolts and/or
bushings.

Incorrect operating
pressure.

Inflate tire to correct
pressure.

Wheel out of alignment
(toe in or out).

Check wheel alignment.

2G21

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

TABLE VII-II.
Trouble
Strut bottoms on
normal landing or
taxiing on rough
ground

Reissued: 1/15/81

LANDING GEAR TROUBLESHOOTING (cont)
Remedy

Cause
Insufficient air and/or
fluid in strut.

Service strut with air
and/or fluid.

Defective internal parts
in strut.

Replace defective parts.

2G22

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

I

I

MATERIAL:STEEL

Figure 7-24. Orifice Replacement Tool

Reissued: 1/15/81

2G23

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

904

WELD

HANDLE .50 DIA.

4.00

.125

3
7.50

Figure 7-25. Retainer Ring Tool

Reissued: 1/15/81

2G

24

LANDINGGEAR AND BRAKESYSTEM

SECTION VIIA
LANDING GEAR AND BRAKE SYSTEM
(PA-28R)
Aerofiche
Grid No.

Paragraph
7A- .
7A-2.
7A-3.
7A-4.
7A-5.

7A-19.

Introduction ...............................................
Description ...............................................
Troubleshooting ..........................
Landing Gear System .........................................
Nose Landing Gear ...........................................
7A-6.
Disassembly of Nose Gear Oleo .......................
7A-7.
Cleaning, Inspection and Repair of Nose Gear Oleo ......
7A-8.
Assembly of Nose Gear Oleo ...........................
7A-9.
Removal of Nose Landing Gear ......................
.
7A-10. Cleaning, Inspection.and Repair of Nose Landing
Gear.............................................
7A-11. Installation of Nose Landing Gear .....................
7A-12. Adjustment of Nose Landing Gear (Without
Gear Up Stop) ..................................
7A-13. Adjustment of Nose Landing Gear (With Gear
Up Stop) .......................................
7A-14. Alignment of Nose Landing Gear ......................
7A-15. Removal of Nose Gear Door Assembly .................
7A-16. Cleaning, Inspection and Repair of Nose Gear
Door Assembly..................................
7A-17. Installation of Nose Gear Door Assembly ...............
7A-18. Adjustment of Nose Gear Doors .......................
Main Landing Gear System.... ...............................
7A-20. Disassembly of Main Gear Oleo .......................
7A-21. Cleaning, Inspection and Repair of Main
Gear Oleo ......................................
7A-22. Assembly of Main Gear Oleo ..........................
7A-23. Removal of Main Landing Gear ........................
7A-24. Cleaning, Inspection and Repair of Main
Landing Gear ..................................
7A-25. Installation of Main Landing Gear .... .................
7A-26. Adjustment of Main Landing Gear ......................
7A-27. Alignment of Main Landing Gear ......................
7A-28. Removal of Main Gear Door Assembly ................
7A-29. Cleaning, Inspection and Repair of Main
Gear Door Assembly .............................
7A-30. Installation of Main Gear Door Assembly ..............
7A-31. Adjustment of Main Gear Door Assembly ..............

Revised: 10/3/83

2H1

2H4
2H4
2H6
2H6
2H6
2H6
2H7
2H7
2H 0.
-2H13
2H 14
2H16
2H17
2H18
2H 19
2H21
2H21
2H22
2H22
2H22
2H23
2H23
213
216
217
218
2III
2113
2I13
2I13
2I14

Paragraph
7A-32.

7A-39.

7A-48.

7A-55.
7A-56.

Revised: 8/3/81

Aerofiche
Grid No.
Landing
7A-33.
7A-34.
7A-35.
7A-36.
7A-37.

Gear Limit Switches ..................................
Adjustment of Nose Gear Up Limit Switch .............
Adjustment of Nose Gear Down Limit Switch ...........
Adjustment of Main Gear Up Limit Switch .............
Adjustment of Main Gear Down Limit Switch ..........
Adjustment of Landing Gear Safety Switch
....
(Squat Switch) .............................
7A-38. Adjustment of Gear Back-Up Extender Actuator
Switch ........................................
Landing Gear Warning Switches (Throttle Switches) ..............
7A-40. Landing Gear Up/Power Reduced Warning Switch ......
7A-41. Removal of Landing Gear Up/Power Reduced
Warning Switch ...................
..............
7A-42. Installation of Landing Gear Up/Power Reduced
Warning Switch ..........
.....................
7A-43. Adjustment of Landing Gear Up/Power Reduced
Warning Switch ..................................
7A-44. Gear Down/ Selector Handle Up Warning Switch ........
7A-45. Removal of Gear Down/Selector Handle Up
Warning Switch .................................
7A-46. Installation of Gear Down/Selector Handle Up
Warning Switch ..............................
7A-47. Adjustment of Gear Down/Selector Handle Up
Warning Switch .................................
Wheels .......................................................
7A-49. Removal and Disassembly of Nose Wheel ...............
7A-50. Inspection of Nose Wheel Assembly. ...................
7A-51. Assembly and Installation of Nose Wheel ...............
7A-52. Removal and Disassembly of Main Wheel ..............
7A-53. Inspection of Main Wheel Assembly ...................
7A-54. Assembly and Installation of Main Wheel...............
Brake System ................................................
Wheel Brake Assembly ........................................
7A-57. Brake Adjustment and Lining Tolerance ................
7A-58. Removal and Disassembly of Wheel Brake
Assembly .......................................
7A-59. Cleaning, Inspection and Repair ofWheel
Brake Assemblies ................................
7A-60. Assembly and Installation of Wheel Brake
Assembly .......................................

2H2

2114
2114
2115
2116
2116
2118
2118
2118
2118
2118
2118
2119
2120
2120
2120
2120
2121
2121
212
2121
2123
2124
2124
2124
2124
2124
2J
2J2
2J2

Paragraph
7A-61.

7A-67.

7A-73.
7A-74.
7A-75.
7A-76.

Aerofiche
Grid No.

Brake Master Cylinder (Hand Parking Brake) ....................
7A-62. Removal of Brake Master Cylinder ....................
7A-63. Disassembly of Brake Master Cylinder .................
7A-64. Cleaning, Inspection and Repair of Brake
Master Cylinder ................................
7A-65. Assembly of Brake Master Cylinder ....................
7A-66. Installation of Brake Master Cylinder ............
......
Brake Cylinder (Toe Brake) ...............................
7A-68. Removal of Brake Cylinder ...........................
7A-69. Disassembly of Brake Cylinder ........................
7A-70. Cleaning, Inspection and Repair of Brake
Cylinder ........................................
7A-71. Assembly of Brake Cylinder ......................
....
7A-72. Installation of Brake Cylinder .........................
Bleeding Procedure ................................
...........
Bearing Replacement ........................................
Nose Gear Service Tolerances ...................................
Main Gear Service Tolerances ..................................

Revised: 10/3/83

2H3

2J2
2J2
2J4
2J4
2J4
2J5
2J7
2J7
2J7
2J8
2J9
2J10
2J10
210
2J20
2J23

PIPER CHEROKEE SERVICE MANUAL

SECTIONVIIA
LANDINGGEAR AND BRAKESYSTEM
PA-28R
7A-1, INTRODUCTION. In this section are instructions for the overhaul, inspection and
adjustment of the various components of the PA-28R landing gear and brake system. Also
included are adjustments for the electricallimit, safety and warning switches, and the hydraulic
function of the brakes. Information on the hydraulic system for raising and lowering the
landing gear is covered in Section VI.
7A-2. DESCRIPTION. The PA-28R airplane is equipped with a retractable, tricycle, air-oil,
strut-type landing gear which is-hydraulically operated by an electrically powered reversible
pump. A selector handle on the instrument panel to the left of the control quadrant is used to
select gear UP or DOWN positions.
Gear positions are indicated by three green lights located below the selector lever for gear
down and locked, and a yellow light located at the top of the instrument panel for intransit
positions. There is no light to indicate the gear has fully retracted other than all lights are out.
As the landing gear swings to the down position and each downlock hook moves into its
locked position, a switch at each hook actuates the switch to the NO (Normally Open) circuit
to indicate by a green light that the individual gear is safelydown and locked. The activation
of all three downlock switches will also shut the hydraulic pump off. As the instrument lights
are turned on, the green lightswill dim. When the gear beginsto retract and the downlock hook
disengages, the down limit switch actuates the switch to the NC circuit, and in series with the
NC circuit of the up limit switch, allows the intransit light to come on. The intransit light will
remain on until the gear is up and all up limit switches are actuated to their NO (Normally
Open) circuit.
To the left of the yellow intransit light is a red warning light which operates
simultaneously in conjunction with the warning horn, and they have a twofold purpose.
Their primary purpose is to give warning when power is reduced below approximately 14
inches of manifold pressure and the landing gear has not reached the down and locked
position. This circuit is controlled by the three paralleling down limit switches connected in
series with a throttle switch (Switch "A") located in the control quadrant. The secondary
function of the warning light and horn is to givewarning when the gear selector handle is up
and while the airplane is on the ground or airspeed is below that required to close the
hydraulic valve and the pump switch of the backup gear extender unit. When the airplane is
setting on the ground, the warning circuit is controlled through the NO side of the safety
switch (squat switch) located on the left gear and the up position of the selector lever.
Should the airplane be raised from the ground, such as in flight, far enough to move the
safety switch to its NC position, then current is directed in series through the hydraulic
pressure switch, the pump switch (providing airspeed has actuated the switch to its NO
position), throttle switch (Switch "B") and the up positioned selector lever. Throttle switch
"B" is located forward of the instrument panel directly below the arm of the throttle lever.

Reissued:
1/15/81

2H4

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

The up limit, safety, throttle, pressure and selector switch, and pump solenoids are all
protected by the landing gear control and warning circuit protector. (Refer to Figure
7A-13.)
Each landing gear is retracted and extended by a single hydraulic cylinder attached to
the drag link assembly of the nose gear and the side brace link assemblyof the main gears.
As the gears retract, doors partially enclose each gear through mechanical linkage.The gears
are held in their up position by hydraulic pressure alone on the cylinder. There are no
uplocks and loss of hydraulic pressure will allow the gears to drop. It is preferred that the
gears be extended and retracted with the use of the gear selector handle; however in the
event of hydraulic loss or electrical failure, they can be lowered by pushing down on the
emergency extension lever between the pilot seats or they will drop themselves should
arispeed drop below approximately 105 MPH, engine power off. In either instant the
hydraulic valve of the back-up extender unit opens to allow hydraulic pressure to neutralize
between each side of the cylinder pistons The emergency extension lever can also be used
to manually overcome system malfunctions or to meet special pilot needs such as, a
deliberate wheels up landing - needed for emergency landings on water, or during various
flight maneuvers where airpseed and power settings would normally allow the gear to
extend. It also permits gear retraction after take-off at speeds lower than those normally
permitted by the automatic system. Whenusing the manual extension lever the gear position
is controlled by the selector switch, regardlessof airspeed/power combinations.An override
lock mechanism is installed on 1972 models and is also available in Kit form for earlier
models, which allows the pilot to lock the extension lever in the up overrideposition, thus
bypassing the automatic portion of the system. A flashing warning light is mounted below
the gear selector lever to indicate whenever the lock is in use. The lock is disengagedby
pulling up on the extension lever. To assist the nose gear to extend under these conditions
are two springs attached to the nose gear. The main gears require no assist springs.Once the
gears are down and the downlock hooks engage, a spring maintains each hook in the locked
position until hydraulic pressure again releases it. A further description of the hydraulic
system and the gear back-up extender unit may be found in Section VI, Hydraulic System.
The nose gear is steerable through a 60 degree arc by the use of the rudder pedals. As
the gear retracts, however, the steering linkage becomes separated from the gear so that
rudder pedal action with the gear retracted is not impeded by the nose gear operation. A
shimmy dampener is also incorporated in the nose wheel steering mechanism. Bungees are
also incorporated on the push rods of later models. (1974 models and up) These springs
make lighter and smoother ground steering possible.
The two main wheels are equipped with self-adjusting single disc hydraulic brake
assemblies. On models previous to 1974 models, these brake assemblies are actuated by
individual toe brake cylinders mounted on the pilot's (optional on the copilot's) rudder.
pedals and a handle connected to a brake cylinder located below and forward of the center
of the instrument panel. On 1974 models and up, these toe brakes are standard on both the
pilot's and copilot's rudder pedals. A parking brake is incorporated with the handle, and
may be used by pulling back on the handle and pushing forward on the button to the left of
the handle. To release the hand brake, pull aft on the handle and allow it to swingforward.
Hydraulic fluid for the cylinders is supplied by a reservoirinstalled on the left forward side
of the fire wall.

Reissued: 1/15/81

2H5

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL
7A-3. TROUBLESHOOTING. Mechanical and electrical switchtroubles peculiar
to the landing gear system are listed in Table VIIA-I at the back of this section.
When troubleshooting, first eliminate hydraulic malfunctions as listed in Section
VI. Then proceed to switch malfunctions and last to the mechanical operation of
the gear itself, both of which are listed in this section. Always place the airplane
on jacks before attempting any troubleshooting of the gear. To operate the gear,
the emergency gear lever must be maintained in the up override position.
7A-4.

LANDING GEAR SYSTEM.

7A-5.

NOSE LANDING GEAR.

7A-6. DISASSEMBLY OF NOSE GEAR OLEO. (Referto Figure 7A-1.) The nose
gear oleo assembly may be removed and disassembled from the gear oleo housing with the gear removed from or installed on the airplane.
a. Place the airplane on jacks. (Referto Jacking, Section II.)
b. Place a drip pan under the nose gear to catch spillage.
c. Remove air and fluid from the oleo strut. Depress the air valve core pin
until strut chamber pressure has diminished, remove the filler plug and with a
small hose siphon as much hydraulic fluid from the strut as possible.
d. To remove the complete cylinder and fork assembly from the oleo housing
(21), cut safety wire (2) at the top of the unit and remove cap bolts (1) that attach
steering arm (11) and aligner guide bracket (12) to the top of the oleo cylinder (23).
e. Disconnect the shimmydampener by removing each cotter pin, nut, washer
and bolt that connects the dampener to the oleo cylinder (23) and housing.
f. Release and remove the snap ring (17) and washer(s) (43), if installed at
the top of the housing (21), and pullthe complete cylinder and fork assembly from
the bottom of the housing. The upper and lower housing bushings (20 and 22)
should remain pressed in the housing.
g. To remove the piston tube (39) and fork (42) from the cylinder (23), first
separate the upper and lower torque links (24 and 26) by removing the link connecting bolt assembly (25) and then separate the two links. Note spacer washer
between the two links.
h. Compress the piston tube (39), reach up along the tube and release the snap
ring (38) from the annular slot at the bottom of the oleo housing.

Reissued: 1/15/81

2H6

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEESERVICE MANUAL

i . Pull the piston tube (39) with component parts from the cylinder.
j . The piston tube components may be removed by reaching in the tube and
pushing out the upper bearing retainer pins (27). Slide from the tube, the upper
bearing (29), lower bearing (34) with outer and inner "O" rings (33 and 35), wiper
strip (36), washer (37) and snap ring (38).
k. To remove the orifice tube (30), remove the large lock nut (16) and lock
washer (19) from the top of the cylinder. Pull the tube from the cylinder.
1. The orifice plate (31) is removed from the bottom of the orifice tube by releasing the snap ring (32) that holds the plate in position.
m. To remove the piston tube plug (40) with "O" ring (41) located in the lower
end of the tube, remove the bolt assembly and insert a rod up through the hole in
the body of the fork (42). Push the plug out through the top of the tube.
7A-7. CLEANING, INSPECTION AND REPAIR OF NOSE GEAR OLEO.
a. Cleanall parts with a suitable dry type cleaning solvent.
b. Inspect the landing gear oleo assembly component for the following:
1. Bearings and bushings for excess wear, corrosion, scratches and overall damage.
2. Retaining pins for wear and damage.
3. Lock rings for cracks, burrs, etc.
4. Cylinder and orifice tube for corrosion, scratches, nicks and excess
wear.
5. Upper and lower cylinder bushings loose or turning in cylinder.
6. Orifice plate for hole restriction.
7. Fork tube for corrosion, scratches, nicks, dents and misalignment.
8. Air valve general condition.
c. Repair of the oleo is limited to smoothing out minor scratches, nicks and
dents and replacement of parts. (See Figure 7A-26 and Table VIIA-II.)
7A-8. ASSEMBLY OF NOSE GEAR OLEO. (Refer to Figure 7A-1.)
a. Ascertain that parts are cleaned and inspected.
b. To install the piston tube plug (40), first lubricate the tube plug and "0"
ring (41) with hydraulic fluid (MIL-H-5606) and install the "0" ring on the plug.
Lubricate the inside wall of the tube (39), insert the plug into the top of the tube
and push it to the fork end. Align the bolt holes of the fork, tube and plug, and
install bolt assembly.
c. If desired, cement a cork in the hole in the bottom of the fork body to prevent dirt from entering between the fork and tube.
d. To assemble the components of the orifice tube (30), insert the orifice plate
(31) into the bottom of the tube, with the countersunk side of the orifice hole ex-

Reissued: 1/15/81

2H7

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

1714

12
13
14

2.

CAP BOLTS AND WASHERS

3.
4.

SUPPORT FITTING
RUSHING SUPPORT FITTING
BUSHING
BOLT, WASHERS, NUT AND COTTER PIN
BOLT, WASHERS, NUT AND COTTER PIN
AXLE3
CAP BOLT
BUSHING, ROLLER FITTING

5.

6.
7.
8.
9
I.

11. ARM, STEERING
BRACKET ALIGNER
CAP, AIR VALVE
CORE, AIR VALVE
BODY, AIR VALVE
NUT, ORIFICE TUBE
SNAP RING
ROLL PIN
WASHER, STOP
BUSHING, UPPER\
HOUSING, STRUT
BUSHING, LOWER
OLEO CYLINDER
LINK, UPPER TORQUE
BOLT, WASHER, BUSHINGS,
LINK, LOWER TORQUE
PIN, BEARING RETAINING
"O" RING
BEARING, UPPER TUBE
TUBE, ORIFICE
PLATE, ORIFICE
SNAP RING
"O" RING
BEARING, LOWER TUBE
RING
"O"
WIPER STRIP
WASHER
SNAP RING
TUBE, PISTON
PISTON TUBE PLUG
"O" RING
PORK
WASHER

12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
36.
39.
40.
41.
42.
43.

22
23

24
25
26

NUT AND COTTER PIN

Figure 7A-1.

Reissued: 1/15/81
Reissued:

1/15/81

Nose Gear Oleo Strut Assembly

2H8 LANDING GEAR AND BRAKE SYSTEM
2H8

PIPER CHEROKEE SERVICE MANUAL

1733

1716

10
11

12
13
14
15
16
17
18
19
19
43
20

27

21
29
30
31
22

38

23

39
24
25
40
41

26

42

1736

Figure 7A-I. Nose Gear Oleo Strut Assembly (cont)

Reissued: 1/15/81

2H9

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

posed. Secure the plate with the snap ring (32), lubricate and install the "O" ring
(28) on the upper end of the tube.
e. Insert the orifice tube (30) up through the bottom of the cylinder (23). With
the tube exposed through the top of the cylinder, install the lock washer (19) and
insert roll pin (18) through the lock washer into the piston. Install the tube lock
nut (16) finger tight at this time.
f. The fork (42)and tube (39)assemblymay be assembled byinstallingthe tube
components on the tube. In order slide onto the tube, the snap ring (38), washer
(37), lower bearing (34) with outer and inner "O" rings (33and 35)andupperbearing (29). Align the lock pin holes in the upper bearing with the pin holes in the
piston tube (39) and install pins (27).
g. Lubricate the inner wall of the cylinder(23) withhydraulic fluid. Carefully
insert the piston tube assembly into the bottom of the cylinder, allowing the orifice tube to guide itself into the fork tube, until the snap ring (38) can be installed
in the annular slot at the bottom of the cylinder. Install wiper strip (36), slide
washer (37) into position and secure assembly with snap ing (38).
h. At the top of the cylinder (23), tighten (torque) the orfice tube lock nut (16).
i. Ascertain that bushings are installed in the upper and lower torque links
(24 and 26) and then install both links. The torque link bolt assemblies should be
lubricated and installed with the flat of the bolt head hex adjacent to the milled
stop on the wide end of the link. Tighten the bolts only tight enough to allow no
side play in the link, yet be free enough to rotate.
j. Ascertain that the upper and lower oleo housing bushings (20 and 22) are.
installed. Install the cylinder into the oleo housing, position spacer washer(s)
(43) over the top of the cylinder and secure with snap ring (17). Install spacer
washers as required to obtain .0 to .015 of an inch thrust of the cylinder within
the housing.
k. At the top of the oleo housing, install on the cylinder the aligner guide bracket (12) and steering arm (11). Install cap bolts (1), tighten 20 to 25 inch pounds
torque and safety with MS20995C40 wire (2).
l. Install the shimmy dampener and safety.
m. Lubricate the gear assembly (Refer to Lubrication Chart, Section II).
n. Compress and extend the strut several times to ascertain that the strut will
operate freely. Weight of the gear wheel and fork should allow the strut to extend.
o. Service the oleo strut with fluid and air. (Refer to Oleo Struts, Section II.)
p. Checknosegearfor alignment (Referto Paragraph '7A-14)andgear operation.

7A-9. REMOVAL OF NOSE LANDING GEAR. (Refer to Figure 7A-2.)
a. Remove the engine cowling by the following procedure:
1. Release the fasteners on each side and at the top aft end of the cowl.
2. Lift the aft end of the top cowl and then slide it forward to release the

Reissued: 1/15/81

2H10

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

SEE VIEW A

FORCLARITY

SEEVIEW A

ROD, STEERING
JAM NUT
BOLT AND NUT ASSEMBLY
STEERING BELLCRANK
BUSHING. STEERINGARM
BEARING,SPRING ROLLER
BOLT,WASHER, NUT,
AND COTTERPIN
8. CAP, AIR VALVE
9. BODY,AIR VALVE
10. SAFETYWIRE
11. CAP BOLT AND WASHER
12. ROLLER,ALIGNERGUIDE
13. BOLTASSEMBLY
(SEE VIEWS A & B)
14. BRACKET,ALIGNER
15. SPRING, INNER
16. ARM, STEERING
17. SPRING OUTER
18. BOLT, WASHERS, NUT,
AND COTTER PIN
1.
2.
3.
4.
5.
6.
7.

Figure 7A-2. Nose Gear Installation

Interim Revision: February 15, 1995

LANDINGGEAR AND BRAKE SYSTEM

2H11

PIPER CHEROKEE SERVICE MANUAL
BUNGEEASSEMBLY(1974MODELSANDUP)

VIEWA

VIEWB
PRIORTO 1974

VIEWC
1974MODELSANDUP

VIEWB ANDC

19.LINK,UPPER
20. ROD,PISTON
21. BOLT,WASHERS,NUT,
ANDCOTTERPIN
22. LINK,LOWER
23. WHEEL
24. TIRE
25. FORK
26. SHIMMYDAMPENER
27. BOLT,WASHER,NUT,
AND COTTER PIN

28. BRACKET,SHIMMYDAMPENER
29. BOLT,WASHERS,NUT,
ANDCOTTERPIN
30. JAM NUT
31. RODENDBEARING
32. DRAGLINK,LOWER
33. BOLT,WASHERS,NUT,
ANDCOTTERPIN
34. BOLT,WASHERS,NUT,
ANDCOTTERPIN
35. DRAGLINK,UPPER
36. GEARDOORS

BUSHING,
37. BOLT,WASHERS,
NUT,ANDCOTTERPIN
BUSHING,
SHOULDER
38. BOLTANDNUT
ANDNUT
39. BOLT,WASHERS,
40. JAMNUT
41.JAM NUT

42. SPRING,DOWNLOCK
HOOK
43. FITTING,DOWNLOCK
44. RODENDBEARING
45.JAM NUT
46. ROD,ACTUATOR
47. ROD,RETRACTION
48. JAMNUT
49. RODENDBEARING
GEARDOOR
ASSEMBLY,
50. RETRACTION
51.SPRING
52.CYLINDER,HYDRAULIC
53.ARM,SPRING
54. HOUSING,STRUT
55. ENGINEMOUNT
56. GEARUP STOP

Figure 7A-2. Nose Gear Installation (cont.)

Interim Revision: February 15. 1995

LANDINGGEARAND BRAKE SYSTEM

2H12

PIPER CHEROKEE SERVICE MANUAL

two stud type front fasteners.
Remove the top cowl.
3. Disconnect the electrical lead to the landing light at the quick disconnect at the left inside of the bottom cowl.
4. Disconnect the nose landing gear door control rods at each door by removing the connecting bolts with nuts and washers.
.. Remove the bottom cowl support screws, two located at.the side of each
gear door hinge.
6. Remove the bottom cowl attaching screws from around its aft end and
remove cowl.
b. Place the airplane on jacks. (Refer to Jacking; Section II.)
c. Disconnect the two gear tension springs (15 and 17) from the spring arm
(53) that is attached to the right side of the strut housing (54).
d. Retract nose gear slightly to remove the gear from its downlocked position.
e. To remove the upper and lower drag links (32 and 35), the following procedure may be used:
1. Disconnect the rod end (44) of the hydraulic cylinder (52) from the downlock fitting (43) by removing nut and bolt that connects these two units.
2. Retract the gear and disconnect the gear downlock spring (42) from the
upper drag link (35).
3. Remove the gear tension spring arm (53) from the right side of the oleo
housing (54) and lower drag link (32) by removing the cotter pin, nut and washer
from the bolt (29) that connects the drag link to the housing. Slide the arm and
spacer washer from the bolt.
4. Remove the cotter pins, washers and nuts from the bolts that secure the
upper drag link (35) to the engine mount (55).
5. Slide the attachment bolts from the upper and lower drag links and remove the links.
f. With the lower drag link (32) disconnected from the gear oleo housing (54),
the housing may be removed by removing cotter pins, nuts, washers, and bolts
(7 and 33) at the attachment points on each side of the housing at the engine mount.
g. The steering bellcrank (4) may be removed by removing the nut and bolt (3)
at the steering rod, and the bolt assembly(13) with bushing at the bellcrankpivot point.
7A-10. CLEANING, INSPECTION AND REPAIR OF NOSE LANDINGGEAR
a. Clean all parts with a suitable dry type cleaning solvent.
b. Inspect the gear components for the following unfavorable conditions:
1. Bolts, bearings and bushings for excess wear, corrosion and damage.
2. Gear housing, drag links, torque links, and tension spring arm for
cracks, bends or misalignment.
3. Downlock hook for excess wear of the hook and bearing surfaces.
4. Downlock rollerbearing for freedom of movement and excessive wobble.

Reissued: 1/15/81

2H13

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

c. Inspect the gear tension and downlock hook springsfor the following:
1. Excess wear or corrosion, especially around the hook portion of the springs. A
spring should be rejected if wear or corrosion exceeds one-quarter the diameter of the
spring. Clean away all corrosion and repaint.
2. Check the gear tension springs for load tensions below minimum allowable
tolerances. The minimum allowable tension of the inner spring is 37 pounds pull at 13.75
inches and the outer is 60 pounds pull at 13.75 inches. Measurement is taken from the inner
side of each hook. If it is found that either spring should be rejected, replace both springs.
3. Check the gear downlock hook spring for load tension below minimum
allowable tolerance. The minimum tension of the spring is 10.5 pounds pull at 4.5 inches.
Measurement is also taken from the inner side of each hook.
d. Check the general condition of each limit switch and its actuator, and wiring for
fraying, poor connections or conditions that may lead to failures.
e. Check drag link through center travel by attaching the upper and lower drag links,
setting them on a surface table, and ascertaining that when the stop surfaces of the two links
touch, linkage is not less than .062 to .125 nor more than .125 to .250 of an inch through
center. Should the distance exceed the required through center travel and bolt and bushing
are tight, replace one or both drag links.
f. The shimmy dampener requires no service other than routine inspection. In case of
damage or malfunction, the dampener should be replaced rather than repaired.
g. Repair to the landing gear is limited to reconditioning of parts such as replacing
bearings and bushings, smoothing out minor nicks and scratches, repainting of areas where
paint has chipped or peeled and replacement of parts.
7A-11. INSTALLATIONOF NOSE LANDINGGEAR. (Refer to Figure 7A-2.)
NOTE
When assembling any units of the landing gear; lubricate
bearings, bushings, and friction surfaces with the proper
lubricant as described in Section II.
a. Attach the steering bellcrank (4) with bushing to its mounting plate on the engine
mount (55) securing with the bolt assembly (13). Align the steering bellcrank (4) and the
steering arm bushings (5) by positioning the spacer washers as shown in Figure 7A-2.
Connect the steering rods (1) to the bellcrank (4) and install bolt and nut assemblies (3).
The adjustment, fore and aft of the bellcrank, may be made after the gear has been installed
and riggedand adjusted.
b. To install the gear housing assembly, position the gear so that the bolt attachment
points on the housing (54) align with the attachment points on the engine mount (55).
Install pivot bolts, washers and nuts (7 and 33). Tighten the nuts to a snug fit, yet allowing
the gear to swingfree, and safety.

Reissued: 1/15/81

2H14

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

c. The drag links (32 and 35) and gear tension spring arm (53) may be installed by the
followingprocedure:
1. Ascertain that the upper and lower links (32 and 35) are assembled with the
downlock hook attached, and the through travel of the links checked according to
paragraph 7A-10.
2. Position the link assembly to allow the bolt holes in the links to align with the
bolt holes in the gear housing and the engine mount. Install the link attachment bolts.
3. Install nuts and washers on the upper link (35) attachment bolts. Tighten the
nuts to allow the links to rotate freely and safety.
4. Check alignment of the downlock hook to determine if it grips the roller bearing
so as not to contact the bolt head, the bearing attachment block or washer. If the downlock
hook is inboard, or it contacts the bolt head, shim between the bearing and the bearing
attachment block with washer AN960-1OL,not to exceed three. The bearing must be free to
rotate, therefore, it may be necessary to replace the bearing retainingbolt with longer bolt,
AN23-36A, depending on the number of washers used. Should the downlock hook be
onboard, or in contact with the bearing attachment block, add one washer, P/N 62833-40
of P/N 62833-41 between the engine mount (55) and upper drag link (35). Washer, P/N
6283341, is to be tried first.
5. Install the gear tension spring arm (53) on the drag link bolt (29) on the right
side of the gear oleo housing (54), secure and safety. A washer is installed on the bolt
between the lower drag link and the arm.
d. Retract and extend the landing gear several times to ascertain smoothness of
operation. Also check that the drag link assembly falls into the through center-locked
position.
e. Retract the gear and connect the gear downlock spring (42) between the downlock
hook (43) and the upper drag link (35).
f. Extend the gear and connect the two gear tension springs (15 and 17) between the
attachment point on the oleo housing (54) and the spring arm (53).
g. Ascertain that the landing gear is lubricated per Lubrication Chart, Section II.
h. Check adjustment of the gear per paragraph 7A-12 or 7A-13.
i. Install engine cowling. (The cowl support jacks located at each forward side of the
nose gear door hinges are adjusted down to contact the cowl surface after attaching screws
are secure.)
j. Retract landing gear and check door operation as per paragraph 7A-18.
k. Check the alignment of the nose gear per paragraph 7A-14.
1. Remove the airplane from jacks.

Reissued: 1/15/81

2H15

LANDINGGEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

1.
2.
3.
4.

STEERIN BELLCRANK
CROSS-OVER TUBE
STEERING ROD
ACTUATOR ROD, CYLINDER

Figure 7A-3.

5.
6.
7.
8.

JAM NUT
ROD END BEARING
OLT ASSEMBLY
DOWNLOCK HOOK

.
10.
11.

SHIMMY DAMPENER
STRUT HOUSING
SPRING

Nose Gear Adjustment (Without Gear Up.Stop)

7A-12. ADJUSTMENT OF NOSE LANDINGGEAR (Without GearUp Stop). (Refer.
to Figure 7A-3.)
a. Place the airplane on jacks. (Refer to Jacking, Section II. )
b. With the gear extended, disconnect the nose gear door retraction rods from
each door by removing the rod attaching bolts. If desired, the lower engine cowl
may be removed to facilitate easier access for adjustments.
by turning the master switch
c. Retract the landing gear hydro-electrically
on, raising the emergency gear extension lever and moving the gear selector han dle to the up position. Retain the emergency extension lever in the up override
position.
d. Clearance between the strut housing (10) and the cross-over tube (2) where
the steering bellcrank (1) attaches should be 0. 015± 0. 003 of an inch with the
piston of the actuator cylinder bottomed. Should this dimension be incorrect and
it will require more than 0. 010 of an inch to bring the housing to the correct
clearance, then block the gear in the up position, disconnect the piston rod end
bearing from the downlock by removing the attaching bolt, loosen the jam nut on
the end bearing to obtain correct adjustment. Reinstall attaching bolt and safety.
When adjustment requires less than 0. 010 of an inch, the rod end bearing need

Reissued: 1/15/81

2H16

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

1823
2

12

*

1.
2.
3.
4.

STEERING BELLCRANK
STEERING ROD
UPPER DRAG LINK
GEAR UP STOP

Figure 7A-4.

5.
6.
7.
8.

JAM NUT
ACTUATOR ROD, CYLINDER
JAM NUT
ROD END BEARING

9. BOLT ASSEMBLY
10. DOWNLOCK HOOK
11. SHIMMY DAMPENER
12. STRUT HOUSING

Nose Gear Adjustment (With Gear Up Stop).

not be disconnected and therefore all that will be required is to loosen the jam
nut, place a wrench on the flat at the end of the piston rod and turn to obtain the
correct adjustment.
e. Check rod end bearing for adequate thread engagement and tighten jam nut.
f. With gear extended, adjust shimmy dampener by turningnose wheelagainst
stops and adjusting rod end for adequate travel for both extremes.
g. Remove the airplane from jacks.
7A-13. ADJUSTMENT OF NOSE LANDING GEAR (With Gear Up Stop). (Refer
to Figure 7A-4.) The gear up stop (4) is located just above the gear door retraction roller near the lower aft end of the engine.
a. Remove the engine cowl. For removal instructions, refer to paragraph
.7A-9, step a.
b. Place the airplane on jacks. (Refer to Jacking, Section II.)
c. Retract the landing gear hydro-electrically
by turning the master switch
on, raising the emergency gear extension lever and moving the gear selector
handle to the UP position. Retain the emergency extension lever in the UP Override position.

Reissued: 1/ 15/81

2H17

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

d. Check the adjustment of the gear up stop by placing a carpenters square
with the longest end along the bottom of the fuselage, and the shortest end running up through the centerline of the wheel axle. Measure up along the square
from the bottom of the fuselage 6.25 ± .25 inches, to determine if the center of
the wheel axle meets this measurement.
If this measurement is incorrect, extend the gear, loosen the jam nut (5) on the gear up stop, and make the required
adjustment by turning the stop.
e. Check the adjustment of the hydraulic cylinder by extending the gear and
removing the nut and bolt (9) from the rod end bearing (8). Loosen the jam nut
that secures the rod end bearing and turn the rod end approximately one thread
in past the safety hole on the cylinder rod (6).
f. Hook-up cylinder rod end bearing and retract gear. Recheck all adjustments
and retighten the jam nut on the gear up stop. When the gear is fully retracted,
the upper drag link (3) should be firmly against the gear up stop. Extend the gear.
g. Adjust shimmy dampener by turningnose wheel against stops and adjusting
the rod end of the dampener for adequate travel to both extremes.
h. Install engine cowling, retract landing gear and check door per paragraph
7A-18.
i. Remove the airplane from jacks.
7A-14. ALIGNMENT OF NOSE LANDING GEAR. On 1974 models the nose wheel
steering has been modified by the addition of the bungee system. This will require some
different adjustment procedures which are included with the regular instructions below.
a. Place the airplane on a smooth level floor that will accommodate the striking of a
chalk line.
b. Ascertain that the nose gear is properly adjusted as given in Paragraph 7A-12 or
7A-13.
c. With the landing gear in the down-locked position, weight proportionally on the
nose gear and the nose wheel facing forward, adjust the steering bellcrank. The bellcrank is
attached at the lower front of the engine mount directly aft of the gear housing and may be
adjusted by looseningits attachment bolt and slidingthe bellcrank fore and aft until it clears
each steering arm rollers by .03 of an inch. Retighten the attachment bolt.
d. Place the airplane on jacks. (Refer to Jacking, Section II.)
e. Level the airplane laterally and longitudinally. (Refer to Leveling,Section II.)
f. From the center point of the tail skid, extend a plumb bob and mark the contact
point on the floor.
g. Extend a chalk line from the mark on the floor below the tail skid to a point
approximately three feet forward of the nose wheel. Allow the line to pass under the wheel
at the center line of the tire. Snap the chalk line.
h. Clamp the rudder pedals to align then in a lateral position. Ascertain that the rudder
pedals are in there neutral position. (Refer to Figure 7A-6 and Table VII-I.)

Reissued: 1/15/81

2H18

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

A599

1737

See Table VII-I for RudderPedalNeutral Angle

Figure 7A-5. Clamping Rudder
Figure 7A-6. Rudder Pedals
Pedals in Neutral Position
at Neutral Angle
i. Adjust the rod end bearings of each steering control rod to align the nose wheel with
the chalk line and to bring the rudder pedals into neutral angle fore and aft.
j. On 1974 models install the steering push rods on the pilot's rudder pedals. Adjust
the rods so the lengths are both the same and the rudder pedals are at their neutral position.
(Refer to Table VII-I.)
k. To align the nose wheel straight forward, stand in front of the nose gear and align
the center rib of the tire with the chalk line, or lay a straight edgealong the side of the tire
and parallel the straight edge with the chalk line.
1. On 1974 models install the nose wheel bungees in there neutral position (no load on
the bungee springs.)Adjust bungee rod ends as necessary.
m. Place a bubble protractor against a rudder pedal steering tube to check the neutral
angle as givenin Table VII-I for the perticular model being serviced.
n. On earlier models one end of each rod must be disconnected and the jam nuts
loosened to make any adjustments. Do not attempt to make the adjustment by means of
one rod end bearing, but divide the adjustment between the bearings at each end of each
rod. Check that the rod ends have sufficient thread engagement by ascertainingthat a wire
will not go through the check hole in the rod. Reinstall the rods and tighten the jam nuts.
o. To check the nose gear steering for its maximum right and left travel, mark on each
side of the nose wheel an angle line from the center line and wheel pivot point. (Refer to
Table VII-I for nose wheel turning angle of the perticular model being serviced.) Turn the
wheel to its maximum travel in both directions to check for allowabletravel. Should travel
be exceeded in one direction and not enough in the other direction, check for possible
damage to the gear fork or torque links.
7A-15. REMOVALOF NOSE GEAR DOOR ASSEMBLY. (Refer to Figure 7A-7.)
a. With the nose gear extended, disconnect the door retraction rod (1) from the door
(2) by removing nut, bolt and washers. If desired the bottom cowl may be removed to
facilitate easier removal.

Reissued: 1/15/81

2H19

LANDING GEAR AND BRAKE SYSTEM

PIPERCHEROKEESERVICEMANUAL

1730

1.
2.
3.
4.
5
6.

ROD, DOOR RETRACTION
DOOR, GEAR
SPRING, TENSION
SELLCRANK ASSEMBLY
ROLLER ASSEMBLY
ROLLER

7. THREADED LINK,
8. COTTER PIN
9. GEAR UP STOP

Figure 7A-7.

Reissued: 1/15/81

Nose Gear Door Retraction

2H20

ROLLER

Mechanism

LANDINGGEAR AND BRAKESYSTEM

PIPERCHEROKEE
SERVICEMANUAL

b. To remove the door(s) from the cowl, bend the end of the hinge pin straight
and from the other end pull out the pin.
c. The bellcrank assembly (4) of the door retraction mechanism may be removed by removing the attached hardware, disconnecting the door down tension
spring (3) and removing the cotter pins (8) at each end of the pivot tube. Slide
the insulating sleeve and bushing tube from the bellcrank.
d. The roller assembly (5) of the mechanism may be removed by removing the
attached hardware and pivot bolt with insulator.
7A-16. CLEANING, INSPECTION AND REPAIR OF NOSE GEAR DOOR ASSEMBLY.
a. Clean all parts with a suitable cleaning solvent.
b. Inspect doors for cracks or damage, loose or damaged hinges and brackets.
c. Inspect door retraction rods for damage and rod end bearing for corrosion.
d. Check the door tension spring for wear and tension below minimum allowable tolerance. Reject spring if load tension is below 8.0 pounds pull at 4.75 inches.
e. Check general condition of bellcrank and roller assembly.
f . Repairs to the doors may be replacement of hinges, repair of fiberglass
and painting.
g. Repairs to the retraction mechanism is limited to replacement of parts,
and sanding and painting.

7A-17. INSTALLATION OF NOSE GEAR DOOR ASSEMBLY. (Refer to Figure
7A-7.)
a. The roller assembly (5) of the retraction mechanism may be installed by
first assembling the roller (6), threaded link (7) and rollerlinks (5), and theninstalling this assembly on its mountingbracket. Ascertain that an insulator sleeve
is installed with the attachment bolt and link bolt.
b. The bellcrank assembly (4) of the retraction mechanism may be installed
by positioning the bellcrank between its mounting bushing and inserting the insulator sleeve and bushing tube. Install a cotter pin through each attachment
bushing and the pivot tube. New tubes will require a .070 hole drilled through
each end to facilitate a cotter pin. Use the existing hole in the mounting bushings
as a guide. Do not connect link between roller assembly and bellcrank until time
of door adjustment.
c. Install the gear door(s) by positioning the hinge halves of the door and cowl,
and inserting the hinge pin. It is recommended a new pin be used. Bend the end
of the pin to secure in place.
d. Install the cowl and adjust doors as given in paragraph 7A-18.

Reissued: 1/15/81

2H21

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

7A-18. ADJUSTMENT OF. NOSE GEAR DOORS
a.. Place the airplane on jacks. (Refer to Jacking, Section II.)
b. Adjust the door retraction rods so thatthe gear will swing throughthe door
opening with a . 12 .06 of an inch clearance between the gear and door at their
closest point. This can best be done with the nose gear down, tension springs
disconnected and operating the nose gear manually.
c. With door clearance adjusted, adjust the link between the roller assembly
and bellcrank assembly so thatthe doors will pull uptightly when gear is full up.
Over-tightening may result in door buckling, however if the link is too loose,
doors will gap in flight.
d. Check all rod ends for adequatethreadengagement,
for safetyandtightness
of jam nuts.
e. Remove the airplane from jacks .
7A -19. MAINLANDING GEAR SYSTEM.
7A-.20 ... DISASSEMBLY OF MAIN GEAR OLEO. (Refer to Figure 7A.-8) The
main gear oleo assembly may be removed and disassembled from the gear oleo
housing with the gear removed from or installed on the airplane.
a. Place the airplane on jacks. (Refer to Jacking, Section II.)
b. Place a drip pan under the main gear to catch spillage.
c. Remove the air and fluid from the oleo. To do this, depress the air valve
core pin until strut pressure has diminished, remove the filler plug and with a
small hose siphon as much hydraulic fluid from the strut as possible.
.d. D isconnect the brake. line. at the jint located in the wheel well.,
e. To remove piston tube 25) assembly from oleo housing (11), remove the
upper and lower torque link connecting bolt assembly (3) and separate the links.
Note number and thickness of spacer washer(s) between the two links (15 and 16).
f. Compress the piston tube (25), reach up along the tube and release the snap
ring (24) from the annualar slot at the bottom of the oleo housing.
g. Pull the piston tube(25) with component parts from the cylinder housing.
h. The piston tube (25) components may be removed by reaching in the tube
and pushing out the upper bearing (18) retainer pins (17). Slide off the upper bearing(18), 'lower bearing (20) with "O" rings (19 and 21), wiper (22), washer (23)
and' snap ring (24).
i. To remove the orifice tube (12) from the oleo housing, remove the lock nut
(6) and washer (7) from the top of the housing. Draw the tube with "O" ring (9)
and retainer (8) from the housing.
j. The orifice plate (13) is removed from the bottom of the orifice tube (12)
by releasing the snap ring (14) that holds the plate in position.

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PIPER CHEROKEE SERVICE MANUAL

k. To remove the piston tube plug (26) with "0" ring (27) located in the lower end of
the tube, remove the bolt assembly and insert a rod up through the hole in the body of the
fork (28), pushing the plug out through the top of the tube.
7A-21. CLEANING,INSPECTIONAND REPAIR OF MAIN GEAR OLEO.
a. Clean all parts with a suitable dry type cleaningsolvent.
b. Inspect the landing gear oleo assembly component for the following:
1. Bearingsand bushings for excess wear, corrosion, scratches and overall damage.
2. Retaining pins for wear and damage.
3. Lock rings for cracks, burrs, etc.
4. Cylinder and orifice tube for corrosion, scratches, nicks and excess wear.
5. Orifice plate for hole restriction.
6. Fork tube for corrosion, scratches, nicks, dents and misalignment.
7. Air valve general condition.
c. Repair of the oleo is limited to smoothing out minor scratches, nicks and dents and
replacement of parts. (See Figure 7A-26 and Table VIIA-III for bearingreplacement.)
7A-22. ASSEMBLYOF MAINGEAR OLEO. (Refer to Figure 7A-8.)
a. Ascertain that all parts are cleaned and inspected.
b. To install the piston tube plug (26), first lubricate the plug "O" ring (27) with
hydraulic fluid (MIL-H-5606) and install it on the plug. Lubricate the inside wall of the
tube. Insert the plug into the top of the tube (25) and push it to the fork end. Align the bolt
holes of the fork, tube and plug, and install bolt assembly.
c. If desired, cement a cork in the hole in the bottom of the fork body to prevent dirt
from entering between the fork and tube.
d. To assemble the components of the orifice tube (12) insert the orifice plate (13)
into the bottom of the tube and secure with snap ring (14).
e. To install the tube (12) in the oleo housing (11), insert the tube up through the
housing. With the end of the tube exposed through the top of the housing, install the "O"
ring (9), retainer (8), washer (7), and lock nut (6). Tighten lock nut only finger tight at this
time.
f. Assemble the components of the piston tube (25) on the tube by placing, in order,
the snap ring (24), washer (23), lower bearing (20) with outer and inner "0" rings (19 and
21) and upper bearing (18). Align the two .125 diameter holes and the lock pin holes with
the corresponding holes in the piston tube (25) and install pins (17) without force. The
outer surface of the pins must not protrude beyond the outer diameter of the bearing (18).
g. Lubricate the wall of the cylinder oleo housing (11) and tube (25), and carefully
insert the tube assembly into the housing, guiding the orifice tube (12) into the piston tube
until the snap ring (24) can be installed in the annular slot at the lower end of the housing.
Install the wiper strip (22); slide the washer (23) into position and secure the assembly with
snap ring (24).

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2H23

LANDINGGEARANDBRAKESYSTEM

INTENTIONALLYLEFTBLANK

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2H24

PIPER CHEROKEE SERVICE MANUAL

1711

3

.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11 .
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
22.

BRACKET SWITCH ACTUATOR
BOLT WASHERS, NUT AND COTTER PIN
BOLT, WASHERS NUT AND COTTER PIN
BOLT WASHERS, NUT AND COTTER PIN
AXLE NUT
NUT
WASHER
RETAINER
"C"
RINS
VALVE ASSEMBLY
HOUSING OLEO STRUT
ORIFICE TUBE
PLATE ORIFICE
SNAP RING
LINK ASSEMBLY. UPPER
LINK ASSEMBLY, LOWER
RETAINER PIN, BEARING
BEARING UPPER
"0"
RING, OUTER
BEARING. LOWER
"O" RING, INNER
WIPER STRIP
WASHER
SNAP RING
PISTON TUBE
PLUG
"O" RING
FORK ASSEMBLY

Figure 7A-8.

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Main Gear Oleo Strut Assembly

211 LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

1713

1717

17

19s
19s
20
23
24
25

26
27

21

Figure 7A-8. Main Gear Oleo Strut Assembly (cont.)

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212 LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

h. At the top of the housing, tighten the lock nut (6).
i. Ascertain that the bushings are installed in the upper and lower torque links (1 and
16) and then install links. The torque link bolt assemblies(2, 3 and 4) should be lubricated
and installed with the flat of the bolt head hex adjacent to the milled stop of the wide end
of the link. (Use the same thickness of spacer washers between the two links as those
removed to maintain correct wheel alignment.) Tighten the bolts only tight enough to allow
no side play in the links, yet be free enough to rotate.
j. Connect the brake line and bleed the brakes per paragraph 7A-73.
k. Lubricate the gear assembly. (Refer to Lubrication Chart, Section II.)
1. Compress and extend the strut several times to ascertain that the strut will operate
freely. The weight of the gear wheel and fork should allow the strut to extend.
m. Servicethe oleo strut with fluid and air. (Refer to Oleo Struts, Section II.)
n. Check main gear alignment (refer to paragraph 7A-27) and gear operation.
o. Remove the airplane from jacks.
7A-23. REMOVALOF MAIN LANDINGGEAR. (Refer to Figure 7A-9.)
a. Place the airplane on jacks. (Refer to Jacking, Section II.)
b. The side brace link assemblymay be removed by the followingprocedure:
1. With the gear in the extended position, disconnect the gear downlock spring

(18).
2. Disconnect the rod end (46) of the actuating cylinder (24) from the retraction
fitting (21) of the upper side brace link (28) by removing the nut, washer and bolt (47) with
bushing and spring swivel(20).
3. Disconnect the lower side brace link (33) from the gear housing (13) by
removing the attachment nut, washer and bolt (7). Note bushings on each side of the end
bearing.
4. Disconnect the upper side brace link (28) from the side brace support fitting
stud (26) by removing the cotter pin, nut, washer and attachment bolt (25).
5. The side brace support fitting may be removed by removing the cap bolts that
secure the fitting to the web of the spar.
6. Remove the assembly, and further disassembleand inspect as needed.
c. The landing gear housing (13) with components may be removed by the following
procedure:
1. Disconnect the brake line (42) at its upper end in the wheel well.
2. Disconnect the gear door actuating rod (38) at the gear housing.
3. Remove the access plate located on the underside of the wing, aft of landing
gear.

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A

NOTE
It may have been necessaryto use specal
landing gearattachment hardware during
of the aircraft due to
assembly
tolerances. Therfore,
manufacturing
special attention should be given when
removing hardware to inspect and insure
the same diameter hardware is used upon
reassembly. Standard AN4 or AN5 bolts
are replaced by alternate oversized bolts
NAS3004 or NAS3005 respectively
when oversized hardware is required.

Figure 7A-9.

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Main Gear Installation

214

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEESERVICE MANUAL

1.
2.
3.
4.
5.
6.
7.
8.
9.

SUPPORT FITTING. AFT
SNAP RING
BEARING
RETAINER, TUBE ASSEMBL
FITTING GREASE
HINGE, GEARDOOR
BOLT,
WASHERS AND NUT
LINK, UPPER
WASHER,
SPACER
10.
LINK, LOWER
11. DOOR,GEAR
12. NUT
13.
HOUSING, STRUt
14. PLUG.
HYDRAULIC
15.
VALVE
ASSEMBLY
16. SUPPORT FITTINGS, FORWARD
17.
FITTING. GREASE
18. SPRING, DOWNLOCK
19. TURNBUCKLE
20.

SWIVEL

FLUID

ASSEMBLY

21.
22.
23.
24.

RETRACTICN FITTING
JAM NUT
ROD,`PISTON
CYLINDER, HYDRAULIC ACTUATING
25. BOLT, WASHERS, NUT AND COTTER PIN
26. STUD, SIDE BRACE SUPPORT
27. SUPPORT BRAKE28. LINK, UPPER SIDE BRACE
29. PLATE
30. HOOK, DOWNLOCK
31. BOLT, WASHERS, NUT AND COTTER PIN
32. PIN, DOWNLOCK
33. LINK, LOWER SIDE BRACE
34. BRACKET, SPRING
35. SWITCH. SAFETY
36. ACTUATOR, SAFETY SWITCH
37. BOLT, WASHERS. NUT AND COTTER PIN
38.
ROD, GEAR DOOR
39 . BOLT, WASHERS. NUT AND COTTER PIN
40.
FORK GEAR
41.
CLAMP
42.
HOSE. BRAKE
43.
BRAKE HOUSING
44J. BRAKE DISC
45.

SKETCHA

1734

21
19

58

TIRE

46.

ROD END
BOLT,WASHER. NUT AND BUSHING
BOLT
SHIM WASHER
BOLT
WASHER
WASHER
BEARING, FORWARD SUPPORT
BEARING, AFT SUPPORT
SNAP RING
56.
ROD END BEARING
57. JAM NUT
58. BRACKET, SWITCH
59.
CLIP,
SAFETY

56

57

33

.
e.
49.
50.
51.
52.
53.
54.
55.

31

28

SKETCHB
Figure 7A-9. Main Gear Installation(cont.)

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4. If not previously disconnected, disconnect the lower side brace link (33)
from the gear housing.
5. Disconnect the forward support fitting (16) of the housing (13) from the
web of the main spar by removing the fitting attachment bolts.
6. Remove the retainer tube (4) in the aft support fitting (1) that supports
the aft arm of the housing by reaching through the access opening on the underside
of the wing, through the hole in the web and removing the bolt (48) that secures
the tube in the housing. Insert a hook through the bolt hole in the tube, and slide
it aft from the support fitting. Remove the tube from the wing. Note the number
of spacer washers (52) between the arm and support fitting (1).
7. Allow the gear to drop down removing it from the wing.
8. The aft support fitting (1) may be removed by holding the nuts, reaching through the access opening, and removing the fitting attachment bolts.
9. The forward support fitting (16) may be removed from the arm of the
housing by removing the bolt and washer from the base side of the fitting. Slide
the fitting from the arm. Remove the washer (52) from the arm.
d. Either bearing (53 or 54) installed in the support fittings may be removed
by removing the snap rings (2) that hold the bearing in the housing. Push the
bearing from the housing.

7A-24. CLEANING, INSPECTION AND REPAIR OF MAIN LANDINGGEAR.
a. Clean all parts with a suitable dry type cleaning solvent.
b. Inspect the gear components for the following unfavorable conditions:
1. Bolts, bearing and bushings for excess wear, corrosion and damage.
2. Gear housing, side brace links, torque links and attachment plates for
cracks, bends or misalignment.
3. Downlock hook for excessive wear of the bearing surfaces.
c. Inspect the gear downlock spring for the following:
1. Excessive wear or corrosion, especially around the hook portion of the
spring. A spring should be rejected if wear or corrosion exceeds one-quarter
the diameter of the spring. Clean away all corrosion and repaint.
2. Check the spring for load tensions below minimumallowable tolerance.
The minimum tension of the spring is 48 pounds pull at 7.9 inches. Measurement is taken
from the inner side of each hook.
d. Check the general condition of each limit switch and its actuator, and wiring for fraying, poor connections or conditions that may lead to failures.
e. Check side brace link through centertravel byattaching the upper and lower
links, setting them on a surface table, and ascertaining that when the stop surfaces of the two links touch, linkage is not less than .062 nor more than . 125 of
an inch through center. Should the distance exceed the required through center
travel and bolt and bushings are tight, replace one or both links.

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f. With the side brace links assembled and checked, ascertain that when the
stop surfaces of the two links contact, the clearance between each downlock hook
and the flat of the downlock pin is not less than 0.010 of an inch. Should clearance be less than that required, the hook only may be filed not to exceed a gap
of more than 0.025 of an inch. The maximum allowable clearance between each
hook and the downlock pin that are service worn is 0.055 of an inch. Should
clearance be more than 0.055 of an inch, replace the pin, check clearance and
then if still beyond tolerance, replace hooks. The gap between each hook should
be equal.
g. Repair of the landing gear is limited to reconditioning of parts such as
replacing components, bearings and bushings, smoothing out minor nicks and
scratches and repainting areas where paint has chipped or peeled.
7A-25.

INSTALLATION OF MAIN LANDING GEAR.

(Refer to Figure 7A-9.)

NOTE
When assembling components of the landing gear, lubricate bearings, bushings and friction surfaces with
proper lubricant as described in Section II.
a. Insert a gear support bearing (53 or 54) in each support fitting (1 or 16)
and secure with snap rings (2). Check bearing (53) for excess end play, shim as
necessary with shim washers (49) (P/N 62833-44).
b. The gear housing may be installed in the wheel well of the wing by the following procedure:
1. Place a spacer washer (52) and then the forward support fitting (16) on
the forward arm of the housing. Ascertain that the barrel nut (55) is positioned
in the arm and insert the attachment bolt through washer (51) and the fitting into
the arm. Tighten bolt and ascertain that the bearing is free to rotate.
2. Position the aft support fitting (1) at its attachment point in the wheel
well and secure with bolts, washers and nuts. Install the nuts and washers by
reaching through the access hole on the underside of the wing.
3. With the retainer tube (4) for the aft arm of the housing in hand, reach
up through the access opening and insert the tube into the support fitting (1)
through the hole in the web.
4. Position the gear housing up in the wheel well and install the forward
support fitting (16) bolts and washers.
(One each AN960-416 and AN960-416L
washer per bolt.)
5. Push the retainer tube into the arm of the housingand secure with bolt.

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LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEESERVICEMANUAL

6. Check that the gear rotates freely in its support fitings and recheck
thrust.

7. Connect the brake line to its mating line in the wheel well and bleed
brakes as given in paragraph 7A-73.
c. The gear side brace link assembly may be installed by the following procedure:
1.' Position the link support bracket (27) with swivel stud (26) installed at
its attachment point on the web of the spar and secure with bolts and washers.
NOTE

When installing a new wing, it will be necessary to
back drill two (2) holes 0.250 inch and countersink
100° x .499 through the spar cap. (Screw head should
be flush with spar). Use hole in the support bracket
as a guide in the drilling.
2. Ascertain that the upper and lower links(28 and 33)are assembled with
downlock hook (30), retraction fitting (21), etc. attached, and the through travel
of the links and downlock hook clearance checked according to paragraph 7A-24.
3. Attach the upper link to the swivel stud of the support fitting and secure.
with bolt, bushing, washer, nut and cotter pin.
4. The actuating cylinder rod end bearing (46) and lower side brace link
(33) may be attached respectively to the retraction fitting (21) and gear housing
during the adjustment of the landing gear.
d. Ascertain that the landing gear is lubricated per Lubrication Chart.
e. Check adjustment of the landing gear per paragraph 7A-26.
f. Check alignment of the wheel per paragraph.7A-27_
g. Install the access plate on the underside of the wingand remove the airplane
from jacks.
7A-26. ADJUSTMENT OF MAIN LANDING GEAR.
- a..Place the airplane on jacks. (Refer to Jacking, Section II.)
b. Level the airplane laterally and longitudinally. (Refer to Leveling, Section II.)
c. Disconnect the gear door actuating rods at either the door or the housing,
as desired, by removing the rod attachment bolt. Secure the door out of the way.

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d. Adjust the gear oleo housing to obtain a vertical position with the airplane
level (90 degrees to horizontal). To do this, set 90 degrees on a bubble protractor, place the protractoralong
the side of the gear piston tube and adjust the end
bearing of the lower side brace link allowing thebubble of the protractor to center
when the end bearing isconnected tothe gear housing. This shouldallow anangle
of 83 degrees between the gear housing and the spar cap of the wing. Place a bushing on each side of the end bearing and secure with bolt, washer and nut.
e. Check that the rod end has sufficient thread engagement in the end bearing,
align the flat sides of the bearing casting with the flat side of the bearing and
tighten the jam nut.
f. Adjust the turnbuckle of the downlock mechanism by first ascertaining that
the gear is down and locked, and then move the retraction fitting outboard until
it contacts the stop slot of the side brace link. Hold the fitting in this position
and turn the turnbuckle barreluntil the downlock hooks make contact with the lock
pin. Safety the turnbuckle.
g. For easier adjustment of the downlock limit switch, it may be set at this
time as given in paragraph 7A-36.
h. Retract and extend the gear manually several times to ascertain that the
side brace link falls through center, the downlock hook falls into position and
there is no binding of the gear assembly.
i. The gear should beadjustedin the upposition to allow the gear fork topress
lightly into the rubber bumper pad on the wing. The adjustment may be accomplished as follows:
NOTE
If it requires less than .025 of an inch to move the
gear into the correct adjustment, steps 2 and 6 thru
8 need only be followed.
1. Ascertain that the rod end bearing of the actuating cylinder is disconnected from the retraction fitting.
2. Actuate the hydraulic system to bring the hydraulic cylinder to the up
position by turning the master switch on, raising the emergency gear extension
lever and moving the gear selector handle to the up position. Retain the emergency extension lever in the up override position. The piston of the cylinder
should be bottomed.
3. Raise the gear by pushing up onthe retraction fitting, thus disengaging
the hooks, and pushing up on the pivot point at the bottom of the side brace links
to bring the links out of the locked position. Raise the gear until the fork presses
lightly into the rubber pad. Retain the gear in this position.

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.

RIVET

BRACKET

SKETCHB

Figure

Reissued: 1/15/81

A -10.

Aligning Main Gear

2110

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEESERVICE MANUAL.

4. Loosen the jam nut on the piston rod of the actuating cylinder and turn
the rod end bearing in or out to allow a slip fit of the attachment bolt.
5. Install with the attachment bolt, bushing, spring swivel and secure with
washer and nut. Install the gear downlock spring.
6. Whenthe gear is towithin .125 of aninch ofcorrect adjustment, the rod
end need not be disconnected and therefore all that will be required is to loosen
the jam nut, place a wrench on the flat at the endof the piston rod and turn to obtain correct adjustment.
7. Check the rod end bearing for adequate thread engagement and tighten
jam nut.
8. If the downlock limit switch is properlyadjusted, retract and extend the
gear hydro-electrically to ascertain that the gear operates properly.
7A-27. ALIGNMENT OF MAIN LANDING GEAR.
a. Place a straightedge no less than twelve feet long across the front of both
main landing gear wheels. Butt the straightedge against the tire at the hub level
of the landing gear wheels. Jack the airplane up just high enough to obtain a six
and one-half inch dimension between the centerline of the strut piston and the
.centerline of the center pivot bolt of the gear torque links. (Refer to Figure 7A- 10.)
Devise a support to hold the straightedge in this position.
b. Set a square against the straightedge and check to see if its outstanding leg
bears on the front and rear side of the brake disc. (It may be necessary to remove the brake assembly to have clear access to the disc.) (Refer to Figure
7A-10.) If it touches both forward and rear flange, the landing gear is correctly
aligned. The toe-in for the main landing gear wheels is 0 ± 1/2 degrees.
NOTE
A carpenter's square, because of its especially long
legs, is recommended for checking main landing gear
wheel alignment.
c. If the square contacts the rear side of the disc, leaving a gapbetween it and
the front flange, the wheel is toed-out. If a gap appears at the rear flange, the
wheel is toed-in.
d. To rectify the toe-in or toe-out condition, remove the bolt connecting the
upper and lower torque links and remove or add spacerwashers to move the wheel
in the desired direction. Refer to the chart on the following page.

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LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

TOE-IN TOE-IN
TOE -OUT
ANGLE

TOE-OUT CORRECTION CHART
.

SHIM
WASHERS

WASHERS
UNDER HEAD

.

WASHERS
UNDER NUT

AN' 174
BOLT

.

AN960-416

AN960-416 -(3)

-14

AN960-416

AN960-416

AN960-416 (2)

-14

AN960-416L
AN960-416

AN960-416

AN960-416

-14

1°04 '

AN960-416 (2)

AN960-416

AN960-416

-14

1°19 '

AN960 -416L
AN960-416 (2)

AN960-416L

AN960-416

-14

1°35 '

AN960-416 (3)

AN960-416

AN960-416 (2)

-15

2°05'
Max. Allow

AN960-416 (4)

AN960-416

AN960-416

-15

0

0033 '
0048

'

AN960-416L Washers .031 Thick
AN960-416 Washers .062 Thick
e. Should a condition exist that all spacer washers have been removed and it
is still necessary to move the wheel further in or out, then it will be necessary
to turn the torque link assembly over. This will put the link connecting point on
the opposite side allowing the use of spacers to go in the same direction.
f. Recheck wheel alignment. If the alignment is correct, safety the castellated
nut with cotter pin.
g. If a new link on the top left main gear had to be installed or it had to be re versed during the alignment check, it will bienecessary to check the gear safety
switch (squat switch) bracket for engagement and locking in place. If the large
machine surface of the link is inboard, the bracket is mountedwith the small rivet
hole next to link. (Refer to Sketch "A", Figure 7A-10) This should be aligned on
the centerline of link and a hole drilled to .096 of an inch, .15 of an inch deep.
Insert an MS20426AD3-3 rivet in the hole. This locking rivet is held in place by
the flat washer, castellated nut and cotter pin. If link has to be reversed, then
the bracket and bolt are-also reversed.
(Refer to Sketch "B", Figure 7A-10.)

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2112 LANDINGGEAR

AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

h. Check adjustment of landing gear safety switch (squat switch) per paragraph
7A-37.
7A-28. REMOVAL OF MAIN GEAR DOOR ASSEMBLY,
a. With the landing gear extended, disconnect the door retraction rod from the
door by removing nut, washers and bolt.
b. Remove the door from the wing panel bybending the door hinge pin straight
and from the other end pulling out the pin.
c. The door retraction rod may be removed from the gear housing by cutting
the safety wire and removing the attachment bolt and washer. Note the number
of washers between rod end bearing and housing.
7A-29. CLEANING, INSPECTION AND REPAIR OF MAIN GEAR DOOR ASSEMBLY.
a. Clean the door and retraction rod with a suitable cleaning solvent.
b. Inspect the door for cracks or damage, loose or damaged hinges and brackets.
c. Inspect the door retraction rod and end bearing for damage and corrosion.
d. Repairs to a door may be replacement of hinge, repair of fiberglass and
painting.

7A-30. INSTALLATION OF MAIN GEAR DOOR ASSEMBLY.
a. Install the door by positioning the hinge halves of the door and wing, and inserting the hinge pin. It is recommended a new pin be used. Bend the end of the
pin to secure in place.
b. Install the door retraction rod bypositioningthe rod at its attachment points
at the door and strut housing. At the door attachment, thin washers are inserted
at each side of the rod end bearing and it is secured with bolt, washer and nut.
At the strut housing, place washers between rod end bearing and housing not to
exceed . 12 of an inch to obtain proper clearance and secure with bolt. Safety bolt
with MS20995C41 wire.
c. Check that the all around clearance between the door and the wing skin is
not less than .032 of an inch.

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2I13

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

7A-31. ADJUSTMENT OF MAIN GEAR DOOR ASSEMBLY.
a. Place the airplane on jacks. (Refer to Jacking. Section II.)
b. Ascertain that the main gear is properly adjusted for gear up as given in paragraph
7A-26.

c. Adjust the retraction rod end at the door so that the,door will pull up tightly when
the gear is full up. Over-tightening may result in door buckling: however if the door is too
loose, it will gap in flight.
d. Check all rod ends for adequate thread engagement. for safety and tightness of
jam nuts.
e. Remove the airplane from jacks.
7A-32. LANDING GEAR LIMIT SWITCHES.
NOTE
All adjustments of the limit switches should be made with
the airplane on jacks. (Refer to Jacking. Section II.)
NOTE
Do not bend the actuator springs mounted on the limit
switches.
7A-33. ADJUSTMENT OF NOSE GEAR UP LIMIT SWITCH. The gear up limit switch is
mounted on a bracket on the engine mount above the point where the-right side of the upper
drag link attaches to the engine mount.
a. To facilitate adjustment of the limit switch. disconnect the gear doors or remove the
bottom cowl. as desired.
b. Retract the landing gear hydro-electrically by turning the master switch on.
raising the emergency gear extension lever and moving the gear selector handle to the up
position. Retain the emergency extension lever in the up position and turn the master switch
off.
c.' Block the nose gear in, the up position and then slowly release the emergency
extension lever. This will relieve hydraulic pressure and the main gears will drop.
d. Rig the nose gear up limit switch so that the switch activates when the nose gear is
within .12 of an inch of the full up position per rigging instructions given in paragraphs
7A-12 or 7A-13.

Revised: 4 23 84

2114

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEESERVICEMANUAL

A127

Figure 7A- 11. Adjustment of Nose
Gear Down Limit Switch

_

Figure 7A-12. Adjustment of Main
Gear Down Limit Switch

e. Loosen the attachment screws of the switch and rotate the switch toward
the actuator tang until it is heard to actuate. Retighten the attachment screws
of the switch.
f. Manually move the gear up and down only as far as necessary to ascertain
that the switch actuates at the correct position. Remove the block from under
the gear and allow it to slowly extend.
g. Retract the gear hydro-electrically
and ascertain that the yellow transit
light will go out when the gear has retracted and the pump has shut off.
7A-34. ADJUSTMENT OF NOSE GEAR DOWN LIMIT SWITCH. The gear down
limit switch is mounted on the horizontal support tube of the engine mount that
runs between the right attachment points of the gear housing and upper drag link.
a. Ascertain that the gear is down and locked.
b. The down limit switch should actuate only after the leading edge of the downlock hook, when moving to the locked position, has passed the downlock roller
by .06 of an inch. Refer to Figure 7A-11.) Position the hook at this location
in relation to the roller bymoving the actuator piston manually toward the up position. The downlock spring may be disconnected, if desired.
c. Loosen the attachment screws of the actuator located on the downlock hook
and move it toward the switch until it is heard to actuate. Retighten the actuator
screws.
d. Manually move the hook from the locked to the unlocked position and ascer-

Reissued:1/15/81

2I15

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

tain that the switch actuates at the correct location of the hook,
e. Retract and extend the gar hydro-electrically
by turning the master switch
on, raising the emergency gear extension lever and moving thegear selector handle to the up position. As the gear begins to retract the green light below the selector should go out and the yellow transit light at the top of the instrument panel
should come on.

7A -35. ADJUSTMENT OF MAIN GEAR UP LIMIT SWITCH.
A gear up limit switch is located in each wheel well above the gear door
hinge. There is no adjustment of these switches other than check that the gear,
when retracting, will actuate the switch within .88 of an inch of full up. Switch
operation turns the yellow transit light out.

.7A-36. ADJUSTMENT OF MAIN GEAR DOWN LIMIT SWITCH. A gear .down
limit switch is mounted on a bracket which is attached to the lower drag link of
each main gear. The switch should be adjusted to allow it to actuate thus turning
on the green indicator light within the cockpit when the downlock hook has entered
the locked position and is within .025 to .035 of an inch of contacting the downlock pin. (Refer to Figure 7A-12.) Adjustment of the switch may be as follows:
a. Ascertain that the main gear downlock is properly adjusted as described
in paragraph 7A-26.
b. Raise the airplane on jacks. (Refer to Jacing, Section II.)
c. Ascertain that the landing gear is down and pressure is relieved from the
hydraulic system. To relieve pressure, hold down the emergency extender lever.
d. Raise the downlock hook assembly and place a .030 of an inch feeler gauge
between the horizontal surface of the hook that is next to the switch (The surface
that contacts the downlock pin.) and the rounded surface of the pin. Lower the
hook and allow it to rest on the feeler gauge.
e. Loosen the attaching screws of the switch and, while pushing up on the
center of the link assembly, rotate the switch toward the hook until it is heard
to actuate. Retighten the attaching screws of the switch.
f. Manually move the hook assembly up from the pin until the hook nearly disengages from the pin. Then, with pressure against the bottom of the link assembly, move back to ascertain that the switch actuates within .025 to .035 of an
inch of full lock.
g. Retract and extend the gear hydro-electrically
by turningthe master switch
on, raising the emergency gear extension lever and moving the gear selector
handle to the up position. As the gear begins to retract, the green light below
the selector should go out and the yellow transit light at the top of the instrument
panel should come on.

Reissued: 1/ 15/81

2I16

LANDING GEAR AND BRAKE SYSTEM

)

3

a

G

u

O

oN

i*

I

.

O

u

.

o

6

'

.

PIPER CHEROKEE
SERVICEMANUAL

7A-37. ADJUSTMENTOF LANDINGGEAR SAFETY SWITCH(SQUATSWITCH).
The landing gear safety switch, located on the left main gear housing is adjusted
so that the switch is actuated within the last quarter of an inch of gear extension.
a. Compress the strut until 7.875 inches is obtained between thetop of the gear
fork and the bottom of the gear housing. Hold the gear at this measurement.
b. Adjust the switch down until it actuates at this point. Secure the switch.
c. Extend and then compress the strut to ascertain thatthe switch will actuate
within the last quarter of an inch of oleo extension.
7A-38. ADJUSTMENT OF GEAR BACK-UP EXTENDER ACTUATOR SWITCH.
The back-up gear extender actuator switch is mounted on the extender unit located
under the bottom section of the rear seat. Inasmuch as the switch is a component
of the back-up extender, instructions for the adjustment of the switch will be
found with the adjustment instructions for the extender as found in Section VI.
7A-39.

LANDING GEAR WARNING SWITCHES (THROTTLE SWITCHES).

7A-40. LANDINGGEAR UP/POWERREDUCED WARNINGSWITCH. The gear
up/power reduced warning switch (Switch "A") is within the control quadrant below the throttle control lever. (Refer to Figure 7A-14.) This switch will actuate
the warning horn and red light simultaneously when the landing gear is not down
and locked, and the throttle is reduced to and below 14 inches of manifold pressure.
7A-41. REMOVAL OF LANDING GEAR UP/POWER REDUCED WARNING
SWITCH.
a. Loosen the quadrant cover by removing the cover attaching screws from
each side and at the bottom of the cover.
b. Pull the cover aft enough to remove the screws that secure the reinforcing
clip to the top underside of the cover. Remove the cover.
c. Remove the switch from its mounting bracket by removing the switch attaching screws.
d. Disconnect the electrical leads from the switch.
7A-42. INSTALLATION OF LANDING GEAR UP/POWER REDUCED WARNING
SWITCH.
a. Connect the electrical leads to the switch.
b. Position the switch with actuator follower against its mounting bracket and

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2118

LANDING GEAR AND BRAKE SYSTEM

PIPERCHEROKEESERVICEMANUAL

PA-20R-180, SERIAL NOS.
28-0005 TO 28-30199 INCL.

P

.

Figure 7A-14. Throttle Warning Switches
secure with screws.
c. The switch may be adjusted at this time per instructions in paragraph 7A-43.
d. With the control levers aft, slide the quadrant cover into position around
the controls far enough to allow the cover reinforcement clip to be installed to
the top underside of the cover and secure with screws.
e. Install the cover and secure with screws.
7A-43. ADJUSTMENTOF LANDINGGEAR UP/POWER REDUCED WARNING
SWITCH.
a. Remove the control quadrant cover as given in paragraph 7A-41.
b. Flight test the airplane and at a safe altitude, establish a normal descent
with gear up and the propeller control at a desired low pitch setting.
c. Retard the throttle to a manifold pressure of approximately 14 inches.
This setting should be an airspeed above 110 MPH.
d. In some manner, mark the throttle lever in relation to its position next to
the mounting bracket.
e. With the airplane on the ground and the throttle positioned to the mark,
loosen the screws that secure the switch and rotate it toward the throttle until it
is heard to actuate. Retighten the switch attachment screws.
f. Advance and retard the throttle to ascertain that the switch actuates at the
desired throttle lever setting. The airplane mayalso be flown to ascertain that
the horn and light will actuate when the throttle is reduced below approximately
14 inches of manifold pressure with gear up.
g. Reinstall the quadrant cover as given in paragraph 7A-42.

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2119

LANDINGGEAR AND BRAKESYSTEM

PIPER CHEROKEESERVICEMANUAL

7A-44. GEAR DOWN/SELECTORHANDLE UPWARNING SWITCH. The gear
down/selector handle up warning switch (Switch "B") is located directly forward
of the instrument panel, below the arm of the throttle control lever. (Refer to
Figure 7A-14.) This switch will actuate the gear warning horn and light simultaneously when the gear selector handle is at the up position and the airplane is
on the ground or airspeed is below that required to close the hydraulic valve and
the pump switch of the back-up gear extender. The latter applies except at full
throttle.
7A-45. REMOVALOFGEARDOWN/SELECTORHANDLEUPWARNING
SWITCH.
a. Remove the switch from its mounting bracket by removing the switch attachment screws.
b. Disconnect the electrical leads from the switch.
NOTE
The switch with mounting bracket may be removed by
removing the control quadrant cover and removing the
two screws that secure the bracket.
7A-46. INSTALLATION OF GEAR DOWN/SELECTOR HANDLE UP WARNING
SWITCH.
a. Connect the electrical leads tothe switch. Leads attach to terminals C and
NC.
b. Position the switch against its mounting bracket and secure with attachment
bolts.
c. Adjust the switch as given in paragraph 7A-47.
7A-47-. ADJUSTMENT OF GEAR DOWN/SELECTOR HANDLE UP WARNING
SWITCH.
a. Loosen the quadrant cover by removing the cover attachment screws from
each side and at the bottom of the cover.
b. Pull the cover aft far enough to remove the screws that secure the reinforc ing clip to the top underside of the cover. Remove the cover.
c. Position the throttle control lever. 25 of an inch from its full forward stop.
d. Loosen the switch bracket attachment screw from the quadrant side and
move the bracket with switch toward the arm of the control lever until the switch
actuates.
Tighten the attachment screws.
e. Move aft and then forward to ascertain that the switch actuates at the .25

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2120 LANDING GEAR AND BRAKE SYSTEM

PIPERCHEROKEESERVICEMANUAL

of an inch dimension the throttle lever should still move approximately
an inch before it stops.
f. Reinstall the quadrant cover.
7A-48.

.125 of

WHEELS.

7A-49. REMOVAL AND DISASSEMBLY OF NOSE WHEEL. (RefertoFigure
7A-15.)
a. Jack the airplane enough to raise the nosewheelclearof
the ground. (Refer
to Jacking, Section II. )
b. To remove the nose wheel, first remove the cotter pin and washer that secures the safety clevis pin of the wheel nut. Next remove the clevis pin, wheel
nut and then slide the wheel from the axle.
c. The wheel halves (7 and 10) may be separated by first deflating the tire.
With the tire sufficiently deflated, remove the wheel through bolts (18). Pull the
wheel halves from the tire by removing the wheel half opposite the valve stem
first and then the other half.
d. The wheel bearing assemblies may be removed from each wheel half by first
removing the snap rings (1 or 16) that secure the grease seal retainers, and then
the retainers, grease seals (4 or 13) and bearing cones (6 or 12). The bearing
cups (5 or 11) should be removed by tapping out evenly from the inside.

7A-50. INSPECTION OF NOSE WHEEL ASSEMBLY.
a. Visually check all parts for cracks, distortion, defects and excess wear.
b. Check tie bolts for looseness or failure.
c. Check internal diameter of felt grease seals. Replace the felt grease seal
if surface is hard or gritty.
d. Check tire for cuts, internal bruises and deterioration.
e. Check bearing cones and cups for wear and pitting and relubricate.
f. Replace any wheel casting having visible cracks.
7A-51. ASSEMBLY AND INSTALLATION OF NOSE WHEEL. (Refer to Figure
7A-15.)
a. Ascertain that the bearing cup (5 or 11) for each wheel half (7 and 10) is
properly installed. Install the tire with tube on the wheel half with the valve stem
hole and then join the two wheel halves. Install the through bolts (18)with the
washers (9 and 17) and nuts (8) to the valve stem side.

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LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

Isea

NOTE
. I

NOSE
WHEEL
ON McCAULEY
ASSEMBIES ONLY, BUSHING (19) IS
TUBE
TO PREVENT
REQUIRED
MOVEMENT.
19

II

3
4

1. SNAP RING
2. RING. GREASE RETAINER
3. FELT RING
4. RING, GREASE SEAL
5. BEARING CUP
6. BEARING CONE
7. WHEEL HALF
8. NUT
9. WASHER
10. WHEEL HALF
11. BEARING CUP
12. BEARING CONE
13. RING, GREASE SEAL
14. FELT RING
15. RING. GREASE RETAINER
16. SNAP RING
17. WASHER
18. BOLT
19. RUBBER BUSHING

7

10

11

12
13
14

15

Figure 7A-15.

Nose Wheel Assembly
NOTE

On aircraft models which use the ClevelandWheelAssembly
torque nuts to 90 inch-pounds. Those aircraft models which
use the McCauley Wheel Assembly torque nuts to 140-150
inch-pounds.
b. Lubricate the bearing cones (6 and 12) and install the cones, grease seals (4 or 13),
felt rings (3 or 14) and seal retainer rings (2 or 15). Secure with snap rings (lor 16).
c. Slide the wheel on the axle and secure with retainer nut. Tighten nut to allow no
side play, yet allow the wheel to rotate freely. Safety the nut with clevispin and secure pin
with washer and cotter pin.

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2122

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEESERVICEMANUAL

1893

2.

SNAP RING
RING, GREASE RETAINER

FELT,
4.3. RING,
6.
7;
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.

RING SEAL
GREASE

BEARING CONE
WHEEL HALF, OUTER
WHEEL HALF, INNER
BEARING CUP
BEARING CONE
RING, GREASE SEAL
FELT RING
RING, GREASE RETAINER
SNAP RING
BRAKEDISC
BOLT
WASHERS
NUT

12
13

14

Figure 7A-16.
7A-52.

Main Wheel Assembly

REMOVAL AND DISASSEMBLY OF MAIN WHEEL.

(Refer to Figure

7A-16.)
a. Place the airplane on jacks. (Refer to Jacking, Section II.)
b. To remove the main wheel, remove the four cap bolts that join the brake
cylinder housing and the lining back plate assemblies. Remove the back plate
from between brake disc and wheel.
c. Remove the dust cover and the cotter pin that safeties the wheel nut, remove
the wheel nut and slide the wheel from the axle.
d. The wheel halves (7 and 8) may be separated by first deflating the tire.
With the tire sufficiently deflated, remove the wheel through bolts (16). Pull the
wheel halves from the tire by removing the inner half (8) from the tire first, and

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2123 LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEESERVICE MANUAL

then the outer half.
e. The wheel bearing assemblies may be removed
first removing the snap rings (1 or 14) that secure the
or 13), and then the retainers, grease seals (4 or 11) and
The bearing cups (5 or 9) should not be removed only for
removed by tapping out evenly from the inside.

from each wheel half by
grease seal retainers (2
bearing cones (6 or 10).
replacement and may be

7A-53. INSPECTION OF MAIN WHEELASSEMBLY. The inspection of the main
wheel is the same as that given for the nose wheel, paragraph 7A-50.
7A-54. ASSEMBLY AND INSTALLATION OF MAIN WHEEL. (Refer to Figure
7A- 16)
a. Ascertain that the bearing cup(5 or 9) foreach wheel is properly installed.
Install the tire with tube on the outer'wheel half (7) and then join the two wheel
halves. Position the brake disc (15) in the inner wheel half and install the through
bolts with the nuts on the valve stem side. Torque wheel nuts to 150 inch pounds
and inflate tire.
b. Lubricate the bearing cones (6 or 10) and install the cones, grease seals
(4 or 11), seal retainer rings (2 or 13) and felt rings (3 or 12). Secure with snap
rings (1 or 14).
c. Slide the wheel on the axle and secure with retainer nut. Tighten the nut
to allow no side play, yet allow the wheel to rotate freely. Safety the nut with a
cotter pin and install dust cover.
d. Position the brake lining back plates between the wheel and brake disc and
the brake cylinder on the torque plate. Insert the spacer blocksbetween the back
plates and cylinder, and install the four bolts to secure the assembly. If the brake
line was disconnected, reconnect the line and bleed the brakes.

7A-55.

BRAKE SYSTEM.

7A-56.

WHEEL BRAKE ASSEMBLY.

7A -57. BRAKE ADJUSTMENT AND LINING TOLERANCE. No adjustment of the
brake lining clearance is necessary as they are self adjusting. Inspection of the
lining is necessary, and it may be inspected visually while installed on the airplane. The linings are of the riveted type and should be replaced if the thickness
of any one segment becomes worn below .097 of an inch or unevenly worn.

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2124 LANDING GEAR AND BRAKE SYSTEM

PIPERCHEROKEESERVICEMANUAL

1726

2. . WASHER
3. CYLINDER

Figure7A-17.

the

lining

assemblies
backplate

(11

and

13).

Remove

Whee
the

5.

SHIM

6.

PISTON

LINING
PLATE
11.
12.BACK
RIVET
BACK
PLATE
13.
14. LINING
backplate
BOLT
ANCHOR

15.

17. "O"RING
18. PISTON
19.SEAT,
21.
22.

22

BLEEDER

CAP, BLEEDER
NUT

a. To remove the brake assembly, first- disconnect the brake line from the
brake cylinder at the tube fitting (4).
b. Remove the four cap bolts (1) that join the brake cylinder housing (3) and
the lining back plate assemblies (1 and 13). Remove the back plate from between
the brake disc and wheel.
c. Slide the brake cylinder housing (3) from the torque plate.
d. Remove pressure plate (8) by sliding it off anchor bolts (15) of the housing.
e. The pistons may be removed by injecting low air pressure in the cylinder
fluid inlet and forcing the pistons from the housing.

Reissued:1/15/81

2J 1

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

7A-59. CLEANING, INSPECTIONAND REPAIR OF WHEELBRAKE ASSEMBLIES.
a. Clean the assembly with a suitable solvent and dry thoroughly.
b. Check the walls of the cylinder housing and pistons for scratches, burrs, corrosion,
etc., that may damage "O" rings.
c. Check the genera condition of the brake bleeder screw andlines.
d. Check the brake disc for grooves. scratches, pits or coning. Coning beyond .015 in
either direction would because.for replacement. The minimum dimension of Disc 164-19
used on Wheel Assembly 40-84 is .227. and Disc 164-20used on Wheel Assembly 40-86B is
.205 (Referto Figure 7A-18.) A single groove or isolated grooves up to .031 of an inch deep
would not necessitate replacement, but a grooving of the entire surface would reduce lining
life.
braking applications to remove it. A heavier coating of rust may require removal of the disc
so that it may be wire-brushed and then sanded with 220 grit sandpaper.
e. Lining may be removed from the backing plates by drilling or punching out the old
rivets, and installing a new set using the proper rivets and a rivet set that willproperly stake
the lining and form a correct flair of the rivet..
f. After replacing brake linings, condition them by performing a minimum of six light
pedal effort braking applications from 25 to 40 MPH, allowing the brake discs to partially
cool between stops.
7A-60. ASSEMBLY AND INSTALLATION OF WHEEL BRAKE ASSEMBLY. (Refer to
Figure 7A-17.)
a. Lubricate the piston "O" rings (7 and 17) with fluid MIL-H-5606 and install on
pistons (6 and 18). Slide the pistons in cylinder housing until flush with surface of housing.
b. Slide the lining pressure plate (8) onto the anchor bolts(15) of the housing.
c. Slide the cylinder housing assembly on the torque plate of the gear.
d. Position the lining back plates (11 and 13) between the wheel and brake disc. Insert
the shim blocks (5) between the back plates and cylinder, and install the four bolts to secure
the assembly.
e. Connect the brake line to the brake cylinder housing.
f. Bleed the brake system as described in paragraph 7A-73.
7A-61. BRAKE MASTER CYLINDER(Hand Parking Brake).
7A-62. REMOVAL OF BRAKE MASTERCYLINDER. (Refer to Figure 7A 19.)
a. To remove the brake master cylinder (8) first disconnect the inlet supply line (13)
from the fitting at the top of the cylinder and allow fluid to drain from the reservoir and
line into a suitable container.
b. Disconnect the pressure line from the fitting at the bottom of the cylinder and allow
fluid to drain from the cylinder line.
c. Disconnect the end of the cylinder rod from the brake handle (6) by removing the
cotter pin that safeties the connecting clevis pin (12). Remove the clevis pin and spacer
washers.
d. Disconnect the base of the cylinder from its mounting bracket by removing the
attachment bolt assembly (11).

Revised: 10 3 83

2J2

LANDINGGEAR AND BRAKE SYSTEEM

PIPER CHEROKEE SERVICE MANUAL

C343

MINIMUM

THICKNESS WHEELASSEMBLY
227
205

MINIMUM THICKNESS

40-84
40-86B

MEASURE2 OR 3 POINTSTO GET AVERAGE
DISC THICKNESSS

Figure 7A-18. Brake Disc Minimum Thickness

1739

7/
1.BRAKE RESERVED
2.

RIGHT

BRAKE

AND RUDDER

PEGS
BRAKE
ANDRUDDER
RIGHTBRAKE CLINDER
4.
5. LEFT BRAKE CYLINDER
6. BRKE HANDLE
7. HANDLE RELEASE BUTTON
8. MASTER CLINDER ASSEMBLY
3.

10.
11.
12.
13.

10-

LEFT

RUDDER PEDAL PADS
BOLT ASSEMBLY
CLEVIS PIN
LINE. INLET

Figure 7A-19. Brake System Installation

Revised: 10 3 83

2J3

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

e. The handle assembly (6) may be removed by removing the attachment bolt
assembly that secures the handle to its mounting bracket.

7A-63. DISASSEMBLY OF BRAKE MASTER CYLINDER. (Refer to Figure 7A-20.)
a. Remove the cylinder from its mounting bracket as per paragraph 7A-62.
b. To disassemble the cylinder, first remove the piston rod assembly by removing the snap ring (11) from the annular slot at the rod end of the cylinder.
Draw the piston rod assembly from the cylinder.
c. The piston rod assembly may be disassembled by first removing the small
snap ring (2) securing the retainer bushing (3), spring (4), piston (6), seal (7),
gland (9) and if desired, the large return spring.
d. Remove the "O" rings from the piston and gland.

7A-64. CLEANING, INSPECTION AND REPAIR OF BRAKEMASTER CYLINDER.
a. Clean the cylinder parts with a suitable solvent and dry thoroughly.
b. Inspect the interior walls of the cylinder, for scratches, burrs, corrosion,
etc.

c. Inspect the general condition of the fitting threads of the cylinder.
d. Check the piston and valve for scratches, burrs, corrosion, etc.
e. Repairs to the cylinder are limitedtopolishing out smallscratches,
etc. and replacing valve washer seal and "O" rings.

burrs,

7A-65. ASSEMBLY OF BRAKE MASTER CYLINDER. (Refer to Figure 7A-20.)
NOTE
Use a small amount of hydraulic fluid (MIL-H-5606)
on the "O" ring and component parts to prevent damage
and ease of handling during reassembly.
a. Install new "O" rings on the inside and outside of the packing gland (9) and
on the outside of the piston (6). (When installing teflon "O" ring (5) on piston, it
is recommended that it be installed withthe use of a cone placed against the piston. The cone may be constructed of plastic or metal with dimensions shown in
Figure 7A-20.)
b. To assemble the piston rod assembly, install on the rod (12), in order, the
return spring retainer washer (15), return spring(13), packing gland (9) with "O"
rings, seal (10), piston (6) with "O" ring, spring (4) and retainer bushing (3).
Secure these pieces with the small ring (2) on the end of the rod.

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2J4

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEESERVICE MANUAL

A349
889

COUNTERBORE
562 DIA 0625 DEEP

745

312

0 11

12

13

14

15

193
75

.

1 HOUSING
2 SNAP RING

3 BUSHING RETAINER
4

SPRING

5 O RING

6 PISTON
7 DYNASEAL
8 O-RING
9 GLAND.PACKING
10 O-RING

11 SNAP RING

12 ROD PISTON
13 SRING RETAINING
14 ROLLPIN
15 WASHER

Figure 7A-20. Brake Master Cylinder (Hand Parking Brake)
c.
d.

Insert the piston rod assembly in the cylinder (1) and secure packing gland with snap ring (11).
Install the cylinder per Paragraph 7A-67.

A-66. INSTALLATION OF BRAKE MASTER CYLINDER. (Refer to Figure 7A-19.)
a. Install the brake handle assemblybetween its mounting bracket and secure with bolt. washers. nut
and cotter pin. Washers should be placed on each side of the handle, betweenthe bracket. and under the nut.
b. Place the cylinder (8) between the mounting bracket and secure the base end with bolt, washers.
nut and cotter pin. This too should have washers placed on each side of the cylinder and under the nut.
c. Connect the rod end of the cylinder to the brake handle with a clevispin and thin washers. Safety
the clevis with a cotter pin.
d. Connect the pressure line to the fitting at the bottom of the cylinder.
e. Connect the inlet supply line (13) to the fitting at the top of the cylinder and secure with spring
clamp.
f.
Bleed the brake system per Paragraph 7A-73.

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2J5

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MAN UAL

1684
1. ARM, RUDDER CABLE
2. ARM, RUDDER CABLE
3.
ARM, TRIM CONTROL
4. CLEVIS PIN, WASHER
5. CLEVIS ASSEMBLY
6. CLEVIS PIN
7. ARM, IDLER
8. JAM NUT

ATTACHMENT
ATTACHMENT
ATTACHMENT
& COTTER PIN

1
.

1

Figure 7A-21. Toe Brake Installation

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LANDINGGEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

7A-67. BRAKECYLINDER(Toe Brake).
7A-68. REMOVALOF BRAKECYLINDER. (Refer to Figure 7A-21.)
a. Disconnect the upper and lower lines from the cylinder (14) to be removed and cap
the lines to prevent fluid leakage or drain the fluid from the brake reservoir and master
cylinder.
b. Remove the cylinder from its attachment fittings by first removing cotter pins that
safety the cylinder attaching pins (16) and then removingthe pins.
7A-69. DISASSEMBLYOF BRAKECYLINDER.
a. Clevelandcylinder number 10-20. (Refer to Figure 7A-22.)
1. Remove the cylinder from its mounting bracket as per paragraph 7A-68.
2. To disassemble the cylinder, first remove the piston rod assemblyby unscrewing
the packing gland (9) from the cylinder. Draw the piston rod assembly from the cylinder.
3. The piston rod assembly may be disassembledby first removing the small snap
ring (2) securing the retainer bushing (3) and then removing the bushing, spring (4), piston
(5), seal (7), gland (9). and, if desired, the large return spring (12).
4. Remove the "O" rings from the piston and gland.
b. Clevelandcylinder number 10-27. (Refer to Figure 7A-22.)
1. Removethe cylinder from its mounting bracket per paragraph 7A-68.
2. To disassemble the cylinder, first remove the piston rod assembly by removing
the snap ring (10) from the annular slot in the cylinder housing (1). Draw the piston rod
assembly from the cylinder.
3. The piston rod assembly may be disassembledby first removing the roll pin (12)
and then the piston assembly (3), seal (5). and packing gland (7).
4. Remove the O-ringsfrom the piston and packing gland.
c. Cleveland cylinder number 10-30.(Refer to Figure 7A-23.)
1. Remove the cylinder from its mounting bracket per Paragraph 7A-68.
2. To disassemblethe cylinder, first remove the piston rod assemblyby removing the
retaining ring from the annular slot in the cylinder housing (1). Draw the piston rod assembly
from the cylinder.
3. The piston rod assembly may be disassembled by first removing the retaining
ring (2), sleeve(3), spring (4), and then the piston assembly, O-ring(5), and gland (8), and, if
desired, the return spring (13).
4. Remove the O-ringsfrom the piston and packing gland.
d. Gar-Kenyon cylinder number 17000. (Refer to Figure 7A-22.)
1. Remove the cylinder from its mounting bracket as per Paragraph 7A-68.
2. To disassemble the cylinder, first remove the piston rod assembly by unscrewing
the fitting (8) from the cylinder.
3. The piston rod assembly may be disassembled by first removing the retaining
ring (2) securingthe sleeve(3) and then removing the spring (4), piston (6), seal (7), fitting (8),
and, if desired, the large return spring (11).
4. Remove the O-rings from the piston and fitting.

Reissued:1/15/81

2J7

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

C344

14

15
14

13
12

13

10-27

10-20

17000

11
10

10
8

5

1. HYDRAULIC
CYLINDER
2. SNAP RING
3. BUSHING
4. SPRING
5. PISTON
6. "O" RING
7. DYNA-SEAL
WASHER
8. "O" RING
9. PACKING GLAND
10. "O" RING
11. PISTON ROD
12. SPRING
13. DELETED
14. WASHER
15. ROLL PIN

5

6. "O" RING

4

1. HYDRAULIC

3

2. SPRING
3. PISTON
4. "O" RING
5. SEAL WASHER
6. "O" RING
7. PACKING GLAND
8. "O" RING
9. WIPER WASHER
10. RETAINING RING
11.SPRING
1
12. ROLL PIN
13. PISTON ROD
14. WASHER
15. ROLL PIN

3
2

1. HOUSING
2. RETAINING RING
3. SLEEVE
4. SPRING

1

5.
6.
7.
8.
9.
10.
11.
12.
13.
14.

"O" RING
PISTON
SEAL
FITTING
"O" RING
"O" RING
SPRING
PISTON ROD
WASHER
ROLL PIN

2
1

Figure 7A-22. Toe Brake Cylinders
7A-70. CLEANING, INSPECTIONAND REPAIR OF BRAKE CYLINDER.
a. Clean the cylinder parts with a suitable solvent and dry thoroughly.
b. Inspect the interior walls of the cylinder for scratches, burrs, corrosion, etc.
c. Inspect the general condition of the fitting threads of the cylinder.
d. Check the piston and valve for scratches, burrs, corrosion, etc.
e. Repairs to the cylinder are limited to polishing out small scratches, burrs, etc., and
replacing valve, washer, seal, and "0" rings.

Reissued: 1/15/81

2J 8

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEESERVICEMANUAL
7A-71. ASSEMBLYOF BRAKECYLINDER.
a. Clevelandcylinder number 10-20. (Refer to Figure 7A-22.)
NOTE
Use a small amount of hydraulic fluid (MIL-H-5606)on the
"O" ring and component parts to prevent damage and ease of
handling during reassembly.
1. Install new "O" rings on the inside and outside of the packing gland (9) and on
the outside of the piston (5).
2. To assemble the piston rod assembly, install on the rod (11), in order, the roll
pin (15), return spring retainer washer (14), return spring (12), packing gland (9) with "O"
rings, seal (7), piston (5) with "O" ring, spring (4) and retainer bushing (3). Secure these
pieces with the small ring (2) on the end of the rod.
3. Insert the piston rod assemblyin the cylinder (1) and secure packing (9).
4. Install the cylinder per paragraph 7A-72.
b. Clevelandcylinder number 10-27. (Refer to Figure 7A-22.)
NOTE
Use a small amount of hydraulic fluid (MIL-H-5606)on the
"O" ring and component parts to prevent damage and ease of
handling during reassembly.
1. Install new "O" rings on the inside and outside of the packing gland (7) and on
the outside of the piston (3).
2. To assemble the piston rod assembly, install on the rod (13), in order, the roll
pin (15), washer (14), spring (11), washer (9), packing gland (7), seal (5), piston assembly
(3) and spring (2), and roll pin (12).
3. Insert the piston rod assembly in the cylinder (1) and secure with the snap ring
(10).
4. Install the cylinder per paragraph 7A-72.
c. Cleveland cylinder number 10-30.(Refer to Figure 7A-23.)
1. Install new O-rings on the inside and outside of the packing gland (7) and on the
outside of the piston (3).
2. To assemble the piston rod assembly, install on the rod (12), in order, the roll
pin (14), washer (13), spring (11), washer (9), packing gland (7) with O-rings, seal (5), piston
assembly (3) with O-ring, spring (2), and roll pin (15).
3. Insert the piston rod assembly in the cylinder (1) and secure with the retaining
ring (10).
4. Install the cylinder per Paragraph 7A:72.
d. Gar-Kenyon cylinder number 17000.(Refer to Figure 7A-22.)
1. Install new O-rings on the inside and outside of the fitting (8) and on the outside
of the piston (6). (Refer to above note.)
2. To assemble the piston rod assembly, install on the rod (12), in order, the roll
pin (14), return spring retainer washer (13), return spring (11), fitting (8)with O-rings, seal (7),
piston (6) with O-ring, spring (4) and sleeve(3). Secure these pieces with the retaining ring (2)
on the end of the rod.
3. Insert the piston rod assembly in the cylinder (1) and secure fitting (8).
4. Install the cylinder per Paragraph 7A-72.

Reissued: 1/15/81

2J9

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

7A-72. INSTALLATIONOF BRAKE CYLINDER. (Referto Figure 7A-21.)
a. Position the cylinder (14) at its mounting points and attach with clevis pin. Safety
the pins with cotter pins. (See 16, Figure 7A-21.)
b. Connect the brake lines to the cylinder fittings.
c. Bleed the brakes per Paragraph 7A-73.
7A-73. BLEEDINGPROCEDURE. When it becomes necessary to bleed the brake system,
refer to Section VII, paragraphs 7-52 through 7-55.
7A-74. BEARING REPLACEMENT. (Refer to Figure 7A-25.) When it becomes necessary
to replace a bearing in any link attachment housing, follow instructions listed below:
a. Remove bearings being replaced.
NOTE
An individual bearing can be removed and replaced only if
existing boss includes the .089 grease hole (noted in
illustration). If existing boss does not include the .089 grease
hole, both bearings on a boss must be removed and the .089
greasehole added before installing the new bearings.
C343

1.
2.
3.
4..

HOUSING
RETAINING
SLEEVE .
SPRING

RING

5.
6.
7.
8.

O-RING
PISTON
O-RING
GLAND

9.
10.
11.
12.

O-RING
O-RING
WASHER WIPER
ROD

13. SPRING
14. WASHER
15. ROLL PIN

Figure 7A-23. Brake Cylinder
(10-30) (Toe Brake)

Revised: 10 3 83

2J 10

LANDINGGEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

b. Addition of the grease hole is accomplished by drilling a .089 hole centered on the
boss as shown in the illustration. After drilling hole, deburr any rough edges and clean out
any shavings that accumulate inside the boss hole.
c. Press fit new bearing(s) P/N 67026-07 tight against boss and line ream bearing(s) to
.31 dimension.
d. The .089 grease holes will require a needle type adapter on the greasegun nozzle.

1738

.089 Grease Hole
Boss
Bearing - 67026-07 (press fit) (2 Req.)
Line Ream .314

Boss

.089 Grease Hole
Typical Bearing Installation

Nose Gear Assembly

Main Gear Assembly

Figure 7A-24. Bearing Installation

Reissued: 1/15/81

2J11

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICEMANUAL

TABLE VILA-I. LANDING GEAR TROUBLESHOOTING
Trouble

Cause

Yellow transit light out
while gear is in transit.

Indicator lamp burned
out.

Replace lamp.

Indicator light ground
incomplete.

Check ground circuit.

Indicator light circuit
wire broken.

Check wiring.

Indicator light circuit
breaker open.

Reset circuit breaker
and determine cause
for open circuit
breaker.

One or more up limit
switches failed.

Isolate and replace
switch.

Nose gear up limit
switch out of adjustment.

Check gear up adjustment and readjust up
limit switch.

Main gear not retracting far enough
to actuate switch.

Check gear up adjustment.

One or more down limit
switches failed.

Isolate and replace
switch.

Nose gear down limit
switch out of adjustment.

Readjust down limit
switch.

Yellow transit light on
though gear has retracted.

Yellow transit light on
though gear is down
and locked.

Reissued: 1/15/81

2J12

Remedy

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROkEE SERVICE MANUAL

TABLE VIIA-I.
Trouble
Yellow transit light on
though gear is down
and locked. (cont)

LANDINGGEAR TROUBLESHOOTING(cont)
Cause

Remedy

Main gear down limit
switch out of adjustment.

Readjust down limit
switch.

NOTE
The out of adjustment or failed switch may be determined by noting which down light is not lit.
Yellow transit light
operates on and off
after gear has retracted.

Yellow transit light out
and one green gear
down light out though
gear is down and locked.

Light circuit wire
loose.

Check wiring.

Hydraulic system
losing pressure.

Refer to Hydraulic
System Section VI..

Gear up switch out of
adjustment.

Check gear up adjustment and then switch
adjustment.

Lamp burned out.

Replace lamp.

Gear down limit switch
failed.

Replace switch.

Light circuit wire
broken.

Check wiring.

NOTE
Ascertain navigation
lights are off (daytime).

Reissued: 1/15/81

2J13

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEESERVICE MANUAL

TABLE VIIA-I.
Trouble

LANDINGGEAR TROUBLESHOOTING (cont)
Cause

Remedy

Indicator lights circuit
breaker open.

Reset circuit breaker
and determine cause
for open circuit
breaker.

Ascertain navigation
lights are off (daytime).

Light circuit wire
broken.

Check wiring.

Green gear down lights
dim though position
light switch is off, and
gear is down and locked.

Failed instrument panel
light control switch.
(Lights grounding
through dimming resis tor instead of instrument
panel light control.)

Replace switch.

Green gear down light
fails to go outwith gear
in transit or retracted.

Gear down limit switch
failed.

Replace switch.

Green gear down lights
will go out and not dim
when position light
switch is turned on
though gear is down
and locked.

Green light ground
dimming resistor
open.

Replace resistor.

Gear warning light and
horn fail to operate
when throttle is near
closed and landing gear
is retracted.

Landing gear selector
circuit breaker open.

Reset circuit breaker
and determine cause
for open circuit
breaker.

Micro switch "A" at
throttle out of
adjustment.

Adjust micro switch

Transit yellow light and
all green lights out.
NOTE

Reissued: 1/15/81

2J14

"A".

LANDINGGEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL

TABLE VIIA-I.
Trouble
Gear warning light and
horn fail to operate
when throttle is near
closed and landing gear
is retracted (cont).

LANDING GEAR TROUBLESHOOTING (cont)
Cause

Remedy

Micro switch "A" failed.

Replace switch.

Warning horn and light
circuit wire broken.

Check wiring.

Diode in circuit between
throttle switch "A" and
light/horn open.

Replace diode.
NOTE
When replacing diode,
connect banded end
(cathode) to terminal
ends of wires G2R,
G2Q and G2K on mounting block.

Gear warning light and
horn fail to stop when
throttle is closed and
gear has extended.
(Gear extended through
the use of the free fall
lever or lack of air
speed.

Gear selector handle
in up position.

Place handle in down
position.

Warning light and horn
fail to operate when
selector switch is
moved to up position
with gear extended
and throttle not full
forward.

Warning light and horn
circuit wire broken.

Check wiring.

Reissued: 1/15/81

2J15

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEESERVICE MANUAL

TABLE VIIA-I.

LANDING GEAR TROUBLESHOOTING (cont)
Cause

Trouble

Remedy
Replace switch.

Above condition on
ground.

Defective safety (squat)
switch.

Above condition in
the air.

Pressure

Warning light and horn
fail to shut off at full
throttle. Gear selector at up position and
gear extended.

Throttle micro swich
"B" out of adjustment.

Adjust switch.

Throttle micro switch
"B" failed.

Replace switch.

Hydraulic pump shuts
off, but gear yellow,
in transit, light remains on.

Gear not fully retracted.

Determine cause and
remedy.

Landing gear doors
fail to completely
close.

Landing gear not retracting completely.

Check adjustment of
landing gear.

Door retraction rods
out of adjustment.

Check adjustment door
retraction rods.

Internal wear in shimmy
dampener.

Replace shimmy
dampener.

Shimmy dampener or
bracket loose at
mounting.

Replace necessary
parts and bolts.

Nose landing gear
shimmies during fast
taxi, take-off, or
landing.

Reissued: 1/15/81

switch open.

2J16 .

Replace switch.

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEESERVICEMANUAL.

TABLE VIIA-I.
Trouble
Nose landing gear
shimmies during fast
taxi, take-off, or
landing (cont).

Excessive or uneven
wear on nose tire.

Nose gear fails to
steer properly.

LANDING GEAR TROUBLESHOOTING (cont)
Cause

Remedy

Tire out of balance.

Check balance and replace tire if necessary.

Worn or loose wheel
bearings.

Replace and/or adjust
wheel bearings.

Worn torque link bolts
and/or bushings.

Replace bolts and/or
bushings.

Incorrect operating
pressure.

Inflate tire to correct
pressure.

Wear resulting from
shimmy.

Refer to proceedings
for correction.

Oleo cylinder binding
in strut housing.

Lubricate strut housing
(Refer to Lubrication
Chart).
Cylinder and/or strut
housing bushings
damaged.

Reissued:1/15/81

One brake dragging.

Determine cause and
correct.

Steering arm roller
sheared at top of
strut.

Replace defective
roller.

2J17

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEESERVICE MANUAL

(cont)
TABLEVIIA-I. LANDINGGEARTROUBLESHOOTING
Trouble
Nose gear fails to
steer properly (cont).

Nose gear fails to
straighten when
landing gear extends.

Nose gear fails to
straighten when
landing gear retracts.

Main landing shimmies
during fast taxi, takeoff, or landing.

Reissued: 1/15/81

Cause

Remedy

Steering bellcrank loose
on attachment plate.

Readjust and tighten.

Steering bellcrank bearing and/or bolt worn.

Replace bearing and/or
bolt.

Shimmy dampener
galling or binding.

Replace.

Steering arm roller
sheared at top of
strut.

Replace defective
roller.

Incorrect rigging of
nose gear steering.,

Check nose gear steering adjustment.

Centering guide roller
sheared.

Replace roller.

Damaged guide.

Replace guide.

Tire out of balance.

Check balance and replace tire if necessary.

Worn or loose wheel
bearings.

Replace and/or adjust
wheel bearings.

Worn torque link bolts
and/or bushings.

Replace bolts and/or
bushings.

2J18

LANDING GEAR AND BRAKE SYSTEM

PIPER CHEROKEE SERVICE MANUAL.

TABLE VIIA-I.
Trouble

Excessive or uneven
wear on main tires.

Strut bottoms on
normal landing or
taxiing on rough
ground.

Reissued: 1/15/81

LANDING GEAR TROUBLESHOOTING (cont)
Cause

Remedy

Incorrect operating
pressure.

Inflate tire to correct
pressure.

Wheel out of alignment
(toe in or out).

Check wheel alignment.

Lower side brace link
out of adjustment,
allowing gear to slant
in or out.

Check gear adjustment.

Insufficient air and/or
fluid in strut.

Service strut with air
and/or fluid.

Defective internal parts
in strut.

Replace defective parts.

LANDING GEAR AND BRAKE SYSTEM

2J19

PIPER CHEROKEE SERVICE MANUAL
7A-75. NOSE GEAR SERVICE TOLERANCES.
1770

24.225 1.2

1.2

7-8
11-12
13-14
11-12

3.4

5
9-10

6
19

15-16
19

1718

20-21
19
22-23
19
19

Figure 7A-25. Nose Gear Service Tolerances, PA-28R

Revised: 10 383

2J20.

LANDINGGEAR AND BRAKE SYSTEM

Bu
uo!

LL

6

L

9

dn

pue 6L80
0

s

S3

OO

pue

(

06

u

6

8

LL

9
6u
91
S

S
S

L

PIPER CHEROKEE SERVICE MANUAL
I

7A-76. MAIN GEAR SERVICE TOLERANCES.
3056

NOTE
WHEN BUSHINGS14843-16
(NO. 8 OR 11) ARE TO BE
REPLACED,THEYSHOULD
BE LINE REAMED TO
.376/.375. THE BUSHINGS
SHOULD BE A PRESS FIT,
HOWEVER, IF THEY ARE
LOOSE THEY MAY BE INSTALLEDUSING LOCTITE.

Figure 7A-26. Main Gear Service Tolerances, PA-28R

Revised: 10 3 83

2J23

LANDINGGEAR AND BRAKE SYSTEM

18

00
a
(
9
(
06

Z

9
(

LL

06
(S
6
9L
(

06

S9

8

Z SZ

L

00-

9
6

00

0
SOS
00
6

99!
s

uo

S33MOi

68`

Z-S
'

.
N '6!d

18/

09

(

000

(

OLE

OO

OL
Alq

uo
O

O
O-9
(

ap

86

8L

uo

66

ap

9L
a

(

6L

SECTION VIII
POWERPLANT
(PA-28-140,-150, -160,-180, -235)
Paragraph
8-1.
8-2.
8-3.
8-4.
8-5.

8-13.

8-17.

8-23.
8-24.
8-25.
8-26.

8-31.

Aerofiche
Grid No.
Introduction...............................................................................................
2K4
Description.....
..............................................................................
2K4
StandardPractices-Engine.........................................................................2K6
Troubleshooting.........................................................................................
2K6
Propeller...................................................................................................
2K7
8-6.
Removalof Propeller(FixedPitch)..................................
2K7
8-7.
Cleaning.Inspectionand Repair of Propeller...................2K7
2K7
Installationof Propeller(FixedPitch)...............................
8-8.
Removalof Propeller(ConstantSpeed)...........................2K10
8-9.
8-10.
Cleaning,Inspectionand Repairof Propeller
2K 0
(ConstantSpeed)........................................................
8-11.
InstallingPropeller(ConstantSpeed) ...............................
2K11
2K11
8-12.
Blade Track......................................................................
2K 12
PropellerGovernor..................................................................................
8-14.
Removalof PropellerGovernor........................................
2K 12
2K 2
Installationof PropellerGovernor....................................
8-15.
8-16.
Riggingand Adjustmentof PropellerGovernor
2K 2
................................................................
(PA-28-235)
Engine.........................................................................................................K14
8-17a.
Removalof EngineCowlings........................................2K14
2K 4
8-17b.
Installationof EngineCowlings........................................
Installationof Bushingsand Pins for FiberglasType
8-17c.
2K14
Cowlings...................................................................
8-18.
Removalof Engine(PA-28-140,-150, -160, -180)...........2K4
8-19.
Installationof Engine(PA-28-140,-150, -160, -180).......2K15
8-20.
Installationof EngineShockMounts
(PA-28-140,SerialNos. 28-2500and up) ..................2K19
8-21.
Removalof Engine(PA-28-235).......................................2K20
2K21
8-22.
Installationof Engine(PA-28-235)...................................
Installationof Oil Cooler............................................................................2K23
Adjustmentof Throttleand MixtureControls............................................2K
3
Adjustmentof Throttle and MixtureControls............................................2K24
Carburetor..................................................................................................2L2
2L2
CarburetorMaintenance....................................................
8-27.
8-28
ThrottleArm.....................................................................
2L2
Adjustmentof Idle Mixture...............................................2L2
8-29.
8-30.
Adjustmentof Idle Speed..................................................2L4
2L4
Magneto(Bendix)......................................................................................
2L4
8-32.
Inspectionof Magnetos.....................................................
2L6
8-33.
Removalof Magnetos.......................................................
8-34.
TimingProcedure..............................................................2L7
8-35.
Installationand TimingProcedure...................................2L9

Interim Revision: February 15, 1995

2K2

Aerofiche
Grid No.

Paragraph
8-36.
8-37.

8-41.

8-45.
8-47.

.........................
Magneto (Slick) .....................
Harness Assembly .....................................
Inspection of Harness ................................
8-38.
Removal of Harness .................................
8-39.
Installation of Harness ...............................
8-40.
Spark Plugs .......................................
Removal of Spark Plugs ..............................
8-42.
Inspection and Cleaning of Spark Plugs ................
8-43.
of Spark Plugs ............................
Installation
8-44.
Lubrication System ...........................................
Oil Pressure Relief Valve .............................
8-46.
Switching ...................................................
Removal of Ignition Switch ...........................
8-48.
Installation of Ignition Switch .........................
8-49.

Revised: 83 81

2K3

.

2L1
2L II
2L 11
2L 11`
2L12
2L12
2L12
2L 14
2L14
2L14
2L14
2L15
2L15
2L 15

PIPER CHEROKEE SERVICE MANUAL

SECTION VIII
POWER PLANT
(PA-28-140,-150,-160,-180,-235)

8-1. INTRODUCTION. This section covers the power plants used in PA-28-140,-150. -160,
-180, -235 airplanes, and is comprised of instructions for the removal and installation, minor
repairs, and service of the propeller, propeller governor, engine, induction system components, ignition system components and lubrication system.
For further instructions and for major repairs, consult the appropriate publication of the
engine or component manufacturer.

8-2. DESCRIPTION. The PA-28 Cherokee is powered by an Avco-Lycoming engine of
either 150, 160, 180, or 235 horsepower. (Refer to Power Plant Specifications in Table II-I.)
Engines are 0-320 and 0-360 series which are four-cylinder units and 0-540 series which are
six-cylinder units. All are wet sump, horizontally opposed, direct drive, air-cooled engines.
The cylinders are not directly opposed from each other but are staggered, thus permitting a
separate throw on the crankshaft for each connecting rod.
The cylinders are of conventional air-cooled design with the two major parts, head and
barrel, screwed and shrunk together. The heads are made from an aluminum alloy castingwith
a fully machined combustion chamber. The cylinder barrel, which is machinedfrom a chrome
nickel molybdenum steel forging with deep integral cooling fins, is ground and honed to a
specified finish. Standard engines are furnished with unplated cylinder barrels and chrome
plated piston rings. Engines manufactured with optional chrome plated barrels require
unplated piston rings.
The propellers installed on the PA-28-140,-150,-160,-180 are Sensenichfixed pitch type.
The PA-28-235 may be equipped with either Sensenich or McCauley fixed pitch propellers or
as an option, may be equipped with a Hartzell constant speed unit. The constant speed propeller utilizes oil pressure from a governor to move the blades into high pitch (reduced rpm).
The centrifugal twisting moment of the blades tend to move them into low pitch (high rpm) in
the absence of governor oil pressure.
The induction system on these engines consists of a dry type air filter, a Marvel-Schebler
MA-4SPA or MA-4-5 float type carburetor and Bendix electric pulsating plunger type fuel
pumps. Engines are normally aspirated with no restrictions on maximum power output.

Reissued: 1/15/81

2K4

POWER PLANT

PIPER CHEROKEESERVICE MANUAL

The magnetos used on these engines may be either Bendix-ScintillaS-20 or S-200 series
or Slick 4000 series. The Bendix series magnetos are installed with their associated
components. This magneto system consists of two single contact magnetos with the left
magneto incorporating an impulse coupling to aid in starting. These are serviceable units.
The Slick series magnetos are installed with their associated components. Refer to the latest
revision of Lycoming Service Letter No. SL-L177 for Slick exchange policy. These magnetos
are non-serviceable,sealed units.
In addition to the previously mentioned components, each engine is furnished with a
starter, 35 ampere or 60 ampere output, 14-voltelectrical system, shielded ignition, vacuum
pump drive and fuel pump. The exhaust system is stainless steel with a large muffler or two
small mufflers and a shroud is provided to supply heat for both the cabin and carburetor.
The lubrication system is of the pressure wet sump type. The oil pump, which is located
in the accessory housing, draws oil through a drilled passage leading from the oil suction
screen located in the sump. The oil from the pump then enters a drilled passage in the
accessory housing, which feeds the oil to a threaded connection on the rear face of the
accessory housing, where a flexible line leads the oil to the external oil cooler. Pressure oil
from the cooler returns to a second threaded connection on the accessory housing from
which point a drilled passage conducts oil to the oil pressure screen or filter. In the event
that cold oil or an obstruction should restrict the oil flow to the cooler, an oil bypass valve
is provided to pass the oil directly from the oil pump to the oil pressure screen or filter.
The oil pressure screen or filter element, located on the accessoryhousing is provided as
a means to filter from the oil any solid particles that may have passed through the suction
screen in the sump. After being filtered in the pressure screen or filter, the oil is fed through
a drilled passage to the oil pressure relief valve, located in the upper right side of the
crankcase in front of the accessory housing.
This relief valve regulates the engine oil pressure by allowingexcessive oil to return to
the sump, while the balance of the pressure oil is fed to the main oil gallery in the right half
of the crankcase. Residual oil is returned by gravity to the sump where, after passing
through a screen, it is again circulated through the engine.

Reissued: 1/15/81

2K5

POWER PLANT

PIPER CHEROKEESERVICE MANUAL

8-3. STANDARD PRACTICES-ENGINE. The following suggestions should be applied
wherever they are needed when working on the powerplant.
a. To insure proper reinstallation and/or assembly, tag and mark all parts, clips, and
brackets as to their location prior to their removal and/ or disassembly.
b. During removal of various tubes or engine parts,,inspect then for indications of
scoring, burning or other undesirable conditions. To facilitate reinstallation. observe the
location of each part during removal. Tag any unserviceable part and or units for
investigation and possible repair.
c. Extreme care must be taken to prevent foreign matter from entering the engine,such
as lockwire. washers. nuts, dirt, dust, etc. This precaution applies whenever work is done on
the engine, either on or off the aircraft. Suitable protective caps, plugs, and covers must be used
to protect all openings as they are exposed.
NOTE
Dust caps used to protect open lines must always be installed
OVER the tube ends and NOT INthe tube ends. Flow through
the lines may be blocked off if lines are inadvertently installed
with dust caps in the tube ends.
d. Should any items be dropped into the engine, the assemblyprocess must stop and the
item removed. even though this may require considerabletime and labor. Insure that all parts
are thoroughly clean before assembling.
e. Never reuse any lockwire, lockwashers, tablocks, tabwashers or cotter pins. All
lockwire and cotter pins must fit snuglyin holes drilled in studs and bolts for locking purposes.
Cotter pins should be installed so the head fits into the castellation of the nut. and unless
otherwise specified, bend one end of the pin back over the stud or bolt and the other end down
flat against the nut. Use only corrosion resistant steel lockwire and/ or cotter pins. Bushing
plugs shall be lockwired to the assembly base or case. Do-not lockwirethe plugto the bushing.
f. All gaskets, packings and rubber parts must be replaced with new items of the same
type at reassembly. Insure the new nonmetallic parts being installed show no sign of having
deteriorated in storage.
g. When installing engine parts which require the use of a hammer to facilitateassembly
or installation, use only a plastic or rawhide hammer.
h. Anti-seize lubrication should be applied to all loose-fit spline drives which are
external to the engine and have no other means of lubrication. For certain assembly
procedures, molybdenum disulfide in either paste or powdered form mixed with engine oil or
grease may be used.
CAUTION
Ensure that Anti-seize compounds are applied in thin even
coats, and that excess compound is completely removed to
avoid contamination of adjacent parts.
i. Temporary marking methods are those markings which will ensure identification
during ordinary handling, storage and final assembly of parts.
8-4. TROUBLESHOOTING.Troubles peculiar to the power plant are listed in Table VIII-I,
at the back of this section, along with their probable causes and suggestedremedies. When
troubleshooting the engine, ground the magneto primary circuit before performing any
checks on the engine.

Reissued:1/15/81

2K62K6

POWER PLANT

PIPER CHEROKEESERVICE MANUAL

8-5.

PROPELLER.

8-6.
a.
b.
c.
d.
e.
bolts.

REMOVAL OF PROPELLER. (Fixed Pitch.)
Insure master and magneto switches are off.
Move fuel selector to off position and place mixture control in idle cut-off.
Note the position of each component to facilitate reinstallation.
Remove the screws attaching the spinner assembly and remove the spinner.
Remove the safety wire that secures the six attaching bolts and remove the
The propeller is now free to be removed.

8-7. CLEANING, INSPECTION AND REPAIR OF PROPELLER. (Fixed Pitch.)
a. Clean the spinner, back plate and propeller surfaces with a non-corrosive
solvent, and inspect for nicks, scratches, corrosion and cracks.
b. Nicks in the leading edges of the blades should be filed out and all edges
rounded, as cracks sometimes start from such places. Use fine emery cloth for
finishing. (Refer to Figure 8-1 for propeller blade care.) A propeller with severe
nicks, scratches, corrosion or cracks should be returned to a propeller overhaul
shop or the manufacturer for inspection and repair.
c. Each blade face should be sanded lightly and painted, when necessary, with
a flat black paint to retard glare. A light application of oil or wax may be applied
to the surfaces to prevent corrosion.
8-8. INSTALLATION OF PROPELLER. (Fixed Pitch.)
a. Insure magneto switch is OFF.
b. Place the generator or alternator drive belt in the groove of the starter
ring gear and position the starter gear on the flange of the crankshaft. Ascertain
that the stamped "O" on the gear is aligned with the "O" on the crankshaft flange.
c. Install the propeller spinner backplate or bulkhead on the starter ring gear.
d. Rotate crankshaft until the top center (TC) mark on the starter gear and the
crankcase parting flange or the index mark on starter housing are aligned.
e. Install propeller with tips pointing at the two and eight o'clock position.
f. Install and tighten each propeller bolt, with washer, finger tight. Use a
torque wrench for final tightening and tighten in sequence so that all bolts are
pulled down evenly. Torque three-eights inch bolts to 280 to 300 inch-pounds
or one-half inch bolts to 720 to 780 inch-pounds (60 to 65 foot-pounds).
g. Check the propeller blade track as given in paragraph 8-12.
h. Safety the propeller mounting bolts with MS20995-C41 wire.
i . Install the spinner and tighten cap bolts to a torque of 35 to 40 inch-pounds.
j. Adjust generator or alternator drive belt as given in Checking Generator
and Alternator Belt Tension, Section XI.

Reissued: 1/15/81

2K7

POWER PLANT

PIPER CHEROKEESERVICE MANUAL

C345

Exagerated
view of nicks
in leading edge

view ofnick

Exagerated

in face of bladsd

Recommended
method for removing
nicks by riffle file and crocuscloth.
Blenddeepest portion of nick into
leading edge alignmentwith smooth

SECTION AANick in face of blade
removed by file and
ereci
cloth asrecom-

0

curves

Figure 8-1.
C367
1.
2.
3.
4.
5.
6.
7.
8.
9.

mended

Typical Nicks and Removal Method

SPINNER - PROPELLER
PROPELLER
BULKHEAD ASSEMBLY - SPINNER
"O" RING
GOVERNOR
CONTROL CABLE
CONTROL - KNOB
HOSE - MANIFOLD GAUGE
GAUGE - MANIFOLD PRESSURE

Figure 8-2.

Reissued:1/15/81

Propeller Installation (Constant Speed)
PA-28-235

2K8

POWER PLANT

PIPER CHEROKEESERVICEMANUAL

1740

14
10S
I

15

'

15

20

4.

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.

SCREW, SPINNER ATTACHMENT
SPINNER ASSEMBL
BOLT, BULKHEAD ATTACHMENT
WASHER
PLATE
BULKHEAD, FORWARD SPINNER
CUFF, SPINNER
Low PITCH STOP
JAM NUT
PROPELLER HUB

11.
12.
13.
14.
15.
16.
17.
18.
19.
20.

PROPELLER BLADE
SPINNER BACK PLATE
STARTER RING
""
RING SEAL
NUT, FLYWHEEL
STUD
WASHER
NUT
SAFETY WIRE
GREASE FITTING

Figure 8-3. Propeller Installation

Reissued: 1/15/81

2K9

POWERPLANT

PIPER CHEROKEE SERVICE MANUAL

TABLE VIII-I. PROPELLER TORQUE LIMITS
DESCRIPTION

REQUIRED TORQUE

Propeller Mounting Nuts -

55-65 Foot Pounds(1 )

Forward Bulkhead Attachment Bolts

30-35 Inch Pounds

Spinner Attachment Screws

20-25 Inch Pounds

(1) Fixed Pitch and constant Speed.

8-9. REMOVALOF PROPELLER. (Constant Speed.)
a. Insure that the master and magneto switches are off.
b. Move fuel selector to off position.
c. Place the mixture control in idle cut-off.
d. Note position of each component to facilitate reinstallation.
e. Remove the screws from around the spinner assembly and remove spinner.
f. Remove the safety wire from the six propeller mounting nuts on studs and remove
studs.
g. Place a drip pan under the propeller to catch oil spillage, then remove the propeller.
8-10. CLEANING. INSPECTION AND REPAIR OF PROPELLER. (Constant Speed.)
a; Check for oil and grease leaks.
b. Clean the spinner, propeller hub interior and exterior, and blades with a
non-corrosive solvent.
c. Inspect the hub parts for cracks.
d. Steel hub parts should not be permitted to rust. Use aluminum paint to touch up, if
necessary, or replate during overhaul.
e. Check all visible parts for wear and safety.
f. Check blades to determine whether they turn freely on the hub pivot tube. This can
be done by rocking the blades back and forth through the slight freedom allowed by the
pitch change mechanism. If they appear tight and are properly lubricated, the pitch change
mechanism should be removed so that each blade can be checked individually. If blades are
tight, the propeller should be disassembled.
g. Inspect blades for damage or cracks. Nicks in leading edges of blades should be filed
out and all edges rounded, as cracks sometimes start from such places. Use fine emery cloth
for finishing. (Refer to Figure 8-1 for propeller blade care.) Each blade face should be
sanded lightly and painted, when necessary, with a flat black paint to retard glare. A light
application of oil or wax may be applied to the surfaces to prevent corrosion.
h. It is recommended that for severe damage, internal repairs and replacement of parts,
the propeller should be referred to the Hartzell Factory or an authorized Service Station.
i. Grease blade hub through zerk fittings. Remove one of the two fittings for each
propeller blade, alternate the next time. Apply grease through the zerk fitting until fresh
grease appears at the fitting hole of the removed fitting. Care should be taken to avoid
blowing out hub gaskets.
j. Check condition of the propeller mounting nuts on studs.

Reissued: 1/15/81

2K10

POWER PLANT

PIPER CHEROKEESERVICE MANUAL

8-11. INSTALLING PROPELLER. (Constant Speed.)
a. Insure master and magneto switches are off.
b. Place fuel selector to off position.
c. Place mixture control in idle cut-off.
d. Observe the starter ring gear to make sure it is mounted properly on the
engine crankshaft flange. One of the bushings on the crankshaft is stamped with
an "O" mark and it must be inserted in the starter ring gear hole, likewise identified with an "O" mark.
e. Wipe crankshaft and propeller pilot to assure thatno chips or foreign matter enter the propellermechanism.
f. Check interior of propeller hubfor proper seating of "O" ring. Wipe inside
of hub to remove any traces of dirt. Check to see that "O" ring is covered with
grease.
g Raise propeller into position so that each stud mates with an engine flange
bushing and screw each stud in a few threads at a time until all are tight. Torque
to 60 to 70 foot pounds.
h. Check the propeller blade track as given in paragraph 8-12.
i . Safety the propeller mounting bolts with MS20995-C41 safety wire.
j . Install the spinner, torque cap bolts 35 to 40 inch pounds.

8-12. BLADE TRACK. Blade track is the ability of one blade tip to follow the
other, while rotating, in almost the same plane. Excessive difference in blade
track - more than .0625 inch - may be an indication of bent blades or improper
Check blade track as follows:
propeller installation.
a. With the engine shut down and blades vertical, secure to the aircraft a
smooth board just under the tip of the lower blade. Move the tip fore and aft
through its full "blade-shake" travel, making small marks with a pencil at each
position. Then center the tip between these marks and scribe a line onthe board
for the full width of the tip.
b. Carefully rotate propeller by hand to bring the opposite blade down. Center
the tip and scribe a pencil line as before and check that lines are not separated
more than .0625 inch.
c. Propellers having excess blade track should be removed and inspected for
bent blades. Constant speed propellers should be checked for parts of sheared
"O" ring, or foreign particles, which have lodged between hub and crankshaft
mounting faces. Bent blades will require repair and overhaul of assembly.

Reissued: 1/15/81

2K11

POWER PLANT

PIPER CHEROKEE SERVICE MANUAL

8-13.

PROPELLER GOVERNOR. (PA-28-235.)

8-14. REMOVAL OF PROPELLER GOVERNOR.
a. Remove the upper engine cowl.
b. Disconnect the control cable end from the governor control arm.
c. Remove the governor mounting stud nuts. It will be:necessary to raise the
governor as the nuts are being removed before the nuts can be completely removed.
d. Remove the mounting gasket. If the governor is to be removed for a considerable length of time and another unit not substituted, it is advisable to cover
the mounting pad to prevent damage caused by foreign matter.
8-15. INSTALLATION OF PROPELLER GOVERNOR.
a. Clean the mounting pad thoroughly, making very certain that there are no
foreign particles in the recess around the drive shaft.
b. Place the governor mounting gasket in position with the raised portion of
the screen facing away from the engine,
c. Align the splines on the governor shaft with the engine drive and slide the
governor into position.
d. With the governor in position, raise the governor enough to install washers
and start mounting nuts. Torque nuts even.
e. Connect the control cable end to the governor control arm. The ball stud
is installed in the inner hole of the control arm.
f. Adjust governor control per paragraph 8-16.
g. Install engine cowl.
8-16. RIGGING AND ADJUSTMENT OF PROPELLER GOVERNOR. (PA-28-235.)
(Refer to Figure 8-5.)
a. Start engine, park 90° to wind direction and warm in normal manner.
b. To check high RPM, low pitch setting, move the propeller control all the
way forward. At this position, the governor speed control arm (1) should be
against the high RPM fine adjusting screw (2). With the throttle full forward,
observe engine RPM, which should be 2575 RPM with high RPM properly adjusted.
c. Should engine RPM not be as required, the high RPM setting should be adjusted as follows:
1. Shut down the engine and remove the upper engine cowl.
2. Adjustthe governor by means ofthefine adjustmentscrew for 2575 RPM.
To do this, loosen the high RPM fine adjustment screw locknut and turn the screw
in a clockwise direction to decrease engine speed or in a counterclockwise direction to increase engine speed.

Reis
Reissued:
1/15/81
1/15/81

2K12

POWERPLANT

PIPER CHEROKEESERVICE MANUAL

960

O90

.K2 TS .125

Figure 8-4. Adjustment of Propeller Control (PA-28-235)
NOTE
One revolution of the fine adjustment screw.will increase or decrease the engine speed approximately
20 RPM.

C308

3. Reinstall upper engine cowl and repeat step b to ascertain proper RPM
setting.
4. After setting the proper high
RPM adjustment, run the self-locking
nut on the fine adjustment screw against
the base projection to lock.
5. Ascertain that the governor
control arm is adjusted to the proper
angle on the control wheel (4) as shown
in Figure 8-5.
d. With the high RPM adjustment
complete, the control system should be
adjusted so that the governor control
1. CONTROL ARM
arm will contact the high RPM stop.
2. RPM ADJUSTMENT SCREW
3. LOCK NUT
On airplanes with Serial Nos. 28-10166
4. CONTROL WHEEL
to 28-11039 incl., the cockpit knob
5. BOLT ASSEMBLY
should be .062 to .125 of an inch from
Figure 8-5. Propeller Governor
its full forward stop. Airplanes with
(PA-28-235)
Serial Nos. 28-11040 and up, the cockpit

Reissued: 1/15/81

2K13

POWER PLANT

PIPERCHEROKEESERVICEMANUAL
control lever should be .031 to .062 of an inch from its full forward stop. (Referto Figure 8-4.) To
adjust the control travel, disconnect the control cable end from the control arm, loosen the cable
jam nut and rotate the end to obtainthe desiredlevel clearance.Reconnectthe cable end and tighten
jam nut.
e. It is usually only necessaryto adjustthe high RPM settingof the governorcontrol system,
as the action automaticallytakescare of the positivehigh pitch setting.
8-17. ENGINE.
8-17a. REMOVALOF ENGINECOWLINGS.
a. Release cowlingfastenersor attachmentscrews,dependingon the type installed.
b. Disconnectall electricalleads.
c. Removecowlings.(Moveupper cowlingup and forward,drop lowercowling down.)
8-17b. INSTALLATIONOF ENGINECOWLINGS.
a. Position cowlings in place. (Bottomcowlingfirst, insert locator pins of upper cowling and
lower into place.)
b. Connectelectricalleads.
c. Securefastenersor attachmentscrews,dependingon the type of cowlinginstalled.
8-17c. INSTALLATIONOF BUSHINGSAND PINSFOR FIBERGLASTYPE COWLINGS.
a. With cowlings removed,locatebushingson lowercowling.(See Figure 8-7.)
b. Using snap ringpliers, removesnap ring and old bushing.
c. Install new bushingand new snap ring.
NOTE
Bushings should be inspected each 100 hours and
should be replacedupon condition,but no later than
500 hours time in service.
d. Locate pins in upper cowling.
NOTE
It should not be necessaryto replace the pins unless
bushing in lower cowling has worn enough to allow
damage to the pin. Any noticeable notching or cutting of the pin requiresreplacement.
e. If it is necessaryto remove the pins, appropriatetools should be used to remove the fiberglas resin from around the pin and plate assembly.(A template or adequatemeasurementsshould
be made to assure proper alignmentof the new pin and plate assembly.)
f. Removepin and plate assembly
g. To install new pin and plate assemblyit will be necessaryto preparethe fiberglassurface to
accept the new plate. (See Paragraph4-58, FIBERGLASREPAIRS.)
1. Clean area as required,and roughen.
2. Preparecowlingsurfaceby applyingresin. Do not allowto harden.
3. Installplate and pin.
4. Lay in a layer ofresin impregnatedfiberglascloth over the plate and surroundingfiberglas. (Use templateor measurementsfrom step e to assurealignment.)Allow to cure.
8-18. REMOVALOF ENGINE.(PA-28-140,-150, -160,-180) (Referto Figure 8-6 or 8-7.)
a. Turn off all electrical switches in the cockpit and then disconnect the battery ground wire at the battery.
b. Move the fuel selectorlever in the cockpit to the OFF position.
c. Remove ihe engine cowlings per Paragraph 8-17a. Be certain that-all electrical leads
are disconnectedprior to removalof the cowling.
d. Removethe propellerper paragraph8-6.
e. Disconnect the starter positive and ground leads at the starter, and their
attachment clamps.

Interim Revision: February 15, 1995

POWERPLANT

2K14

PIPERCHEROKEESERVICEMANUAL
f. Disconnectthe cabin heat and defrostertubes from the muffler.
g. Disconnectthe primer line at the tee connection.
h. Disconnect the throttle and mixture cables at the carburetor and carburetor heat control.
The carburetormay be removedif it is founddesirable.
i. Disconnectthe mechanicalfuel pump supply line at the pump.
NOTE
When a question may arise as where to reconnect
hose, line or wire, the item at the separation should
be identified (tagged) to facilitate reinstallation.Open
fuel. oil, vacuum lines and fittings should be capped
to preventcontamination.
j. Disconnectthe engine oil coolerlines from the cooler.
k.Disconnect the magneto "P" leads at the magnetos . Insert a protective cover
over the connection.
l. Disconnectthe engine oil temperaturelead at the aft end of the engine.
m. Disconnectthe tachometerdrive cable from the rear of the engine.
n. Untie the ignitionharness,hosesand lines at the aft end of the engine.
o. Disconnectthe vacuumpump lines at the pump.
p. Disconnectthe oil pressureline from the rearof the engine.
q. Disconnectthe generatoror alternatorleadsand the cable attachmentclamps.
r. Attach a one-half ton (minimum) hoist to the hoisting straps and relieve the
tension from the mounts.
NOTE
Place a tail stand under the tail of the airplanebefore
removingthe engine.
s. Checkthe eneine for any attachmentsremainingto obstructits removal.
t. Drain the engine oil, if desired,and close the drain.
u. Remove the four engine mount assemblies and swing the engine free, being careful
not to damage any attachingparts.
8-19. INSTALLATIONOF ENGINE.(PA-28-140,-150,-160, -180) (Refer to Figure 8-6
or 8-7.)
a. Prior to installing the engine, be certain that all components of the engine such as
exhaust stacks,carburetor,etc. are installed.
b. Attach a one-half ton (minimum) hoist to the engine hoisting straps and swing the
engine into alignmentwith its attachingpoints.
NOTE
On PA-28-140 aircraft with Serial Nos. 28-25000
and up, refer to paragraph 8-20 and Figure 8-8 for
shock mount installation instructions. When using
these instructions,steps c thru e, of paragraph 8-19
may be skipped.
c. Insert an engine mount bolt, with washer against head, in the engine mount and
slide half of the mount assembly on the bolt. Repeat this procedure for the other three
attachment points.

d. Position the mounting lugs of the engine so that they align with the engine mount
attachingpoints, then move the engine rearwardonto the mounts.
e. Slide onto each mounting bolt a spacer washer, spacer and the forward half of the
mount. Installwasher and nuts, and torquethe nuts of thebolts to 450 to 500 inchpounds.

Reissued: 1/15/81

POWER PLANT

2K15

PIPER CHEROKEE SERVICE MANUAL

C310
1.
2.
3.
4.
5.
6.
7.
8.
9.

ENGINE AND NOSE GEAR MOUNT
THROTTLE CONTROL
CARBURATOR HEAT CONTROL
MIXTURE CONTROL
TACHOMETER HAET
OIL COOLER LINES
OIL COOLER
BAFFLING
TOP COWL

10.
11.
12.

PROPELLER
SPINNER MOUNTING PLATE
SPINNER ASSEMBLY
LANDING LIGHT
13.
14. PAPER AIR FILTER
15. LANDING LIGHT - AIR FILTER
ATTACHMENT BOLT
16. HEATER SHROUD

8

12

13

15

Figure 8-6. Engine Installation (PA-28-140, -150, -160, -180;
Serial Nos. 28-1 to 28-1760.)

Reissued: 1/15/81

2K16

POWER PLANT

PIPER CHEROKEESERVICEMANUAL
1. ENGINEAND NOSEGEAR MOUNT
2. THROTTLECONTROL
3. CARBURETORHEAT CONTROL
4. MIXTURECONTROL
5. TACHOMETERSHAFT
6. ENGINESHOCKMOUNT
7. OIL COOLER
8. BAFFLING
9. TOP COWL

10. BOTTOMCOWL
11. SPINNERMOUNTINGPLATE
12. PROPELLER
13. SPINNERSUPPORTPLATE
14. SPINNER
15. HEATERANDMUFFLERASSEMBLY
16. AIR FILTER
17. FRESHAIR INTAKE
18. POWERPLANTASSEMBLY
19. PLATEASSEMBLY,BUSHING,
RETAININGRING,WASHERS,NUTS

NOTE: A maximumof (3) AN960-616
washerscan be used to permita max. of
2.5 threadsexposedon the bolt.Torque
to 230/240inch-pounds.

Figure 8-7. Engine Installation
(PA-28-140, -150. -160, -180, Serial Nos. 28-1761 and up)
Interim Revision: February 15, 1995

POWER PLANT

2K17

PIPERCHEROKEE
SERVICEMANUAL

138

I
BOLT
WASHER

SHOCKMOUNT
SPACER
ENGINEMOUNT
SHOCKMOUNT
ENGINEMOUNTINGLUG

SECTIONA-A

SECTIONB-B

TORQUE - 450-500 IN. LBS.
..

SPACERWASHER

SECTIONC-C

SECTIOND-D

Figure. 8-8. Engine Shock Mount Installation (PA-28-140, Serial Nos. 28-25000 and up)

Reissued: 1/15/81

2K18

POWER PLANT

POWER PLANT

PIPERCHEROKEE
SERVICEMANUAL

f. Connect the generator or alternator leads and secure cables with clamps.
g. Connect the oil pressure line, tachometer drive cable, oil temperature lead and the
engine vent tube to the aft end of the engine.
h. Connect the vacuum pump line at the pump.
i. Secure the ignition harness, hoses and lines at the aft end of the engine using
koroseal lacing.
j.
Connect both lines to the oil cooler.
k. Connect the mechanical fuel pump supply line at the pump.
1. Connect the magneto "P" leads to the magnetos.
m. Connect the throttle, mixture and carburetor heat cables at the engine
components.
n. Connect the cabin heat and defroster tubes to the muffler.
o. Connect the starter positive and ground leads at the starter and secure with
attachment clamps.
p. Be certain that the magneto switches are OFF 'and install the propeller per
paragraph 8-8.
q. Install the proper grade and amount of engine oil. Refer to Lubrication Chart,
Section II.
r. Connect the battery ground wire at the battery.
s. Open the throttle and fuel valve completely. Turn on the electric fuel pump and
check the fuel line for leaks.
t.
Install the engine cowlings and remove the tail stand.
NOTE
To avoid a possible high speed bearing failure resulting from a
lack of lubrication during initial starts, refer to the latest
revision of Avco-LycomingService Instruction No. 1241 for
information on pre-oiling the engine.
u. Perform an engine operational check. Refer to the engine manufacturer's
appropriate operator's manual.
8-20. INSTALLATION OF ENGINE SHOCK MOUNTS. (PA-28-140, Serial Nos. 28-2500
and up.) (Refer to Figure 8-8.)
a.
Assemble the engine shock mounts on the engine mount as shown in Figure 8-8.
Note the position of each mount carefully. The upper right and lower left mounts are the
same, as are the upper left and lower right.
b. Swing the engine into place, positioning the engine mounting lugs so they align
.with the engine mount attachment points.
c. Position the shock mount bolts through the'mounting lugs and secure with nuts.
Torque the nuts progressively,followinga circular sequence until a torque value of 450-500
inch pounds is reached.

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8-21. REMOVAL OF ENGINE (PA-28-235). (Refer to Figure 8-9.)
a. Turn off all electrical switches in the cockpit and then disconnect the battery
ground wire at the battery.
b. Move the fuel selector lever in the cockpit to the OFF position.
c. Remove the engine cowling by the following procedure:
1. Release the cowl fasteners, two on each side and two at the top aft of
cowl.
2. Lift the aft end of the cowl and then slide it forward to release the two
stud type front fasteners.
Remove the top cowl.
3. Disconnect the landing light lead at the quick disconnect located in the
bottom cowl.
4. Remove the screws securing the bottom cowl at its aft end and brace
across bottom aft of cowl. Remove the bottom cowl.
d. Remove the propeller per paragraph 8-6 or 8-9.
e. Disconnect the cabin heat and defroster tubes from the heat muff.
f. Disconnect the primer line at the tee connection.
g. Disconnect the mechanical fuel pump inlet line that is connected to the right
side of the pump.
h. Disconnect the starter leads at the starter and their attachment clamps.
i . Disconnect the alternator leads and the attachment clamps.
j . Disconnect the carburetor heat, throttle and mixture controls from the engine components.
k. Disconnect the tachometer cable from the rear of the engine.
1. Disconnect the hose from the vacuum pump.
m. Disconnect the magneto "P" leads and insert a protective cover over the
connection.
n. Disconnect the oil pressure line from the rear of the engine.
o. If the airplane involved is equipped with a constant speed propeller, disconnect the propeller control cable at the propeller governor and the manifold
pressure line from the left rear cylinder of the engine.
p. Attach a one-half ton (minimum) hoist to the hoisting strap and relieve the
tension on the engine mount.
NOTE
Place a tail stand under the tail of the airplane before
removing the engine.

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q. Check the engine for any attachments remaining to obstruct its removal.
r. Drain the engine oil, if desired, and then close the drain.
s. Remove the four engine mount assemblies and swingthe engine free, being
careful not to damage any attaching parts.
8-22. INSTALLATION OF ENGINE (PA-28-235). (Refer to Figure 8-9.)
a. Attach a one-half ton (minimum) hoist to the engine hoisting straps and
swing the engine into alignment with its attaching points on the mounts.
b. Insert an engine mount bolt through the hole of a mount attachment point
(A washer is installed next to the head of the bolt.) and slide a half of the shock
mount assembly on the bolt. Repeat for the other three mounts.
c. Position the mounting lugs of the engine so that they align with the engine
mount attaching points, then move the engine rearward onto the mounts.
d. Slide onto each mounting bolt a spacerwasher, spacer and the forward half
of mount. Install the washer and nut, and torque the nuts to 450 to 500 inch pounds.
e. If the airplane involved is equipped with a constant speed propeller, connect
the propeller control cable at the propeller governor and the manifold pressure
line to the left rear cylinder of the engine.
f. Connect the oil pressure line to the aft end of the engine.
g. Remove the protective cover from the magneto "P" leads and connect the
leads to the magnetos.
h. Connect the hose to the vacuum pump.
i. Connect the tachometer cable to the rear of the engine.
j. Connect the carburetor heat, throttle and mixture controls to the engine
components.
k. Connect the alternator leads and secure with the attachment clamps.
1. Connect the starter leads at the starter and secure with the attachment
clamps.
m. Connect the mechanical fuel pump inlet line that is connected to the right
side of the pump.
n. Connect the primer line at the tee connection.
o. Connect the cabin heat line and defroster tubes at the heat muff.
p. Be certain that the magneto switches-are OFF and install the propeller per
paragraph 8-9 or 8-13.
q. Install the proper grade and amount of engine oil. Refer to Lubrication
Chart, Section II.

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1120

1.
2.
3.
4.
5.
6.
7.
8.
9.

NOTE: A maximum of (3) AN960416
washers can be used to permit a max. of
2.5 threads exposed on the bolt. Torque
to 230/240
Inch-pounds.

ENGINE MOUNT ASSEMBLY
CARBURATOR HEAT CONTROL
MIXTURE CONTROL CABLE
TACHOMETER SHAFT
OIL
RADIATORHOSE
OIL RADIATOR
ENGINE BAFFLES
TOP COWL ASSEMBLY
PROPELLER ASSEMBLY

CABLE

17

10.
11.
12.
13.
14.
15.
16.
17.

SPINNER BULKHEAD ASSEMBLY
PROPELLER SPINNER ASSEMBLY
CARBURETOR AIR FILTER ASSEMBLY
CABIN HEAT BOX
MUFFLER ASSEMBLY
CARBURETOR HEAT SHROUD
OIL DRAIN VALVE
BOTTOM COWL ASSEMBLY

Figure 8-9. Engine Installation (PA-28-235)

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r. Connect the battery ground wire at the battery.
s. Open the throttle and fuel valve completely; turn on the electric fuel pump and
check the fuel lines for leaks.
t. Install the engine cowlingsand remove the tail stand.
NOTE
To avoid a possible high speed bearing failure resulting from a
lack of lubrication during initial starts, refer to the latest
revision of Avco-Lycoming Service Instruction No. 1241 for
information on pre-oiling the engine.
u. Perform an engine operational check. Refer to engine manufacturer's appropriate
operator's manual.
8-23. INSTALLATION OF OIL COOLER.
a. When installing fittings in the oil coolers, care should be used to prevent excessive
torque being applied to the cooler. When a rectangular fitting boss is provided, a backup
wrench should be used, employing a scissor motion, so that no load is transmitted to the
cooler. When the oil cooler has a rounds fitting boss, care should be taken not to permit
excessivetorque on the fittings.
b. If a pipe thread fitting is used, it should be installed only far enough to seal with
sealing compound.
c. Apply Lubon No. 404 to all male pipe thread fittings; do not allow sealant to enter
the system.
d. If fitting cannot be positioned correctly using a torque of 10 to 15 foot-pounds.
another fitting should be used.
e. When attaching lines to the cooler, a backup wrench should be used.
f. After installation, inspect the cooler for distorted end cups.
g. Run-up engine. After run-up, check for oil leaks.
8-24. ADJUSTMENT OF THROTTLE AND MIXTURE CONTROLS. (Refer to Figure
8-10.) Throttle and mixture controls are adjusted so that when the throttle arm on the
carburetor is rotated forward against its full throttle stop and the mixture control is rotated
forward against its full rich stop, the cockpit control knobs of the throttle and mixture
should have 0.062 to 0.125 of an inch spring back when in the forward position.
a. The throttle may be adjusted as follows:
1. At the carburetor, disconnect the clevis end of the throttle control cable from
the control arm. Loosen the jam nut that secures the clevisend.
2. Adjust the linkage by rotating the clevis end on the cable to obtain 0.062 to
0.125 of an inch spring back when the control is in the forward position.
3. Reconnect the clevisend to the control arm and safety.
b. The mixture may be adjusted as follows:
1. At the carburetor, loosen the swivelfitting that connects the wire of the control
cable to the mixture arm.

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OLDA/C

890

0.062

TO 0.125

NEWA/C

0.010

TO 0.030

Figure 8-10. Adjustment of Engine Controls
2. Reposition the fitting on the wire to obtain .062 to .125 of an inch spring back
between the knob and plate when the mixture control arm isagainst its stop.
3. Tighten the swivel fitting and safety. The control wire should be straighted to
align with the control cable casingafter tightening the swivel fitting.
c. Check security of cable casingattachments.
d. Pull throttle and mixture knobs in cockpit full aft to ascertain that the idle screw
contacts its stop and the mixture control arm contacts its lean position.
8-25 ADJUSTMENT OF THROTTLE AND MIXTURE CONTROLS. (PA-28-140,
Serial Nos. 28-25000and up; PA-28-180, Serial Nos. 28-4378and up; PA-28-235,Serial Nos.
28-11040 and up.) (Refer to Figure 8-10.) Throttle and mixture controls are adjusted so that
when the throttle arm on the carburetor is rotated forward against its full throttle stop and the
mixture control is rotated forward against its full rich stop, the cockpit control levers of the
throttle and mixture should have 0.010 to 0.030 of an inch spring back when in the forward
position.
a. The throttle may be adjusted as follows:
1. For PA-28-140 aircraft, S/N 28-25001 thru 28-7225373 with Kit 760 780
installed, ascertain that there is some cushion at the throttle control handle in the cockpit
with the throttle completely closed. Check that the bearing on the carburetor end of the
control cable has the proper thread engagement by use of the inspection hole. Tighten the
jam nut against the rod end of the bearing.
2. For aircraft other than those listed in Step 1, proceed as follows:
(a) At the carburetor, disconnect the clevis end of the throttle control cable
from the control arm. Loosen the jam nut that secures the clevisend.
(b) Adjust the linkage by rotating the clevis end on the cable to obtain 0.010 to
0.030 of an inch spring back on instrument stop when in full throttle
position.

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(c) Reconnect the clevis end to the control arm and safety.
b. The mixture may be adjusted as follows:
1. At the carburetor, disconnect the clevis end of the mixture control cable from
the control arm. Loosen the jam nut that secures.the clevis end.
2. Adjust the linkage by rotating the clevis end on the cable to obtain 0.010 to
0.030 of an inch spring back on the instrument panel stop when in full rich position.
3. On aircraft equipped with air conditioning systems, a micro switch is located
below the throttle control which is set to actuate in the full open position. With the throttle
control adjusted to obtain a clearance of .010 to .030, adjust the micro switch to actuate at
this point also.
4. Reconnect the clevisend to the control arm and safety.
c. Check security of cable casingattachment.
d. Pull throttle and mixture levers in cockpit full aft to ascertain that the idle screw
contacts its stop and the mixture control arm contacts its lean position. On 1975 models
and up, a mixture control lock is incorporated in the quadrant cover which prevents the
mixture control from being moved to the idle cutoff position inadvertently. The lock must
be depressed before the control can be moved completely aft. Ascertain that the lock
operates freely without any tendency to bind or hang up.

THIS SPACE INTENTIONALLYLEFT BLANK

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8-26. CARBURETOR.
8-27. CARBURETOR MAINTENANCE. In general, little attention is required between
carburetor overhauls. However, it is recommended that the following items be checked
during recommended inspection periods of the engine.
a. Check tightness and safety of all nuts and screwswhich fasten the carburetor to the
engine.
b. Check all fuel lines for tightness and evidence of leakage.
c. Check throttle and mixture control rods and levers for travel, tightness and safety.
d. Clean the fuel inlet screen. (Refer to Figure 8-11 or 8-12.)
e. Remove the plug at the aft position of the carburetor and drain any accumulation of
foreign matter.
f. Check carburetor air box for wear and full travel of heat door.
g. Check the adjustment of the idle mixture and idle speed. (Refer to paragraphs 8-29
and 8-30.)
8-28. THROTTLE ARM.
a. Remove screw securing the throttle arm to the carburetor. Do not remove the
throttle arm.
b. Remove and discard lock tab.
c. Examine the screw to determine if there is a hole through the head of the screw. If
not, drill a 1/16 inch diameter hole through the head of the screw.
d. Reinstall the screw; torque to 20 to 28 inch-pounds.
NOTE
Be sure the torque handle is correctly calibrated to insure the
attaching screw is neither under nor over tightened.
e. Using .032 inch diameter safety wire, first tie the wire to the idle stop lever and then
continue as shown in Figures 8-11 and 8-12.
f. Depending upon the carburetor model, the sequence and direction of tying may
vary; however, the idle stop arm, throttle arm, and attaching screws must all be tied
together.
8-29. ADJUSTMENT OF IDLE MIXTURE. (Refer to Figures 8-11 and 8-12.)
a. After performing the standard engine starting procedure, operate the engine for at
least two minutes between 800 to 1200 RPM to insure proper engine warmup.

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C345

2573

1

TIGHTEN THROTTLE ARM SCREW
(8) TO 20 - 28 IN. LBS. TORQUE

Figure 8-11. Carburetor
(PA-28-140, -150, -160)

Figure 8-12. Carburetor
(PA-28-180, -235)
WARNING

When performing engine warm-up indoors, provide a barrier
about the engine to prevent serious injury. Also provide
adequate means of ventilating the work area.
b. Draw back on the cockpit throttle control lever to obtain a reading of
approximately 550 RPM on the tachometer.
c. Turn the idle mixture adjusting screw (1) located near the rear of the carburetor,
clockwise, leaning the fuel mixture. Continue to do this until the engine begins to run
roughly, at which time the engine speed will decrease.
d. Turn the screw counterclockwise until the engine runs smoothly again. Continue to
turn the screw in the same direction until the engine begins to run roughly once more. At
this point, the fuel mixture will be too rich and engine speed will decrease again.
e. Now advance the screw to a midway position between the lean and rich fuel
mixture; the RPM of the engine will reach a maximum speed for idle mixture settings.

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8-30. ADJUSTMENTOF IDLE SPEED.
a. Pull back the cockpit throttle control until it is completely aft and in the closed
position: Observe the engine speed on the tachometer.
b. Adjust idle adjustment screw to obtain from 550 to 650 RPM.Rotate the screw
clockwise to increase the speed of the engine; counterclockwise to decrease the engine
speed. The screw is located on the throttle arm.
NOTE
One complete revolution of the carburetor idle screw
provides a variation of approximately 100 RPM in idling
speed.
8-31. MAGNETO.(Bendix.)
CAUTION
Ascertain that the primary circuits of both engines
are grounded before working on the engine.

8-32. INSPECTION OF MAGNETOS. (Refer to Figure 8-12.) At time of engine inspection
or when a magneto has been removed from the engine, the following checks may be performed.
1. Inspect distributor block contact springs. Top of spring must not be
more than .422 inches below, top of tower as shown in Figure 8-14. If broken or
corroded, they should be replaced.
2. Inspect oil felt washer, It should be saturated with oil. If dry, check
for worn bushing. If O.K., add No. 30 oil.
3. Inspect distributor block for cracks or burned areas. The wax coating
on the block should not be removed. Do not use solvents.
4. Look for excess oil in breaker compartment.
If present, it may mean
a bad oil seal or oil seal bushing at drive end. Check manufacturer's overhaul
procedure.
5. Look for frayed insulation or broken wire strands in leads in back of
magneto. See that terminals are secure. Be sure wires are properly positioned.
6. Inspect capacitor visually. If possible, test for leakage, capacity and
series resistance.
Remember, an electrical failure of an aircraft capacitor is
rare.
7. Adjustment of breakers must be correct for proper internal timing of
magneto. (Refer to paragraph 8-34.)
8. Check if breaker cam is clean and smooth; if cam screw is. tight (25 in.

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A851

15

21
4

CONTACTSPRING
CONTACT SPRING

9

13
5. LEAD WIRE

9. IMPULSE

COUPLING

10. FLYWEIGHTS
6 CAPACITOR
2 RETAINNGRING
7 BREAKERASSEMBLY 11. DELETED
3 DISTRIBUTORBLOCK
12 LEADCIRCUIT
4 BREAKERCOMPARTMENT 8 BREAKERCAM

13. CONTACTSPRING
14. INSULATOR
15. VENTPLUG

Figure 8-13. Magneto Inspection(Bendix)
lbs.).

If new points are installed, blot a little oil on cam.
9. Inspect impulsecoupling (-21 and -204 magneto) flyweights for excessive
looseness on the axles. Design couplings having .927 inch thick body should be
checked with 1/8 inch drill. Couplings with .974 inch thick body are checked with
a No. 18 drill. If drill fits between cam and flyweight, the fit is too loose and
coupling should be replaced. (Refer to Figure 8- 15.)
10. Check impulse coupling for excess wear on the contact edges of body
and flyweights.
-11. Checkthat the impulse couplingflyweight axle rivets are tight and there
are no cracks in body.
12. Look at the lead conduits. A few broken strands won't hurt, but if the
insulation looks tired, you may be in for trouble. The special high temperature
coating, used on light-weight harnesses, is provided chiefly for vibration resistance and mechanical protection. The integrity of the harness is not sacrificed if
small areas of the braid show peeling or flaking of this coating.
13. Check the springs for breaks, corrosion, or deformation. If possible,
check continuity from block with tester or light.
14. Check insulators for cracks, breaks, or evidence of "old age". Be sure
they are clean.
15. Timing and ventilator plugs. Ventilator has drilled holes and should be
in lowest hole in magneto to serve also as drain for excess water or oil. Solid
plug is used in other hole or in location exposed to rain or water.

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A825

0.422 MAX.

C326

MEASURE BODY
THICKNESS HERE

Figure 8-14. Contact Spring Inspection

Figure 8-15. Impulse Coupling

8-33. REMOVAL OF MAGNETOS. Before removing the magneto, make sure
magneto switches are OFF.
a. Remove the harness assembly terminal plate-from the magneto.

WARNING
The magneto is not internally grounded; when the
ground lead is disconnected, the magneto is hot. Removing the harness assembly terminal plate first and
installing them last, minimizes the danger of starting
the engine accidentally when the ground lead is removed from the magneto.
b. Disconnect the ground lead at the magneto.
c. Remove the nuts and washers and draw the magneto from the engine.
NOTE
The magneto service instructions in this manual are
to cover minor repairs and timing. For further repairs and adjustments of the magnetos, it is recommended that the latest revision of the magneto manufacturer's
service instructions be followed.

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826

RED OR
WHITE TOOTH

C326

2 1/4 IN.

SOFTWIRE

SOLDER

3/ 4IN.

CAM WASHER

TIMING MARK-

Figure 8-16. Magneto Timing Marks

Figure 8-17. Timing Pointer

8-34. TIMING PROCEDURE. (Internal Timing) (-20 and -200 Series Magnetos)
When installing new or adjusting breaker points and before timing the magneto to
the engine, it is important that the internal timing of the magneto be correct.
a. To internally time the -20 series and the early -200 series magneto without the case in timing marks, the magneto should be removed from the engine to
determine "E" gap.
b. To determine "E" gap, find neutral position of the magneto drive by rotating drive coupling in a left hand direction until the red or white chamfered tooth
on the distributor drive gear appears through the timing inspection hole. At the
same location, the drive should feel to have fallen into a notch or neutral position.
c. With timing plate and pointer attached (Refer to Figure 8-17.) and pointer
set at zero, rotate couplingfrom neutralin a left hand direction 10 degrees. Appearing through timing hole, ascertain if the white or red tooth aligns with the
white line of the distributor block. (Refer to Figure 8-16.) Alignment may not
vary over + 4 degrees.
NOTEA timing kit, including timing plate, etc. may be purchased through the engine or magneto manufacturer.
A pointer may be formed as shown in Figure 8-17.

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C326

C326

MARK

~30 30

HOUSING
HOUSING
CENTER CENTER
MARK

TIMING

LINE

NUMBER OF DEGREES RETARD

Figure 8-19. Breaker Compartment
with Cast Timing Marks

Figure 8-18. Timing Kit Installed

d. Using the alignment of the gear marked with the white line of the distributor block as a reference, adjust breaker points to open at this point. Turn the
magneto drive until the cam follower is on high point of the cam lobe. Measure
contact clearance, it must be .018 inch + .006 with the "E" gap set 10 degrees
+ 4 degrees. If breaker points do not come within tolerances, they should be replaced.
NOTE
A pointer can also be made by wrapping a piece of soft
wire tightly around the head of cam securing screw and
bending it to extend over timing marks.
e. If magneto is type which has "cast in" timing marks (-200 series, see Figure 8-19), main breaker may be adjusted with magneto on engine as follows: turn
engine crankshaft until notch in cam is aligned with mark at top of breaker com partment. Set wire pointer in center of the "E" gap boss at the side of breaker
compartment.
Connect timing light across main breaker.
Adjust main breaker
contacts to open at this point. Turn engine crankshaft until cam follower is on
the high point of the cam lobe. Measure contact clearance.
It must be .018 +
.006. If necessary, readjust breaker and recheck to be sure that contacts will
open within "E" gap tolerance + 4 degrees. (Width of "E" gap boss.)

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CAUTION
If cam screw was removed, be sure to replace flat
washer, lock washer and screw. Torque to 25 inch
pounds.
f. With internal timing checked,
(Refer to paragraph 8-35.)

the magneto may be timed to the engine.

8.35. INSTALLATION AND TIMING PROCEDURE. (Timing Magneto to Engine).
The magnetos can be installed and timed to the engine by the following procedure:
NOTE
Ascertain that the breakers
ternal timing of magnetos.

are correct for proper in-

a. Remove the top spark plug from No. one cylinder. Place the thumb of one
hand over the spark plug hole and rotate the crankshaft in direction of normal rotation until the compression stroke is reached. The compression stroke is indicated by a positive pressure inside the cylinder tending to lift the thumb off the
spark plug hole. In this position both valves of No. one cylinder are closed. Turn
the crankshaft opposite to its normal direction of rotation until it is approximately
35 degrees BTC on the compression stroke of No. one cylinder. Rotate the crankshaft in its normal direction of rotation until the 25 degrees mark on the starter
gear and the crankcase parting flange or the index on the front of the starter
housing are aligned.
b. Rotate the magneto gear on the right magneto until the chamfered tooth on
the distributor gear inside the magneto aligns with the white pointer as seen
through the window in the magneto cover. Without allowing the gear to turn from
this position, assemble the magneto and gasket. Secure magneto in place with
washers and nuts; tighten the nuts only finger tight.
c. Fasten ground wire on electric timing light to any unpainted metallic portion of the engine, and one of the positive wires of the timing light to a suitable
terminal connected to the ground terminal connection of the right magneto. Turn
engine crankshaft several degrees from BTC in directionopposite to that of normal rotation.

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d. Turn on the switch of the timing light. Turn the crankshaft very slowly in
direction of normal rotation until the timing mark on the front face of the ring
gear support aligns with the drilled hole in the starter, at which point the light
should go on, (on battery operated models). If not, turn the magneto in its mounting flange slots and repeat the procedure until the light goes on at 25 degrees before top dead center. Tighten the two mounting nuts and replace magneto inspection plug.
e. Install the impulse coupling magneto adapter and gasket on the left magneto
mounting pad of the accessory housing.
CAUTION
The impulse coupling magneto can be used only on the
left side of the engine (as viewed from rear).
f. Remove inspection plug, depress pawl on impulse coupling shaft and turn
impulse coupling on left magneto until the white beveled tooth (or middle tooth, if
timing gear has three beveled teeth) aligns with the timing pointer. Without allowing the magneto gear to turn from this position, assemble the left magneto to
the accessory housing and secure with washers and nuts. Tighten nuts only finger
tight.
g. Connect the other positive wire of the timing light to a suitable terminal
connection of the left magneto and time the magneto in the same manner as described for the right magneto.
h. After both magnetos have been timed, leave the timing light wires connected
and recheckmagneto timing as previously described to make sure that both magnetos are set to fire together. If timing is correct, both timing lights will go on
simultaneously when the 25 degree mark aligns with the centerline of the crankcase. If the breaker points open too early, loosen the mounting nuts and rotate
the magneto clockwise. If the breaker points open too late, rotate the magneto
counterclockwise. Remove timing light and ignition timing pointer, and replace
timing inspection plug in magneto.
i. After the magnetos have been properly timed, clean the breaker points to
remove any trace of oil or dirt. Replace breaker cover and lock the retaining
screws together with lockwire.

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NOTE
The crankshaft should not be rotated more than 10 degrees
in direction opposite normal rotation as the pawl on the
impulse coupling will engage with the stop pin and late
timing will be indicated through the impulse coupling
mechanism. If this should happen, rotate crankshaft in
normal direction until sharp click is heard; this will indicate
that the impulse coupling has passed through fiing position.
Turn crankshaft in direction opposite normal rotation to
approximately 35 degrees BTC and proceed with timing
check.

8-36. MAGNETO. (Slick.)
a. For service information concerning these magnetos refer to the latest revisions of
Lycoming Service Letter No. L177 and Lycoming Service Instruction No. 1189.

8-37. HARNESSASSEMBLY

8-38. INSPECTION OF HARNESS.
a. Check lead assemblies for nicks, cuts, mutilated braiding, badly worn section or any
other evidence of physical damage. Inspect spark plug sleeves for chafing or tears and
damaged or stripped threads on coupling nuts. Check compression spring to see if it is
broken or distorted. Inspect grommet for tears. Check all mounting brackets and clamps to
see that they are secure and not cracked.
b. Using an ohmmeter, buzzer, or other suitable low voltage device, check each lead for
continuity. If continuity does not exist, wire is broken and must be replaced.
c. Minor repair of the harness assembly, such as replacement of contact springs, spring
retainer assemblies, insulating sleevesor of one lead assembly, can be accomplished with the
harness assembly mounted on the engine. However, should repair require replacement of
more than one lead assemblyor of a cable outlet plate, the harness should be removed from
the engine and sent to an overhaul shop.

8-39. REMOVALOF HARNESS.
a. Disconnect the clamps that secure the wires to the engine and accessories.
b. Loosen the coupling nuts at the spark plugs and remove the insulators from the
spark plug barrel well. Use caution when withdrawing the insulator not to damage the
insulator spring.
c. Place a guard over the harness insulators.

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d. Remove the harness assembly terminal plate from the magneto.
e. Remove the engine baffle plate that receives the harness assembly.
f. Remove the harness from the airplane.
8-40. INSTALLATION OF HARNESS. Before installing harness on magneto,
check mating surfaces for cleanliness. Spray entire face of grommet with a light
coat of Plastic Mold Spray, SM-O-O-TH Silicone Spray or equivalent. This will
prevent harness grommet from sticking to magneto distributor block.
a. Place the harness terminal plate on the magneto and tighten nuts around the
plate alternately to seat cover squarely on magneto. Torque nuts to 18 to 22 inch
pounds.
b. Route ignition wires to their respective cylinders.
c. Clamp the harness assembly in position and replace the engine baffle plate.
d. Connect the leads to the spark plugs.
8-41.

SPARK PLUGS.

8-42. REMOVAL OF SPARK PLUGS.
a. Loosen the coupling nut onthe harness
lator from the spark plug barrel well.

lead and remove the terminal insu-

NOTE
When withdrawing the ignition cable lead connection
from the plug, care must be taken to pull the lead
straight out and in line with the center line of the plug
barrel; otherwise, a side load will be applied which
frequently results in damage to the barrel insulator
and connector. If the lead cannot be removed easily in
this manner, the resisting contact between the neoprene collar and the barrel insulator will be broken by
a rotary twisting of the collar. Avoid undue distortion
of the collar and possible side loading of the barrel
insulator.
b. Remove the spark plug from the engine. Inthe course of engine operation,
carbon and other combustion products will be deposited on the end of the spark
plug and will penetrate the lower threads to some degree. As a result, greater
Actorque is frequently required for removing a plug than for its installation.

Reissued: 1/15/81

2L12

POWER PLANT

PIPERCHEROKEE
SERVICEMANUAL

cordingly, the torque limitations given
do not apply to plug removal and sufficient torque must be used to unscrew
the plug. The higher torque in removal
is not as detrimental as in installation,
since it cannot stretch the threaded section. It does, however, impose a shearing load on this section and may, if sufficiently severe, produce a failure in
this location.

234

NOTE
Torque indicating handle
should not be used for spark
plug removal because of the
greater
torque requirement.

Figure 8-20. Removing Spark Plug
Frozen to Bushing

c. Place spark plugs in a tray that will identify their position in the engine as
soon as they are removed.
NOTE
Spark plugs should not be used if they have been dropped.
d. Removal of seized spark plugs inthe cylinder may be accomplished by application of liquid carbon dioxide by a Conical metal funnel adapter with a hole at
the apex just large enough to accommodate the funnel of a CO2 bottle. (Refer to
Figure 8-20.) When a seized spark plug cannot be removed by normal means,
the funnel adapter is placed over and around the spark plug. Place the funnel of
the CO2 bottle inside the funnel adapter and release the carbon dioxide to chill
and contract the spark plug. Break the spark plug loose with a wrench. A warm
cylinder head at the time the carbon dioxide is applied will aid in the removal of
an excessively seized plug.
e. Do not allow foreign objects to enter the spark plug hole.

Reissued: 1/15/81

2L13

POWER PLANT

PIPER CHEROKEE SERVICE MANUAL

8-43. INSPECTION AND CLEANING OF SPARK PLUG.
a. Visually inspect each spark plug for the following non-repairable defects:
1. Severely damaged shell or shield threads nicked up, stripped or crossthreaded.
2. Badly battered or rounded shell hexagons.
3. Out-of-round or damaged shielding barrel.
4. Chipped, cracked, or broken ceramic insulator portions.
5. Badly eroded electrodes worn to approximately 50% of original size.
b. Clean the sparkplug as required, removing carbon and foreign deposits.
c. Test the spark plug both electrically and for resistance.
d. Set the electrode gap at .015 to .018 of an inch or if a smoother operation
at idle speed and reduced magneto drop-off is desired, set at .018 to .022 of an
inch. However, with wide gap setting the plugs must be serviced at more frequent intervals.
Fine wire platinum or iridium electrodes should be set at .015
to .018 of an inch only.
8-44. INSTALLATION OF SPARK PLUGS. Before installing spark plugs, ascertain that the threads within the cylinder are clean and not damaged.
a. Apply anti-seize compound sparingly on the threads and install gasket and
spark plugs. Torque 360 to 420 inch pounds.
CAUTION
Make certainthe deep socketis properly seated on the
spark plug hexagon as damage to the plug could result
if the wrench is cocked to one side when pressure is
applied.
b. Carefully insert the terminal
coupling nut.
8-45.

insulator

in the spark plug and tighten the

LUBRICATION SYSTEM.

8-46. OIL PRESSURE RELIEF VALVE. Subject engines may be equipped with
either an adjustable or non-adjustable oil pressure relief valve. A brief description of both types follows:
a. Non-adjustable Oil Pressure Relief Valve - The valve is notadjustable; however, the pressure can be controlled by the addition of a maximum of three STD425 washers under the cap to increase pressure or the use of a spacer (Lycoming

Reissued: 1/15/81

2L14

POWER PLANT

PIPER CHEROKEESERVICE MANUAL

P N 73629or 73630)to decrease pressure. Particles of metal or otherforeign matter lodgedbetween the ball and seat will result in a drop in oil pressure. It is advisable, therefore, to disassemble. inspect, and clean the valve if excessivepressure fluctuations are noted. The oil pressure relief valve is not to be mistaken for the oil cooler by-pass valve, whose function is to permit pressure oil to by-pass the oil cooler in case of an obstruction.
b. Adjustable Oil Pressure Relief Valve- The adjustable oil pressure relief valve enables
the operator to maintain engine oil pressure within the specified limits (refer to the engine
manufacturer's appropriate manual). The valve is located above and to the rear of No. 3
cylinder. If the pressure under normal operating conditions should consistently exceed 90
psi.. or run less than 60 psi.. adjust the valve as follows:
With the engine thoroughly warmed up and running at a maximum of 2200 RPM.
observe the reading on the oil pressure gauge. If the pressure is above 90 psi.. stop engine.
loosen the adjusting lock nut: and back off the adjusting screw one or two full turns. Tighten
lock nut and retest. If pressure istoo low.turn adjusting screwfurther into the reliefvalveplug.
thereby increasing the tension on the relief valve spring. When the valvehas beensatisfactorily
adjusted. tighten the lock nut and lockwirethe crown nut to the drilled ear projectingfrom the
valve mounting boss.
8-47. SWITCHING.
8-48. REMOVAL OF IGNITION SWITCH.
a. Insure the ignition switch is in the off position.
b. Gain access to and disconnect the power lead (+) from the battery.
c. Remove the ignition switch retaining nut from the switch on the forward side of the
instrument panel and withdraw the switch from the panel.
d. Mark the wires and note their position on the switch. then disconnect the wires.
8-49. INSTALLATION OF IGNITION SWITCH. (Refer to Figure 8-21.)
a. Attach wires to the switch as shown in Figure 8-21.
b. Position the ignition switch in the instrument panel and secure with retaining nut.
c. Connect the power lead (-) to the battery and reinstall any access covers previously
removed.

Revised: 8 3 81

2L15

POWER PLANT

PIPER CHEROKEE SERVICE MANUAL

C216

PA-28-180..S/N 28-7505001 AND UP
PA-28-235. S/N 28-7510001 AND UP

J2A

K1B

GND

C236

PA-28-140. S/N 28-25000 AND UP
PA-28-180. S/N 28-4378 TO 28-7405290
PA-28-235, S/N 28-11040 TO 7410120

B

Figure 8-21. Ignition Switch WiringPositions

Added: 8 3 81

2L16

POWER PLANT

PIPER CHEROKEE SERVICE MANUAL

TABLE VIII-I.
Trouble
Failure of engine to
start.

Reissued:1/15/81

ENGINE TROUBLESHOOTINGCHART
Cause

Remedy

Lack of fuel.

Check fuel system for
leaks.
Fill fuel tank.
Clean dirty lines,
strainers, or fuel
cocks.

Underpriming.

Prime with two or three
strokes of primer.

Overpriming.

Open throttle and "unload" engine by turning in counter-clockwise direction.

Incorrect throttle setting.

Open throttle to onetenth of its range.

Defective spark plugs.

Clean and adjust or replace spark plug or
plugs. Refer to
Table I for spark plug
gap adjustments.

Defective ignition wire.

Check with electric tester and replace any
defective wires.

Improper operation of
magneto breaker
points.

Check internal timing
of magnetos.
Check points.

Internal failure.

Check oil sump screen
for metal particles.
If found, complete
overhaul of the engine may be indicated.

2L17

POWER PLANT

PIPER CHEROKEE SERVICE MANUAL

TABLE VIII-II. ENGINE TROUBLESHOOTING CHART (cont)
Trouble

Failure of engine
to start. (cont)

Failure of engine to
idle properly.

Reissued:1/15/81

Cause

Remedy

Improper switch wiring
for left magneto
starting.

Reverse magneto switch
wires.

Magnetized impulse
coupling - left magneto only.

Demagnetize impulse
couplings.

Frozen spark plug
electrodes.

Replace spark plugs or
dry out removed
plugs.

Mixture control in idle
cut-off.

Open mixture control.

Shorted ignition switch
or loose ground.

Check and replace or
repair.

Incorrect carburetor
idle adjustment.

Adjust throttle stop to
obtain correct idle.

Idle mixture.

Adjust mixture. Refer
to engine manufacturer's handbook for
proper procedure.

Leak in the induction
system.

Tighten all connections
in the induction system. Replace any
parts that are defective.

Low cylinder compression.

Check cylinder compression.

2L18

POWER PLANT

PIPER CHEROKEESERVICEMANUAL

TABLEVII-II.

ENGINE TROUBLESHOOTINGCHART (cont)
Remedy

Trouble

Cause

Failure of engine to
idle properly. (cont)

Faulty ignition system.

Check entire ignition
system.

Open primer..

Lock primer.

Improper spark plug
setting for altitude.

Check spark plug gap.

Dirty air filter.

Clean or replace.

Mixture too rich; indicated by sluggish
engine operation,
red exhaust flame
and black smoke.

Check primer. Read- djustment of carburetor indicated.

Mixture too lean; indicated by overheating or backfiring.

Check fuel lines for dirt
or other restrictions.
Check fuel supply.

Leaks in induction
system.

Tighten all connections.
Replace defective
parts.

Defective spark plugs.

Clean or replace spark
plug.

Improper grade-of
fuel.

Fill tank with recommended grade.

Magneto breaker
points not working
properly.

Clean points.
Check internal timing of
magneto.

Defective ignition wire.

Check wire with elecReplace
tric tester.

Low power and uneven
running engine.

Reissued:1/15/81

2L19

POWER PLANT

PIPER CHEROKEE SERVICE MANUAL

TABLEVIII-II.
Trouble

ENGINE TROUBLESHOOTING CHART (cont)
Cause

Low power and uneven
running engine. (cont)

Failure of engine to
develop full power.

Remedy

defective wire.

Defective spark plug
terminal connectors.

Replace connectors
spark plug wire.

Restriction
system.

Check for loose muffler
baffles.

in exhaust

on

Improper ignition timing.

Check magnetos for
trimming and
synchronization.

Throttle lever out of
adjustment.

Adjust throttle lever.

Leak in induction
system.

Tighten all connections,
and replace defective
parts.

Restriction in carburetor air scoop.

Examine air scoop and
remove restriction.

Improper fuel.

Fill tank with recommended fuel.

Faulty ignition.

Tighten all connections.
Check system. Check
ignition timing.

Reissued: 1/15/81

2L20

POWER PLANT

PIPER CHEROKEE SERVICE MANUAL

TABLE VIII-II.
Trouble

Rough running engine.

Low oil pressure.

Reissued: 1/15/81

ENGINE TROUBLESHOOTINGCHART (cont)
Cause

Remedy

Cracked engine mounts.

Repair or replace engine
mount.

Unbalanced propeller.

Remove propeller and
have it checked for
balance.

Bent propeller blades.

Check propeller for
track.

Defective mounting.

Install new mounting
bushings.

Lead deposit on spark
plug.

Clean or replace plugs.

Malfunctioning engine.

Check entire engine.

Insufficient oil.

Check oil supply.

Dirty oil screens.

Remove and clean oil
screens.

Defective pressure
gauge.

Replace gauge.

Air lock or dirt in
relief valve.

Remove and clean oil
pressure relief valve.

Leak in suction line or
pressure line.

Check gasket between
accessory housing
crankcase.

High oil temperature.

See "High Oil Temperature" in Trouble
Column.

2L21

POWER PLANT

PIPER CHEROKEE SERVICE MANUAL

TABLEVIII-II. ENGINE TROUBLESHOOTING CHART(cont)
Trouble

Low oil pressure.
(cont)

High oil temperature.

Reissued:1/15/81

Remedy

Cause

Stoppage in oil pump
intake passage.

Check line for obstruction. Clean suction
screen.

Worn or scored
bearings.

Overhaul.

Insufficient air cooling.

Check air inlet and outlet for deformation
or obstruction.

Insufficient oil supply.

Fill oil sump to proper
level.

Clogged oil lines or
screens.

Remove and clean oil
screens.

Failing or failed bearing.

Examine sump for metal
particles and, if
found, overhaul
engine.

Defective thermostats.

Replace.

Defective temperature gauge.

Replace gauge.

Excessive blow-by.

Usually caused by weak
or stuck rings. Overhaul.

Improper engine operation.

Check entire engine.

2L22

POWER PLANT

CHEROKEE

MANUAL
SERVICE
CARD3 OF4
PA-28-140
PA-28-150
PA-28-160
PA-28-180
PA-28-235
PA-28R-180
PA-28R-200

CORPORATION
PIPERAIRCRAFT
753586)
(PARTNUMBER

3A1

PIPER CHEROKEESERVICEMANUAL
AEROFICHE EXPLANATION AND REVISION STATUS
The Service Manual information incorporated in this set of Aerofiche cards has been arranged in
accordance with the general specifications of Aerofiche adopted by the General Aviation Manufacturer's
Association, (GAMA). The information compiled in this Aerofiche Service Manual willbe kept current by
revisions distributed periodically. These revisionswill supersede all previous revisionsand willbe complete
Aerofiche card replacements and shall supersede Aerofiche cards of the same number in the set.
Conversion of Aerofiche alpha/numeric code numbers:
First number is the Aerofiche card number.
Letter is the horizontal line reference per card.
Second number is the vertical line reference per card.
Example: 2J16 = Aerofiche card number two of given set, Grid location J16.
To aid in locating the various chapters and related service information desired,the followingis provided:
A complete manual Table of Contents is for all fiche in this set.
A complete list of Illustrations is given and follows the Table of Contents.
A complete list of Tables is given for all fiche in this set and follows the list of Illustrations.
A complete list of paragraph titles and appropriate Grid locationnumbers is givenat the beginningof
each Chapter relating to the information within that Chapter.
5. Identification of Revised Material:
Revisedtext and illustrations are indicated by a black vertical line along the left-hand marginof
the frame, opposite revised,added or deleted material. Revision linesindicate only current revisions
with changes and additions to or deletionsof existingtext and illustrations.Changesin capitalization,
spelling, punctuation, indexing, the physical location of the material or completepageadditions are
not identified by revision lines.
6. Revisions to this Service Manual 753 586 issued August 16, 1972are as follows:
1.
2.
3.
4.

Effectivity

Publication Date

ORG720816
CR810115
PR810803
PR831003
PR840423
PR860115
IR860730
IR870506*

August 16, 1972
January 15, 1981
August 3, 1981
October 3, 1983
April 23, 1984
January 15, 1986
July 30, 1986
June 12,1987

Aerofiche Card Effectivity
1, 2, 3 and
1, 2, 3 and
1, 2, 3 and
1, 2, 3 and
1 and 3
1
1

4
4
4
4

This publication contains material revisedas of January 15, 1986(with two interim revisionseffectiveJuly
30, 1986and May 6, 1987).

* INTERIM CHANGE
Revisions appear in Table III-I and Table III-II of card 1.
There are no other changes included in this maintenance
manual.Pleasediscardyour currentcard 1 and replaceit with
this revisedone. DO NOT DISCARD CARDS 2, 3, or 4.
The date on Aerofiche cards should not be earlier than the date noted for the respectivecard effectivity.
Consult the latest card in this series for current Aerofiche card effectivity.

3A2

AIX
IIIX

NIIV

IIX
8V

33

8

IX

X

8

X
VIIIA

III
VIIA
IIA
IA
A

S3

Al
II

. ... . .. . . . .

I
L'ONO

S

PIPER CHEROKEE SERVICE MANUAL

LIST OF ILLUSTRATIONS (cont.)
Figure

Aerofiche
Grid No.

8A-1.
8A-2.
8A-3.
8A-4.

Propeller Installation ........................................
Typical Nicks and Removal Method ............................
Propeller Governor ...........................................
Engine Installation, PA-28R-180 ...............................

3A12
3A13
3A16
3A19

8A-5.

Engine Installation, PA-28R-200 ...............................

3A21

8A-6.
8A-7.
8A-8.
8A-9.

3BI
3B3
3B4
3B6

8A-11.
8A-12.
8A-13.
8A-14.
8A-15.
8A-16.
8A-17.
8A-18.
8A-19.

Adjustment of Engine Controls .................................
Fuel Injector .................................................
Schematic Diagram of RSA Fuel Injection System ................
Fuel-Air Bleed Nozzle.........................................
Contact Points ..........
...
.................
...........
Rotor Holding Tool Installed ....
..............................
Timing Kit Installed ..........................................
Aligning Timing Marks .......................................
Checking Flyweight Clearance of Impulse Coupling ...............
Engine Timing Marks .....................
...................
Magneto Adjustment Limits ...................................
Magneto Timing Marks ........................
...............
Removing Spring From Lead Assembly .........................
Assembly Tool ...............................................

8A-20.

Using Assembly Tool ......................................

8A-21.
8A-22.
8A-23.
8A-24.
8A-25.
8A-26.
8A-27.
8A-28.
8A-29.
8A-30.
8A-31.
8A-32.
9-1.
9-2.

Measuring Lead Assembly Length ..............................
Cutting Metallic Braid From End of Lead .......................
Unbraiding Metallic Shielding..................................
Forming Shielding Around Ferrule .............................
Ferrule Seating Tool ..........................................
Needle ......................................................
Measuring Wire From Top of Ferrule ...........................
Installing Grommet Over Lead Assemblies.......................
Lead Assembly Installed in Grommet ...........................
Wire Doubled Over For Installation of Eyelet ....................
Removing Spark Plug Frozen to Bushing ........................
Ignition Switch Wiring Positions ......................
.........
Fuel System Diagram, PA-28-140,-150, -160, -180 ................
Fuel System Diagram, PA-28-235, Serial Nos. 28-10003
to 28-10719incl...........................................

3B 17
3B18
3B18
3B19
3B19
3B19
3B20
3B20
3B20
3B20
3B22
3B24
3C11

9-3.

Fuel System Diagram, PA-28-235, Serial Nos. 28-10720 and up ....

3C13

9-4.
9-5.
9-6.
9-7.
9-8.
9-9.

Fuel System Diagram, PA-28R .................................
Deleted .....................................................
Fuel Quantity Transmitter (P/N 62037-00).......................
Fuel Quantity Transmitter (P/N 68101-00).......................
Fuel Selector and Filter, PA-28-235 .............................
Fuel Filter, PA-28-235 ........................................

3C14

8A-10.

Revised: 8/3/81

3A4

3B8

3B10
3B10
3B11
3B 12
3B13
3B14
3B14
3B16
3B16
.

3B 17

3C12

3C21
3C21
3C24
3DI

PIPER CHEROKEE SERVICE MANUAL

LIST OF ILLUSTRATIONS(cont.)
Aerofiche
Grid No.

Figure
9-10.
9-11.
9-12.

Fuel Filter Bowl and Screen (PA-28-140, -150, -160, -180
and PA-28R) ..............................
Plunger Fuel Pump (Early), PA-28-150, -160, -180 ..........
Plunger Fuel Pump (Late), PA-28-140, -150, -160, -180,

-235
9-13.
9-14.
10-1.
10-2.
10-3.
10-4.
10-5.
10-6.
10-7..
10-8.
10-9.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3D6

Engine Primer ...............................
Fabricated Fuel Quantity Transmitter Checking Jig ..........
Instrument Panel, PA-28-140, Serial Nos. 28-25000 to
............................
28-26956 incl.
Instrument Panel, PA-28-140, Serial Nos. 28-7125001 to
28-7325684 incl ...........................
Instrument Panel, PA-28-140, Serial Nos. 28-7425001
and up .. ... ... .. . ... . .. ... ... ... ... . .. .
Instrument Panel ..............................
Instrument Panel, PA-28-150, -160, -180, Serial Nos.
28-1761 to 28-4377 incl .......
Instrument Panel, PA-28-180, Serial Nos. 284378 to
..........
28-7205328 incl .
Instrument Panel, PA-28-180, Serial Nos. 28-7305001 to
..........
28-7305611 incl .
Instrument Panel, PA-28-180, Serial Nos. 28-7405001 and up ...
Instrument Panel, PA-28-235, Serial Nos. 28-10720 to
28-11039 incl..............
Instrument Panel, PA-28-235, Serial Nos. 28-11040 to
..........
28-7210033 incl .
Instrument Panel, PA-28-235, Serial Nos. 28-7310001 to
..........
28-7310187 incl .
Instrument Panel. PA-28-235, Serial Nos. 28-7410001 and up ....
Instrument Panel, PA-28R-180, Serial Nos. 28-30005 to
28-30879 incl.............................
Instrument Panel, PA-28R-180, Serial Nos. 28-30880 to
28-7130019 incl.; PA-28R-200, Serial Nos. 28-30482,
28-35001 to 28-35830 incl. and 28-7135001 to
..........................
28-7135238 incl .
Instrument Panel, PA-28R-200, Serial Nos. 28-7235001 to
..........................
28-7335455 incl .
Instrument Panel. PA-28R-200. Serial Nos. 28-7435001 and up . . .
Warning Light Pressure Switch ......................
Typical Pitot Static System, PA-28-140,-150,-160, -180,-235,
PA-28R-180 and 200 .........................
EGT Probe Location (PA-28R-180 and 200) ....................
EGT Probe Location (PA-28-235) .............................
EGT Probe Location (PA-28-150/ 160/180) S/N 1761 and up . ...
.

10-10.

.

·

10-11.
10-12.
10-13.
10-14.

10-15.
10-16.
10-17.
10-18.
10-19.
10-20.
10-21.

Reissued: 1/15/81

3D3
3D6

3A5

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

..

.

3D12
3D17
3E4
3E5
3E6
3E7
3E8
3E9
3E10
3E11
3E12
3E13
3E14
3E15
3E16

3E17
3E18
3E19
3E23
3F4
3 F24
3G1
3G2

PIPER CHEROKEE SERVICE MANUAL

LISTOFTABLES
Table
VIIIA-I
IIA-I.
IX-I.
IX-II.
IX-III.
X-I.
X-II.
X-III.
X-IV.
X-V.
X-VI.
X-VII.
X-VIII.
X-IX.
X-X.
X-XI.
X-XII.
X-XIII.
X-XIV.
X-XV.
X-XVI.
X-XVII.

Reissued: 1/15/81

. ... . .. . ..
Engine Troubleshooting Chart ...........
. .. . . .. . .. .
Transmitter/Fuel Gauge Tolerances ........
Fuel Quantity Transmitter Calibration Tolerances . . .. . . . ... .
. ... .. . . .. .
Fuel System Troubleshooting .....
. ... . . . ... .
Vacuum System ...................
. . .. ... ... .
Directional Gyro Indicator .............
. ... .. . ... .
Gyro Horizon Indicator ...............
Rate of Climb Indicator ...............
. ... . .. . .. .
Altimeter ...........
. . .. . .. .. ..
Airspeed Tubes and Indicator .....
. ... .. . .. ..
MagneticCompass ...........
......
. ... .. . .. . .
ManifoldPressure Indicator ............
. .. . . .. ... .
Tachometer......................
. ... .. . . .. .
Engine Oil PressureGauge ......
. ... . . . ... .
Fuel PressureGauge .................
. .. . . .. ... .
Turn and Bank Indicator ..............
. ... . . . ... .
Fuel Quantity Indicators ... ......
.....
. ... ... ... .
Oil Temperature Indicators ......
......
. . .. .. . .. . .
Troubleshooting EGT Gauge ............
. . .. . .. ... .
Cylinder Head Temperature Gauge ...
. .. .. . ... ..
Fuel Flow Gauge .................
... . .. . ....

3A6

Aerofiche
Grid No.
3C1
3C20
3C21
3D15
3D24
3F5
3F7
3F8
3F10
3F12
3F 14
3F15
3F 16
3F17
3F18
3F19
3F20
3F21
3F23
3G3
3G4

3A7
INTENTIONALLY LEFT BLANK

PIPER CHEROKEE SERVICE MANUAL

SECTION VIIIA
POWER PLANT
(PA-28R)
Aerofiche
Grid No.

Paragraph
8A-1.
8A-2.
8A-3.
8A-4.

8A-9.

8A-13.
8A-16.
8A-17.
8A-18.
8A-19.
8A-20.
8A-22.
8A-23.

8A-27.
8A-28.

Introduction .................................................
Description ...............................................
Troubleshooting ..............................................
Propeller ....................................................
Removal of Propeller ................................
8A-5.
8A-6.
Cleaning, Inspection and Repair of Propeller ............
8A-7.
Installing Propeller ..................................
8A-8.
Blade Track .........................................
Propeller Governor ...........................................
8A-10. Removal of Propeller Governor .......................
8A- 11. Installation of Propeller Governor .....................
8A-12. Rigging and Adjustment of Propeller Governor..........
Engine ......................................................
..............
8A-14. Removal of Engine .................
8A-15. Installation of Engine ................................
Installation of Oil Cooler .....................................
Adjustment of Throttle and Mixture Controls ....................
Induction Air Filter. ..........................................
Alternate Air Door ...........................................
Fuel Injector ................................................
8A-21. Fuel Injector Maintenance ............................
Adjustment of Idle Speed and Mixture ..........................
Fuel Air Bleed Nozzle.........................................
8A-24. Removal of Fuel-Air Bleed Nozzle .....................
8A-25. Cleaning and Inspection of Fuel-Air Bleed
Nozzle ........................................
8A-26. Installation of Fuel-Air Bleed Nozzle ...................
Ignition System Maintenance ..................................
Magneto ....................................................
8A-29. Inspection of Magneto ...............................

3A10
3A10
3A10
3A11
3A11
3A11
3A13
3A14
3A14
3A14
3A14
3A15
3A16
3A16
3A17
3A24
3B 1
3B2
3B2
3B3
3B3
3B5
3B6
3B6

8A-30.

3B9

8A-31.
8A-32.

Reissued: 1/15/81

-Removal of Magneto .................................

Timing Procedure (Internal Timing) ....................
Installation and Timing Procedure (Timing
Magneto to Engine) ..............................

3A8

3B6
3B6
3B7
3B7
3B7
3B9
3B 12

PIPER CHEROKEE SERVICE MANUAL

Paragraph
8A-33.

8A-38.

8A-42.
8A-44.

Aerofiche
Grid No.

Harness Assembly ............................................
8A-34. Inspection of Harness ................................
8A-35. Removal of Harness .................................
8A-36. Maintenance of Harness ..............................
8A-37. Installation of Harness ......................
.........
Spark Plugs .................................................
8A-39. Removal of Spark Plugs ..............................
8A-40. Inspection and Cleaning of Spark Plug .................
8A-41. Installation of Spark Plugs ............................
Lubrication System ...........................................
8A-43. Oil Pressure Relief Valve .............................
Switching ...............................
....................
8A-45. Removal of Ignition Switch .....
......................
8A-46. Installation of Ignition Switch .........................

Revised: 8/3/81

3A9

3B15
3B15
3B15
3B15
3B21
3B21
3B21
3B23
3B23
3B23
3B23
3B24
3B24
3B24

PIPER CHEROKEE SERVICE MANUAL

SECTIONVIIIA
POWERPLANT
(PA-28R)
8A-1. INTRODUCTION.This section covers the power plant used in PA-28R-180airplanes
and is comprised of instructions for the removal, minor repair, serviceand installation of the
propeller, propeller governor, engine, induction system, fuel injector, fuel air bleed nozzle,
ignition system and lubrication system.
For further instructions on major repairs, consult the appropriate publication of the
engine or component manufacturer.
8A-2. DESCRIPTION. The PA-28R-180 is powered by an Avco-Lycoming IO-360-B1E
engine of 180 horsepower and the PA-28R-200 is powered by an Avco-Lycoming
IO-360-C1Cengine of 200 horsepower. (Refer to Power Plant Specificationsin Table II-I.)
The engines are furnished with starters, 60 ampere, 14-volt alternators, voltage regulators,
shielded ignition systems, vacuum pump drive, fuel pump, fuel injector and dry paper type
induction air filter. An alternate air door that will open automatically in the event of air
stoppage through the filter or may be operated manually with the use of a control in the
cockpit is provided in the induction system.
The exhaust system is constructed of stainless steel, directing gasesinboard to a muffler
located directly under the engine. The large muffler with a heater shroud provides heat for
both the cabin and defrosting.
The engines are provided with a constant speed propeller controlled by a governor
mounted on the engine supplying oil through the propeller shaft at various pressures.
Service of both engines is identical and wherever there is any difference in service
instructions it will be so noted.
8A-3. TROUBLESHOOTING.Troubles peculiar to the power plant are listed in Table
VIIIA-I along with their probable causes and suggestedremedies. Whentroubleshooting the
engine, ground the magneto primary circuit before performing any checks of the engine.

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PIPER CHEROKEE SERVICE MANUAL

8A-4.

PROPELLER.

8A-5. REMOVAL OF PROPELLER.
a. Insure master and magneto switches are off.
b. Move fuel selector to off position.
c. Place mixture control in idle cut-off.
d. Note position of components to facilitate reinstallation.
e. Remove screws from the spinner assembly and remove spinner.
f. Remove the-safety wire from the six propeller mounting nuts on studs and
remove studs.
g. Place a drip pan under propeller to catch oil spillage, remove propeller.
8A-6. CLEANING, INSPECTION AND REPAIR OF PROPELLER.
a. Check for oil and grease leaks.
b. Clean the spinner, propeller hub interior and exterior, and blades with a
non-corrosive solvent.
c. Inspect the hub parts for cracks.
d. Steel hub parts should not be permitted to rust. Use aluminum paint to
touch up if found necessary.
e. Check all visible parts for wear and safety.
f. Check blades to determine whether they turn freely on the hub pivot tube.
This can be done by rocking the blades back and forth through the slight freedom
allowed by the pitch change mechanism. If they appear tight and are properly
lubricated, the pitch change mechanism should be removed so that -each blade can
be checked individually. If blades are tight, the propeller should be disassembled.
g. Inspect blades for damage or cracks. Nicks in leading edges of blades
should be filed out and all edges rounded, as cracks sometimes start from such
places. Use fine emery cloth for finishing. Refer to Figure 8A-2 for propeller
blade care.
h. It is recommended that for severe damage, internal repairs and replacement of parts, the propeller should be referredto the Hartzell Factory or Service
Station.
i. Grease blade hub through zerk fittings. Remove one of the two fittings for
each propeller blade, alternate the next time. Apply grease through the zerk fitting until fresh grease appears at the fitting hole of the removed fitting. Care
should be taken to avoid blowing out hub gaskets.
j . Checkconditionof propeller mounting nuts onstuds,

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3All

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PIPER CHEROKEE SERVICE MANUAL

1801

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
II.
12.
13.
14.

LOW PITCH STOP
JAM NUT
PROPELLER HUB
SPINNER
PROPELLER BLADE
SPINNER BACK PLATE
STARTER RING
"O"
RING SEAL
GREASE FITTING
WASHER
NUT
SAFETY WIRE
STUD
NUT, FLYWHEEL

\14

Figure 8A-1.

Reissued: 1/15/81

Propeller Installation

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PIPER CHEROKEE SERVICE MANUAL

C345

A

Exaggerated
view of nicks
in leading edge.

Exaggerate
I view of nick
blade
in faceof blade

A

Recommended
methodfor removing
nicksby riffle file and crocus cloth.
Blenddeepestportionof nick into
leadingedge alignmentwith smooth
curves.

Figure 8A-2

SECTIONAANick in face of blade
removedby file and
crocuscloth as recommended

Typical Nicks and Removal Method

8A-7. INSTALLING PROPELLER.
a. Insure master and magneto switches are off.
b. Place fuel selector to off position.
c. Place mixture control in idle cut-off.
d. Observe the starter ring gear to make sure it is mounted properly on the
engine crankshaft flange. One of the bushings on the crankshaft is stamped with
an "O" mark and it must be inserted in the starter ring gear hole, likewise identified with an "O" mark.
e. Wipe crankshaftand propeller pilot to assure that no chips or foreign matter enter the propeller mechanism.
f. Check interior of propeller hub for proper seating of "O" ring. Wipe inside of hub to remove any traces of dirt. Check to see that "O" ring is covered
with grease.
g. Raise propeller into position so that each stud mates with an engine flange.
bushing, and screw each stud in a few turns at a time until all are tight. Torque
to 55 to 65 foot pounds.
h. Check the propeller blade track as given in paragraph 8A-8.

Revised: 10/3/83

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PIPER CHEROKEE SERVICE MANUAL

i.
j.

Safety the propeller mounting bolts with MS20995-C41 safety wire.
Install the spinner, torque cap bolts 35 to 40 inch pounds.

8A-8. BLADE TRACK. Blade track is the ability of one blade tip to follow the
other, while rotating, in almost the same plane. Excessive difference in blade
track - more than .0625 inch - may be an indication of bent blades or improper
propeller installation.
Check blade track as follows:
a. With the engine shut down and blades vertical, secure to the aircraft a
smooth board just under the tip of the lower blade. Move the tip fore and aft
through its full "blade-shake" travel, making small marks with a pencil at each
position. Then center the tip between these marks and scribe a line on the board
for the full width of the tip.
b. Carefully rotatepropeller by hand to bring the opposite blade down. Center
the tip and scribe a pencil line as before and check that lines are not separated
more than .0625 inch.
c. Propellers having excess blade track should be removed and inspected for
bent blades, or for parts of sheared "O" ring, or foreign particles, which have
lodged between hub and crankshaft mounting faces. Bent blades will require repair and overhaul of assembly.
8A-9.

PROPELLER GOVERNOR.

8A-10. REMOVAL OF PROPELLER GOVERNOR.
a. Remove the upper engine cowl.
b. Disconnect the control cable end from the governor control arm.
c. Remove the governor mounting stud nuts. It will be necessary to raise the
governor as the nuts are being removed before the nuts can be completely removed.
d. Remove the mounting gasket. If the governor is to be removed for a considerable length of time and another unit not substituted, it is advisable to cover
the mounting pad to prevent damage caused by foreign matter.
8A-11. INSTALLATION OF PROPELLER GOVERNOR.
a. Clean the mounting pad thoroughly, making very certain that there are no
foreign particles in the recess around the drive shaft.
b. Place the governor mounting gasket in position with the raised portion of
the screen facing away from the engine.
c. Align the splines on the governor shaft with the engine drive and slide the

Reissued:1/15/81

3A14

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PIPER CHEROKEE SERVICE MANUAL

governor into position.
d. With the governor in position, raise the governor enough to install washers and start mounting nuts. Torque nuts even.
e. Connect the control cable end to the governor control arm. The ball stud
is installed in the inner hole of the control arm.
f. Adjust governor control per paragraph 8A-12.
g. Install engine cowl.
8A-12. RIGGING AND ADJUSTMENT OF PROPELLER GOVERNOR. (Refer to
Figure 8A-3.)
a. Start engine, park 90° to wind direction and warm in normal manner.
b. To check high RPM, low pitch setting, move the propeller control all the
way forward. At this position the governor speed control arm (1) should be against
the high RPM fine adjusting screw (2). With the throttle full forward, observe
engine RPM, which should be 2700 RPM with high RPM properly adjusted.
c. Should engine RPM not be as required, the high RPM setting should be adjusted as follows:
1. Shut down the engine and remove the upper engine cowl.
2. Adjust the governor by means of the fine adjustment screw (2) for 2700
RPM. To do this, loosen the high RPM fine adjustment screw lock nut and turn
the screw in a clockwise direction to decrease engine speed or in a counterclockwise direction to increase engine speed.
NOTE
One revolution of the fine adjustment screw will increase or decreasethe engine speedapproximately 20
RPM.
3. Reinstall upper engine cowl and repeat step b to ascertain proper RPM
setting.
4. After setting the proper high RPM adjustment, run the self-locking nut
on the fine adjustment screw against the base projection to lock.
5. Ascertain that the governor control arm (1) is adjusted to the proper
angle on the control wheel (4) as shown in Figure 8A-3.
d. With the high RPM adjustment complete, the control system should be adjusted so that the governor control arm will contact the high RPM stop when the
cockpit control knob is .032 to .047 of an inch from its full forward stop. To adjust the control knob travel, disconnect the control cable end from the control
arm, loosen the cable end jam nut and rotate the end to obtain the desired level
clearance. Reconnect the cable end and tighten jam nut.

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PIPER CHEROKEESERVICEMANUAL

e. It is usually only necessary to adjust the high RPM (low pitch) setting of
the governor control system, as the action automatically takes care of the positive low RPM (high pitch) setting.
8A-13.

A617

5

5

/3

ENGINE.

8A-14. REMOVAL OF ENGINE.
a. Turn off all electrical switches
in the cockpit

and then disconnect

the

1 .

CONTROL ARM

2. RPM ADJUSTMENT SCREW
battery ground wire at the battery.
3. LOCKNUT
b. Move the fuel selector lever in
4. CONTROL WHEEL
5. BOLT ASSEMBLY
the cockpit to "OFF".
c. Remove the engine cowlingby the
Figure 8A-3. Propeller Governor
following procedure:
1. Release the cowl fasteners, two on each side of the cowl.
2. Lift the aft end of the cowl and then slide it forward to release the two
stud type front fasteners.
Remove the top cowl.
3. Disconnect thelanding light lead at the quickdisconnect at the left rear
side of the bottom cowl.
4. Disconnect the nose gear door rods by removing the nuts, washers, and
bolts.
5. Remove the screws securing the bottom cowl at its aft end. Remove the
bottom cowl.
d. Remove the propeller. (Refer to Paragraph 8A-5.)
e. Disconnect the starter positive and ground leads at the starter, and their
attachment clamps.
f. Disconnect thegovernor control cable at the governor and cable attachment
clamps.
g. Disconnect the heater hose at the muffler.
h. Disconnect the throttle and mixture cables at the injector. (The injector
may be removed if desired.)d.
i . Remove the air filter box by removing the bolts that secure the box to its
attachment clamps. The cover may remain attached to the alternate air door
control cable.
j. Disconnect the fuel pump supply line at the left side of the pump. Disconnect the pump vent line.

Reissued: 1/15/81

3A16

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PIPER CHEROKEE SERVICE MANUAL

NOTE
Where a question may arise as where to reconnect
hose, line or wire, the item at the separation should
be identified (tagged) to facilitate reinstallation. Open
fuel, oil, vacuum lines and fittings should be covered
to prevent contamination.
k. Disconnect both lines from the oil cooler.
1. Disconnect the magneto "P" leads at the magnetos.
m. Disconnect the engine vent tube at the engine.
n. Disconnect the engine oil temperature lead at the aft end of the engine.
o. Disconnect the tachmeter drive cable at the engine.
p. Untie the ignition harness, hoses and lines at the aft end of the engine.
q. Disconnect the vacuum pump lines at pump and remove fittings from pump.
r. Disconnect the oil pressure line at the engine.
s. Disconnect the static and fuel flow line at the right rear engine baffle.
t. Disconnect the manifold pressure line at the right rear side of the engine.
u. Disconnect the injector line at the flow divider.
v. Disconnect the alternator leads and the cable attachment clamps.
w. Attach a one-half ton (minimum) hoist to the hoisting straps and relieve the
tension from the engine mounts.
NOTE
Place a tail stand under the tail of the airplane before
removing the engine.
x. Check the engine for any attachments remaining to obstruct its removal.
y. Drain the engine oil, if desired, and then close drain.
z. Remove the four engine mount assemblies and swing the engine free, being
careful not to damage any attaching parts.
8A-15. INSTALLATION OF ENGINE.
a. Attach a one-half ton (minimum) hoist to the engine hoisting straps and
swing the engine into alignment with its attaching points.
b. Insert an engine mount bolt, with washer against head, in the engine mount
and slide half of the mount assembly on the bolt. Repeat this procedure for the
other three attachment points. (Refer to Figure 8A-4.)
c. Position the mounting lugs of the engine so that they align with the engine
mount attaching points, then move the engine rearward onto the mounts.

Reissued: 1/15/81

3A17

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3A18
INTENTIONALLY LEFT BLANK

PIPER CHEROKEE SERVICE MANUAL

1727

3

of (3)
NOTE: A maximum
can be
washers
AN960-616
used to permit a maximum of
on the
exposed
2.5 threads
to
230/240
Torque
bolt.
inch-pounds.

I

1.
2.
3.
4.
5.
6.
7.
8.

AIR FILTER BOX
BAFFLE ASSEMBLY, LEFT
MAGNETO, LEFT
OIL TEMPERATURE LEAD
VACUUM PUMP
TACHOMETER CABLE
ENGINE MOUNT ASSEMBLY
MAGNETO, RIGHT

4

5 6

7 8 9

10

Section A-A

9. SHOCK MOUNT (SEE SKETCH A)
10. FLOW DIVIDER
11. OIL FILLER
12. LIFTING STRAP
13. STARTER RING GEAR
14. OIL FILTER
15. PROPELLER GOVERNOR
16. INJECTOR INLET HOSE

17.
18.
19.
20.
21.
22.
23.
24.

FUEL INJECTOR
OIL COOLER INLET HOSE (180
MANIFOLD PRESSURE LINE
BAFFLE ASSEMBLY, RIGHT
SPARK PLUGS
INJECTOR NOZZLE
INTAKE TUBE
EXHAUST STACK

Figure 8A-4.- Engine Installation

Reissued:1/15/81

11

3A19

ONLY)

25.
26.
27.
28.
29.
30.
31.

BOLT
WASHER
SPACER
SHOCK MOUNT (SILVER CODING)
SHOCK MOUNT (GOLD CODING)
ENGINE MOUNT ASSEMBLY
ENGINE .

(PA-28R-180)

POWER PLANT

PIPER CHEROKEE SERVICE MANUAL

C311

NOTE
REFERTO PIPERSERVICE LETTER NO. 910 ON OIL QUICK
DRAIN INSTALLATION

SKETCHA

VIEWBB

VIEWAA

Figure 8A-4. Engine Installation (PA-28R-180) (cont.)

Revised: 10/3/83

3A20

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PIPER CHEROKEE SERVICE MANUAL

1705
1. STARTER RING GEAR
2. FLOW DIVIDER
3. LIFTING STRAP
4. SHOCK MOUNT (SEE SKETCK A)
5. INJECTOR NOZZLE
6. OIL FILTER
7. BAFFLE ASSEMBLY, RIGHT
8. TACHOMETER CABLE
9. VACUUM PUMP
10. MAGNETO, RIGHT
11. OIL FILLER
12. MANIFOLD PRESSURE LINE
13. PROPELLER GOVERNOR
14. ENGINE MOUNT ASSEMBLY
15. EXHAUST STACK
16. SPARK PLUG

17. INTAKE TUBE
18. BAFFLE ASSEMBLY, LEFT
19. MAGNETO, LEFT
20. AIR FILTER BOX
21. FUEL PUMP
22. FUEL INJECTOR
23. OIL TEMPERTURE LEAD
24. INJECTOR INLET HOSE

25.
26.
27.
28.
29.
30.
31.

BOLT
WASHER
SPACER
SHOCK MOUNT (SILVER CODING)
SHOCK MOUNT (GOLD CODING)
ENGINE MOUNT ASSEMBLY
ENGINE

NOTE: A maximum of (3) AN960616
washers can be used to permit a max. of
25 threads exposed on the bolt. Torque
to 230/240
inch-pounds.

Figure 8A-5. Engine Installation (PA-28R-200)

Reissued: 1/15/81

3A21

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PIPER CHEROKEE SERVICE MANUAL

C311

NOTE
REFER TO PIPER SERVICE LETTER NO. 910 ON OIL QUICK
DRAIN INSTALLATION

SKETCHA

2

VIEWBB

VIEWAA
I

Figure 8A-5. Engine Installation (PA-28R-200) (cont.)

Revised: 10/3/83

3A22

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PIPER CHEROKEE SERVICE MANUAL

d. Slide onto each mounting bolt a spacer washer, spacer and the forward half of the
mount. Install washer and nut, and torque the nuts of the bolts to 450 to 500 inch pounds.
e. Connect the alternator leads and secure cable with clamps.
f. Connect the injector line to the flow divider.
g. Connect the manifold pressure line at the right rear side of the engine.
h. Connect the static and fuel flow line at the right rear engine baffle.
i. Connect the oil pressure line.
j. Install the line fitting in the vacuum pump and install lines.
k. Connect the tachometer drive cable.
1. Connect the oil temperature lead.
m. Connect the engine vent tube.
n. Connect the oil cooler.
o. Connect the magneto "P" leads. Check that magneto switch is "OFF."
p. Connect the fuel pump supply and vent line.
q. Install the injector.
r. Connect the throttle and mixture cables to the injector. Check adjustment of the
control by referring to paragraph 8A-17.
s. Connect the heater hose to the muffler.
t Install the air filter box, filter and box cover. Check adjustment of the alternate air
door by referring to Paragraph 8A-19.
u. Connect the governor control cable and secure with clamps.
v. Connect the starter positive and ground leads and secure cables with clamps.
w. Secure the ignition harness, lines, hoses, wires, etc. that may be loose.
x. Install the propeller. (Refer to Figure 8A-8.)
y. Install the cowlingby attaching the bottom cowl to the firewall and then installing
the top. Connect the electricallead to the landing light.
z. Connect the gear door retraction rods and secure with bolts, washersand nut.
aa. Install the proper grade and amount of engine oil.
ab. Turn on the fuel valve; open the throttle full and turn on the electric fuel pump.
Check the fuel lines for leaks.
NOTE
To avoid a possible high speed bearing failure resulting from a
lack of lubrication during initial starts, refer to the latest
revision of Avco-LycomingService Instruction No. 1241 for
information on pre-oiling the engine.
ac. Perform an engine operational check.

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PIPER CHEROKEE SERVICE MANUAL

8A-16. INSTALLATION OF OIL COOLER.
a. When installing fittings in the oil coolers, care should be used to prevent excessive
torque being applied to the cooler. When a rectangular fitting boss is provided, a backup
wrench should be used, employing a scissor motion, so that no load is transmitted to the
cooler. When the oil cooler has a round fitting boss, care should be taken not to permit
excessivetorque on the fittings.
b. If a pipe thread fitting is used, it should be installed only far enough to seal with
sealingcompound.
c. Apply Lubon No. 404 to all male pipe thread fittings; do not allow sealant to enter
the system.
d. If fitting cannot be positioned correctly using a torque of 10 to 15 foot-pounds,
another fitting should be used.
e. When attaching lines to the cooler, a backup wrench should be used.
f. After installation, inspect the cooler for distorted end cups.
g. Run-up engine. After run-up, check for oil leaks.

THIS SPACE INTENTIONALLYLEFT BLANK

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3A24

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PIPER CHEROKEE SERVICE MANUAL

890

COCKPIT
CONTROLS

0.010

TO 0.030

STOP

Figure 8A-6. Adjustment of Engine Controls
8A-17. ADJUSTMENTOF THROTTLE AND MIXTURE CONTROLS. (Refer to Figure
8A-6.) Throttle and mixture controls are adjusted so that when the throttle arm on the
carburetor is rotated forward against its full throttle stop and the mixture control is rotated
forward against its full rich stop, the cockpit control levers of the throttle and mixture
should have 0.010 to 0.030 of an inch spring back on instrument panel stop when in full
throttle or full rich position.
a. The throttle may be adjusted as follows:
1. At the carburetor, disconnect the clevisend of the throttle control cable from
the control arm. Loosen the jam nut that secures the clevisend.
2. Adjust the linkage by rotating the clevis end on the cable to obtain 0.010 to
0.030 of an inch spring back on instrument panel stop when in full throttle position.
3. On PA-28R aircraft equipped with air conditioning systems, a micro switch is
located below the throttle control which is set to actuate in the full open position. With the
throttle control adjusted to obtain a clearance of .010 to .030, adjust the micro switch to
actuate at this point also.
4. Reconnect the clevisend to the control arm and safety.
b. The mixture may be adjusted as follows:
1. At the carburetor, disconnect the clevis end of the mixture control cable from
the control arm. Loosen the jam nut that secures the clevis end.
2. Adjust the linkage by rotating the clevis end on the cable to obtain 0.010 to
0.030 of an inch spring back on the instrument panel stop when in full rich position.
3. Reconnect the clevisend to the control arm and safety.
c. Check security of cable casingattachments.

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PIPER CHEROKEE SERVICE MANUAL

d. Pull the throttle and mixture levers in the cockpit full aft to ascertain that the idle
screw contacts its stop and the mixture control arm contacts its lean position. On 1975
models and up, a mixture control lock is incorporated in the quadrant cover which prevents
the mixture control from being moved to the idle cutoff position inadvertently. The lock
must be depressed before the control can be moved completely aft. Ascertain that the lock
operates freely without any tendency to bind or hang up.
8A-18. INDUCTIONAIR FILTER.
a. The filter should be cleaned daily when operating in dusty conditions. If any holes
or tears are noticed, the filter must be replaced immediately.
b. Remove the filter element and shake off loose dirt by rapping on a hard flat surface,
being careful not to damage or crease the sealingends.
CAUTION
Never wash the filter element in any liquid or soak it in oil.
Never attempt to blow off dirt with compressed air.
c. The filter housing can be cleaned by wiping with a clean cloth soaked in a suitable
dry type solvent. Whenthe housing is dry, reinstall and seal the filter element.
8A-19. ALTERNATE AIR DOOR. The alternate air door is located in the cover of the
filter box to provide a source of air to the engine should there be an air stoppage through
the filter system. The followingshould be checked during inspection:
a. Check that air door seals are tight and hinge is secure.
b. Ascertain that the spring tension of the door is tight enough to allow the door to
remain closed at full engine RPM,yet should there be an air stoppage, it will be drawn open.
c. Actuate the door by pushing in on it with the fingers to determine that it is not
sticking or binding.
d. Check the cockpit control cable for free travel.
e. Check that when the control lever in the cockpit is in the open position, the cable is
adjusted to allow approximately .0625 to .125 of an inch between the actuating arm roller
and the door when fully closed.

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A616

3

1.
2.
3.
4.
5.

THROTTLE ARM
IDLE MIXTURE ADJUSTMENT
IDLE SPEED ADJUSTMENT
FUEL SCREEN
MIXTURE ARM

Figure 8A-7. Fuel Injector
8A-20. FUEL INJECTOR.
8A-21. FUEL INJECTOR MAINTENANCE.
a. In general, little attention is required between injector overhauls. However, it is
recommended that the following items be checked during periodic inspection of the engine.
1. Check tightness and lock of all nuts and screws which fasten the injector to the
engine, torquing all nuts to 135-150 inch-pounds.
2. Seat the pal type locknuts and finger tighten them against the plain nuts. After
this has been done tighten the locknuts an additional 1/3 to 1/2 turn.
3. Check all fuel lines for tightenss and evidence of leakage. A slight fuel stain
adjacent to the air bleed nozzles is not cause for concern.
4. Check throttle and mixture control rod ends and leversfor tightness and lock.
5. Remove and clean the injector inlet strainer at the first 25 hours of operation
each
50 hour inspection thereafter. Check the screen for distortion or openings in the
and
strainer. Replace for either of these conditions. Clean screen assembly in solvent and dry
with compressed air. Damaged strainer "O"rings should be replaced. To install the screen
assembly, place the gasket on the screen assembly and install the assembly in the throttle
body and tighten to 35-40 inch-pounds torque.

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C348

1/8 INCHO.D.STAINLESS
STEEL LINE

NOZZLE
(ONE PER CYLINDER)
FLOW DIVIDER VALVE
\\
\\
\\

STRAINER

FUEL INLET

\\

\\\\

SECTIONIDLE VALVE LEVER
CONNECTED TO
THROTTLE LEVER
LINKAGE

I

AA

MANUAL MIXTURE
CONTROL AND IDLE
CUT-OFF LEVER

It

IDLE SPEED

'
.

ADJUSTMENT
'

-

I
-

CONSTANT HEAD
IDLE SPRING
CONSTANT EFFORT

SPRING

IMPACTTUBE

AIR DIAPHRAGM
FUEL DIAPHRAGM
BALL SERVO VALVE

AIR INLET
I

Figure 8A-8. Schematic Diagram of RSA Fuel Injection System

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8A-22. ADJUSTMENTOF IDLE SPEEDAND MIXTURE.
a. Start the engine and warm up in the usual manner until oil and cylinder head
temperatures are normal.
b. Check magnetos. If the "mag-drop" is normal, proceed with idle adjustment.
c. Set throttle stop screw so that the engine idles at 550-600 RPM. If the RPM changes
appreciable after making the mixture adjustment during the succeedingsteps, readajust the
idle speed to the desired RPM.
d. When the idling speed has been stabilized, move the cockpit mixture control lever
with a smooth, steady pull toward the "Idle-Cut-Off" position and observe the tachometer
for any change during the leaning process. Caution must be excerised to return the mixture
control to the "Full Rich" position before the RPM can drop to a point where the engine
cuts out. An increase of more than 10 RPM while "leaning out" indicates an excessivelyrich
idle mixture. An immediate decrease in RPM (if not preceded by a momentary increase)
indicates the idle mixture is too lean.
e. If the above indicates that the idle adjustment is too rich or too lean, turn the idle
mixture adjustment in the direction required for correction, and check this new position by
repeating the above procedure. Make additional adjustments as necessary until a check
results in a momentary pick-up of approximately 5 (never more than 10) RPM. Each time
the adjustment is changed, the engine should be run up to 2000 RPM to clear the engine
before proceeding with the RPM check. Make final adjustment of the idle speed adjustment
to obtain the desired idling RPM with closed throttle. The above method aims at a setting
that will obtain maximum RPM with minimum manifold pressure. In case the setting does
not remain stable, check the idle linkage; any looseness in this linkage would cause erratic
idling. In all cases, allowance should be made for the effect of weather conditions and field
altitude upon idling adjustment.

THIS SPACEINTENTIONALLYLEFT BLANK

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8A-23.

FUEL-AIR

BLEED NOZZLE.

8A-24. REMOVAL OF FUEL-AIR
BLEED NOZZLE. The nozzles must be
carefully removed as they or the cylinders may be damaged.
a. Remove the lower engine cowl.
b. Disconnect the fuel line from the
nozzle.
c. Carefully remove the nozzle,
using the correct size deep socket.
d. Clean and inspect the nozzle as
given in Paragraph 8A-25.
Figure 8A-9. Fuel-Air
8A-25. CLEANING AND INSPECTION
Bleed Nozzle
OF FUEL-AIR BLEED NOZZLE.
a. Clean the nozzle with acetone or equivalent and blow out all foreign particles with compressed air in the direction opposite that of fuel flow. Do not use
wire or other hard objects to clean orifices.
b. Inspect the nozzle and cylinder threads for nicks, stripping or crossthreading.
c. Inspect for battered or rounded hexagons.
8A-26. INSTALLATION OF FUEL-AIR BLEED NOZZLE.
a. Install nozzle and torque 60 inch-pounds.
CAUTION
Startnozzles and line couplings by handto prevent the
possibility of cross-threading.
b. Connect fuel line to nozzle.
c. Install the engine cowl.

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8A-27.

IGNITION SYSTEM MAINTENANCE.

8A-28.

MAGNETO.
CAUTION
Ascertain that the primary circuit of both magnetos
is grounded before working on the engine.

8A-29. INSPECTION OF MAGNETO.
a. After the first 25 hour and 50. hour periods, and periodically thereafter,
the contact assemblies should be checked. Examine the points for excessive
wear or burning. Points which have deep pits or excessively burned areas should
Examine the cam follower felt for proper lubrication. If necesbe discarded.
sary, points can be cleaned by using any hard finished paper. Clean breaker
compartment with dry cloth.
b. If engine operating troubles develop which appear to be caused by the ignition system, it is advisable to check the spark plugs and wiringfirst beforeworking on the magnetos.
c. Should the trouble appear definitely associated with the magneto, the most
effective measure is to install a replacement magneto which is known to be in
satisfactory condition and send the suspected unit to the overhaul shop for test
and repair.
d. Should this not be possible, a visual inspection may disclose the source of
trouble. Remove the harness outlet plate from the magneto. Inspect for the
presence of moisture and foreign matter on the rubber grommet and high tension
outlet side of the distributor block. Check height of block contact springs, (0.422
maximum from top of the block tower to the spring). Also check for broken leads
or damaged insulation. If either is present, remove magneto and replace with
one known to be in satisfactory condition.
e. Remove the breaker cover and harness securing screws and nuts, and separate cover from magneto housing. Check contact assemblies to see that cam
follower is securely riveted to its spring. Examine the contact points for excessive wear or burning. Figure 8A-10 shown how the average contact point will
look when surfaces are separated for inspection. Desired contact surfaces have
a dull gray, sand-blasted (almost rough) or frosted appearance, over the area
where electrical contact is made. This means that points are worn in and mated
to each other, thereby providing the best possible electrical contact and highest
efficiency of performance.
f . Minor irregularities or roughness of point surfaces are not harmful (Refer

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223

NORMAL POINT IS SMOOTH
AND FLAT. SURFACE HAS
DULL GRAY "SANDBLASTED"
APPEARANCE

MINOR IRREGULARITIES SMOOTH ROLLING HILLS
AND DALES WITHOUT ANY
DEEP PITS OR HIGH PEAKS.
THIS IS A NORMAL CONDITION OF POINTWEAR.

WELL DEFINED MOUND
EXTENDING NOTICEABLY
ABOVE SURROUNDING
SURFACE. REJECT POINTS.

Figure 8A-10. Contact Points
to Figure 8A-10 center). Neither are small pits or mounds, if not too pronounced.
If there is a possibility of pit becoming deep enough to penetrate pad, Figure
8A-10, right, reject contact assembly.
NOTE
No attempt should be made to stone or dress contact
points. Should contact assembly have bad points or
show excessive wear, the complete contact assembly
should be replaced.
g. Check the condition of the cam follower felt. Squeeze felt tightly between
thumb and forefinger. If fingers are not moistened with oil, re-oil using 2 or 3
drops of Scintilla 10-391200 lubricant. Allow approximately 30 minutes for felt to
absorb the oil. Blot off the excess with a clean cloth. Too much oil may, foul contact points and cause excessive burning.
h. Check the capacitor mounting bracket for cracks or looseness. Using the
Scintilla 11-1767-1, -2 or -3 Condenser Tester or equivalent, check capacitor
for capacitance, series resistance and leakage. Capacitance shall be at least
0.30 microfarads.
i . Check magneto to engine timing as follows:
1. Connect Scintilla 11-851 Timing Light or equivalent across the contact
assembly.
2. Slowly bring the engine up to number one cylinder advance firing position as instructed in paragraph 8A-32. At this instant the timing light should go

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out. If it does, the magneto is properly timed to the engine. If the timing light
does not go out, removal of the magneto for internal timing check and inspection
is recommended.
NOTE
The magneto service instructions in this manual are
to cover minor repairs and timing. For further repairs and adjustments of the magneto, it is recommended that the manufacturer's recommended service instructions be followed.
8A-30.. REMOVAL OF MAGNETO. Before removing the magneto, make sure
magneto switches are off.
a. Remove the harness assembly terminal plate from the magneto.
WARNING
The magneto is not internally grounded; when the ground
lead is disconnected, the magneto is hot. Removing
the harness assembly terminal plate first and installing them last minimizes the danger of starting the
engine accidentally when the ground lead is removed
from the magneto.
b. Disconnect the ground lead at the magneto.
c. Remove the nuts and washers and draw the magneto from the engine.
8A-31.. TIMING PROCEDURE (Internal Timing).
a. Remove the cover to the contact(s), distributor block, etc.
b. To internally time the contact assembly of the single-breaker magnetos,
proceed as follows:
1. Loosen the nut securing the drive plate to the magneto shaft sufficiently
in order to install the Scintilla 11-8465 Rotor Holding Tool under the nut and flat
washer as shown in Figure 8A-11. Tighten the nut securely.
2. Remove the timing inspection plug from the top of the magneto. Turn
rotating magneto to proper neutral position. This position is determined by locating keyways on drive end of magnet shaft at 12 o'clock with respect to name
plate on housing. Tighten adjusting knob of 11-8465 Rotor Holding Tool until
pressure is applied on housing flange preventing magnet from turning.

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230

226

Figure 8A-11. Rotor Holding Tool
Installed

Figure 8A-12. Timing Kit Installed

3. Loosen and rotate cam until cam follower of contact assembly rests on
highest point of cam lobe. Adjust contact assembly to obtain the clearance of
0.016 of an inch. Tighten contact assembly securing screws to 20-25 inch pounds.
4. Install the 11-8693 Timing Plate Assembly and the 11-8149 Pointer Assembly of the 11-8150 Scintilla Timing Kit to breaker compartment of magneto.
(Refer to Figure 8A-12.) Align pointer assembly with the 0° mark on timing plate.
Loosen adjusting knob of 11-8465 Rotor Holding Tool and turn rotating magnet in
normal direction of rotation until pointer indexes with the respective E gap mark
(150 ± 20). Tighten adjusting knob of 11-8465 Tool and remove the 11-8149Pointer Assembly from magneto. Using a timing light, adjust contact points to just
open. This adjustment shall be made by rotating cam, in opposite direction of
rotation until contacts just open. While holding cam in this exact position, push
cam on magnet shaft as far as possible with the fingers. Extreme care must be
exercised in this operation. If cam adjustment is changed in the slightest degree,
the timing of the magneto will be thrown off. Do not drive cam on shaft with a
mallet or other instrument. Tighten the securing screw thereby drawing the cam
down, evenly and tightly. Torque screw to 16-20 inch pounds. Loosenthe 11-8465
Rotor Holding Tool adjusting knob and return rotating magnet to neutral position.
Reinstall the 11-8149 Pointer Assembly over 0° mark on timing plate. Rotate
magnet shaft in normal direction of rotation and check for opening of main contact points at E gap setting (15 + 2).
c. If the distributor block was not removed from the housing, the internal timing may be checked by turning the magneto in the normal rotation to number one
firing position (keyway up and points just opening). At this position, the reference

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226

line on the distributor block should line

up between the L and LB marks on the
gear. On single contact magnetos the
line should favor the L mark, if possible.
d. If the distributor block was removed from the housing, the distributor gear alignment and internal check
may be accomplished as followed:
1. Turn rotating magnet in direction of rotation until it is located in
firing position (keyway up and points
just opening). Tighten adjusting knob
of 11-8465 Rotor Holding Tool Apply
a light coating of Bendix Grease P/N
10-27165 to teeth of distributor gear,
if needed. The large distributor gear
incorporates four timing makrs, Land
LB for left hand rotation and R and RB
Marks
Timing
Figure 8A-13. Aligning
for right hand rotation.
2. With distributor gear assembled to block, turn gear until raised rib on
block lines up between the L and LB marks. Assemble block and gear into housing, meshing the distributor gears together. The rib should favor the L mark,
if possible, (Refer to Figure 8A-13.)
3. Secure distributor block to housing with studs and washers. Tighten
studs finger tight. Loosen the 11-8465 Rotor HoldingTool and turn rotating magnet in reverse direction of rotation until timing light indicates contact assembly
had just opened and check to make certain timing marks align within tolerance
indicated above. Tighten block securing studs, first to 4-8 inch pounds torque
and then final torque to 20 inch pounds.
4. Insert the tip of your small finger through timing hole in housing and
against large distributor gear teeth. Rockdistributor gear back and forth slightly.
There must be perceptible backlash between teeth of large and small gears. This
check should be made at three different points, 120° apart on gear. If backlash
is not evident, replace large distributor gear.
5. Install the breaker cover and complete reassembly of the magneto. Refer to the manufacturer's publications for complete disassembly and reassembly
procedures.
e. On the magneto employing the impulse coupling, check clearance between
each flyweight and each stop pin as follows:
1. Bend the end of a stiff piece of wire into a right angle 1/8 inch long (maximum).
2. Hold magneto as shown in Figure 8A-14. Pull heel of flyweight outward

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with the hooked wire and make certain

that feeler gauge of 0.010 inch minimum thickness will pass between stop
pin and the highestpoint of the flyweight.

A626

0.10

A

NOTE

A true and accurate check
of the clearance between
flyweight and stop pin.can
only be obtained by pulling
the flyweight outward as
described above. Do not
attempt the check by pushing in on flyweight at point
"A"

f. Install and time magneto, removed from engine, in accordance with
paragraph8A-32.
g. Secure external switch leads to
Connect
the breaker cover terminals.
harness assembly to the magneto.

Figure 8A-14.Checking Flyweight
Clearance of Impulse Coupling

8A-32. INSTALLATION AND TIMING PROCEDURE. (Timing Magneto to Engine.) Although only the left magneto is equipped with an impulse coupling, the
timing procedure, in the following paragraphs, is the same for both magnetos.
a. Remove the spark plug from No. 1cylinder and place a thumb over the
spark plug hole. Rotate the crankshaft in direction of normal rotation until the
compression stroke is reached, this is indicated by a positive pressure inside
the cylinder tending to push the thumb off the spark plug hole. Continue rotating
the crankshaft in direction of normal rotation until the advance timing mark (20)
on the front face of the starter ring gear is in exactalignment with the small hole
located at the two o'clock position on the front face of the starter housing. (Refer
to Figure 8A-15.)

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228

Refer to the latest revision
of Lycoming Service

NOTE

Bulletin No. 380

The advance timingmarkon
the top face of the starter
ring gear is marked at both
20 ° and 25 BTC. Use only
the 20 ° BTC mark when tim ingthe magnetos to the engine.
NOTE
If the crankshaft is accidently turned in the direction opposite normal rotation, repeat the above procedure
as
accumulated
backlashwill make the final
timing incorrect.

Figure 8A-15. Engine Timing Marks

b. At this point, the engine is ready for assembly of the magnetos. Remove
the inspection plugs from both magnetos and turn the drive shafts in direction of
normal rotation (counterclockwise facing the coupling), until the first painted
chamfered tooth on the distributor gear is aligned in the center of the inspection
window. (Refer to Figure 8A-16.) Being sure that the gear does not move from
this position, install gaskets and magnetos on the engine. Secure with washers
and nuts; tighten only finger tight.
NOTE
The magnetos are held in placebyclampswhichallows
them to be timed in several positions. Since all positions will not give the required clearance between
magneto and engine mount, the magnetos must be installed from the horizontal position to 20° above the
horizontal as shown in Figure 8A-16. Improper installation of magnetos could cause damage or failure.
NOTE
In order to turn the shaft on an impulse coupling magneto, depress pawl on the impulse couplingwith the finger.

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897

RED
OR
TOOTH
WHITE

TIMING
MARK

Figure 8A-17. Magneto Timing Marks

Figure 8A-16. Magneto Adjustment
Limits

c. Using a battery powered timing light, attach the positive lead to a suitable
terminal connected to the ground terminal of the magneto and the negative lead to
any unpainted portion of the engine. Rotate the magneto in its mounting flange to
a point where the light comes on, then slowly turn it in the opposite direction until the light goes out. Bring the magneto back slowly until the light just comes
on. Repeat this with the second magneto.
NOTE
AC timinglights operate in the reverse manner as described above, the light goes out when the breaker
points open.
d, After both magnetos have been timed, check, as described below, to ascertain that both magnetos are set to fire together.
e. Backoff the crankshaft a few degrees, the timinglights shouldgo out. Bring
the crankshaft slowly back in direction of normal rotation until the timing mark
and the hole in the starter housing are in alignment. At this point, both lights
should go on simultaneously. Tighten nuts to specified torque.
f . After magnetos have been properly timed, replace breaker cover and secure.
g. Install the ground lead and the retard spark lead on the left magneto.
h. Place the harness terminal plate on the magneto and tighten nut around the
plate alternately to seat cover squarely on magneto. Torque nuts to 18 to 22 inch
pounds.

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8A-33. HARNESS ASSEMBLY.
8A-34. INSPECTION OF HARNESS.
a. Check lead assemblies for nicks, cuts, mutilated braiding, badlyworn section or any other evidence of physical damage. Inspect spark plug sleeves for
chafing or tears and damaged or stripped threads on coupling nuts. Check compression spring to see if it is broken or distorted. Inspect grommet for tears.
Check all mounting brackets and clamps to see that they are secure and not cracked.
b. Using an ohmmeter, buzzer, or other suitable low voltage device, check
each lead for continuity. If continuity does not exist, wire is broken and must be
replaced.
c. For electrical test of harness assembly, use a high voltage, directcurrent
tester such as the TAKK Model 86 or 86A or an equivalent direct current high
voltage tester capable of delivering a test potential of 10, 000 volts. Connect
ground lead to high voltage tester to outer shielding braid of a single lead. Connect plug terminal. Turn tester "ON" and apply 10, 000 volts. The insulation
resistance should be 100 megohms minimum. Proceed to check other leads of
harness in same manner.
d. Minor repair of the harness assembly, such as replacement of contact
springs, spring retainer assemblies, insulating sleeves or of one lead assembly,
can be accomplished with the harness assembly mounted on the engine. However,
should repair require replacement of more than one lead assembly or of a cable
outlet plate, the harness should be removed from the engine and sent to anoverhaul shop.
8A-35. REMOVAL OF HARNESS.
a. Disconnect the clamps that secure the wires to the engine and accessories.
b. Loosen the coupling nuts at the sparkplugs andremove the insulators from
the spark plug barrel well. Use caution when withdrawing the insulator not to
damage the insulator spring.
c. Place a guard over the harness insulators.
d. Remove the harness assembly terminal plate from the magneto.
e. Remove the harness from the airplane.
8A-36. MAINTENANCE OF HARNESS.
a. To replace contact springs, spring retainer assemblies or insulating sleeves,
proceed as follows:
1. Using a Scintilla 11-7073 Needle or a mechanical pencil with the lead
retracted, hook the end of the contact spring as shown in Figure 8A-18.

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2. Using the needle or pencil,
unscrew the spring.
3. Slide insulating sleeve and
spring retainer assembly off end of lead
assembly.
4. Replace defective component
and reassemble as follows:
(a) Fabricate a tool as shown
in Figure 8A-19 for installing the insulating sleeves
over cable terminals.
(b) Push the tool thru insulating sleeve and spring retainer assembly as shown
in Figure 8A-20. Screw
the cable terminal into the
tool.

230

Figure 8A-18. Removing Spring
From Lead Assembly

(c) Work insulating sleeve and spring retainer assembly into position
over the cable and unscrew the tool. Install contact spring on cable
terminal.
NOTE
It may be necessary to lubricate cable and insulating
sleeve with a thin film of MC 200 (200, 000 centistokes)
or commercial grade alcohol to facilitate assembly.
C 346

DRILL NO. 47 1/4 IN. DEEP
TAP 3-48

BRAZE
2-1/2 IN.

BLEND O.D. TO I.D.

POLISHO.D.
12.000 IN.

MAT: NO. 30 DRILL RODOR EQUIVALENT

Figure 8A-19. Assembly Tool

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C346

SPRING RETAINER ASSY

SLEEVE

TOOL

CABLE

Figure 8A-20. Using Assembly Tool
C346

REQUIRED LENGTH

Figure 8A-21. Measuring Lead Assembly Length
b.

To replace one of the lead assemblies proceed as follows:
1. Remove clamps and brackets from applicable lead assembly. Cut cable
ties from assembly and discard.
2. Cut off condemned lead flush with outer surface of cable outlet plate.
3. Grip eyelet of lead with a pair of pliers and pull short length of conductor out of grommet and cable outlet plate.
4. Using a 3 inch long, 0.270 inch diameter drift, applied atouter surface
of plate, drive out tapered ferrule and remaining pieces of insulation and shielding.
5. To determine what length the new lead assembly should be cut to, proceed as follows:
(a) Measure the length of the condemned lead assembly. Move coupling
nut back on lead assembly and measure from outer end of ferrule
at spark plug end. (Refer to Figure 8A-21.)
(b) To the length determined in step (a), add 1-3/4 inches.

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231

231

Figure 8A-22. Cutting Metallic
Braid From End of Lead

Figure 8A-23. Unbraiding Metallic
Shielding
NOTE

Spare part leads are supplied in various length. Use
a lead which is longer than, but nearest to, the desired length.
6. Cut lead assembly to the length determined in step 5. Mark ferrule on
spark plug end of lead with a metal stamp, scribe or rubber stamp to correspond
with correct cylinder number.
7. Starting at spark plug location, thread new cable thru grommets and
clamps as necessary for correct routing of cut end of cable to magneto location.
8. Using electrician's scissors, carefully remove 1.250 inch of outer braid
from end of lead. (Refer to Figure 8A-22.)
CAUTION
Use care not to nick or cut insulation when removing
braid.
9. Using a scribe or similar pointed tool, unbraid 3/8 inch of braided
shielding. (Refer to Figure 8A-23.) Wrap a single thickness of electrical tape
around unbraided strands to facilitate insertionof lead end thru hole in cable outlet plate.
10. Remove cable outlet plate from magneto. Support plate securely and,
using suitable cutting pliers, split and remove eyelets from leads adjacent to lead
being replaced. When splitting eyelet make certain that wire strands are not cut.
Removal of eyelets on adjacent leads will allow grommet to be pulled away from
outlet plate to facilitate insertion of new lead.

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C347

UNBRAIDED
SHIELDING

POSITIONOF
FERRULEUNDER
SHIELDING

RED COATING

-

3/8"

Figure 8A-24. Forming Shielding Around Ferrule
11. Pass the taped end of new lead through hole in outlet plate. Remove
electrical tape from lead and install tapered end of ferrule under the unbraided
strands of shielding. Form strands of shielding evenly
as shown in Figure '8A-24 and pull lead assembly back through cable outlet plate
until ferrule binds in the outlet well. Position the Scintilla 11-7074 Ferrule Seating Tool (Figure 8A-25) over the wire and firmly seat the ferrule by tapping the
seating tool with a hammer or by using an arbor press.
12. Measure 1/2 inch from tapered ferrule and strip remaining insulation
from wire. (Refer to Figure 8A-27.)
13. Insert Scintilla 11-7073 Needle (Figure 8A-26) thru small hole grommet and over stripped end of wire. (Refer to Figure 8A-28.) Slide grommet down
needle until it seats tightly against the tapered ferrule.
C347

C347

2.750
2.031
2.375
0.095 DIA

0.370

0.047 SPHERICAL
RAD
2 PLACES

0.047 DIA

MATERIAL-BRASS

Figure 8A-25. Ferrule Seating Tool

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Figure 8A-26. Needle

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232

1-7073 NEEDLE

Figure 8A-27. Measuring Wire From
Top of Ferrule

232

0.50

Figure 8A-28. Installing Grommet
Over Lead Assemblies

14. Cut wire 3/8 inch from top of grommet outlet (Refer to Figure 8A-28).
Double wire over as shown in A of Figure 8A-30. Slide eyelet over doubled wire
until it is firmly seated in recess of grommet outlet.
15. Using the "AB" groove of Scintilla 11-4152 Crimping Tool, or equivalent, crimp eyelet to wire. Approximately 1/32 of an inch of wire should extend
from end of eyelet after crimping. (Refer to B of Figure 8A-30.)
233

233

A

Figure 8A-29. Lead Assembl
Assembly
Installed in Grommet

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3B20

Figure 8A-30. Wire Doubled Over
For Installation of Eyelet

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NOTE
If the crimping tool is not available, a satisfactory
connection can be made by soldering with Kester Flux
709 or equivalent and a non-corrosive solder. After
soldering, clean solder joints using denatured alcohol.
16. Install clamps and calbe ties as necessary to secure lead to the engine.
8A-37. INSTALLATION OF HARNESS. Before installing harness on magneto,
check mating surfaces for cleanliness. Spray entire face of grommet with a light
coat of Plastic Mold Spray, SM-O-O-TH Silicone Spray or equivalent. This will
prevent harness grommet from sticking to magneto distributor block.
a. Placetheharness
terminal plate on the magneto and tighten nuts around the
plate alternately to seat cover squarely on magneto. Torque nuts to 18 to 22 inch
pounds.
b. Route ignition wires to their respective cylinders.
c. Clamp the harness assembly in position.
d. Connect the leads to the spark plugs.
8A-38.

SPARK PLUGS.

8A-39. REMOVAL OF SPARK PLUGS.
a. Loosen the coupling nut on the harness lead and remove the terminal insulator from the spark plug barrel well.
NOTE
When withdrawing the ignition cable lead connection
from the plug, care must be taken to pull the lead
straight out and in line with the center line of the plug
barrel; otherwise a side load will be applied, which
frequently results in damage to the barrel insulator
and connector. If the lead cannot be removed easily
in this manner, the resistingcontact between the neoprene collar and the barrel insulator will be broken
by a rotary twisting of the collar. Avoid undue distortion of the collar and possible side loading of the
barrel insulator.

Reissued: 1/15/81

3B21

POWER PLANT

PIPER CHEROKEE SERVICE MANUAL

b. Remove the spark plug from the engine. In the course of engine operation,
carbon and other combustion products will be deposited on the end of the spark
plug and will penetrate the lower threads to some degree. As a result, greater
torque is frequently required for removing a plug than for its installation. Accordingly, the torque limitations given do not apply to plug removal and sufficient
torque must be used to unscrew the plug. The higher torque in removal is not as
detrimental as in installation, since it cannot stretch the threaded section. It
does, however, impose a shearing load on this section and may, if sufficiently
severe, produce a failure in this location.
NOTE
Torque indicating handle should not be used for spark
plug removal because of the greater torque requirement.
c. Place spark plugs in a tray that will identify their position in the engine as
soon as they are removed.
NOTE
Spark plugs should not be used if they have been dropped.
d. Removalof seized spark plugs in
the cylinder may be accomplished by
application of liquid carbon dioxide by
a Conical metal funnel adapter with a
hole at the apex just large enough to
accommodate the funnel of a CO2 bottle.
(Refer to Figure 8A-31.) When a seized
sparkplug cannot be removed by normal
means, the funnel adapter is placed over
and around the spark plug. Place the
funnel of the CO2 bottle inside the funnel
adapter and release the carbon dioxide
to chill and contract the spark plug.
Break the sparkplug loose witha wrench.
A warm cylinder head at the time the
carbon dioxide is appliedwill aidin the
removal of an excessively seized plug.
e. Do not allow foreign objects to
enter the spark plug hole.

Reissued: 1/15/81

234

Figure 8A-31. Removing Spark Plug
Frozen to Bushing

3B22

POWER PLANT

PIPER CHEROKEE SERVICE MANUAL

8A-40.. INSPECTION AND CLEANING OF SPARK PLUG.
a. Visually inspect each spark plug for the following non-repairable defects:
1. Severely damaged shellor shield threads nicked up, stripped or crossthreaded.
2. Badly battered or rounded shell hexagons.
3. Out-of-round or damaged shielding barrel.
4. Chipped, cracked or broken ceramic insulator protions.
5. Badly eroded electrodes worn to approximately 50% of original size.
b. Clean the spark plug as required, removing carbon and foreign deposits.
c. Set the electrode gap at .015 to .018 inches.
d. Test the spark plug both electrically and for resistance.
8A-41. INSTALLATION OF SPARK PLUGS. Before installing spark plugs, ascertain that the threads within the cylinder are clean and not damaged.
a. Apply anti-seize compound sparingly on the threads and install gasket and
spark plugs. Torque 360 to 420 inch pounds.
CAUTION
Make certain the deep socket is properly seated on the
spark plug hexagon as damage to the plug could result
if the wrench is cocked to one side when pressure is
applied.
b. Carefully insert the terminal insulator
coupling unit.

in the spark plug and tighten the

8A-42. LUBRICATION SYSTEM.

8A-43. OIL PRESSURE RELIEF VALVE.
The function of the oil pressure relief valve, which is located between the
upper right engine mounting lug and No. 3 cylinder, is to maintain engine oil
pressure within specified limits by withdrawing a portion of the oil from the circulating system and returning the oil to the sump should the pressure become
excessive. This valve is not adjustable; however, particles of metal or other
foreign matter lodged between ball and seat will result in a drop in oil pressure.
It it advisable, therefore, to disassemble, inspect and clean the relief valve if
excessive pressure fluctuations are noted.
The oil pressure relief valve is by no means to be confused with the oil

Reissued: 1/15/81

3B23

POWER PLANT

PIPER CHEROKEE SERVICE MANUAL

cooler by-pass which is located on the oil pressure screen housing mounting pad. The sole
purpose of the by-pass valve is to serve as a safety measure, permitting pressure oil to by-pass
the oil cooler entirely in case of an obstruction within the cooler.
8A-44. SWITCHING.
8A-45. REMOVING IGNITION SWITCH.
a. Insure the ignition switch is in the OFF position.
b. Gain access to and disconnect the power lead (+) from the battery.
c. Remove the ignition switch retaining nut from the switch on the forward side of the
instrument panel and withdraw the switch from the panel.
d. Mark the wires and note their position on the switch, then disconnect the wires.
8A-46. INSTALLATION OF IGNITION SWITCH. (Refer to Figure 8A-32.)
a. Attach wires to the switch as shown in Figure 8A-32.
b. Position the ignition switch in the instrument panel and secure with retaining nut.
c. Connect the power lead (+) to the battery and reinstall any access covers previously
removed.
.C236

J1A
TAB
K1A

GND

J2A

BAT

PR

K1B

PA-28R-180,S/N 28R-30005TO 28-7130019
PA-28R-200,S/N 28R-30482,28R-35001 TO 28R-7435331

Figure 8A-32. Ignition Switch Wiring Positions

Revised: 8/3/81

3B24

POWER PLANT

PIPER CHEROKEE SERVICE MANUAL

TABLE VIIIA-I.
Trouble
Failure of engine to
start.

Reissued: 1/15/81

ENGINE TROUBLESHOOTING
Cause

Remedy

Lack of fuel.

Check fuel system for
leaks. Fill fuel tank.
Clean dirty lines, strainers or fuel valves.
Check fuel selectorvalve
for proper tank.
Check fuel pressure with
electric boost pump ON.
Check mixture control
knob for full rich.

Overpriming.

Open throttle and "unload"
engine by engaging
starter. Mixture in
idle-cut-off.

Incorrect throttle
setting.

Open throttle to oneeight of its range.

Defective spark plugs.

Clean and adjust or replace spark plugs.

Defective ignition wire.

Check with electric tester and replace defective
wires.

Defective battery.

Replace with charged
battery.

Improper operation of
magneto breaker.

Clean points. Check internal timing of magnetos.

Lack of sufficient fuel
flow.

Disconnect fuel line at
fuel injector and check
fuel flow.

3C1

POWER PLANT

PIPER CHEROKEE SERVICE MANUAL

TABLE VIIIA-I. ENGINE TROUBLESHOOTING
Trouble

Cause

(cont.)
Remedy

Failure of engine to
start. (cont.)

Internal failure.

Check oil screens for
metal particles.
If
found, complete overhaul of engine may be
indicated.

Failure of engine to
idle properly.

Incorrect idle mixture.

Adjust mixture.

Leak in the induction
system.

Tighten all connections
in the induction system. Replace any parts
that are defective.

Incorrect idle adjustment.

Adjust throttle stop to
obtain correct idle.

Uneven cylinder compression.

Check condition of piston rings and valve
seats.

Faulty ingition system.

Check entire ignition
system.

Insufficient fuel pressure.

Adjust fuel pressure.

Mixture too rich; indicated by sluggish engine operation, red exhaust flame at night.
Extreme cases indicated by black smoke
from exhaust.

Readjustment of fuel injector by authorized
personnel is indicated.

Low power and uneven

Reissued:1/15/81

3C2

POWER PLANT

PIPER CHEROKEE SERVICE MANUAL

TABLE VIIIA-I. ENGINE TROUBLESHOOTING

(cont.)

Trouble

Cause

Remedy

Low power and uneven
running. (cont.)

Mixture too lean; indicated by overheating
or backfiring.

Check fuel lines for
dirt or other restrictions. Check fuel injection nozzles.

Leaks in induction
system.

Tighten all connections.
Replace defective
parts.

Defective spark plugs.

Clean and gap or replace spark plugs.

Improper fuel.

Fill tank with fuel of
recommended grade.

Magneto breaker points
not working properly.

Clean points. Check
internal timing of magnetos.

Defective ignition wire.

Check wire with electric
tester.
Replace defective wire.

Defective spark plug
terminal connectors.

Replace connectors on
spark plug wire.

Leak in the induction
system.

Tighten all connections
and replace defective
parts.

Throttle lever out of
adjustment.

Adjust throttle lever.

Improper fuel flow.

Check strainer, gauge
and flow at fuel injector inlet.

Failure of engine to
develop full power.

Reissued: 1/15/81

3C3

POWER PLANT

PIPER CHEROKEE SERVICE MANUAL

TABLE VIIIA-I. ENGINE TROUBLESHOOTING
Trouble
Failure of engine to
develop full power.
(cont.)

Rough engine.

Low oil pressure.

Reissued:1/15/81

Cause
Restriction

in air scoop.

(cont.)
Remedy

Examine air scoop and
remove restrictions.

Improper fuel.

Drain and refill tank
with recommended
fuel.

Faulty ignition.

Tighten all connections.
Check system with
tester.
Check ignition
timing.

Cracked engine mount.

Replace or repair
mount.

Defective mounting
bushings.

Install new mounting
bushings.

Uneven compression.

Check compression.

Insufficient oil.

Fill sump with recommended oil.

Air lock or dirt in relief valve.

Remove and clean oil
pressure relief valve.

Leak in suction line or
pressure line.

Check gasket between
accessory housing and
crankcase.

Dirty oil strainers.

Remove and clean oil
strainers.

Defective pressure
gauge.

Replace gauge.

3C4

POWER PLANT

PIPER CHEROKEE SERVICE MANUAL

TABLE VIIIA-I.
Trouble
Low oil pressure.
(cont. )

High oil temperature.

Excessive oil consumption.

Reissued: 1/15/81

ENGINE TROUBLESHOOTING
Cause

(cont.)
Remedy

Stoppage in oil pump
intake passage.

Check line for obstruction. Clean suction
strainer.

High oil temperature.

See "High Oil Temperature" in "Trouble"
column.

Insufficient air cooling.

Check air inlet and outlet for deformation or
obstruction.

Insufficient oil supply.

Fill oil sump to proper
level with specified oil.

Low grade of oil.

Replace with oil conforming to specifications.

Clogged oil lines or
strainers.

Remove and clean oil
strainers.

Excessive blow-by.

Usually caused by worn
or stuck rings.

Failing or failed
bearing.

Examine sump for
metal particles.
If
found, overhaul of engine is indicated.

Defective temperature
gauge.

Replace gauge.

Low grade of oil.

Fill tank with oil conforming to specifications.

3C5

POWER PLANT

PIPER CHEROKEE SERVICE MANUAL

TABLE VIIIA-I. ENGINE TROUBLESHOOTING
Trouble
Excessive oil consumption. (cont.)

Reissued: 1/15/81

Cause

(cont.)

Remedy

Failing or failed bearings.

Check sump for metal
particles.

Worn piston rings.

Install new rings.

Incorrect installation of
piston rings.

Install new rings.

Failure of rings to seat
(new nitrided cylinders. )

Use mineral base oil.
Climb to cruise altitude at full power and
operate at 75% cruise
power setting with high
oil temperature until
oil consumption stabilizes.

3C6

POWER PLANT

3C7
INTENTIONALLYLEFT BLANK

SECTION IX
FUEL SYSTEM
Paragraph
9-1.
9-2.
9-3.
9-4.

9-8.
9-10.
9-12.

9-17.

9-24.

9-30.

Aerofiche
Grid No.

Introduction .................................................
Description ..................................................
Troubleshooting ..............................................
Main Fuel Tanks (PA-28-140, -150, -160, -180, -235
and PA-28R) ............................................
9-5.
Removal of Main Fuel Tanks ..................
......
9-6.
Inspection and Repair of Main Fuel Tank ..............
9-7.
Installation of Main Fuel Tank ........................
Tip Fuel Tanks (PA-28-235) ...................................
9-9.
Removal of Tip Tank .............................
...
Fuel Tank Repair (Fiberglas) ................
..................
9-11.
Installation of Tip Tank .........................
... ..
Fuel Quantity Transmitter Unit ................................
9-13.
Removal of Fuel Quantity Transmitter Unit .............
9-14.
Installation of Fuel Quantity Transmitter Unit ..........
9-15.
Fuel Quantity Transmitter/Gauge Check ...............
Check and Adjustment of Fuel Quantity
9-16.
Transmitter Unit ................................
Fuel Valves ..................................................
9-18.
Fuel Shutoff Valve (PA-28-140, -150, -160,
-180, and PA-28R) ...............................
9-19.
Removal of Fuel Shutoff Valve ........................
9-20.
Disassembly of Fuel Shutoff Valve .....................
9-21.
Cleaning, Inspection and Repair of Fuel
Shutoff Valve...................................
9-22.
Assembly of Fuel Shutoff Valve .......................
9-23.
Installation of Shutoff Valve ..........................
Fuel Selector Valve and Filter (PA-28-235) ..........
............
9-25.
Fuel Selector Valve Operation.........................
9-26.
Removal of Fuel Selector Valve and Filter ..............
Port Repair of 1H26-4 Fuel Selector ...................
9-27..
9-28.
Cleaning Filter Assembly .............................
Installation of Fuel Selector and Filter Valve............
9-29.
Fuel Filter Bowl and Screen (PA-28-140, -150, -160,
-180, and PA-28R)
.......................
Removal of Fuel Filter Bowl and Housing ..............
9-31.
Installation of Fuel Filter Bowl and Screen .............
9-32.
Cleaning and Inspection of Filter Bowl Screens..........
9-33.

Reissued: 1/15/81

3C8

3C10
3C10
3C17
3C17
3C17
3C17
3C18
3C18
3C18
3C18
3C19
3C19
3C19
3C19
3C19
3C20
3C22
3C22.
3C22
3C22
3C22
3C23
3C23
3C23
3C23
3C23
3C24
3D1
3D2
3D3
3D3
3D3
3D4

PIPER CHEROKEE SERVICE MANUAL

Aerofiche
Grid No.

Paragraph
9-34.
9-35.

9-44.

9-50.

9-54.
9-55.

Electric Fuel Pumps ..........................................
Plunger Fuel Pumps (PA-28-140,-150, -160, -180, and -235) .......
Removal of Fuel Pumps ..............................
9-36.
9-37.
Disassembly of Fuel Pump ...........................
9-38.
Cleaning, Inspection and Repair of Fuel Pump ..........
Resistance Check (Plunger Type Pump) ................
9-39.
9-40.
Assembly of Fuel Pump ..............................
9-41.
Adjustment of Electric Fuel Pump (Bench Test) .........
Adjustment of Electric Fuel Pump (In Airplane).........
9-42.
9-43.
Installation of Fuel Pumps ............................
Rotary Fuel Pumps (Weldon) (PA-28R) ..
..................
Removal of Fuel Pump ..............................
9-45.
9-46.
Disassembly, Repair and Assembly of Fuel Pump .......
9-47.
Adjustment of Electric Fuel Pump (Bench Test) .........
9-48.
Adjustment of Electric Fuel Pump (In Airplane) .........
9-49.
Installation of Fuel Pump ............................
Engine Primer Pump ........................................
9-51.
Removal of Engine Primer .........
.................
9-52.
Disassembly, Cleaning and Assembly of Engine
Primer .........................................
9-53.
Installation of Engine Primer Pump ....................
Primer Jets ..................................................
Cleaning Fuel System .........................................

Reissued: 1/15/81

3C9

3D4
3D4
3D4
3D5
3D7
3D7
3D7
3D8
3D8
3D9
3D10
3D10
3D10
3D11
3D 11
3D12
3D12
3D 12
3D 12
3D13
3D13
3D13

PIPER CHEROKEE SERVICE MANUAL

SECTIONIX
FUEL SYSTEM
9-1. INTRODUCTION. The fuel system components covered in this section consist of the
fuel tanks, selector valves, filter screens and fuel pumps. Instructions are given for
remedying difficulties which may arise in the normal operation of the fuel system. The
instructions are organized so the mechanic can refer to: Removal, Repair, Installation and
Adjustment of each part of the system.
Maintenance for carburetion and fuel injection may be found under Power Plant,
Section VIII or VIIIA.
9-2. DESCRIPTION. The PA-28-140,-150, -160, -180 and PA-28R airplanes are equipped
with aluminum fuel tanks consisting of one in the inboard leading edgesection of each wing.
Each tank has a capacity of 25 gallons. A strainer is installed in the fuel outlet of each tank.
From the tank outlet a fuel line is routed through the wings to the fuel selector valve located
on the left side of the cabin in front of the pilot's seat; from the fuel selector valve a line leads
to the fuel strainer bowl mounted on the left forward face of the fire wall. A fuel line is routed
from the strainer bowl to the electric fuel pump, engine driven fuel pump and then to the
carburetor injector inlet port.
Two electrical fuel quantity gauges are mounted within the instrument cluster. Each
gaugeis connected to a transmitter unit installed in the fuel tanks.
On the PA-28-235 the fuel tanks consist of one aluminum tank located in the inboard
leading edge section of each wing plus fiberglas tanks located in each wing tip. The main
tanks have a maximum capacity of 25 gallonseach while the tip tanks hold 17 gallonseach.
A strainer is installed in the fuel outlet of each tank. From the tank outlet a fuel line is
routed through the wings to a fuel selector and strainer valve located under the rear seat.
The fuel selector valve is controlled remotely by a selector mechanism located on the
sloping face of the control tunnel. The strainer portion of the valve is operated by a lever
located on the lower right front of the rear seat. From the selector valve, fuel is drawn
through the electric fuel pump(s) located in the area under the rear seat, through the engine
driven pump and onto the carburetor.
Four electrical fuel quantity gauges are mounted within the instrument cluster. Each
gauge is connected to a transmitter unit installed in the fuel tanks.

Reissued: 1/15/81

3C10

FUEL SYSTEM

PIPER CHEROKEE SERVICE MANUAL

1787

FUEL
QUANTITY
GAUGES
FUEL
VALVE
TANK
SELECTOR

FUELTANK
SELECTOR
VALVE
FUEL
STRAINER
RIGHT
MAINTANK

LEFT
MAINTANK
PRIMER
-ENGINE
FUEL
PUMP

FUEL
PRESSURE
GAUGE

ELECTRIC
FUEL
PUMP

CARBURETOR

Figure 9-1. Fuel System Diagram (PA-28-140,-150, -160, -180)

Reissued: 1/15/81

3C11

FUEL SYSTEM

PIPER CHEROKEE SERVICE MANUAL

1780

CARBURETOR

THROTTLE
MIXTURE
CONTROL
SELECTOR
FUEL

PUMP
FUEL
ENGINE

LEFT
TIPTANK

TANK
MAIN
RIGHT

TANK
MAIN
LEFT

TIPTANK
RIGHT

PUMPS
FUEL

GAUGES
QUANTITY
FUEL

Figure 9-2. Fuel System Diagram
(PA-28-235, Serial Nos. 28-10003 to 28-10719 incl.)
Reissued: 1/15/81

3C12

FUEL SYSTEM

PIPER CHEROKEE SERVICE MA NUAL

1771

CARBURETOR

CONTROL
SELECTOR
FUEL

ENGINE

LEFT
TIPTANK

LEFT
MAIN
TANK

RIGHT
MAIN
TANK

RIGHT
TIPTANK

ELECTRIC
FUEL
PUMP

FUEL
QUANTITY
GAUGES

Figure 9-3. Fuel System Diagram
(PA-28-235, Serial Nos. 28-10720 and up)

Reissued: 1/15/81

3C13

FUEL SYSTEM

PIPER CHEROKEE SERVICE MANUAL

C350

FUELQUANTITY FUEL
QUANTITY
PRESSURE FUEL
GAUGE
GAUGE
GAUGE

RIGHT
TANK

FUEL
SELECTOR

LEFT
TANK

U
DRAIN

U

DRAIN

GASCOLATOR
FLOW
FUEL
GAUGE

VENT

ELECTRIC
FUEL
PUMP

ENGINE
DRIVEN
FUELPUMP

FUELINJECTOR

FLOW

Figure 9-4. Fuel System Diagram(PA-28R)

Reissued: 1/15/81

3C14

FUEL SYSTEM

3C15
INTENTIONALLYLEFT BLANK

3C16
INTENTIONALLY LEFT BLANK

PIPER CHEROKEE SERVICE MANUAL

9-3. TROUBLESHOOTING.Troubles peculiar to the PA-28 fuel system are listed in Table
IX-III along with their probable causes and suggested remedies. When troubleshooting,
check from the power supply to the items affected. If no trouble is found by this method,
the trouble probably exists inside individual pieces of equipment; they may then be
removed from the airplane and an identical unit or units, tested and known to be good,
installed in their place.
9-4. MAIN FUEL TANKS. (PA-28-140,-150, -160, -180, -235 and PA-28R.)
9-5. REMOVALOF MAINFUEL TANKS.
a. Drain the fuel from the fuel tank. (Refer to DrainingFuel System, Section II.)
b. Remove the screwsfrom around the perimeter of the tank assembly.
c. Disconnect fuel line attached to tank.
d. Pull the tank away from the wing assemblyfar enough to gain accessfor removal of
the sender wire.
e. The tank is now free to be removed.
9-6. INSPECTIONAND REPAIR OF MAINFUEL TANK. The entire interior of the main
tanks should be inspected for peeling of small areas of the sloshingcompound. Indications
are that in the majority of cases the peeling is started just inside the filler neck as a result of
the metal nozzle of the gas filler hose nicking the compound. The following items are
recommended:
a. The entire interior of the main tanks should be inspected with the tanks drained.
This is accomplishedwith a mirror and inspection light through the filler neck. Small scrapes
in the film adjacent to the filler neck may be disregardedprovided there is no indication of
peeling.
b. If peeling has occurred and separated material is found, the main tank should be
removed and resloshed in accordance with the instructions included with each can of
Randolph Sloshing Sealer 802, Piper part number 757 572v. (Approved under Mil. Spec.
MIL-L-6047B.) One gallon of sloshing compound is required per tank. After sloshing the
tank, apply 1.5 lbs. air pressure and using a soap and water solution, check for leaks.
c. After resloshing, reinspect as above at intervals of 100 hours. These inspections may
be discontinued after the second inspection if no peeling is discovered.

Reissued: 1/15/81

3C17

FUEL SYSTEM

PIPER CHEROKEE SERVICE MANUAL

NOTE
The fuel tank should be replaced if the tank is damaged to
the extent it cannot be repaired by the above method.
9-7. INSTALLATIONOF MAIN FUEL TANK.
a. Slide the main tank partly into position and connect the sender wire.
b. Slide the tank completely into place and secure with screwsaround its perimeter.
c. Connect fuel line on inboard side of tank. The flexible hose from the fuel tank must
not be twisted during installation on applicable models.
d. Fill the fuel tank and check for leaks, unrestricted fuel flow and proper sender
indications on the quantity gauge.
9-8. TIP FUEL TANKS(PA-28-235).
9-9. REMOVALOF TIP TANK.
a. Drain the fuel from the tank to be removed. (Refer to Draining Fuel System,
Section II.)
b. Remove the accesscover from the bottom of the wing tip.
c. By working through the access, disconnect the fuel line, fuel quantity transmitting
wire and position light wire. Remove the two nuts, washers and bolts which hold the tank to
the wing.
d. Carefully remove the screws from around the wing tip and remove the tip assembly.
9-10. FUEL TANK REPAIR. (Fiberglas). The wing tip tanks are constructed of fiberglas.
Minor repair of the tank can be accomplished with the use of Fiberglas Repair Kit No.
756 729. This kit along with instructions is obtained from Piper Dealers or Distributors.
Additional fiberglasrepairs may be found in Section IV of the Manual.

Reissued: 1/15/81

3C18

FUEL SYSTEM

PIPER CHEROKEE SERVICE MANUAL

9-11. INSTALLATION OF TIP TANK.
a. Position the wing tip in place on the wing and insert the two bolts, washers and
nuts on their proper places and tighten. Replace the several screws around the tip tank and
tighten. Connect the position light leads, the fuel quantity transmitting wire and the fuel line.
b. After the wing tip is installed and all connections are secured, fill the tip tank and
check for fuel leaks, operation of the fuel gauge and position light.
c. Install the access cover to the bottom of the wing tip.
9-12. FUEL QUANTITY TRANSMITTER
9-13.
a.
b.
c.
d.

UNIT.

REMOVAL OF FUEL QUANTITY TRANSMITTER UNIT.
Remove the fuel tank. (Refer to Paragraph 9-5 or 9-9.)
Disconnect the transmitter wire from the connection post.
Cut the safety wire which secures the five attaching screws.
Remove the five screws or bolts and remove the unit.

9-14. INSTALLATION OF FUEL QUANTITY TRANSMITTER UNIT.
a. Position the transmitter and gasket to the fuel tank and secure with machine screws
or bolts and washers. Torque bolts to 25 inch pounds. (Tip tank installation, install ground
wire under head of mounting screw.)
b. Safety the machine screws with MS20995-C32 wire.
c. Install the fuel tank. (Refer to Paragraph 9-7 or 9-10.)
9-15. FUEL QUANTITY TRANSMITTER/GAUGE
CHECK. Fuel quantity transmitter unit and gauge may be checked, while installed in the airplane, by the following
procedure:
a. Turn the fuel selector valve off.
b. Completely drain the fuel tank that relates to the gauge to be checked. (Refer to
Draining Fuel System, Section II.)
c. Level the airplane longitudinally and laterally.
NOTE
The electrical system should supply 14-volts to the gauge.

Revised: 10/3/83

3C19

FUEL SYSTEM

PIPER CHEROKEE SERVICE MANUAL

TABLE IX-I.

TRANSMITTER/FUEL GAUGE TOLERANCES

MAIN TANK
Actual Fuel in
Tank (U. S. Gal)

TIP TANK
Actual Fuel in
Tank (U. S. Gal)

Gauge Reading
(U. S. Gal)

Gauge Reading
(U. S. Gal)

Full
22 to Full*
10
17 to 24
5
12 to 17
0
7 to 12
2to 6
0 to -2
*Plusone needle width

Full
20
15
10
5
0

15 to Full*
7 to 12
3 to 7
0 to-2

d. Turn the master switch on and observe the fuel quantity gauge. It should
read empty. Refer to Table IX-I for tolerances that are permitted between the
fuel gauge reading and the actual fuel in the tank.
e. Add fuel to the tank in the amount of five U. S. gallon increments until the
tank is full and observe the gauge readings.
NOTE
to adjust the float assembly to
It will bepermissible
obtain specified tolerances.
This adjustment may be
accomplished per instructions given in Paragraph 9-16.
9-16. CHECK AND ADJUSTMENT OF FUEL QUANTITY TRANSMITTER UNIT.
(Refer to Figure 9-6 or 9-7.)
a. If not previously removed, remove the transmitter unit to be checked from
the fuel tank. (Refer to Paragraph 9-13.)
b. Check and adjust the transmitter unit float position by using the following
procedure:
1. Fasten the unit to a fabricated checking jig with washers and nuts. (This
jig may be fabricated from dimensions given in Figure 9-14.)
2. Ascertain that with the float arm down against the mechanical stop on
the transmitter, the float is just touching (The float may be to .18 of aninch above
base the base of the jig. Should the float not be touching the base or the float arm
is not against the bottom stop, adjust the arm of float assembly, P/N 62037-00,
by bending it at the location as indicated in Figure 9-6 orthe arm stop of float
assembly, P/N 68101-00, by bending it where shown in Figure 9-7. (On rubber
type floats, the entire surface of the float must be horizontal with the base of jig.

Reissued: 1/15/81

3C20

FUEL SYSTEM

PIPER CHEROKEE SERVICE MANUAL

A963

I

IA

ADJUSTMENT LOCATIONS

Figure 9-7. Fuel Quantity
Transmitter (P/N 68101-00)

Figure 9-6. Fuel Quantity
Transmitter (P/N 62037-00)

TABLE IX-II. FUEL QUANTITY TRANSMITTER
CALIBRATION TOLERANCES
RESISTANCE

UNIT

POSITION

P/N 62037-00
(Metal Float)

Empty
Full

.00 to 0.5 ohms
29.6 to 31.3 ohms

P/N 68101-00
(Rubber Float)

Empty
Full

240 + 20, -0 ohms
33.5 + 0, - 4.5 ohms

c. Check the transmitter unit for correct resistance and dead spots by the
following procedure:
1. Connect an ohmmeter to the transmitter unit and move the float arm to
its bottom mechanical stop. The ohmmeter should indicate the ohms resistance
as indicated in Table IX-II.
2. Move the float arm to its upper mechanical stop and check the ohms
resistance.
3. Check for dead spots by slowly moving the float arm from the bottom
stop to the upper stop and back. Watch the ohmmeter indicator; it should steadily
move up and down the scale without fluctuation as the float arm is moved.
4. If an incorrect resistance and/or dead spots are found, the transmitter
unit should be replaced.

Reissued: 1/15/81

3C21

FUEL SYSTEM

PIPER CHEROKEE SERVICE MANUAL
9-17. FUEL VALVES.
9-18. FUEL SHUTOFF VALVE. (PA-28-140,-150, -160, -180 and PA-28R.)
9-19. REMOVALOF FUEL SHUTOFF VALVE.
a. Remove two screws holding the fuel valve placard plate and the screw holding the
fuel shutoff valve handle.
b. Remove fuel shutoff valve handle and placard plate.
c. Disconnect right and left fuel inlet lines from fuel valveassembly.
d. Disconnect fuel outlet line from fuel valve assembly.
e. Remove fuel valve assemblyby removing attaching screws.
9-20. DISASSEMBLYOF FUEL SHUTOFF VALVE. Aircraft equipped with fuel selector
valve P/N 11383-04,must be disassembled according to the latest revision of Piper Service
Bulletin No. 355. Disassembly of other fuel selector valves is not recommended.
9-21. CLEANING, INSPECTIONAND REPAIR OF FUEL SHUTOFF VALVE. Aircraft
equipped with fuel selector valve P/N 11383-04, must be cleaned, inspected, and repaired
according to the latest revision of Piper Service Bulletin No. 355. No cleaning, inspection, or
repair is recommended for other fuel selector valves.

THIS SPACEINTENTIONALLYLEFT BLANK

FUEL SYSTEM

Reissued: 1/15/81

3C22

PIPER CHEROKEE SERVICE MANUAL

9-22. ASSEMBLY OF FUEL SHUTOFF VALVE. Aircraft equipped with fuel selector
valve P/N 11383-04must be assembled according to the latest revision of Piper Service Bulletin No. 355.
9-23. INSTALLATIONOF SHUTOFFVALVE.
a. Secure the valve to the bulkhead attachment plate with attaching screws.
b. Connect the fuel lines to the valve.
c. Install the fuel valveplacard with attaching screws.
d. Install the valve control handle with attaching screw.
9-24. FUEL SELECTORVALVEAND FILTER. (PA-28-235.)
9-25. FUEL SELECTORVALVE OPERATION. When the fuel selector handle is not in a
positive selector detent position, more than one fuel port will be open at the same time. It
should be ascertained that the fuel selector is positioned in a detent, which can be easily felt
when movingthe handle through its various positions.
9-26. REMOVALOF FUEL SELECTORVALVEAND FILTER.
a. Drain fuel from tanks. (Refer to Draining Fuel System, Section II.)
b. Remove rear seats, seat belt attachments and floor panel just aft of the main spar by
removingthe floor attachment screws. Lift the panel and remove.
c. Remove plate from bottom of the fuselagewhich coversfuel selector.
d. Disconnect the fuel lines and selector linkage from valveassembly.
e. Remove the four mounting screws which hold the fuel selector in place and remove
the selector assembly.

THIS SPACEINTENTIONALLYLEFT BLANK

Reissued: 1/15/81

3C23

FUEL SYSTEM

PIPER CHEROKEE SERVICE MANUAL

EXTERNALDETENT

827

926
10

3

1H28-4VALVES ONLY

1. PLATE, QUICK DRAIN
SHAFT, QUICK DRAIN
SLEEVE
BALL, HANDLE
5. VALVE HANDLE
6. BALL
7. FILTER
8. SPECIAL "O" RING
9. SPRING
10. SNAP RING
2.
3.

4

7

Figure 9-8.

Fuel Selector and Filter (PA-28-235)

9-27. PORT REPAIR OF 1H264 FUEL SELECTOR. (Refer to Figure 9-8.) The
followinginformation is for the 1H26-4 valvesonly, and the PA-28 parts catalog should be
used to order replacement parts.
a. Remove and discard the snap ring (10), spring(9), ball (6) and "O" ring (8) from the
valveport.
b. Replace parts removedin Step a with new parts.
NOTE
Use only special "O" ring provided by service sparesand use
care not to push "O" ring into center of valvehousing.
c. Pressure check valve with 10 +5 -0 psi of air applied at outlet port. No bubbles
should be observed when valve is held with the four inlet ports pointing up and gasoline
placed in each port.
d. Rotate the fuel selector through its full cycle of tank positions to insure proper
operation.
e. Reinstall fittings with new "O" rings in each inlet port and reinstall the valve into
the airplane in accordance with Paragraph 9-29;,

R
Reissued: 1/15/81

3C24

FUEL SYSTE

PIPER CHEROKEE SERVICE MANUAL

1715

*
-

METALLIC FILTER ASSEMBLY

Figure 9-9.

1.
2.
3.
4.

FILTER
SPRING
RETAINERWASHER
BOWL

NYLONFILTER ASSEMBLY

Fuel Filter (PA-28-235)

9-28. CLEANINGFILTER ASSEMBLY.
a. Remove the accesspanel to the filter bowl on the bottom of the fuselage.
b. Remove fuel strainer bowl.
c. Remove filter disc assembly from center stem by compressing filter retainer spring
and removing filter retainer washer. (Refer to Figure 9-9.)
d. Inspect bowl gasketand replace if necessary.
e. Filter discs may be cleanedas follows:
1. Plug open ends of filter disc center with stoppers to prevent dirt from entering.
2. Wash metallic filter disc in acetone, gasoline, carbon tetrachloride,
trichlorethylene (permachor) or Bendix cleaner. Washnylon filter disc with soap and water.
CAUTION
Do not use acetone, methylethylketone, etc., to clean nylon
filter discs.
3. Remove stubborn deposits from filter disc with a soft bristle brush.
4. Rinse all traces of soap solution. Drain or blow dry and remove stoppers.
f. Replace the filter disc if damageis evident.
g. Reinstall filter disc assemblyand strainer bowl.

Revised: 10/3/83

3D1

FUEL SYSTEM

PIPER CHEROKEE SERVICE MANUAL

9-29. .INSTALLATIONOF FUEL SELECTORAND FILTER VALVE.
a. Position the valveinside the airplanejust aft of the main spar.
b. Secure the valvewith machinescrews,washers and self-lockingnuts.
c. Connect the fuel lines.
d. Rig fuel selector valve linkage to insure that selector handle engagesleft indent
position when it is against the safety stop on console cover.
e. Fill the fuel tanks and check all connections for leaks.
f. Install the rear seat.
g. Install the accessplate to the bottom of the fuselagewith attaching screws.
NOTE
When installing the fuel selector valve, it is recommended the
complete fuel system and tanks be drained and flushed to
ascertain no contamination is present. (Refer to paragraph
9-55.)

Reissued: 1/15/81

3D2

FUEL SYSTEM

PIPER CHEROKEE SERVICE MANUAL

A640

1. BODY
2. SCREEN
3. GASKET
4. STRAINER 30WL
5. BAIL WIRE
6. BAIL ASSEMBLY
7. SAFETY WIRE
8. DRAIN VALVE

Figure 9-10. Fuel Filter Bowl and Screen
(PA-28-140, -150, -160, -180 and PA-28R)
9-30. FUEL FILTER BOWL AND SCREEN. (PA-28-140,-150, -160, -180 and PA-28R.)
(Refer to Figure 9-10.)
9-31.. REMOVAL OF FUEL FILTER BOWL AND HOUSING.
a. Ascertain that the fuel shutoff is in the off position.
b. Remove the engine cowlings by releasing the cowl fasteners or the attaching screws, depending on the type installed. Be certain that all electrical leads
are disconnected prior to removal of the cowl.
c. Disconnect the fuel lines from the filter bowl housing.
d. Cut the safety wire, loosen the bail nut, move the bail wire to the side and
remove the bowl.
e. Remove the housing of the filter bowl by spreading the ends of the bail wire
allowing the housing to be lifted from the bracket.
9-32. INSTALLATION OF FUEL FILTER BOWL AND SCREEN.
a. Position the top of the filter bowl to the bracket and connect the fuel lines.
b. Spread the bail wire ends and insert them through the holes in the side of
the mounting bracket and the top of the filter bowl.
c. Position the bowl and bail wire, and tighten the bail nut.
d. Safety the bail nut and the bail wire assembly.
e. Install the engine cowling.

Reissued: 1/15/81

3D3

FUEL SYSTEM

PIPER CHEROKEE SERVICE MANUAL

9-33. CLEANING AND INSPECTION OF FILTER BOWL SCREEN.
a. Follow steps a, b and d of paragraph 9-31 for removal of the filter bowl.
b. Remove the gasket and screenfrom the filter housing.
c. Clean the screen and bowl with acetone or a suitable dry type solvent. If damaged,
replacescreen.
d. Replacethe screenfollowedby a new gasket.
e. Position the bowl and bail wire, and tighten the bail nut.
f. Safety the bail nut and the bail wire assembly.
9-34. ELECTRICFUELPUMPS.
9-35. PLUNGER FUEL PUMPS. (PA-28-140,-150, -160, -180 and -235.)
9-36. REMOVAL OF FUEL PUMPS.
a. On the PA-28-140, -150, -160, and -180, the fuel pump may be removed by the
following procedure:
1. Remove the cowlingsby releasing the cowl fasteners or the attaching screws,
depending on the type installed. Be certain all electrical leads are disconnected prior to
removal.
2. Ascertain that the fuel shutoff valveis in the off position.
3. Disconnectthe fuel pump electrical leads.
4. Disconnectthe fuel lines from the inlet and outlet sides of the pump.
5. Remove the nuts and bolts securing the pump to its mounting bracket and
remove the fuel pump.
b. On the PA-28-235, the electric fuel pump(s) may be removed by the following
procedure:
1. Ascertainthe fuel selector is in the off position.
2. Remove the fuel drain placard coverfrom the front of the rear seat by removing
the attaching screws.
3. Remove the bottom portion of the rear seat by unsnapping it across the front
and lifting the seat pullingit forward at the same time.
4. Removethe pump coverlocated in the left side of the floor opening.
5. Disconnectthe electricallead from the pump.
6. Disconnectthe inlet and oulet lines from the pump.
7. Removethe pump by removingthe pump attaching bolts.

Reissued:1/15/81

FUEL SYSTEM

3D4

PIPER CHEROKEE SERVICE MANUAL

9-37. DISASSEMBLYOF FUEL PUMP. The following procedure is given for disassembly
of the fuel pump. Repair of the pump is limited to the fuel reservoir area only, since the
electrical system is sealed. For cleaning and servicing purposes, refer to the appropriate
instructions coveringthe particular type pump being serviced:
a. Early Type Pump: (Refer to Figure 9-11.)
1. Cut the safety wire and remove the bottom cover, gasket and filter
screen from the pump.
NOTE
If the screen does not come out, use caution removing
it from the pump housing so as not to damage it.
2. Remove the three screws securing the plunger spring cup inside the
pump. Remove the cup and gasket.
3. Pull the plunger spring and plunger assembly from the pump with fingers.
CAUTION
Do not remove the buffer spring and valve from the
plunger assembly.
b.

Late Type Pump: (Refer to Figure 9-12.)
1. Cut the safety wire and remove the bottom cover, gasket, magnet and
filter screen from the pump.
NOTE
If the screen does not come out use caution removing
it from the pump housing so as not to damage it.
2. Remove the retainer spring from the plunger tube using thin nose pliers
to spread and remove the ends of the retainer from the tube.
3. Remove the washer, "O" ring seal, cup valve, plunger assembly from
the pump.

Reissued: 1/15/81

3D5

FUELSYSTEM

PIPER CHEROKEE SERVICE MANUAL

C349

7

9

. COVER
2. COVER GASKET
3. SCREW
4. SCREEN
5. CUP VALVE
6. GASKET

7.
8.
9.
10.
11.

PLUNGER VALVE
PLUNGER CUP
PLUNGER SPRING
PLUNGER
PUMP BODY

Figure 9-11. Plunger Fuel Pump (Early)
(PA-28-150,-160, -180)
C349

9

8

1.
2.
3.
4.
5.
6.

7

6

COVER
COVER GASKET
MAGNET
FILTER
RETAINER
WASHER

5

3 2

7.
8.
9.
10.
11.
12.

1

"O"
RING
CUP VALVE
SPRING
PLUNGER
PLUNGER TUBE
PUMP BODY

Figure 9-12. Plunger Fuel Pump (Late)
(PA-28-140,-150, -160, -180, -235)

Reissued: 1/15/81

3D6

FUEL SYSTEM

PIPER CHEROKEE SERVICE MANUAL

CAUTION
Do not remove the buffer spring and valve from the
plunger assembly.
Do not tamper with seal at center of mounting bracket
at side of pump as it retains the dry gas which surrounds the electric system in the upper portion of the
pump.
9-38. CLEANING, INSPECTION AND REPAIR OF FUEL PUMP.
a. Clean all parts with acetone or a suitable dry type solvent. If plunger
assembly does not come clean or there are any rough spots, polish gently with
crocus cloth.
b. Inspect the pump for the following:
1. Check the filter screen for damage or distortion.
2. Gently touch the cup valve and check for freedom of movement. Do not
disassemble.
3. Shake the plunger assembly and listen for clicks to indicate valve action.
4. On the late model pumps, check the condition of the "O" ring.
5. Check the condition of the cover gasket and plunger spring cup gasket.
c. Repair of the pump is limited to replacementof parts found defective during
inspection.

9-39. RESISTANCE CHECK (PLUNGER TYPE PUMP). To check the resistance
of the pump, connect an ohmmeter to the lead wire of the pump and the pump
body. A reading of 4.87 to 6.4 ohms for a 12-volt pump should be obtained.
9-40. ASSEMBLY OF FUEL PUMP.
a. Later Type Pump: (Refer to Figure 9-11.)
1. Insert the plunger assembly (10) in the tube with the buffer spring end
first. Check fit by slowly raising and lowering the plunger to stick. If a click
cannot be heard, the interrupter assembly is not functioning properly in which
case the pump should be replaced.
2. Install the component parts in the following order: Cup valve, "O" ring
seal, and washer. Install the retainer spring securing the components inside the
pump housing.
3. Place the cover gasket and magnet in the bottom cover with the filter
screw.

Reissued: 1/15/81

3D7

FUEL SYSTEM

PIPER CHEROKEE SERVICE MANUAL

4. Carefully guide the screen around the plunger spring cup. The screen
must fit snugly at both ends. Do not pinch or distort the screw. Draw the bottom
cover tight with a wrench and safety.
b. Early Type Pump: (Refer to Figure 9-12.)
1. Insert the plunger spring assembly (10) in the tube with the buffer spring
end first. Check fit by slowly raising and lowering the plunger in the tube. It
should move fully without any tendency to stick. If a click cannot be heard, the
interrupter assembly is not functioning properly in which case the pump should
be replaced.
2. Install the plunger spring cup gasket (use a new one) and the plunger
spring cup. Draw the screws reasonably tight, but do not over tighten them. Be
sure the cup is not cocked to prevent the plunger from binding in the tube.
3. Place the filter screen around the bottom cover magnet.
4. Carefully guide the screen around the plunger spring cup. The screen
must fit snugly at both ends. Do not pinch or distort the screen. Draw the bottom
cover tight with a wrench and safety.
9-41. ADJUSTMENT OF ELECTRIC FUEL PUMP (BENCHTEST).
a. Ascertain that the pump is sufficiently lubricated to prevent damage if run
dry for a period greater than five minutes.
b. Connect the electrical lead of one pump to a 14-volt DC power source.
c. Using a suitable container with the proper octane fuel, connect a fuel line
from a container to the inlet side of the pump.
d. Connect another line from the outlet side of the pump to a pressure gauge
and by-pass valve and back to the container.
e. Run the pump with the by-pass valve open until a steady flow of fuel is obtained. Then close the by-pass valve and check the pressure gauge for the proper
reading of 4 to 4.75 psi maximum, no flow.
f. Repeat steps b through e for the second fuel pump.
g. If the proper pressure is not obtained, the plunger spring may be replaced
or it may be necessary to replace the complete pump assembly.
9-42. ADJUSTMENT OF ELECTRIC FUEL PUMP (IN AIRPLANE).
a. With the access panel removed and the fuel selector in the OFF position,
remove the fuel line from the outlet end of the pump.
b. Connect a test line with a by-pass valve and pressure gauge to the outlet
end of the pump to be checked.
c. Place a container below the pumpto catch any fuel from the test line during
the adjustment of the pump.

Reissued: 1/15/81

3D8

FUEL SYSTEM

PIPER CHEROKEE SERVICE MANUAL

d. Disconnect the electrical lead to the pump that is not being checked.
e. Turn the fuel selector on, open the by-pass valve on the test line and start
the pump.
f. When a steady flow of fuel is obtained, close the by-pass valve and check
the reading on the pressure gauge. It should read 4 to 4.75 psi maximum, no
flow. Do not keep by-pass valve closed for more than one minute during pump
operation and adjustment.
g. Repeat steps b through f for the other pump.
h. If the proper pressure is not obtained, the plunger spring may be replaced
or it may be necessary to replace the complete pump assembly.
i. Reconnect the original fuel line to the pump. Open fuel selector and run
the pump to check for any fuel leaks.
j . Shut off the pump, close the fuel selector and replace and secure the access
panel.

9-43. INSTALLATION OF FUEL PUMPS.
a. Install the fuel pump on PA-28-140,-150, -160, and -180 airplanes by the following
procedure:

1. Position the fuel pump tothe engine mount frame and secure with bolts,
washers and nuts.
2. Connect the fuel lines to the pump.
3. Connect the electrical leads to the pump.
4. Turn the fuel shutoff on and operate the fuel pump. Check all fuel line
fittings for leakage.
5. Install the cowling.
b. Install the fuel pump(s)on PA-28-235 airplanes by the following procedure:
1. Position the fuel pump(s) behind the main spar and secure with bolts,
washers and nuts.
2. Connect the inlet and outlet lines to the pump.
3. Connect the electrical leads to the pump.
4. Turn the fuel selector on and operate the pump(s). Check all fuel line
fittings for leakage.
5. Install the pump cover with attaching screws.
6. Install the bottom section of the rear seat.
7. Install the fuel drain cover with attaching screws.

Reissued: 1/15/81

3D9

FUEL SYSTEM

PIPER CHEROKEE SERVICE MANUAL
9-44. ROTARY FUEL PUMPS (WELDON) (PA-28R).
9-45. REMOVAL OF FUEL PUMP.
a.
b.
c.
d.
e.
f.

Remove the engine cowling from the aircraft.
Ensure the fuel shutoff valve is in the off position.
Disconnect the electrical leads from the pump.
Disconnect the fuel lines from the pump.
Remove the cap screws, washers, and plate.
Remove the fuel pump from the airplane.

9-46. REPAIR OF FUEL PUMP.
-CAUTION Overhauling fuel pump is not recommended
because of special tools needed. If overhauling
is necessary,the pump should be returned to:
The Weldon Tool Company
300 Woodhill Road
Cleveland, Ohio 44104
However, some repairs may be accomplished as follows:
a. Replacing the shaft seal.
1. Remove the pump end assembly from the motor by removing the four machine screws.
2. Pry the shaft seal loose from the insert.
3. Check the shaft for burrs, scratches or any defects which might cause the seal to wear.
Any defect would be cause for pump replacement.
4. Replace the seal on the shaft and press into place.
5. Install the pump end assemblyto the motor in its original position. Install the four machine
screws and safety.
b. Repairing the relief valve.
1. Remove the adjusting screw from the pump end assembly. Do not change the position
of the jam nut.
2. Remove the valve plunger and spring.
3. Inspect the valve seat, plunger and spring for condition and wear. If the valve seat is
damaged, replace the pump.
4. Install the plunger, spring, and adjusting screw to the pump.
5. Adjust the pump pressure as described in paragraph 9-47 or 9-48.
c. Replacing fitting O-rings.
- WARNING If O-rings are defective or if inlet fitting is not
properly installed, air will be drawn into fuel line,
causing engine to run lean or stop running. Install
new O-rings whenever fuel pump is removed for
service.
1. Remove inlet and outlet fittings.
2. Remove O-rings. Inspect chamfered O-rings seat for nicks.

Reissued: 1/15/86

3D10

FUEL SYSTEM

PIPER CHEROKEE SERVICE MANUAL
3. Install new O-rings.
- CAUTION Seal all pipe threads with Lubon #404.Do not apply
to the first two threads or sealant may enter fuel
system.
4. Replace fittings. Torque to 230-360in.-lb.
9-47. ADJUSTMENT OF ELECTRIC FUEL PUMP (BENCH TEST).
a. Ensure that the pump is sufficeintlylubricated to prevent damage.
b. Connect the electric leads to a 14-voltDC power source.
c. Using an approved container with the proper octane fuel, connect a fuel line
from the container to the inlet fitting.
d. Connect another line from the pump outlet to a pressure gauge and by-passvalve
and back to the container.
e. Run the pump with the by-pass valve open until a steady flow of fuel is obtained.
f. Close the by-pass valve and check the pressure gauge for a proper reading of 26
to 29 psi, no flow. Do not keep the by-passvalve closedfor more than one minute
during pump operation and adjustment.
g. Loosen the locknut and turn the adjusting scre until there is a reading of 29 psi
maximu, no flow, on the gauge. Repeat steps e, f, and g until the proper pressure
is obtained.
h. Disconnect the power source from the pump and lock the adjustment screw with
the locknut. Remove the fuel lines from the pump.
9-48. ADJUSTMENT OF ELECTRIC FUEL PUMP (IN AIRPLANE).
a. With the access panel removed and the fuel selector valve in the OFF position,
remove the fuel line from the outlet end of the pump.
b. Connect a test line with a by-pass valve and pressure gauge to pump outlet.
c. Place a container below the pump to catch any fuel from the test line.
d. Turn the fuel selector valve on, open the by-pass valve on the test line, and start
the pump.
e. When fuel flow becomes steady, clsoe the by-pass valve and check the reading
on the pressure gauge. The gauge should read 26 to 29 psi, no flow. Do not keep
the by-pass valve closed for more than one minute during pump operation and
adjustment.
f. Loosen locknut on adjusting screw and turn the screw to obtain the proper
pressure of 29 psi maximum, no flow. Repeat this step until adjustment is
complete. Lock adjusting screw with locknut.
g. turn off fuel pump and close fuel selector valve. Remove the test line from the
pump.
h. connect the original fuel lines to the pump. Open fuel selector valve and run
the pump to check for any fuel leaks.
i. Shut off the pump, close the fuel selector valve and replace access panel.

Revised: 1/15/86

3D11

FUEL SYSTEM

PIPER CHEROKEE SERVICE MANUAL
9-49. INSTALLATION OF FUEL
PUMP.
a. Place fuel pump inside cover
assembly and secure with cap
screws, washers and plate. -

C349

WARNING If O-rings are defectiveor if inlet fitting
is not properly installed, air will be
drawn into fuel line, cuasing engine to
run very lean or stop running. Install
new O-rings whenever fuel pump is
removed for service.

1.
2.
3.
4.
5.
6.
7.

b. Inspect chamfered O-ring seat
for nicks.
c. Install new O-rings between
the fittings and the pump.
d. Connect fittings to fuel pump.
Torque to 230-360in.-lb.
e. Connect fuel linesto fuel pump
fittings.
f. Connect the electrical leads to
the pump.
g. Turn the fuel selector valve on
and operate the fuel pump. Check
the line fittings for leakage.
h. Install the cowling.

CHECK BALL
BALL SPRING
RETAINER SCREW
"O"
RINGS
CYLINDER
SEALING SPRING
PISTON

Figure 9-13.

8.
9.
10.
II.
12.
13.

STOP PIN
PUMP HANDLE
FACE NUT
WASHER
LOCK NUT
SEALING PIN

Engine Primer

9-50. ENGINE PRIMER PUMP.
9-51. REMOVAL OF ENGINE PRIMER (Refer to Figure 9-13).
a. Disconnect the fuel lines from the primer behind the instrument panel.
b. Loosen the locknut (12) from behind the panel.
c. Unscrew the knurled face nut (10), withdraw the pump handle (9) and piston (7)
from the cylinder (5).
d. Remove the remaining portion of the primer.
9-52. DISASSEMBLY, CLENAING, AND ASSEMBLY OF ENGINE PRIMER
(Refer to Figure 9-13).
a. The primer may be disassembledafter removal by removingthe screws(3), springs
(2), and check balls (1) from the end of the cylinder housing.
b. Clean the primer parts with acetone or a dry type solvent.
c. Install new O-rings to the piston (7) and lubricate with light motor oil.
d. Install the balls (1), springs (2), and screws (3) to the cylinder housing.
e. Insert the pump handle (9) and piston (7) into the cylinder (5), finger tighten the
knurled face nut (10).
f. Immerse the pump in gasolineand operate severaltimes to ensure proper operation.

Revised: 1/15/86

3D12

FUEL SYSTEM

PIPER CHEROKEE SERVICE MANUAL

9-53. INSTALLATION OF ENGINE PRIMER PUMP. (Refer to Figure 9-13.)
a. Remove the pump handle (9) and piston (7) by unscrewing the knurled face
nut (10), if previously installed.
b. Insert the cylinder assembly through the back side of the panel.
c. Insert the piston into the cylinder (5) and tighten the knurled face nut.
d. Position the primer and tighten the locknut (12) on the cylinder behind the
panel.
e. Connect the fuel lines to the primer.
f. Disconnect the primer line inside the engine compartment.
Operate the
pump to ascertain proper operation.
9-54. PRIME JETS.
a. To remove the prime jets, disconnect the supply line from each jet. With
a deep socket and light pressure, remove the jet from the cylinder.
b. To clean the jet, soak in a carbon remover solution long enough to loosen
Do not use sharp objects or wire
any dirt and blow clean with air pressure.
brush to clean the jet tube.
c. Install the jet finger tight to assure that the threads are not crossed and
then torque 60 inch-pounds. Align and install the fuel supply lines, tighten to a
snug fit.
NOTE
Should further fuel stoppage of the primer
exist, check the supply lines for stoppage,
collapsed walls.

system
bent or

9-55. CLEANING FUEL SYSTEM.
a. To flush the fuel tanks and selector valve, disconnect the fuel line at the
carburetor or injector.
b. Select a fuel tank, turn on the electric fuel pump and flush fuel through the
system until it is determined there is no dirt and foreign matter inthe fuel valve
or tank. During this operation, agitation of the fuel within the tank will help pick
up and remove any dirt.
c. Repeat this procedure for each tank.
d. When all tanks are flushed, clean all filters.

Reissued: 1/15/81

3D13

FUEL SYSTEM

3D14
INTENTIONALLY LEFT BLANK

PIPER CHEROKEE SERVICE MANUAL

TABLE IX-III.
Trouble
Failure of fuel to flow.

Fuel gauge fails to
operate.

Reissued: 1/15/81

FUEL SYSTEM TROUBLESHOOTING
Cause

Remedy

Blockage in fuel line.

Flush fuel system.

Blockage of cap vent.

Check and clean vent
hole in cap.

Failure of mechanical
or electrical fuel pump.

Check and replace if
necessary.

Failure of fuel selector
to be in proper position.

Check position of
selector and adjust
if required.

Damage of fuel
selector valve.

Replace fuel valve.

Broken wire.

Check and repair.

Gauge inoperative.

Replace.

Float partially or
completely filled
with fuel.

Replace float.

Circuit breaker open
or fuse blown.

Check and reset or
replace.

Incomplete ground.

Check ground connections at fuel transmitter in wings.

Float and arm assembly of fuel transmitter
in wing sticking.

Check fuel transmitter
in wings and repair or
replace.

3D15

FUEL SYSTEM

PIPER CHEROKEE SERVICE MANUAL

TABLE IX-III.

FUEL SYSTEM TROUBLESHOOTING (cont)

Trouble

Cause

Remedy

Fuel gauge indicates full
when tanks are not full.

Complete

No fuel pressure
tion.

Fuel valve stuck.

Check valve.

No fuel in tanks.

Check fuel level and fill.

Defective fuel pump.

Check pump for pressure build up. Check
diaphragm and relief
valves in engine pump.
Check for obstructions
in electric pump. Check
by-pass valve. Air
leak in intake lines.

indica-

transmitter

ground on

wire.

Defective gauge.

Check O-rings for
damage and inlet fitting
for proper installation.
Replace gauge.

Failure of fuel
selector to be in
proper position.

Check position of selector and adjust if required.

Obstruction in inlet
side of pump.

Trace lines and locate
obstruction.

Faulty by-pass valve.

Replace.

Faulty diaphragm.

Replace or rebuild pump.

Fuel line damaged
or improperly
installed.
Worn "O" rings.

Locate and repair or
tighten.

Air leak in intake
lines.
Pressure low or
pressure surges.

Unidentified leak.

Fuel valve leaks.

Revised: 1/15/86

Check ground connections at fuel transmitting in wings.

3D16

Replace "O" rings or
valve.

FUEL SYSTEM

PIPER CHEROKEE SERVICE MANUAL

C351

I

.219"

R

.188"HOLE
3 REQ.
(T.M.M.P.)
I

9.938"

2 WOOD
SCREWS

EVENLY
SPACED

MATERIAL
LIST

2024-T3
ALUM.
2-8.75x9.938x.125
1.8.75x 6 x .75RICH
LITE,
MASONITE
ORHARDWOOD
1.8.75x 6 x 1 RICHLITE
LITE,
MASONITE
ORHARDWOOD
1-1.50 x 6 x .50RICHLITE
CHLITEMASONITE
ORHARDWOOD
.50
RICHLITE,MASONITE
ORHARDWOOD
1 2.50x 6.25x .50
I 2. 1.625 x 2.50x .125
2024-T3 ALUM.
ALUM.
1252024-T3
6 WOOD
SCREWS
26WOOD
SCREWS
EVENLY
SPACED

i

t

. "1
Figure 9-14.

Reissud:d:1/15/81
1/15/81

Fabricated Fuel Quantity Transmitter

3D17

Checking Jig

FUELSYS TEM

SECTION X
INSTRUMENTS
Paragraph
10-1.
10-2.
10-3.
10-6.
10-9.

10-17.

10-24.

10-28.

Aerofiche
Grid No.

General .....................................................
Non-Electrical Instruments ....................................
Vacuum System ..............................................
10-4.
Vacuum System Service Tips ..........................
10-5.
Troubleshooting .....................................
Suction Gauge ...............................................
10-7.
General ............................................
10-8.
Troubleshooting .....................................
Vacuum Regulator Valve ......................................
10-10. General ............................................
10-11. Troubleshooting .....................
...........
10-12. Adjustment of Vacuum Regulator Valve
(Without Vacuum Warning Lights) ................
10-13. Adjustment of Vacuum Regulator Valve
(With Vacuum Warning Lights) ...................
10-14. Adjustment of Vacuum Warning Light Pressure
Switch ........................................
10-15. Adjustment of Vacuum Turn and Bank Indicator
Regulator Valve.................................
10-16. Removal and Replacement of Regulator Valve ..........
Vacuum Pump ...............................................
10-18. General ............................................
10-19. Troubleshooting .....................................
10-20. Removal of Vacuum Pump ...........................
10-21. Replacing Pump Fittings .............................
10-22. Installation of Vacuum Pump .........................
10-23. Instrument Air System ...............................
Directional Gyro .............................................
10-25. General . ..
..................................
10-26. Troubleshooting .....................................
10-27. Removal and Replacement............................
Gyro Horizon ................................................
10-29. General ............................................
10-30. Troubleshooting .....................................
10-31. Removal and Replacement............................

Reissued: 1/15/81

3D18

3D22
3D22
3D22
3D22
3D24
3E21
3E21
3E21
3E21
3E21
3E21
3E21
3E22
3E22
3E24
3E24
3E24
3E24
3F1
3F1
3F1
3F2
3F2
3F3
3F3
3F5
3F6
3F6
3F6
3F7
3F8

Aerofiche

Grid No.
10-32.

10-36.

10-40.

Rate of Climb Indicator .........
10-33. General ............
10-34. Troubleshooting .......
10-35. Removal and Replacement
SensitiveAltimeter .....
10-37. General ............
10-38. Troubleshooting .......
10-39. Removal and Replacement
Airspeed Indicator ............
10-41.

10-44.

10-48.

General

......

10-42. Troubleshooting .......
1043.
Removaland Replacement
MagneticCompass ...........
10-45. General ............
10-46. Adjustment of Compass . .
10-47. Troubleshooting .......
ManifoldPressureGauge ....
10-49.

General ............

10-56..

10-50. Troubleshooting .......
10-51. Removal and Replacement
Tachometer Indicator .
.........
10-53. General ............
10-54. Troubleshooting .......
10-55. Removal and Replacement
Engine Oil PressureGauge .......

10-60.

10-58. Troubleshooting .......
10-59. Removal and Replacement
Fuel PressureGauge ...........

10-52.

10-57.

10-61.

10-64.
10-67.
10-69.

............

General ............

10-62. Troubleshooting .......
10-63. Removal and Replacement
Turn and Bank Indicator ....
10-65. General ............
10-66. Troubleshooting .......
Electrical Instruments ..........
10-68. Removal and Replacement
Fuel Quantity Indicator .........
10-70. General ............
10-71. Troubleshooting .......
10-72. -

10-73.

General

Removal and Replacement

Oil Temperature Indicator ...
10-74. General ............
10-75. Troubleshooting ......
10-76. Removal and Replacement

Reissued: 1/15/81

.....................
...........
......................
......................
......................
......................
....................
....................
....................
....................
....................
....................
. ....................
....................
. ....................
....................
....................
....................
....................
.....................
....................
....................
....................
....................
....................
......................
....................
.............
....................
......................
....................
.....................
.....................
....................
....................
....................
............
...........
.....................
.................

3F8
3F8
3F8
3F9
3F9
3F9
3F10
. 3F11
..
. .3F11
. .3F11
. .3F12
. .3F12
. .3F13
. .3F13
. .3F13
. .3F14
3F15
.. 3F15
..3F15
3F15
. .3F15
. .3F15
3F16
33F16
3F16
3F16
3F17
........ 3F17
3F17
3F17
3F18
3F19
3F19
3F19
3F19
3F20
......... 3F20
..........
3F20
3F20
..... 3F20

.......

....................

3F21

......................
..............

................
...............

3D19

3F21
........ 3F21

......
.......

3F21
3F21

Aerofiche
Grid No.
10-77.

10-81.
10-83.
10-85.
10-87.
10-89.

10-93.

10-97.
10-98.

Ammeter .....................................
10-78. General ...............................
10-79. Troubleshooting ...........................
10-80. Removal and Replacement .....................
Removal and Replacementof Face Mounted Instruments ........
10-82. General ...............................
Removal and Replacementof Cluster Mounted Instruments ........
10-84. General ...............................
Exhaust Gas Temperature Gauge (Alcor) .
........ ..... ....
10-86. General ..............................
...........
Cleaningand Inspection ............................
10-88. Troubleshooting ..........................
Cylinder Head Temperature Gauge .....................
10-90. General ................................
10-91. Troubleshooting ..........................
10-92. Removal and Replacement ....................
Fuel Flow Gauge .................................
10-94. General ..............................
...........
10-95. Troubleshooting ..........................
10-96. Removal and Replacement ....................
Piper AutoControl System ..........................
Annunciator Panel .............
...................
10-99. General ................................
10-100. Troubleshooting . . . . . . . . . . . . . . . . . . . ........
10-101. Removal and Replacement .....................

Reissued: 1/15/81

3D20

.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

3F21
3F21
3F21
3F21
3F21
3F22
3F22
3F22
3F22
3F22
3F23
3F23
3G3
3G3
3G3
3G3
3G3
3G3
3G4
3G4
3G4
3G4
3G4
3G4
3G4

3D21
INTENTIONALLYLEFT BLANK

PIPER CHEROKEE SERVICE MANUAL

SECTIONX
INSTRUMENTS
10-1. GENERAL. The instrumentation in the Cherokee is designed to give a quick and
actual indication of the attitude, performance and condition of the airplane. Maintenance,
other than described in these sections, shall be done by the instrument manufacturer or an
authorized repair station.
The two types of instruments have been classified in this section as non-electrical and
electrical. The first part of this section will pertain to maintenance and troubleshooting of
all the instruments and their systems which depend on non-electrical sources for their
operation. The remaining portion of this section is directed to maintenance and
troubleshooting of all the electrically operated instruments.
10-2. NON-ELECTRICALINSTRUMENTS.
10-3. VACUUMSYSTEM.
10-4. VACUUM SYSTEM SERVICE TIPS. The following information is intended to
acquaint field service personnel with a means to diagnosevacuum system servicesymptoms
on those components which are serviced by removal and replacement. These items include
hoses, clamps, gyro filters, vacuum regulatingvalvesand vacuum gauges.
a. Hoses and Clamps:
1. These items should be examined periodically and inspected carefully whenever
engine maintenance activities cause hose disconnections to be made at the pump, regulating
valve, gyros and/or vacuum gauge.
2. The ends of the hoses should be examined for rubber separation and slivers of
rubber on the inside diameter of the hoses. These slivers can and do become detached. If
this happens, the vacuum pump suck these loose particles and eventually ingest them. This
can cause premature pump service.
3. Hose clamps and fittings should be replaced when broken, damaged or corroded.
CAUTION
When replacing any of the threaded fittings, DO NOT USE
PIPE DOPE or any other anti-seize tape or compound. The
AIRBORNE fittings are all cadmium plated to avoid the need
for any other anti-seizematerials. The reason for this caution
is to protect the pump from ingesting any foreign materials
that could cause premature service.

Reissued: 1/15/81

3D22

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

b. Vacuum Gauges:
1. Vacuum gauges seldom require service and usually are replaced when
malfunctions occur.
NOTE
Vacuum gauge failure in a properly operating vacuum system
does not impair safety of flight.
2. If the vacuum gaugemalfunctions in a manner to cause an incorrect reading in
normal cruise conditions, the gaugemust be checked by comparing the reading with a gauge
of known accuracy. If the gauge is indicating correct values and the system vacuum level is
not in accordance with the specifiedvacuum, then and only then should the regulator be
reset.
3. Visual examination of the gaugeperformance should cover the followingsteps:
(a) With engine stopped and no vacuum applied to the gauge, its pointer should
rest against the internal stop in the 9 o'clock position. Any other
displacement from this position suggestsneed for replacement.
(b) A slight overshoot during engine startup, not to exceed half an inch (1/2")
of mercury, is normal and is not causeto replace gauge.
(c) With engine operating at normal cruiseRPM, the gaugeshould read from 4.9
inches to 5.1 inches of mercury (vacuum).
(d) At 1200 RPM, the vacuum gaugereading should be more than four inches of
mercury.
c. Gyro Filters:
1. Gyro filters must be servicedon a scheduled basis, not to exceed 100 hours, or
sooner as condition indicates.
NOTE
Several gyro filter systemshave been used on various aircraft,
depending on when the aircraft was built.
2. The oldest aircraft installations generally did not have central filters. They
depended on the small cloth or paper disc-typefilters built into the instruments themselves.
This type of filter requires frequent replacement for proper gyro operation.
3. The later system installation employed a large central filter which eliminatedthe
frequent replacement of the small internal filters in the gyros.
4. The latest system installation employs a large central filter and differential
vacuum gauge that continuously monitors the filter condition while indicating vacuum
readings.
NOTE
In the aircraft systems described in items (2) and (3) above,
failure to replace filters would cause a slight increase in
vacuum gauge readings. The AIRBORNE regulator will
automatically adjust to the flow changes that result when
dirty filters are allowed to remain in the system.

Reissued: 1/15/81

3D23

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

NOTE
The latest systems which employ a central filter in
combination with a differential vacuum gauge will indicate a
decline in panel gauge reading when the filter becomes
clogged and vacuum declines below the recommended value.
The filters should be replaced when gauge reading declines
below the recommended value; do not adjust regulator.
d. Vacuum Regulator:
1. The vacuum regulatingvalve seldom needs replacement. Symptoms that suggest
replacement are:
(a) Chatter as indicated by rapid fluctuation of the vacuum gauge needle or an
audible sound.
(b) Non-repeatability of the vacuum gauge reading when the panel gauge is not
suspect or has been checked against a known test gauge (cruise RPM only).
2. All modes of regulator malfunction tend to increase the vacuum power applied
to the gyros. Thus, although excess vacuum is applied, a loss of vacuum does not occur.
3. The gyros themselves act as a limiting device to keep the vacuum power applied
from exceeding safe levels.
NOTE
If the panel gauge has been checked and found OK and the
vacuum gaugereading does not repeat within the range of 4.8
to 5.2 inches of mercury, then the regulating valveshould be
changed. Observe the usual precautions for maintaining
system cleanlinessto avoid premature pump service.
10-5. TROUBLESHOOTING.
TABLEX-I. VACUUMSYSTEM
NOTE
Aircraft Serial Numbers prior to: 28-7125001, 28-7105001,
28-7110001, 28S-7105001, 28R-7130001 and 28R-7135001.

Trouble
No vacuum pressure
gauge indication.

Reissued: 1/15/81

Cause.
Pump inoperative. Disconnected, broken or
restricted lines

3D24

Remedy
Replace pump. Locate
trouble and correct.

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

TABLEX-I. VACUUMSYSTEM(cont)
Remedy

Trouble

Cause

No vacuum gaugeindication at instrument.

Hose from instrument to
gauge leaking or restricted.

Check all lines and
connections.

No vacuum gauge indication at either instrument or source.

Faulty gauge.Malfunctioning, regulator
valve,or vacuum pump.

Check operation of
instrument. If operation is normal, replace gauge.If instruments are inoperative,
check operation of
vacuum pump or regulator
valve.

Vacuumlines restricted
or broken.

Check system.

Vacuum regulator valve
incorrectly adjusted.

Adjust regulator valves
in accordance with
Adjustments of this
section.

Leakingof the system
lines or fittings.

Checkall lines and
fittings.

Malfunctioningpump.

Replace pump.

Overboardline from
vacuum pump restricted.
Sealingplugs loose in
gyros.

Replace line.

Instruments air filter
elements dirty.

Remove and clean or
replace.

Line restricted between gyro and filter.

Check all lines and
fittings.

Low vacuum system
pressure.

Normal pressure indication, but sluggish
operation of instruments.

Reissued: 1/15/81

3E

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

TABLEX-I. VACUUMSYSTEM(cont)
Trouble

Cause

High system pressure.

Vacuum regulator valve
incorrectly adjusted.

Adjust in accordance
with Adjustments of
this section.

Vacuum regulator valve
sticking or dirty
screen.

Clean and check operation of regulator
valve.

Faulty gauge.

Replace gauge.

Remedy

Aircraft Serial Numbers: 28-7125001,28-7105001,28-7110001,28S-7105001,
28R-7130001,28R-7135001and above.
No acuum gaugeindication at instrument.

Filter cloggedor
dirty.

I Clean or replace filter.

Line from gyro to
filter restricted.

Check line.

No vacuum gauge indication at instrument or
source.

Faulty gaugemalfunctioning pump.

Replace gauge.

Low vacuum system
pressure.

Filter dirty.

Clean or replace filter.

Vacuum regulator valve
incorrectly adjusted.

Adjust regulator valve
in accordance with
Adjustments in this
section.

Line from gyros to
filter restricted.

Repair line.

Line from pump to gyros
leaking.

Check all lines and
fittings.

Faulty instrument.

Replace instrument.

Normal pressure indicabut sluggishoperation
of instruments.

Reissued: 1/15/81

3E2

Replace pump.

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

TABLEX-I. VACUUMSYSTEM(cont)
Trouble
High system pressure.

Regulator cannot be
adjusted to produce
correct pressure.

Vacuum correct on
ground but will not
maintain pressure at
altitude.

Vacuum correct but
pilot reports pressure
erratic or shows
complete loss in
flight.

Pressure can only be
maintained at full
throttle on ground.

Reissued: 1/15/81

Cause

Remedy

Vacuumregulator incorrectly adjusted.

Adjust regulator.

Vacuum regulator
sticking or dirty
screen.

Clean and check operation of regulator.

Linesleaking.

Check lines and fittings.

Vacuum pump malfunctioning.

Replace pump.

Vacuumpump malfunctioning.

Replace pump.

Regulator sticky.

Clean regulator.

Regulator sticky.

Clean regulator.

Oil in pump due to
leaky engine seal
or cleaningfluid
blown into pump
while cleaningengine.

Replace pump.

Leak in system.

Repair or replace
lines.

Worn pump.

Replace pump.

Stuck regulator.

Clean or replace
regulator.

3E3

INSTRUMENTS

PIPERCHEROKEESERVICEMANUAL

POH

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
IS.
16.
17.
18.

STALL WARNING INDICATOR
CLOCK
TURN INDICATOR
AIRSPEED INDICATOR
DIRECTIONAL GYRO
ATTITUDE GYRO
PLACARD
VERTICAL SPEED INDICATOR
ALTIMETER
PLACARD
MARKER BEACON LIGHTS
OMNI AND GLIDE SLOPE INDICATORS
TRANSMITTER SELECTOR SWITCH
VHF TRANSCEIVERS
ADF RECEIVER
DME RECEIVER
SUCTION GAUGE
CIGAR LIGHTER

19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.

PHONE JACKS
AUTOCONTROL III AUTOPILOT
OMNI COUPLER
PITCH CONTROL
MAGNETO SWITCHES & STARTER
INSTRUMENT CLUSTER
RPM CRUISE CHART
CHECK LISTS
TACHOMETER
ENGINE PRIMER
THROTTLE QUADRANT
THROTTLE QUADRANT FRICTION LOCK
CARBURETOR HEAT CONTROL
AMMETER
SWITCH PANEL
CIRCUIT BREAKER PANEL
HEAT AND DEFROST CONTROLS

Figure 10-1. Instrument Panel, PA-28-140, Serial
Nos. 28-25000 to 28-26956 incl.

Reissued: 1/15/81

3E4

INSTRUMENTS

-

PIPER CHEROKEE SERVICE MANUAL

8

7

6

5

L

-

1
a
12
1.
2.
3.
.
5.
6.
7.

11

9

COMPASS
AIRSPEED INDICATOR
DIRECTIONAL GYRO INDICATOR
GYRO HORIZON INDICATOR
AUTONAV RADIO
SUPERHOMER RADIO
TACHOMETER

3

4

8.
9.
10.
11.
12.
13.
14.

5

6

VACUUM GAUGE
INSTRUMENT CLUSTER
TURN AND BANK INDICATOR
CLOCK
STALL WARNING LIGHT
ALTIMETER INDICATOR
RATE OF CLIMB INDICATOR

7

8

I
I

•

14

13

12

11

10

Figure 10-4. Instrument Panel

Reissued:1/15/81

3E7

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

18

17 16

15 14

1.

COMPASS

2.
3.
4.
5.
6.

AIRSPEED INDICATOR
DIRECTIONAL GYRO
GYRO HORIZON
MARKER BEACON RECEIVER CONTROL
OMNI AND GLIDE SLOPE INDICATORS

7.
8.
9.
10.
11.
12.

13

12

ADF RECEIVER AND INDICATOR
TACHOMETER
VACUUM INDICATOR
COMMUNICATIONS AND NAVIGATION TRANSCEIVERS
ENGINE AND FUEL SYSTEM INSTRUMENT CLUSTER
OME CONTROL AND INDICATOR

11

13.
14.
15.

16.
17.
18.

10

AUTOCONTROL II AUTOPILOT
STALL WARNING LIGHT
TURN AND BANK INDICATOR
ALTIMETER
VERTICAL SPEED INDICATOR
CLOCK

Figure 10-5. Instrument Panel, PA-28-150, -160, -180
Serial Nos. 28-1761 to 28-4377 incl.

Reissued: 1/15/8J

3E8

INSTRUMENTS

PIPER CHEROKEESERVICEMANUAL

C353

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.

STALL WARNING LIGHT
CLOCK
TURN AND BANK INDICATOR
AIRSPEED INDICATOR
DIRECTIONAL GYRO
ATTITUDE GYRO
HI-LO VACUUM WARNING LIGHT
VERTICAL SPEED INDICATOR
ALTIMETER
PLACARD
MARKER BEACON RECEIVER CONTROL

12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.

OMNI AND GLIDE SLOPE INDICATORS
TRANSMITTER SELECTOR SWITCH
COMMUNICATIONS AND NAVIGATION TRANSCEIVERS
ADF RECEIVER AND INDICATOR
DME CONTROL AND INDICATOR
CIGAR LIGHTER
HEAT AND DEFROST CONTROLS
AUTOCONTROL III AUTOPILOT
ENGINE INSTRUMENT CLUSTER
OMNI-COUPLER
MAGNETO SWITCHES AND STARTER

23.
24.
25.
26.
27.
28.
29.
30.
31.
32.

FUEL SYSTEM CLUSTER
TAKE-OFF AND LANDING CHECK LIST
TACHOMETER
ENGINE PRIMER
THROTTLE QUADRANT
THROTTLE QUADRANT FRICTION KNOB
CARBURETOR HEAT CONTROL
EXHAUST GAS TEMPERATURE GAUGE
SWITCH PANEL
CIRCUIT BREAKER PANEL

Figure 10-6. InstrumentPanel, PA-28-180,
SerialNos. 284378 to 28-7205328 incl.

Reissued: 1/15/81

3E9

INSTRUMENTS

i

PIPER CHEROKEESERVICEMANUAL

976

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.

-

CLOCK
COMPASS
ALTIMETER
AIRSPEED
TURN AND BANK INDICATOR
DIRECTIONAL GYRO INDICATOR
STALL WARNING LIGHT
GYRO HORIZON INDICATOR
OMNI INDICATOR
MARKER BEACON
RADIO ADF
RADIO
DISTANCE/SPEED INDICATOR
MANIFOLD PRESSURE
INSTRUMENT CLUSTER
TACHOMETER

17. SUCTION GAUGE
18. RADIO
19. MIXTURE CONTROL
20. AUTOFLITE
21. PROPELLER CONTROL
22. THROTTLE CONTROL
23. AUDIO SELECTOR
24._CARBURETOR HEAT
25. ROTATING BEACON
26. LANDING LIGHT
27. NAV AND INST. LIGHTS
28. FUEL PUMP
29. VERTICAL SPEED
30. STARTER
31. MASTER SWITCH
32. PRIMER

WHEN CONSTANT SPEED PROPELLER IS INSTALLED.

Figure 10-9. Instrument Panel, PA-28-235, Serial Nos. 28-10720 to 28-11039 incl.

Reissued: 1/15/81

3E12

INSTRUMENTS
INSTRUMENTS

PIPER CHEROKEESERVICEMANUAL

1825

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
II.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.

STALL WARNING LIGHT
CLOCK
TURN AND BANK INDICATOR
AIRSPEED INDICATOR
DIRECTIONAL GYRO
GYRO HORIZON
VERTICAL SPEED INDICATOR
ALTIMETER
MARKER BEACON RECEIVER CONTROL
OMNI AND GLIDE SLOPE INDICATORS
TRANSMITTER SELECTOR SWITCH
COMMUNICATIONS AND NAVIGATION TRANSCEIVERS
ADF RECEIVER AND INDICATOR
DME CONTROL AND INDICATOR
CIGAR LIGHTER
VACUUM INDICATOR
HEAT AND DEFROST CONTROLS
AUTOCONTROL III AUTOPILOT
ENGINE INSTRUMENT CLUSTER
OMNI-COUPLER
MAGNETO SWITCHES AND STARTER
FUEL SYSTEM CLUSTER

23.
24.
25.
26.
27.
28.
29.
30.
31.
32.

MANIFOLD PRESSURE INDICATOR
TAKE-OFF AND LANDING CHECK LISTS
TACHOMETER
ENGINE PRIMER
THROTTLE QUADRANT
THROTTLE QUADRANT FRICTION KNOB
CARBURETOR HEAT CONTROL
EXHAUST GAS TEMPERATURE GAUGE
SWITCH PANEL
CIRCUIT BREAKER PANEL

-WHEN CONSTANT SPEED PROPELLER IS INSTALLED.

Figure 10-10. Instrument Panel, PA-28-235
Serial Nos. 28-11040 to 28-7210033 incl.

Reissued: 1/15/81

3E13

INSTRUMENTS

ZZ

__

.

PIPER CHEROKEESERVICEMANUAL

1831

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.

STALL WARNING LIGHT
CLOCK
TURN AND BANK INDICATOR
AIRSPEED INDICATOR
DIRECTIONAL GYRO
ATTITUDE GYRO
HI-LO VACUUM WARNING LIGHT
VERTICAL SPEED INDICATOR ALTIMETER
GEAR UP WARNING LIGHT
GEAR IN TRANSIT LIGHT
MARKER BEACON RECEIVER CONTROL
OMNI AND GLIDE SLOPE INDICATORS
COMMUNICATIONS AND NAVIGATION TRANSCEIVERS
ADF RECEIVER AND INDICATOR
DME CONTROL AND INDICATOR
CIGAR LIGHTER
HEAT AND DEFROST CONTROLS
AUTOCONTROL III AUTOPILOT
ENGINE INSTRUMENT CLUSTER
OMNI-COUPLER
MAGNETO SWITCHES AND STARTER

23.
24.
25.
26.
27.
28.
29.
30.
31.
32.

FUEL SYSTEM CLUSTER
MANIFOLD PRESSURE - FUEL FLOW INDICATOR
TACHOMETER
LANDING GEAR CONTROL HANDLE
LANDING GEAR INDICATOR LIGHTS
THROTTLE QUADRANT
ALTERNATE AIR CONTROL
MIXTURE MONITOR
SWITCH PANEL
CIRCUIT BREAKER PANEL

Figure 10-13. Instrument Panel
PA-28R-180, Serial Nos. 28-30005 to 28-30879 incl.
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INSTRUMENTS

PIPERCHEROKEESERVICEMANUAL

1831

1. STALL WARNING LIGHT
2. CLOCK
3. TURN AND BANK INDICATOR
4. AIRSPEED INDICATOR
5. DIRECTIONAL GYRO
6. ATTITUDE GYRO
7. VERTICAL SPEED INDICATOR
8. ALTIMETER
9. GEAR UP WARNINGLIGHT
10. GEAR IN TRANSIT LIGHT
11.MARKER BEACON RECEIVER CONTROL

12. OMNI AND GLIDE SLOPE INDICATORS
13. COMMUNICATIONSAND NAVIGATION TRANSCEIVERS
14. ADF RECEIVER AND INDICATOR
15. DME CONTROLAND INDICATOR
16. SUCTION GAUGE
17. CIGAR LIGHTER
18. HEAT AND DEFROST CONTROLS
19. AUTOCONTROLIII AUTOPILOT
20. ENGINE INSTRUMENT CLUSTER
21. OMNI-COUPLER
22. MAGNETO SWITCHES AND STARTER

23. FUEL SYSTEM CLUSTER
24. MANIFOLD PRESSURE- FUEL FLOW INDICATOR
25. TACHOMETER
26. LANDING GEAR CONTROLHANDLE
27. LANDING GEAR INDICATOR LIGHTS
28. THROTTLE QUADRANT
29. ALTERNATE AIR CONTROL
30. MIXTURE MONITOR
31. SWITCH PANEL
32. CIRCUIT BREAKER PANEL
33. GEAR OVERRIDE WARNING LIGHT

Figure 10-14. Instrument Panel
PA-28R-180SerialNos. 28-30880 to 28-7130019 incl.
PA-28R-200 SerialNos. 28-30482, 28-35001 to 28-35830 incl.
and 28-7135001 to 28-7135238 incl.
Reissued: 1/15/81

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INSTRUMENTS

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.

3E20
INTENTIONALLY LEFT BLANK

PIPER CHEROKEE SERVICE MANUAL

10-6. SUCTIONGAUGE.
10-7. GENERAL. The suction gauge is mounted in the right side of the instrument panel
above the glove compartment. This gauge is calibrated in inches of mercury and indicates
the amount of vacuum created by the engine driven vacuum pump. The suction gauge
installed in "71" models have a direct pressure line and a vent line. Therefore, these aircraft
indicate the differential pressure or actual pressure being applied to the gyro instruments. As
the system filter becomes clogged or lines obstructed, the gauge will show a decrease in
pressure. Do not reset the regulator until the filter and lines have been checked.
10-8. TROUBLESHOOTING.For troubleshooting of this instrument, refer to Table X-I of
this section.
10-9. VACUUMREGULATORVALVE.
10-10. GENERAL. One vacuum regulator valve is incorporated in the system to control
vacuum pressure to the gyro instruments. The regulator valve is located under the
instrument panel. Access to the valve for maintenance and adjustment is gained from below
the instrument panel.
10-11. TROUBLESHOOTING.For troubleshooting of the vacuum regulator refer to Table
X-I.
10-12. ADJUSTMENTSOF VACUUMREGULATORVALVE. (Without VacuumWarning
Lights)
a. Loosen the locking nut or remove the protective cap from the valve, depending on
which type is installed.
NOTE
Do not attempt adjustment of this valve with the engine in
operation, without a qualified pilot or other responsible
person at the controls.
b. Start the engine, after allowingtime for warm-up, run the engine at medium RPM.
c. With the engine running at medium RPM, the suction gauge should indicate 5.0
inches of mercury ± .1 inches of mercury. If the pressure reading fails to fall within this
range, shut down the engine and adjust the regulator valve by moving the valveadjustment
screw clockwise to increase the pressure, and counter-clockwise to decrease the pressure.
Start the engine and repeat the check. With engine running at medium RPM, the suction
gauge should indicate 5.0 inches of mercury ± .1 inches of mercury. If the airplane is not
equipped with a suction gauge, it will be necessaryto connect a gauge by removingthe plug
from the back of the artificial horizon, and attaching a temporary gauge.
d. Restart the engineand repeat the check.

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INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL
e. After the system pressure has been adjusted to these recommended settings,
remove the gauge and install the plug, replace the protective cap or retighten the locknut,
whicheverapplies to the type of valveinstalled.
10-13. ADJUSTMENT OF VACUUM REGULATOR VALVE (PA-28-180, Serial Nos.
28-4378 to 28-5227; PA-28R-180, Serial Nos. 28R-30005 to 28R-30878) (With Vacuum
WarningLights).
a. Remove the plug from the back of the artificial horizon and install an appropriate
AN fitting that will accommodate a small hose from a suction gauge.
b. Locate the valve adjustment screw on the bottom of the regulator and loosen the
regulator screwjam nut.
NOTE
Do not attempt adjustment of this valve with the engine
in operation, without a qualified pilot or other
responsibleperson at the controls.
c. Start the engine, allow time for warm-up, and operate at a medium RPM.
d. With the engine operating at medium RPM,the suction gaugeshould indicate 5.0
± .1 inches of mercury. If pressure reading fails to fall within this range, shut-down the
engine and adjust the regulator valve by movingthe adjustment screw clockwiseto increase
the pressure and counterclockwiseto decrease the pressure.
e. Restart the engine and repeat the check.
f. After the system pressure has been adjusted to this recommended setting,
retighten the regulator screw jam nut, remove the suction gauge, hose and fitting. Replace
the plug into the back of the artificial horizon.
10-14. ADJUSTMENT OF VACUUM WARNING LIGHT PRESSURE SWITCH
(PA-28-180, Serial Nos. 28-4378 to 28-5227; PA-28R-180, Serial Nos. 28R-30005 to
28R-30878). The vacuum warning light switch should allow the low vacuum light to
actuate when the suction has decreased to or below 4.25 ± .2 inches of mercury, and the
high vacuum light with suction in excess of 5.2 + .2 -.0 inches of mercury. To check and
adjust the operation of the vacuum warning switch, the following procedure may be used:
a. Remove the plug from the back of the artificial horizon and install an appropriate
AN fitting that will accommodate a small hose from-a suction gauge.
b. Start the engine, allow time for warm-up and operate at a medium RPM.
NOTE
Do not attempt adjustment of any system in this
airplane with the engine in operation, without a
qualified pilot or other responsible person at the
controls.
c. Reduce RPM until low vacuum is indicated by the light, and determine if the
switch has actuated the light at 4.25 .2. Adjust by the followingprocedure:

Reissued: 1/15/81

3E22

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

LOW ADJUSTMENT

976

CLOCKWISE- INCREASES
LOWSETTING
BLACK

WHITE
YELLOW
HIGH ADJUSTMENT
CLOCKWISE - DECREASES

HIGH SETTING

Figure 10-17. Warning Light Pressure Switch
1. Increase RPM to a high setting, then decrease to 4.25 inches of mercury.
2. Adjust switch to activate the low vacuum light at this setting by locating the
vacuum switch in the back of the directional gyro. Directly in the center of the switch is a
small adjustment screw which by turning clockwisewill increase the low setting and turning
counterclockwise will decrease the low setting. (Refer to Figure 10-17.)
3. After making adjustment, recheck the vacuum switch by increasing to a high
RPM and again decreasing to a setting of 4.25. If the light does not actuate at 4.25 ± .2
inches of mercury, repeat steps 2 and 3. After proper adjustments have been made, shut
down the engine.
d. To adjust the high vacuum light, locate the valve adjustment screw on the bottom of
the regulator and loosen the regulator jam nut.
e. Start the engine and set the throttle at 1400 to 1600 RPM. Whilereading the suction
gauge, turn valve adjustment screw of the vacuum regulator clockwise to increase the
suction. At 5.2 + .2 -.0 the high vacuum light, if adjusted properly, should light. If
adjustment is proper, proceed to step g.
f. With high vacuum light not operating correctly, shut down engine and adjust by the
followingprocedure:
1. Adjustment of the high vacuum light necessitates the removal of the vacuum
warning light pressure switch. This switch, which is located in the back of the directional
gyro, has three wires that have to be disconnected and then the switch will turn from the
instrument. The adjustment screw for the switch is found inside the neck of the 1/8 NPT
fitting that threads into the directional gyro. Turning this adjustment screw clockwise will
decrease the high setting and counterclockwisewill increase the high setting.
2. After making the necessary adjustments, reinstall the vacuum switch into the
instrument and replace the wires in accordance with the Electrical System Schematic as
found in Section XI.

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INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

3. Recheck the high vacuum light by restarting the engine and increasing the
RPM. Determine if the high light indicates high vacuum at 5.2 +.2 - 0. If further adjustment
is necessary, return to step f. After proper adjustment to the high vacuum light has been
made, shut down the engine.
g. Readjust the vacuum regulator by setting throttle at a medium RPM. At this setting
the suction gauge should read from 4.6 to 5.2. To prevent intermittent actuation of the
warning light due to closeness of the pressure settings of the light pressure switch and the
vacuum regulator, it should be determined that the regulator is set 0.2 inches of mercury
less than that of the pressure switch as long as vacuum is within the required range. Make
necessary adjustments by turning clockwiseto increase the suction and counterclockwise to
decrease the suction. Then tighten the jam nut on the regulator valve adjustment screw and
remove the vacuum gauge and fitting from the back of the artificial horizon. Reinstall the
plug into the artificial horizon.
10-15. ADJUSTMENT OF VACUUM TURN AND BANK INDICATOR REGULATOR
VALVE.
a. To adjust the turn and bank indicator, remove the plug found in the back of the
instrument and install the proper AN fitting that will accommodate a small hose from a
suction gauge.
NOTE
Do not attempt adjustment of any system in this airplane,
with the engine in operation, without a qualified pilot or
other responsibleperson at the controls.
b. Start the engine and operate at a medium RPM with the suction gaugeindicating 5.0
with central air filter. If adjustment is necessary, refer to Paragraph 10-12 or 10-13.
c. With the suction gauge reading within the stated range, the gauge attached to the
turn and bank should indicate 2.0 inches of mercury. If adjustment is necessary,turning the
adjustment screw, found in the valveassemblyat the back of the instrument, clockwisewill
decrease the suction and counterclockwise will increase the suction. After the proper
reading is acquired, shut down the engine, remove the gauge,hose and fitting from the turn
and bank and install the plug.
10-16. REMOVALAND REPLACEMENTOF REGULATORVALVE.
a. To remove the regulator valve, disconnect the three lines and remove the mounting
nut. Remove the valve from the airplane.
b. Replace regulator in reverse order given for removal. Check complete vacuum system
for proper operation.
10-17. VACUUMPUMP.
10-18. GENERAL. The vacuum pump is of the rotary vane, positive displacement type. This
unit consists essentiallyof an aluminum housing containing a tempered sleevein which an offset rotor, with moving blades is incorporated. This assembly is driven by means of a coupling
mated to the engine driven gear assembly. The pump is mounted on the accessory section of
the engine.

Reissued: 1/15/81

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INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-19. TROUBLESHOOTING.For troubleshooting of the pumps, refer to Table X-I of
this section.
10-20. REMOVALOF VACUUMPUMP.
a. Remove the top portion of the engine cowling. (Refer to Section VIII.)
b. Loosen the hose clamp and remove the hose from the pump fitting.
c. Remove the four retaining nuts, lock washers and plain washers used to secure the
pump to the engine; then remove the pump.
10-21. REPLACINGPUMPFITTINGS.
a. Before installing any fittings on the pump, check for any external damage. A pump
that has been damaged or dropped should not be installed.
b. When a vise is used to hold the pump while installingfittings, suitable caution must
be exercised to avoid pump damage. The square mounting flangemust be held between soft
wood blocks and only at right anglesto the visejaws. Use only enough vise pressure to hold
the pump firmly.
CAUTION
DO NOT apply vise pressure to the outside diameter or
overall length of the pump.
c. The ports of the AIRBORNE pump have been treated with a dry film lubricant and
the AIRBORNEfittings are cadmiumplated thus eliminatingany need for thread lubricants.
If thread lubricant is required, use a powdered moly-sulfideor graphite in dry form or in an
evaporating vehicle; or employ a silicone spray. Apply sparingly to external threads of
fittings only.
CAUTION
DO NOT use pipe tape, thread dope, hydrocarbon oil or
grease, as these can contaminate the pump and cause
malfunction.
d. With the pump properly secured in the vise, insert fittings in ports and hand tighten
firmly.

e. Usinga wrench, tighten each fitting from one-half to two additional turns.

Reissued: 1/15/81

3F1

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-22. INSTALLATION OF VACUUM PUMP.
a. Place the pump gasket in its proper place and align the spline on the pump drive
with the spline on the engine drive assembly.
CAUTION
The only pump mounting gasket authorized and approved for
use on the Airborne vacuum pump is the Airborne gasket
B3-1-2, Piper part number 751 859. Use of any other gasket
may result in oil seepage or leakage at the mounting surface.
b. Secure the pump to the engine with four plain washers, lock washers and retaining
nuts. Torque the nuts 40 to 50 inch-pounds.
c. Connect the hoses to the pump and secure with hose clamps.
d. Reinstall the engine cowling.

10-23. INSTRUMENT AIR SYSTEM. (Refer to Figure 10-18.)The instrument air system
consists of a pitot air system and a static air system. The system supplies both pitot and static
pressure for the airspeed indicator, altimeter and vertical speed indicator. Refer to Figure 1018 for PA-28-140, -150, -160, -180 -235, PA-28R-180 and -200 system layout.
Pitot air system consists of a pitot mast located on the underside of the left wing, with
its related plumbing. Impact air pressure entering the pitot is transmitted from the pitot
inlet through hose and tubing routed in the wing to the airspeed indicator on the instrument
panel. A partially or completely blocked pitot head will giveerratic or zero readings on the
instruments.
Static air system consists of a static port located on the bottom of the pitot mast. The
static port is directly connected to the airspeed indicator, altimeter and rate of climb
indicator on the instrument panel by means of hose and tubing routed through the wing
along with the pitot line. An alternate static air source is located below the instrument panel
in front of the pilot. The alternate static source is part of the standard system and has a
shutoff valve which closes the port when it is not needed. A placard givinginstructions for
use is located on the instrument panel.

Reissued: 1/15/81

3F2

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-24. DIRECTIONALGYRO.
10-25. GENERAL. The directional gyro is a flight instrument incorporating an air driven
gyro stabilized in the vertical plane. The gyro is rotated at high speed by lowering the
pressure in the air tight case and simultaneously allowing atmospheric air pressure to enter
the instrument against the gyro buckets. Due to gyroscopic inertia, the spin axis continues
to point in the same direction even though the aircraft yaws to the right or left. This relative
motion between the gyro and the instrument case is shown on the instrument dial which is
similar to a compass card. The dial, when set to agree with the airplane magnetic compass,
provides a positive indication free from swing and turning error. However, the directional
gyro has no sense of direction and must be set to the magnetic compass, since the magnetic
compass is subject to errors due to magnetic fields, electric instruments, etc. The directional
gyro is only accurate for the heading it has been set for. If the gyro is set on 270° , for
instance, and the aircraft is turned to some other heading, there can be a large error between
the gyro and the magnetic compass due to the error in compass compensation. This will
appear as gyro precession. The gyro should only be checked to the heading on which it was
first set. Due to internal friction, spin axis error, air turbulence and airflow, the gyro should
be set at least every 15 minutes for accurate operation, whether it has drifted or not.

Reissued: 1/15/81

3F3

INSTRUMENTS

PIPER CHEROKEESERVICEMANUAL

C358

5

1.
2.
3.
4.
5.

INDICATOR
ALTIMETER
AIRSPEED INDICATOR
PITOT HEAT SWITCH
VERTICAL SPEED INDICATOR
PITOT HEAD

Figure 10-18.Typical Pitot Static System
(PA-28-140,-150, -160, -180, -235, PA-28R-180 and 200)
Reissued: 1/15/81

3F4

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-26. TROUBLESHOOTING.
TABLEX-II. DIRECTIONALGYRO INDICATOR
Trouble
Excess drift in either
direction.

Cause

Remedy

Setting error.

Paragraph 10-25.

Defectiveinstrument.

Replace instrument.

High or low vacuum.
If vacuum is not
correct, check for the
following:
a. Relief valveimproperly adjusted.
b. Incorrect gauge
reading.
c. Pump failure.
d. Vacuum line kinked
or leaking.

a. Adjust.

Dial spins during turn.

Limits (55 ° bank) of
gimbal exceeded.

Recage gyro in level
flight.

Dial spins continuously.

Defectivemechanism.

Replace.

Reissued: 1/15/81

3F5

b. Replacegauge.
c. Repair or replace.
d. Checkand repair.
Checkfor collapsed
inner wall of hose.

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-27.REMOVAL AND REPLACEMENT. The following procedure pertains to aircraft
having the Edo-Aire Air Driven Gyro installation. For installations other than Edo-Airerefer
to Paragraph 10-81of this section.
NOTE
Permit no oil, grease, pipe compound or any foreign material
to enter parts prior to installation of fittings. Make sure that all
air lines are clean and free of foreign particles and/or residue
before connecting lines to gyro. Do not use thread lube on
fittings or in parts.
The use of teflon tape on fitting threads is recommendedand should be installed as follows:
a. Lay teflon tape on threads keepingone thread visiblefrom the end of the fitting. Hold in
place and wrap in the direction of the threads.
b. Apply sufficienttension whilewinding to assure that tape conforms to thread grooves.
One full wrap plus 1/2" overlap is sufficient.
c. After completing wrap, maintain tension and tear tape by pulling in direction of wrap.
Do not cut tape.
d. Press tape well into threads.
e. Screw fitting into part being careful not to exceed touque requirementsnoted on decal
on the cover of the gyro. (Referto Table,II-II .ConsumableMaterials,for specifications
and Manufacturer's address.)
10-28. GYRO HORIZON.
10-29. GENERAL. The gyro horizon is essentially an air driven gyroscope rotating in a
horizontal plane and is operated by the same principal as the directional gyro. Due to the
gyroscopic inertia, the spin axis continues to point in the vertical direction, providing a
constant visual reference to the attitude of the airplane relative to pitch and roll axis. A bar
across the face of the indicator represents the horizon and aligningthe miniature airplane to
the horizon bar simulates the alignment of the airplaneto the actual horizon. Any deviation
simulates the deviation of the airplane from the true horizon. The gyro horizon is marked
for different degreesof bank.

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INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-30. TROUBLESHOOTING.
TABLEX-III. GYRO HORIZONINDICATOR
Trouble
Bar fails to respond.

Bar does not settle.

Bar oscillatesor
shimmies continuously.

Instrument does not
indicate level flight.

Cause

Remedy

Insufficient vacuum.

Check pump and tubing.

Filter dirty.

Clean or replace filter.

Insufficient vacuum.

Check line and pump.
Adjust valve.

Incorrect instrument.

Check part number.

Defective instrument.

Replace.

Instrument loose in
panel.

Tighten mounting screws.

Vacuum too high.

Adjust valve.

Defectivemechanism.

Replace instrument.

Instrument not level in
panel.

Loosen screwsand level
instrument.

Aircraft out of trim.

Trim aircraft.

Bar high after 180°
turn.

Normal, if it does not
exceed 1/16 inch.

Instrument tumbles in
flight.

Low vacuum.

Reset regulator.

Dirty filter.

Clean or replace filter.

Line to filter restricted.

Replace line.

Plugmissing or loose
in instrument.

Replace or tighten plug.

I

I

Revised: 8/3/81

3F7

I

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-31. REMOVALAND REPLACEMENT. Refer to Paragraph 10-27of this section.
10-32. RATE OF CLIMBINDICATOR.
10-33. GENERAL. The rate of climb indicator measures the rate of change in static
pressure when the airplane is climbing or descending. By means of a pointer and dial this
instrument will indicate the rate of ascent or descent of the airplane in feet per minute. But
due to the lag of the instrument, the aircraft will be climbing or descending before the
instrument starts to read and the instrument will continue to read after the aircraft has
assumed level flight. In rough air this should not be considered a malfunction.
10-34. TROUBLESHOOTING.
TABLEX-IV. RATE OF CLIMBINDICATOR
Trouble

Cause

Remedy

Pointer does not set
on zero.

Aging of diaphragm.

Reset pointer to zero
by means of setting
screw. Tap instrument
while resetting.

Pointer fails to
respond.

Obstruction in static
line.

Disconnect all instruments connected to the
static line. Clear line.

Pitot head frozenover.

Pointer oscillates.

Reissued: 1/15/81

Waterin static line.

Check individualinstruments for obstruction
in lines.

Obstruction in pitot
head.

Clean lines and head.

Leaks in static lines.

Disconnect all instruments connected to the
static line. Check
individualinstruments
for leaks. Reconnect
instruments to static
line and test installation for leaks.

Defectivemechanism.

Replace instrument.

3F8

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

TABLE X-IV. RATE OF CLIMBINDICATOR(cont)
Trouble

Cause

Remedy

Rate of climb indicates when aircraft
is banked.

Water in static line.

Disconnect static lines
and blow out lines from
cockpit out to pitot
head.

Pointer has to be
set before every
flight.

Temperature compensator inoperative.

Replace instrument.

Pointer cannot be reset
to zero.

Diaphragmdistorted.

Replace instrument.

Instrument reads very
low during climb or
descent.

Case of instrument
broken or leaking.

Replace instrument.

NOTE
When any connections in the static system are opened for
checking, system must be rechecked per F.A.R. 23.1325.
10-35. REMOVALAND REPLACEMENT.Refer to Paragraph 10-81 of this section.
10-36. SENSITIVEALTIMETER.
10-37. GENERAL. The altimeter indicates pressure altitude in feet above sea level. The
indicator has three pointers and a dial scale; the long pointer is read in hundreds of feet, the
middle pointer in thousandths of feet and the short pointer in ten thousandth of feet. A
barometric pressure window is located on the right side of the indicator dial and is set by
the knob located on the lower left corner of the instrument. The altimeter consists of a
sealed diaphragm that is connected to the pointers through a mechanical linkage. The
instrument case is vented to the static air system and as static air pressure decreases,the
diaphragm expands, causingthe pointers to move through the mechanicallinkage.

Reissued: 1/15/81

3F9

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-38. TROUBLESHOOTING.
TABLEX-V. ALTIMETER
Trouble

Cause

Remedy

Excessivescale error.

Improper calibration
adjustment.

Replace instrument.

Excessivepointer
oscillation.

Defectivemechanism.

Replace instrument.

High or low reading.

Improper venting.

Eliminate leak in
static pressure system
and check alignment of
airspeed tube.

Setting knob is hard
to turn.

Wronglubrication or
lack of lubrication.

Replace instrument.

Inner reference marker
fails to move when
setting knob is
rotated.

Out of engagement.

Replace instrument.

Setting knob set screw
loose or missing.

Not tight when
altimeter was reset.

Tighten instrument
screw,if loose. Replace instrument, if
screw is missing.

Cracked or loose
cover glass.

Case gasket hardened.

Replace instrument.

Dull or discolored
markings.

Age.

Barometric scale and
reference markers out
of synchronism.

Slippageof mating
parts.

Replace instrument.

Barometric scale and
reference markers out
of synchronism with
pointers.

Drift in mechanism.

Refer to the latest revision of AC 43.13-1.

Reissued: 1/15/81

3F10

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

TABLEX-V. ALTIMETER(cont)
Cause

Trouble

Remedy

Altimeter sticks at
altitude or does not
change with change of
altitude.

Water or restriction in
static line.

Remove static lines
from all instruments,
blow line clear from
cockpit to pitot head.

Altimeter changes
reading as aircraft
is banked.

Water in static line.

Remove static lines
from all instruments,
and blow line clear from
cockpit to pitot head.

Altimeter requires
resetting frequently.

Temperature compensator
inoperative.

Changeinstrument.

NOTE
When any connections in the static system are opened for
check, system must be rechecked per F.A.R. 23.1325.
10-39. REMOVALAND REPLACEMENT. Refer to Paragraph 10-81 of this section.
10-40. AIRSPEED INDICATOR.
10-41. GENERAL. The airspeed indicator provides a means of indicating the speed of the
airplane passing through the air. The airspeed indication is the differential pressure reading
between pitot air to pressure and static air pressure. This instrument has the diaphragm
vented to the pitot air source and the caseis vented to the static air system. As the airplane
increases speed, the pitot air pressure increases, causing the diaphragm to expand. A
mechanical linkage picks up this motion and moves the instrument pointer to the indicated
speed. The instrument dial is calibrated in knots and miles per hour, and also has the
necessary operating range markings for safe operation of the airplane.

Reissued: 1/15/81

3F11

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-42. TROUBLESHOOTING.

TABLEX-VI. AIRSPEEDTUBES AND INDICATOR
Trouble

Cause

Remedy

Pointers of static
instruments do not
indicate properly.

Leak in instrument case
or in pitot lines.

Check for leak and seal.

Pointer of instrument
oscillates.

Defectivemechanism.

Replace instrument.

Instrument reads high.

Pointer not on zero.

Replace instrument.

Leaking static system.

Find leak and correct.

Pointer not on zero.

Replace instrument.

Leaking static system.

Find leak and correct.

Pitot head not aligned
correctly.

Realign pitot head.

Water in pitot line.

Remove lines from static
instruments and blow
out lines from cockpit
to pitot head.

Instrument reads low.

Airspeed changesas
aircraft is banked.

NOTE
When any connections in static system are opened for
checking, system must be checked per F.A.R. 23.1325.
10-43. REMOVALAND REPLACEMENT. Refer to Paragraph 10-81 of this section.

Reissued: 1/15/81

3F12

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-44. MAGNETICCOMPASS.
10-45. GENERAL. The magnetic compass is a self-contained instrument. This instrument
has an individual light which is connected to the instrument lighting circuit. The compass
correction card is located in the card holder mounted on the instrument. The compass
should be swung wheneverinstruments or radios are changed and at least once a year.
10-46. ADJUSTMENTOF COMPASS.Before attempting to compensate compass, every
effort should be made to place the aircraft in simulated flight conditions; check to see that
the doors are closed, flaps in retracted position, engine running, throttle set at cruise
position and aircraft in level flight attitude. Aircraft master switch, alternator switch and all
radio switches should be in the ON position. All other cockpit controlled electrical switches
should be in the OFF position.
a. Set adjustment screws of compensator on zero. Zero position of adjusting screws
is when the dot of the screw is lined up with the dot of the frame.
b. Head aircraft on a magnetic North heading. Adjust N-S adjustment screw until
compass reads exactly North.
c. Head aircraft on a magnetic East heading and do the same as Step b, adjusting
E-Wadjusting screw.
d. Head aircraft on a magnetic South heading and note resulting South error. Adjust
N-S adjusting screw until one-half of this error has been removed.
e. Head aircraft on magnetic West and do same as Step d, adjusting E-Wadjustment
screw.
f. Head aircraft in successive.magnetic 30 degree headings and record compass
readings on appropriate deviation card. Deviations must not exceed ± 10° on any heading.

Reissued: 1/15/81

3F13

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-47. TROUBLESHOOTING.
TABLEX-VII. MAGNETICCOMPASS
Trouble

Cause

Remedy

Compassnot properly
compensated.

Compensate instrument.
(Refer to Paragraph
10-46.)

External magnetic
interference.

Locate magnetic interference and eliminate
if possible.

Excessivecard
oscillation.

Insufficient liquid.

Replace instrument.

Card sluggish.

Weak card magnet.

Replace instrument.

Excessivepivot friction or broken jewel.

Replace instrument.

Loose bezel screws.

Replace instrument.

Broken cover glass.

Replace instrument.

Defective sealing
gaskets.

Replace instrument.

Discolored markings.

Age.

Replace instrument.

Defectivelight.

Burned out lamp or
broken circuit.

Check lamp or continuity
of wiring.

Card sticks.

Altitude compensating
diaphragm collapsed.

Replace instrument.

Card does not move
when compensating
screwsare turned.

The gears that turn
compensatingmagnets
are stripped.

Replace instrument.

Compassswings
erratically when
radio transmitter
is keyed.

Normal.

Excessivecard error.

Liquid leakage.

Reissued: 1/15/81

3F14

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-48. MANIFOLDPRESSURE GAUGE.
10-49. GENERAL. The manifold pressure gauge is a vapor proof, absolute pressure type
instrument. Pressure from the intake manifold of the engine is transmitted to the instrument
through a line. A pointer indicates the manifold pressure availableat the engine in inches of
mercury.
10-50. TROUBLESHOOTING.
TABLE X-VIII. MANIFOLDPRESSURE INDICATOR
Cause

Trouble

Remedy

Excessiveerror at existing barometric pressure.

Pointer shifted.

Replace instruments.

Excessiveerror when
engine is running.

Line leaking.

Tighten line connections.

Sluggishor jerky
pointer movement.

Defectiveinstrument.

Replace instrument.

Dull or discolored
marking.

Age.

Replaceinstrument.

Incorrect reading.

Moisture or oil in
line.

Disconnect lines and
blow out.

10-51. REMOVALAND REPLACEMENT. (Refer to Paragraph 10-81 of this section.)
10-52. TACHOMETERINDICATOR.
10-53. GENERAL. The tachometer is connected to the engine accessory by a flexible cable
and provides an indication of crankshaft speed in revolutions per minute. The instrument
has a recording mechanism for recording the time that the engine is in actual operation.
NOTE
On PA-28-180 aircraft Serial Nos. 28-1761 to 28-3555,
28-3557 to 28-3572 and 28-3574 to 28-3626. The aircraft
tachometer must be placarded to show a red ARC between
2150 and 2350 RPM in accordance with the latest revision of
Piper Service Letter No. 526.
Propeller Limits: avoid continuous operation between 2150
and 2350 RPM.

Reissued: 1/15/81

3F15

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-54. TROUBLESHOOTING.
TABLEX-IX. TACHOMETER
Trouble

Cause

Remedy

Broken shaft.

Replace instrument.

Loose cable connections.

Tighten cable.

Rough spot on, or
sharp bend in shaft.

Repair or replace.

Excessivefriction in
instrument.

Replace instrument.

Indicator changesin
climb.

Excessiveclearance in
speed cup.

Replace instrument.

Pointer goes all the
way to stop, more
noticeable in cold
weather.

Excessivelubricant in
instruments.

Replace instruments.

Pointer jumps at idle.

Speed cup hitting rotating magnet.

Replace instrument.

Tachometer cable breaks.

Cable bent too sharply.

Reroute cable.

No reading on indicator, either permanent
or intermittent.

Pointer oscillates
excessively.

10-55. REMOVALAND REPLACEMENT. Refer to Paragraph 10-81of this section.
10-56. ENGINEOIL PRESSURE GAUGE.
10-57. GENERAL. The oil pressure gauge is mounted in the cluster on the instrument
panel. This gauge will indicate the amount of oil pressure available at the pressurized engine
oil passage.

Reissued: 1/15/81

3F16

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-58. TROUBLESHOOTING.
TABLEX-X. ENGINE OIL PRESSUREGAUGE
Trouble

Cause

Remedy

Excessiveerror at
zero.

Pointer loose on shaft.
Overpressureor
seasoning of bourdon
tube.

Replace instrument.

Excessivescale error.

Improper calibration
adjustment.

Replace instrument.

Excessivepointer
oscillation.

Air in line or rough
engine relief.

Disconnect line and
fill with light oil.
Check for leaks. If
trouble persists, clean
and adjust relief valve.

Sluggishoperation of
pointer or pressure
fails to build up.

Engine relief valve
open.

Clean and check.

10-59. REMOVALAND REPLACEMENT. Refer to Paragraph 10-83 of this section.
10-60. FUEL PRESSURE GAUGE.
10-61. GENERAL. The fuel pressure gauge instrument is mounted in the cluster on the
instrument panel. This gauge is connected to the fuel system at the carburetor fuel inlet
fitting.

Reissued: 1/15/81

3F17

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-62. TROUBLESHOOTING.
TABLEX-XI. FUEL PRESSUREGAUGE
Trouble

Cause

No fuel pressure
indication.

Fuel valve stuck.

Check valve.

No fuel in tanks.

Check fuel, fill.

Defective fuel pump.

Check pump for pressure build-up. Check
diaphragm and relief
valvesin engine pump.
Check for obstruction
in electric pump.
Check bypass valve.
Air leak in intake
lines.

Defectivegauge.

Replacegauge.

Obstruction in inlet
side of pump.

Trace lines and locate
obstruction.

Faulty bypass valve.

Replace.

Faulty diaphragm.

Replace or rebuild pump.

Surge dome on pump
filled with fuel.

Remove and empty.

Air in line.

Loosen line at gauge,
turn on electric pump.
Purge line of air and
retighten.

Fuel in line expanding
due to heat build up
in cowling.

Normal.

No fuel pressure
indication (cont).

Pressure low or
pressure surges.

Needle fluctuation.

High fuel pressure
with engine shut off
right after flight.

Reissued: 1/15/81

3F18

Remedy

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-63. REMOVALAND REPLACEMENT.Refer to Paragraph 10-79 of this section.
10-64. TURN AND BANKINDICATOR.
10-65. GENERAL. The turn and bank indicator can be either vacuum driven or electric.
The turn portion of the indicator is a gyroscope, while the bank portion of the indicator is a
ball sealed in a curved glass tube filled with damping fluid. There are two styles of this unit.
The first is the old style with a vertical needle in the center of the dial. This instrument
reads only the rate of turn, and unless the aircraft is turning, the needle will not move
regardless of bank angle. The other style is the turn coordinator which indicates both the
rate of turn and rate of roll.With this indicator, if the aircraft is rolled right and left rapidly,
the indicator will move, indicating a turn, but if the aircraft is held in a bank, and rudder is
applied, the indicator will come back to zero indicating no turn.
10-66. TROUBLESHOOTING.

TABLE X-XII. TURN AND BANK INDIATOR
Trouble

Cause

Remedy

Pointer fails to
respond.

Foreign matter lodged in
instrument.

Replace instrument.

Incorrect sensitivity.

Out of calibration.

Replace instrument.

Incorrect turn rate
(vacuum style).

High or low vacuum.

Check vacuum and adjust.

Filter dirty.

Replace filter.

Out of calibration.

Replace instrument.

Aircraft not in
coordinated turn.

Center ball in turn.

Ball sticky.

Flat spot on ball.

Replaceinstrument.

Ball not in center
when aircraft is
correctly trimmed.

Instrument not level
in panel.

Levelinstrument.

Instrument will not
run (electric).

No power to instrument.

Check circuit and repair.

Instrument malfunction.

Replace instrument.

Incorrect turn rate
(electric).

Reissued: 1/15/81

3F19

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-67. ELECTRICALINSTRUMENTS.
10-68. REMOVALAND REPLACEMENT.Refer to Paragraph 10-81 of this section.
10-69. FUEL QUANTITYINDICATOR.
10-70. GENERAL. The two fuel quantity gauges are mounted in the cluster on the
instrument panel. These instruments are calibrated in fractional divisions of one fourth, one
half, three fourths and full. A transmitter unit is installed in each fuel cell. This unit
contains a resistance strip and a movable control arm. The position of this arm is controlled
by a float in the fuel cell and this position is transmitted electrically to the indicator gauge
to show the amount of fuel in the cell.
10-71. TROUBLESHOOTING.
TABLE X-XIII. FUEL QUANTITYINDICATORS
Trouble
Fuel gauge fails to
indicate.

Cause

Remedy

Broken wiring.

Check and repair.

Gauge not operating.

Replace.

Blown fuse.

Replace fuse.

Fuel gauge indicates
empty when tanks are
full.

Incomplete ground.

Check ground connections
at fuel transmitter in
wings.

Fuel gaugeindicates
full with tanks empty.

Incomplete ground.

Check ground at instrument.

Float arm stuck.

Replace fuel transmitter.

Intermittent ground.

Check ground at transmitter and instrument.

Float arm sticky.

Replace fuel transmitter.

Fuel gaugeindicates
incorrectly.

Reissued: 1/15/81

3F20

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-72. REMOVALAND REPLACEMENT. Refer to Paragraph 10-83of this section.
10-73. OIL TEMPERATUREINDICATOR.
10-74. GENERAL. The oil temperature indicator is mounted in the instrument cluster on
the instrument panel. This instrument will provide a temperature indication of the engine oil
in degrees Fahrenheit. The instrument has a temperature bulb located in the oil screen
assembly,on the engine accessorysection.
10-75. TROUBLESHOOTING.
TABLE X-XIV. OIL TEMPERATUREINDICATORS
Cause

Trouble

Remedy

Instrument fails to
show any reading.

Broken or damaged bulb.
Wiringopen.

Check engine unit and
wiring to instrument.

Excessivescale error.

Improper calibration
adjustment.

Repair or replace.

Pointer fails to move
as engine is warmed up.

Broken or damaged bulb
or open wiring.

Check engine unit and
wiring.

Dull or discolored
marking.

Age.

Replaceinstrument.

10-76. REMOVALAND REPLACEMENT. Refer to Paragraph 10-83 of this section.
10-77. AMMETER.
10-78. GENERAL. The ammeter is mounted in the instrument cluster located on the
instrument panel. This instrument measures the output of the alternator into the entire
electrical system including the battery charging demand.
10-79. TROUBLESHOOTING.Refer to Section XI. (Alternator Section)
10-80. REMOVALAND REPLACEMENT. Refer to Paragraph 10-83of this section.
10-81. REMOVALAND REPLACEMENTOF FACE MOUNTEDINSTRUMENTS.

Reissued: 1/15/81

3F21

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-82. GENERAL. Since all instruments are mounted in a similar manner, a description of
a typical removal and installation is provided as a guide for the removal and installation of
the instruments. Special care should be taken when any operation pertaining to the
instruments is performed.
a. Remove the face panel by removing the screws from around the perimeter of the
panel.
b. With the face panel removed, the mounting screws for the individual instruments
will be exposed. Remove the connections to the instrument prior to removing the mounting
screwsof the instrument to be removed.
NOTE
Tag instrument connections for ease of installation.
c. Installation of the instruments will be completed by reversing the removal
instructions. After the installation is completed and before replacing the instrument face
panel, check all components for security and clearance of the control column.
10-83. REMOVALAND REPLACEMENTOF CLUSTER MOUNTEDINSTRUMENTS.
10-84. GENERAL. A cluster, located on the instrument panel, contains six individual
instruments. Removal of these instruments can be accomplished by the followingprocedure.
a. Remove the face panel by removing the screws from around the perimeter of the
panel.
b. With the face panel removed, the clear plastic cover on the cluster assemblywill be
exposed. Remove the coverand cluster by removing the six mounting screws.
c. Remove the connection to the individual instrument to be removed and remove the
instrument from the cluster assembly.
d. Replace the instruments by reversing the removal instructions. Check all
mountings and connections for security.
10-85. EXHAUSTGAS TEMPERATUREGAUGE. (ALCOR)
10-86..GENERAL. This instrument, which is commonly referred to as EGT, is used to aid
the pilot in selecting the economical fuel-air mixture for cruising flight at a power setting of
75% or less. It is a sensing device to monitor the fuel-air mixture leaving the engine
cylinders. This gauge is adjustable. If it is found defective after checking with
troubleshooting chart it should be replaced. If the leads to the gauge are defective in any
way they should be replaced. When replacing leads, it is very important to use the same
type and length of wire as the resistance of the leads is critical for the proper operation of
this gauge.

Reissued: 1/15/81

3F22

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-87. CLEANING AND INSPECTION. Unless mechanical damage is evident, broken
glass, bent or broken pointer, or broken case, the following checks should be performed
before removing the instrument.
a. Remove the probe from the exhaust stack and check for a broken weld (at tip
end) or a burnt off end. The measured resistance of probe should be .8 ohms. Clean the
connections with steel wool before reassembly.
b. Disconnect the lead wires at the instrument and measure. Resistance with the lead
wires connected to probe should be 3.3 ohms. Clean connections with steel wool before
reassembly.
c. With the leads connected to instrument, heat probe with propane torch to dull
red. The meter should read up to the fourth graduation or approximately 1500 °F. Before
making this check, make sure that the adjustment screw, located at the rear of the
instrument case, is in the center of its travel. If this screw has been turned to either end of
full travel, it will shut the instrument off and no indication will be shown on the pointer. If
meter still does not read, replace it.
CAUTION
Do not connect ohmmeter across meter. It will burn out
the movement of the meter.
10-88. TROUBLESHOOTING.

TABLE X-XV. EXHAUSTGAS TEMPERATUREGAUGE(ALCOR)
Trouble
Gauge inoperative.

Fluctuating reading.

Reissued: 1/15/81

Cause

Remedy

Defectivegauge,probe
or wiring.

Check probe and lead
wires for chafing,
breaks or shorting
between wires and/or
metal structure.

Adjusting potentiometer turned off scale.

Reset potentiometer.

Loose, frayed or broken
electricalleads or
faulty connections.

Clean and tighten
connections. Repair
or replace defective
leads.

3F23

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

C314

PROBE(SEENOTE)

LEFTSIDEVIEW

NOTE
.129 HOLE IN NO. 2 CYLINDEREXHAUST
STACK.REFER
TO TOPVIEWFORCORRECT
LOCATION.

Figure 10-19. EGT PROBE LOCATION (PA-28R-180 and 200)

5/81
Reissued: 1/15/81

3F24

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

C316

ENGINECENTERLINE

45°

TOPVIEW

EGT

2.00

NOTE
.129 HOLE IN NO. 2 CYLINDEREXHAUST
STACK.REFERTO TOPVIEW FORCORRECT
LOCATION.

Figure 10-20. EGT PROBE LOCATION (PA-28-235)

Reissued: 1/15/81

3G1

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

C315
8152

ENGINECENTERLINE

TOP VIEW

EGT PROBE (SEE NOTE)

LEFTSIDE VIEW

NOTE
.129 HOLE IN NO. 4 CYLINDEREXHAUST
OFENGINE.
STACKIN LINEWITHCENTERLINE

Figure 10-21. EGT PROBE LOCATION (PA-28-150/160/180) (S/N 1761 and up)

/15/81
Reissued: 1/15/81

3G2

INSTRUTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-89. CYLINDERHEADTEMPERATUREGAUGE.
10-90. GENERAL. The cylinder head temperature gaugeis in the instrument cluster on the
instrument panel. This instrument measures the cylinder head temperature using a sender
located in a cylinder head. The head location is determined by the engine manufacturer. It is
an electrical instrument and is wired through the instruments circuit breaker.
10-91. TROUBLESHOOTING.
TABLEX-XVI. CYLINDERHEADTEMPERATUREGAUGE
Trouble
Instrument shows no
indication.

Cause

Remedy

Power supply wire
broken.

Repair wire.

Defectiveinstrument.

Replace instrument.

Master switch off.
Instrument goes all
the way to upper stop.

Wirebroken between
sender and gauge.

Repair wire.

Defectivesender.

Replace sender.

10-92. REMOVALAND REPLACEMENT.Refer to Paragraph 10-83 of this section.
10-93. FUEL FLOWGAUGE.
10-94. GENERAL.The fuel flow gauge is a non-electric pressure gauge mounted in the
bottom half of the manifold pressure gauge. This gauge is located in the lower portion of the
instrument panel.
This instrument measures flow by reading the pressure drop across a fixed orifice
located in the fuel divider. When a constant fuel pressure is being supplied by the engine
driven pump, one can put a fixed orifice in the fuel divider head and measure the pressure
drop downstream of the orifice against a constant static pressure. This resultant pressurecan
be calibrated in gallons per hour flow. The constant static pressure is supplied by a vent line
running to the engine compartment. The vent line to the engine compartment automatically
compensates the instrument for altitude.

Reissued: 1/15/81

3G3

INSTRUMENTS

PIPER CHEROKEE SERVICE MANUAL

10-95..TROUBLESHOOTING.
TABLEX-XVII. FUEL FLOW GAUGE
Trouble

Cause

Remedy

Pointer oscillates.

Air in fuel line.

Purge line.

Gauge reads low at
altitude.

Vent line restricted.

Check line and fittings.

Pointer does not return
to zero.

Fuel in diaphragm of
gauge.

Replace gauge.

10-96. REMOVALAND REPLACEMENT. Refer to Paragraph 10-81of this section.
10-97. PIPER AUTOCONTROLSYSTEM. (See AutoControl ServiceManual)
10-98. ANNUNCIATORPANEL.
10-99. GENERAL. The annunciator panel consists of three amber lights and a push-button
test switch located on the upper left center portion of the instrument panel. (Refer to
Figure 10-4b.) The panel monitors alternator output, oil pressure and the vacuum system.
The ALT warning light will illuminate when alternator output is zero; the VAC light when
the pressure difference is below 3.5 in. Hg, and the OIL light when the oil pressure is below
35 psi. A test button is included to check the operation of the lights. This installation is
availableon 1975 models and up. (Refer to Section XI for serviceinformation.)
10-100.TROUBLESHOOTING.(Refer to Table XI-I.)
10-101. REMOVALAND REPLACEMENT.(Refer to paragraph 10-81.)

Reissued: 1/15/81

3G4

INSTRUMENTS

3G5

THRU

3L24

INTENTIONALLYLEFT BLANK

CHEROKEE

MANUAL
SERVICE
CARD
4 OF4
PA-28-140
PA-28-150
PA-28-160
PA-28-180
PA-28-235
PA-28R-180
PA-28R-200

CORPORATION
PIPERAIRCRAFT
(PART
NUMBER
753586)

4A1

PIPER CHEROKEE SERVICE MANUAL
AEROFICHE EXPLANATION AND REVISION STATUS
The Service Manual information incorporated in this set of Aerofiche cards has been arranged in
accordance with the general specifications of Aerofiche adopted by the General Aviation Manufacturer's
Association, (GAMA). The information compiled in this Aerofiche Service Manual will be kept current by
revisions distributed periodically. These revisions will supersede all previous revisionsand will be complete
Aerofiche card replacements and shall supersede Aerofiche cards of the same number in the set.
Conversion of Aerofiche alpha/numeric code numbers:
First number is the Aerofiche card number.
Letter is the horizontal line reference per card.
Second number is the vertical line reference per card.
Example: 2J16 = Aerofiche card number two of given set, Grid location J16.
To aid in locating the various chapters and related service information desired,the followingis provided:
A complete manual Table of Contents is for all fiche in this set.
A complete list of Illustrations is given and follows the Table of Contents.
A complete list of Tables is given for all fiche in this set and follows the list of Illustrations.
A complete list of paragraph titles and appropriate Grid location numbers is givenat the beginningof
each Chapter relating to the information within that Chapter.
5. Identification of Revised Material:
Revisedtext and illustrationsare indicated by a black vertical line along the left-hand margin of
frame,
opposite revised,added or deleted material. Revisionlines indicate only current revisions
the
with changesand additions to or deletions of existingtext and illustrations.Changesin capitalization,
spelling, punctuation, indexing, the physical location of the material or complete pageadditions are
not identified by revision lines.
6. Revisions to this Service Manual 753 586 issued August 16, 1972are as follows:
1.
2.
3.
4.

Effectivity

Publication Date

Aerofiche Card Effectivity

ORG720816
CR810115
PR810803
PR831003
PR840423
PR860115
IR860730
IR870506*

August 16, 1972
January 15, 1981
August 3, 1981
October 3, 1983
April 23, 1984
January 15, 1986
July 30, 1986
June 12,1987

1, 2, 3 and 4
1, 2, 3 and 4
1, 2, 3 and 4
1, 2, 3 and 4
1 and 3
1
1

This publication contains material revisedas of January 15, 1986(with two interim revisionseffectiveJuly
30, 1986and May 6, 1987).

* INTERIM CHANGE
Revisions appear in Table III-I and Table III-I of card 1.
There are no other changes included in this maintenance
manual.Pleasediscardyour currentcard 1 andreplaceit with
this revisedone. DO NOT DISCARD CARDS 2 3, or 4.

The date on Aerofiche cards should not be earlier than the date noted for the respectivecard effectivity.
Consult the latest card in this series for current Aerofiche card effectivity.

4A2

AIX
IIIX

IIX
8V

IX

8

X

8313

XI

8

VIIIA

IIIA
VIIA
IIA

IA
8V

A
Z'ON

S
9

A
III
I

6
'ON

N

S

I

PIPER CHEROKEESERVICEMANUAL

Figure
1 1-1.
11-2.
11-3.
1-4.
11-5.
11-6.
11-7.
11-8.
11-9.
1 -10.
11-11.
11-12.
11-13.
11-14.
11-15.
11-16.

11-17.

11-18.
11-19.
11-20.
11-21.
11-22.
11-23.
11-24.
11-25.
11-26.
11-27.
11-28.
11-29.
11-30.
11-31.
11-32.
11-33.
11-34.
11-35.
11-36.
11-37.
11-38.
11-39.

LISTOFILLUSTRATIONS
Generator and Starter System .........................
Generator WiringDiagram .............
Sectional View of Generator .............
Current/Voltage Regulator .............
Useof Riffler File to Clean Contact Points ..................
Voltage Regulator Air Gap ..........................
CheckingVoltage Setting Fixed Resistance Method .............
CheckingVoltage Setting Variable Resistance Method .....
Adjusting Voltage Regulator Setting .....
.....
Cutout Relay Air Gap Check and Adjustment ................
Cutout Relay Point Opening Check and Adjustment ............
CheckingCutout Relay Closing Voltage ...................
Adjustment of Cutout Relay Closing Voltage ................
CheckingCurrent Regulator, Load Method ..................
CheckingCurrent Regulator, Jumper Lead Method .............
Alternator and Starter System,
PA-28-140, SerialNos. 28-20000 to 28-24999 incl.:
PA-28-150,-160. Serial Nos. 28-508 to 28-3643 incl.:
PA-28-180,Serial Nos. 28-671 to 28-3643 incl.;
PA-28-235,Serial Nos. 28-10002 to 28-10762 incl. ...........
Alternator and Starter System,
PA-28-140,Serial Nos. 28-25000 and up;
PA-28-150.-160, -180, Serial Nos. 28-3644 and up;
PA-28-235 Serial Nos. 10763 and up and PA-28R ........
Lamp-BankLoad ................................
Checking Field Circuit .............................
Testing Field Circuit ...............................
Testing Rectifiers(Positive) ..........................
Testing Rectifiers(Negative) ..........................
C-3928 Fixtures and Adapters ........................
RemovingRectifiers ...............................
Installing Rectifiers ...............................
SolderingRectifier Lead ............................
Testing Stator Coils ...............................
RemovingEnd Bearing .............................
Installing End Bearing ..............................
RemovingDrive Pulley .............................
RemovingDrive End Bearing ..........................
RemovingSlip Ring . ............................
AligningSlip Ring ................................
Installing Slip Ring ...............................
Installing Retainer ................................
Solder Points ...................................
Installing Drive End Shieldand Bearing(Typical) ..............
InstallingPulley .................................
Meter Connections for Alternator Performance Test ............

4A4

Aerofiche
Grid No.
4A18
4A19
4A22
4B7
4B10
4B10
4B11
4B11
4B12
4B14
4B14
4B15
4B15
4B16
4B16

4B20

..

4B21
4B23
4B24
4B24
4C2
4C3
4C4
4C4
4C5
4C6
4C7
4C9
4C9
4C10
4C10
4C11
4C11
4C12
4C12
4C13
4C14
4C14
4C17

PIPER CHEROKEE SERVICE MANUAL

LIST OF ILLUSTRATIONS (cont.)
Figure
11-40.
11-41.
11-42.
11-43.
11-44.
11-45.
11-46.
11-47.
11-48.
11-49.
11-50.
11-51.
11-52.
11-53.
11-54.
thru
11-70.
11-71.
11-72.
11-73.
11-74.
11-75.
11-76.
11-77.
11-78.
11-79.
11-80.
11-81.
11-82.
11-83.
11-84.
11-85.
thru
11-143.
11-144.
12-1.
12-2.
12-3.
12-4.
12-5.
13-1.

13-2.
13-3.

Aerofiche
Grid No.
Voltage Regulator ......................................
......
Checking Air Gap ....................
.......................
Voltage Regulator Fusible Wires ...............................
Voltage Regulator Resistance Units .............................
No-Load Test Hookup ........................................
Lock Torque Test Hookup ...........
......................
Resistance Test Hookup .............................
..........
Exploded View of Gear Reduction Starting Motor ................
Turning Starting Motor Commutator ...........................
Testing Motor Armature for Shorts ...................
..........
Testing Motor Field for Grounds ...............................
No-Load Test Hookup ........................................
Stall Torque Hookup ..........................................
Terminal Block .............................................
For Index to these figures. see Table XI-I. Index
Electrical System Schematics

4C19
4C19
4C20
4C20
4D2
4D3
4D3
4D8
4D11
4D11
4D11
4D13
4D13
4F5

Exploded Viewof Alternator ..................................
Removal of Slip Ring End Bearing .............................
Removal of Rectifier..........................................
Removal of Drive End Head ...................................
Removal of End Head Bearing .................................
Testing Rotor for Ground .....................................
Testing Rotor for Shorts ......................................
Installation of Bearing ......................................
Installation of Rectifier........................................
Terminal Assembly ...........................................
Slip Ring End Bearing Assembly .......................
Testing Alternator ............................................
Brush Installation ...........................................
Internal Wiring Diagram ......................................
For Index to these figures. see Table XI-I. Index
Electrical System Schematics

4D20
4D21
4D21
4D22
4D22
4D23
4D23
4D24
4D24
4E I
4E2
4E2
4E3
4E3

..
........

Strobe Light Connections .....................................
Two Year. Magnesium Battery Connections......................
ELT Portable Folding Antenna ................................
ELT Using Fixed Aircraft Antenna .............................
Emergency Locater Transmitter Schematic (Narco) ...............
Communications Components ELT Schematic ...................
Cabin Heater. Defroster and Fresh Air System.
PA-28-140.Serial Nos. 28-2002to 28-24999incl..
and PA-28-150.-160. -180. Serial Nos. 28-1 to
28-1760incl ...........................................
Cabin Heater. Defroster and Fresh Air System.
PA-28-140.Serial Nos. 28-25000and up .....................
Cabin Heater. Defroster and Fresh Air System.
PA-28-150.-160. -180. Serial Nos. 28-1761to
28-2477inc ..............................................

Revised: 10/3 83

4A5

4A 12

4A 12
4E9
413
414
414
415
416

4117
4118
4119

PIPER CHEROKEESERVICE MANUAL

LIST OF ILLUSTRATIONS(cont.)
Aerofiche
Grid No.

Figure
13-4.
13-5.
13-6.
13-7.
13-8.
13-9.
13-10.
13-11.
14-1.
14-2.
14-3.
14-4.
14-5.
14-6.
14-7.
14-8.
14-9.
14-10.
14-11.
14-12.
14-13.
14-14.
14-15.

14-16.
14-17.

14-18.

Cabin Heater, Defroster and Fresh Air System,
PA-28-150,-160, -180, Serial Nos. 28-2478 to
28-4377 incl............. .......................
4120
Cabin Heater, Defroster and Fresh Air System,
PA-28-180,Serial Nos. 28-4378 and up
........
4121
Cabin Heater, Defroster and Fresh Air System.
PA-28-235.Serial Nos. 28-10003 to 28-10675 incl. ............
4122
Cabin Heater, Defroster and Fresh Air System.
PA-28-235,Serial Nos. 28-10676 to 28-1 1039 incl. ...........
4123
Cabin Heater. Defroster and Fresh Air System.
PA-28-235, Serial Nos. 28-11040 to 28-7210033 incl. ...........
4124
Cabin Heater. Defroster and Fresh Air System.
PA-28-235, Serial Nos. 28-7310001 and up ...............
4JI
Cabin Heater, Defroster and Fresh Air System.
PA-28R. ...................................
4J2
OverheadVent System ............
..............
....... ;4J3
Air Conditioning System Installation ....
.................
4J7
4J7
ServiceValves .................
.................
.. 4J12
Test Gaugeand ManifoldSet .........
........
·.........
..
4J13
ManifoldSet Operation ............
.................
4J14
U
Leak Test Hookup ...............
.................
4J15
Evacuation Hookup ..............
.................
.......
4J17
ChargingStand .................
...................
4J19
ChargingHookup .......
........
.................
4J21
Compressorand Fabricated Oil Dipstick . . .................
.. 4K1
Compressorand Alternator Belt Installation . ................
. 4K5
MagneticClutch ................
....
.. ............
4K7
Condenser Air Scoop Installation ......
.................
..4K11
Expansion Valve ................
.................
..4K13
Components Installation ...........
.................
4K15
Control Head - Diode Mounting Board, Diode Location and
Number, PA-28-140,Serial Nos. 28-7125472 to 28-7325057;
PA-28-180,Serial Nos. 28-7205092 to 28-7305071;
4K16
PA-28R-200. 28R-7235001 to 28R-7335057 ..............
Air Conditioning WiringSchematic.
PA-28-140,SerialNos. 28-7125472 thru 28-7225131 incl.;
4K18
PA-28-180,SerialNos. 28-7205092 thru 28-7205 44 incl ......
Air Conditioning WiringSchematic,
PA-28-140, SerialNos. 28-7225132 to 28-7225612;
PA-28-180, SerialNos. 28-7205145 to 28-7205328;
4K19
PA-28R-200,Serial Nos. 28R-7235001 to 28R-7235330 .......
Air Conditioning WiringSchematic,
PA-28-140, SerialNos. 28-7325001 and up;
PA-28-180, SerialNos. 28-7305001 and up;
PA-28R-200,Serial Nos. 28-7335001 and up ..............
4K20

Revised: 10/3/83

4A6

PIPERCHEROKEESERVICEMANUAL

LIST
OFTABLES
Aerofiche
Grid No.

Table
XI-I.
XI-II.
XI-III.
XI-IV.
XI-V.
XIV-I.
XIV-II.
XIV-III.
XIV-IV.
XIV-V.

Revised: 10/3/83

Electrical System Schematic Index ..................
Electrical System Troubleshooting ..................
Electrical System Component Loads .................
Electrical Symbols ............................
ElectricalWireCoding ..........................
Temperature PressureChart .......................
AluminumTubing Torque .......................
CompressorOil Change .........................
Air Conditioning System Troubleshooting ..............
Blower System WireColor Codes ...................

4A7

4A12
4E10
4F8
4F9
4F10
4J8
4J11
4J24
4K21
4L6

SECTION
XI
ELECTRICAL
SYSTEM

Aerofiche
Grid No.
11-1.

11-2.
11-3.
11-4.

11-23.

Introduction ...................................
4A17
Description
........................
...
..
4A17
Troubleshooting .................................
4A17
Generator System (Delco-Remy) .......................
4A20
11-5.
Description of Generator System .................
4A20
11-6.
CheckingGenerator System ...................
4A20
11-7.
Adjustments,Tests and Maintenanceof
Generator System ........................
4A21
11-8.
Test and Maintenanceof Generator (Delco-Remy) .......
4A22
11-9.
Inspection of Generator .......................
4A22
11-10. Shunt Generator Output ......................
4A23
11-11. Check DefectiveGenerators ....................
4A24
11-12. No Output .........................
4A24
11-13. Unsteady or Low Output .
..
..................
..
4B1
11-14. ExcessiveOutput ..........................
4B2
11-15. NoisyGenerator ...........................
4B2
11-16. Disassembly,Repair and Reassembly ...............
4B3
11-17. Field Coil Removal ............
4B3
11-18. Inspection and Repair of Parts ...................
4B3
11-19. Field Coil Service .............
4B3
11-20. Armature Service ..........................
4B4
11-21. PolarizingGenerator .........................
4B4
11-22. Generator ServiceTest Specifications (Delco-Remy) ......
4B5
Regulatorr (Delco-Remy)
................ 4B6
11-24. Description of Regulator .......
................ 4B6
11-25. Cutout Relay ..............
·.....
........... 4B6
11-26. Voltage Regulator ...........
...............
4B7
11-27. Current Regulator ...........
...............
4B8
11-28. Resistances ..............
...............
4B8
11-29. Temperature Compensation .....
...............
4B9
11-30. Regulator Polarity ...........
...............
4B9
11-31. Regulator Maintenance ........
........... ....
..
4B9
11-32. Maintenance Instructions .......
...............
4B9
11-33. CleaningContact Points ........
............... .4B10
11-34. Regulator Checks and Adjustments ...............
4B11
11-35. Voltage Regulator ...........
............
4B11

Revised: 10/3/83

............

4A8

Aerofiche
Grid No.

11-44.

11-71.

11-75.
11-77.
11-79.
11-80.

4B14
4B15
4B17
4B17
4B17
4B17
4B17
4B18
4B19
4B19
4B22
4B24
4B24

11-36. Cutout Relay ...........................
11-37. Current Regulator ..........................
11-38. Repairs ................................
11-39. Regulator Spring Replacement ...
............
.
11-40. Radio By-PassCondensers .....................
11-41. Regulator Armature Replacement ....
............
11-42. High Points on Regulator Performance and Checks .......
11-43. Regulator ServiceTest Specifications (Delco-Remy) ......
Alternator System (Chrysler) .........................
11-45. Description of Alternator System .................
11-46. Alternator System Test Procedure .................
11-47. Bench TestingAlternator ......................
11-48. Field Current Draw .........................
11-49. Testing Alternator Internal Field Circuit For
A Ground ............................
11-50. Inspection ..............................
11-51. Testing Rectifiers(Positive) ....................
11-52. Testing Rectifiers(Negative) ....................
11-53. Removingand Installing Rectifiers ................
11-54. RemovingRectifiers .........................
11-55. Installing Rectifiers .........................
11-56. Testing Stator Coils for Ground ..................
11-57. Testing Alternator Capacitors ...................
11-58. RemovingNeedleBearing From End Shield ...........
11-59. InstallingNeedle Bearingin End Shield ..............
11-60. RemovingDrive Pulley .......................
11-61. RemovingDrive End Bearing ....................
11-62. ReplacingSlip Rings .........................
11-63. RemovingSlip Rings ........................
11-64. Installation of Slip Rings ......................
11-65. InstallingGrease Retainer ......................
11-66. Installing Drive End Bearing ....................
11-67. InstallingPulley ...........................
11-68. AssemblingEnd Shield Sub-Assemblies ..............
11-69. Bench Run-up Test .........................
11-70. Bench Hot Stabilation Output Test ................
Voltage Regulator Servicing(Chrysler) ....................
11-72. Air Gap Adjustment .........................
11-73. Contact ClearanceAdjustment ...................
11-74. Voltage Regulator Fusible WireReplacement
Voltage Regulator (Wico) ..................
11-76. CheckingVoltage Regulator ..........
Over Voltage Relay (Wico) .................
11-78. CheckingOver Voltage Relay .........
Checking Generator or Alternator BeltTension .....
Starting Motor (Delco-Remy) ...............
11-81. Operation of Starting Motor ..........
11-82. Checking Starting Motor ............
.

.

Revised: 10/3/83

4A9

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.

.

.

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.

.

.

.

.

. .

.

.

.

.

.

.

. .

. .

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

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.

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.

. .

.

4C1
4C1
4C1
4C3
4C4
4C5
4C5
4C8
4C8
4C9
4C9
4C10
4C10
4C11
4C12
4C12
4C15
4C15
4C15
4C16
4C16
4C18
4C19
4C19
4C20
4C21
4C21
4C21
4C22
4C22
4C23
4C24
4C24
4D1

Aerofiche
Grid No.
............
11-83. Test and Maintenanceof Starting Motors .
.................
11-84. Inspection .............
..........
11-85. No Load Test ...................
.
.....
..............
11-86. Lock-Torque Test ......
.
.....
....
11-87. Resistance Test ..........
11-88. Disassembly ..............................
...............
11-89. Component Inspection and Repair .
11-90. Assembly ...............................
11-91. Starting Motor ServiceTest Specification (Delco Remy) ....
.
.....................
11-92. Starting Motors (Prestolite) .....
11-93. Description ..............................
11-94. Operation ...............................
...........
11-95. Maintenance ...........
11-96. Overhaul ...............................
........................
11-97. Removal .......
.....
. ..
11-98. Disassembly ...............
...
...... ...
11-99. Brushes ...................
........................
11-100. Armature ....
...........
.............
11-101. Field Coils ...
........
11-102. Brush Holders ......................
11-103. Gear and Pinion Housing ......................
.......
11-104. Bendix Drive ..................
................
11-105. Assembly ................
11-106. BenchTests .......
...........
.
11-107. Starting Motor Control Circuit
11-108. Starting Motor ServiceTest Specification (Prestolite) ......
.................................
.....
11-109. Battery
11-110. ServicingBattery ...........................
11-111. Removalof Battery .........................
.....
11-112. Installation of Battery ...................
11-113. ChargingBattery ................................
...................
11-114. Battery Box Corrosion Prevention .
11-115. Starting Through External Power .
...................
..............
11-116 Alternator System (Prestolite) ........
11-117. CheckingAlternator System ....................
.
11-118. Alternator Nomenclature ........
.
.................
11-119. Alternator ServicePrecautions .
.............
11-120. Description of Alternator .........
.
............
11-121. Overhaulof Alternator ..........
....
....... ........
11-122. Disassemblyof Alternator .
....
11-123. Inspection and Testing of Components .........
11-124. Assemblyof Alternator .......................
11-125. Testing of Alternator ........................
.
11-126. Alternator ServiceTest Specifications (Prestolite) .......
....................
11-127. CheckingAlternator Belt Tension .
..
.
.......
11-128. Instrument and Panel Lights .........
............
11-129.. Removalof Dimmer Control Assembly ...
11-130. Installation of Dimmer Control Assembly ............

Revised: 10/3/83

4A10

4D2
4D2
4D2
4D3
4D4
4D4
4D5
4D6
4D6
4D7
4D7
4D7
4D7
4D10
4D10
4D10
4D11
4D11
4D12
4D12
4D12
4D12
4D12
4D13
4D14
4D14
4D15
4D15
4D15
4D15
4D16
4D16
4D17
4D18
4D18
4D19
4D19
4D 19
4D20
4D21
4D22
4D24
4E1
4E2
4E3
4E3
4E3
4E3

Aerofiche
Grid No.
11-131. Annunciator Panel ................................
11-132. Description ..............................
11-133. Removalof Oil PressureSensor ..................
11-134. Installation of Oil PressureSensor .................
11-135. Removalof Vacuum Sensor .
...............
11-136. Installation of Vacuum Sensor ...................
11-137. Anti-CollisionLight (Rotating Beacon) ...................
11-138. Removal ..........................
11-139. Installation .............................
11-140. Anti-CollisionLight (Strobe) ..........................
11-141. Description ................
11-142. Removalof WingTip Strobe Light ................
11-143. Installation of WingTip Strobe Light ..............
11-144. Removalof Fin Tip Strobe Light
.
......
...
11-145. Installation of Fin Tip Strobe Light
.
..........
11-146. Removalof Strobe Power Supply
.
...........
11-147. Installation of Strobe Power Supply .........
.......
11-148. TroubleshootingProcedure
.
............

Reissued: 1/15/81

4A11

4E4
4E4
4E4
4E4
. 4E4
4E5
4E5
4E5
4E5
4E5
4E5
4E5
4E6
4E6
4E6
4E6
4E7
4E7

TABLE XI-I. INDEX - ELECTRICAL SYSTEM SCHEMATICS

System
Electrical System Schematic, PA-28-140, Serial Nos. 28-20000to
28-24999incl .............................................
Electrical System Schematic, PA-28-140, Serial Nos. 28-25000to
28-7325052incl ...........................................
Electrical System Schematic, PA-28-150,-160, Serial Nos. 28-1
to 28-507 incl. ...........................................
Electrical System Schematic, PA-28-150,-160, Serial Nos. 28-508
to 28-670 incl. ...........................................
Electrical System Schematic, PA-28-150,-160, -180, Serial Nos.
28-671to 28-1760incl. ................
...............
Electrical System Schematic, PA-28-150,-160, -180, Serial Nos.
28-1761to 28-3643incl......................................
Electrical System Schematic, PA-28-150,-160,-180, Serial Nos.
28-3644to 28-4377incl...................................
Electrical System Schematic, PA-28-180,Serial Nos. 28-4378
to 28-5227incl ..........................................
Electrical System Schematic, PA-28-180, Serial Nos. 28-5228
to 28-7305063incl. .......................................
Electrical System Schematic, PA-28-235, Serial Nos. 28-10003
to 28-10719incl. .........................................
Electrical System Schematic, PA-28-235, Serial Nos. 28-10720
to 28-10762incl. .........................................
Electrical System Schematic, PA-28-235, Serial Nos. 28-10763
to 28-11039incl. ........................................
Electrical System Schematic, PA-28-235, Serial Nos. 28-11040
to 28-7310038incl. .......................................
Electrical System Schematic, PA-28R-180, Serial Nos. 28-30005
to 28-30879incl. .........................................
Electrical System Schematic, PA-28R-180, -200, Serial Nos.
28-30880to 28-7335054incl ...............................
Landing Gear Back-up Actuator Override Mechanism ...........
Landing Gear Back-up Actuator Override Mechanism ..........
See Note on Grid No.....................................
A/C Air Blower, PA-28-140, Serial Nos. 28-7425001& up;
PA-28R-200, Serial Nos. 28-7435001& up;
PA-28-235, Serial Nos. 28-7410001& up;
PA-28-180, Serial Nos. 28-7405001& up ....................
Alternator, Starter, Cabin Light, Cigar Lighter and
External Power Receptacle, PA-28-140, Serial Nos. 28-25000
to 28-7325052incl. .....................................
Alternator, Starter, Cabin Light, Cigar Lighter and
External Power Receptacle, PA-28-140, Serial Nos.
28-7325053to 28-7425454incl. ...........................

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4A12

Figure

Aerofiche
Grid No.

11-54

4F11

11-55

4F13

11-56

4F15

11-57

4F17

11-58

4F19

11-59

4F21

11-60

4F23

11-61

4GI

11-62

4G3

11-63

4G5

11-64

4G7

11-65

4G9

11-66

4G11

11-67

4G13

11-68
11-69
11-70

4G15
4G17
4G 17
4G19

11-107

4H10

11-85
11-86

.

oo

00

I0

0

6
0

I

4

~~~
.

TABLE XI-I. INDEX - ELECTRICAL SYSTEM SCHEMATICS (cont)

Figure

System

Stall Warning, PA-28-140, Serial Nos. 28-7625001& up;
PA-28R-200, Serial Nos. 28-7635001& up; PA-28-235,Serial Nos.
11-138
28-7610001& up .........................................
11-121
Turn & Bank, PA-28-140,Serial Nos. 28-7325053& up .........
Turn & Bank, PA-28-180,Serial Nos. 28-7405001& up;
11-122
............
PA-28-235, Serial Nos. 28-7410001& up ........
11-123
Turn & Bank, PA-28R-200, Serial Nos. 28-7335055& up........

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4A16

Aerofiche
Grid No.

4H23
4H 14
4H 14
4H 14

PIPER CHEROKEE SERVICE MANUAL

SECTIONXI
ELECTRICALSYSTEM
11-1. INTRODUCTION.This section contains instructions for correcting difficulties which
may arise in the operation of the electrical system in PA-28 series airplanes. It includes a
general description and function of each part of the system along with test and adjustments
of the various components. This does not include any electronics installations such as
Autopilot or radios. For Autopilot ServiceInformation, refer to Section XII of this manual.
Radio Service and Repairs may be found in the appropriate radio manufacturer's manuals.
11-2. DESCRIPTION. The electrical system is a 14-volt, direct current, single wire,
negative ground system. All electrical equipment is grounded to the metal structure of the
airplane, therefore, the structure takes the place of the second wire. A 12-volt battery is
incorporated in the system to furnish power for starting and as a reserve power source in
case of generator or alternator failure. The battery and generator or alternator are both
connected to the bus bar, from which all electrical equipment is powered, with the
exception of the starter which receives its power from the load side of the battery. The
master switch controls the battery relay and field circuit. The master switch must be on
before any electrical equipment will operate. The airplane can be equipped with standard
navigationlights, rotating beacon and one landing light located in the nose cowl.
11-3. TROUBLESHOOTING.Troubles peculiar to the electrical system are listed in Table
XI-I at the back of this section along with their probable causes and suggestedremedies. The
wiring diagrams included at the end of this section will give physical breakdown of the
different electrical circuits used in this airplane.
After the trouble has been corrected, check the entire electrical system for security and
operation of its components.
WARNING
All checks and adjustments of the generator or alternator
and/or its components should be made with the engine
stopped. Therefore, to complete some checks or adjustments,
it will be necessary to remove these units from the airplane
and place on a test stand.

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C317

NOTE
THIS
IS
A
TYPICAL
WIRING
DIAGRAM
FOR
GENERAL
REFERENCE ONLY. FOR DETAILED
SCHEMATIC, SEE TABLE XI-I.

VOLTAGE
REGULATOR
BAT

F

GENERATOR

CIRCUITPROTECTOR
35AMP

T

T
-

-

SHIE

i

MASTER
I

MASTERSWITCH

. .CONTACTOR

_

BATTERY

AMMETER

SELINOID

TO BUSBAR

STARTER
SWITCH

Figure11-1. Generatorand Starter System(Typical)

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4A18

STEM
ELECTRICAL SYSTEM

PIPER CHEROKEE SERVICE MANUAL

A143

NOTE
THIS
IS A TYPICAL
WIRING
DIAGRAM
FOR
GENERAL
REFERENCE ONLY. FOR DETAILED
SCHEMATIC, SEE TABLE XI-I.

REGULATOR

I

I

I

BAT.

GEN.

F

"A"

A

BATTERY

LOAD
GENERATOR

Figure 11-2. Generator WiringDiagram(Typical)

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PIPER CHEROKEE SERVICE MANUAL

11-4.

GENERATOR SYSTEM .(Delco-Remy.)

11-5. DESCRIPTION OF GENERATOR SYSTEM. The generator is of the two
brush, shunt type and is controlled by a regulator operating on the principal of
inserting resistance into the generator field circuit to cause a reduction of generator voltage and current output. With each generator is the regulator assembly, composed of a voltage regulatorand current regulator, to prevent overloading of the battery and electrical circuits.
Also with the regulator is a reverse
current cutout to prevent the generator from beingmotorized by the battery when
the generator output drops below the battery voltage. Field current between the
regulator and generator maybe broken through the use of the master switch. The
generator is located on the front lower right side of the engine and utilizes a belt
drive from the engine crankshaft. The generator voltage regulator is located on
the engine firewall. The best assurance of obtaining maximum service from the
generator with minimum trouble is to follow a regular inspection and maintenance
procedure.
11-6. CHECKING GENERATOR SYSTEM. Inanalyzingcomplaints of generatorregulator operation, any of several basic conditions may be found.
a. Fully Charged Battery and Low Charging Rate: This indicates normalgenerator-regulator
operation. Regulator settingmay be checked as outlined inparagraph 11-23.
b. Fully Charged Batteryand a HighChargingRate: This indicatesthatthevoltage regulator is not reducing the generator output as it should. A high charging
rate to a fully charged battery will damage the battery and the accompanying high
voltage is very injurious to all electrical units.
This operating condition may result from:
1. Improper voltage regulator setting.
2. Defective voltage regulator unit.
3. Grounded generator fieldcircuit (in eithergenerator,
regulatoror wiring).
4. Poor ground connection at regulator.
5. High temperature which reduces the resistance of the battery to charge
so that it will accept a high charging rate even though the voltage regulator setting is normal.
If the trouble is not due to high temperature, determine the cause of trouble
bydisconnecting the lead from the regulator "F" terminal with the generator operating at medium speed. If the output remains high, the generator field i s ground ed either in the generator or in the wiring harness. If the output drops off, the
regulatoris at fault, and it should be checked for a high voltage settingorgrounds.

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c. Low Battery and High Charging Rate: This is normal generator-regulator
action. Regulator settings may be checked as outlined in paragraph 11-23.
d. Low Battery and Low or No Charging Rate: This condition could be due to:
1. Loose connections, frayed or damaged wires.
2. Defective battery.
3. High circuit resistance.
4. Low regulator setting.
5. Oxidized regulator contact points.
6. Defects within the generator.
If the condition is not caused by loose connections, frayed or damaged wires,
proceed as follows to locate cause of trouble.
To determine whether the generator or regulator is at fault, momentarily
ground the "F" terminal of the regulator and increase generator speed. If the
output does not increase, the generator is probably at fault and it should be check ed as outlined in paragraph 11-8. If the generator output increases, the trouble
is due to:
1. A low voltage (or current) regulator setting.
2. Oxidized regulator contactpointswhich insert excessive resistance into
the generator field circuit so that output remains low.
3. Generator field circuit open within the regulator at the connections or
in the regulator wiring.
e. Burned Resistances, Windings or Contacts: These result from open circuit
operation or high resistance in the charging circuit. Where burned resistances,
windings or contacts are found, always check wiring before installing a new regulator. Otherwise the new regulator may also fail in the same way.
f. Burned Relay Contact Points: This is due to reversed generator polarity.
Generator polarity must be corrected as explained in paragraph 11-21 after any
checks of the regulator or generator or after disconnecting and reconnecting leads.
11-7. ADJUSTMENTS, TESTS AND MAINTENANCE OF GENERATOR SYSTEM.
The best assurance of obtaining maximum service from generators with
minimum trouble is to follow a regular inspection and maintenance procedure.
Periodic lubrication where required, inspection of the brushes and commutator
and checking of the brush spring tension are essentials in the inspection procedure. In addition, disassembly and thorough overhauling of the generator at periodic intervals are desirable as a safeguard against failures from accummulations of dust and grease and normal wear of parts. This is particularly desirable on installations where maintenance of operating schedules is of special importance. In addition to the generator itself, the external circuits between the
generator, regulator and battery must be kept in good condition since defective
wiring or loose or corroded connections will prevent normal generator and reg-

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C359

BLASTTUBE
COMMUTATOR
TERMINALS

01

I

FIELD
DRIVE END FRAME
Figure 11-3.

COMMUTATOR
END FRAME

COIL

Sectional View of Generator

ulator action. At times it maybe found necessary to adjust the voltage regulator.
More detailed inspection and overhaul instructions may be found in the paragraphs
to follow.
11-8.

TEST AND MAINTENANCE OF GENERATOR (Delco-Remy).

11-9. INSPECTION OF GENERATOR.
a. At periodic intervals the generator should be inspected to determine its condition. The frequency with which this should be done will be determined by the
type of service in which it is used. High speed operation, excessive dust or dirt,
high temperatures and operating the generator at or near full output most of the
time are all factors which increase bearing, commutator, and brush wear. Generally speaking, the units should be inspected at approximately 100 hour intervals.

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The inspection procedure follows.
b. First inspect the terminals, external connections and wiring, mounting,
pulley and belt. Then remove the cover band so that the commutator, brushes
and internal connections can be inspected. If the commutator is dirty it may be
cleaned with a strip of No. 00 sandpaper. Never use emery cloth to clean the
commutator.
c. The sandpaper may be used byholding it against the commutatorwith a wood
stick while the generator is rotated, moving it backand forth across the commutator. Gum and dirt will be sanded off in a few seconds. All dust should be blown
from the generator after the commutator has been cleaned. A brush seating stone
can also be used to clean the commutator.
d. If the commutator is rough, out of round, or has high mica, the generator
must be removed and disassembled so that the armature can be turned down in a
lathe and the mica undercut.
e. If the brushes are worn down to less than half their original length, they
should be replaced. Compare the old brush with anewone todetermine howmuch
it is worn. New brushes should be seated to make sure that they are in good contact with the commutator. A convenient tool for seating brushes is a brush seat ing or bedding stone. This is a soft abrasive material which, when held against
a revolving commutator, disintegrates so that particles are carried under the
brushes and wear their contacting faces to the contour of the commutator in a few
seconds. All dust should be blown fromthegeneratorafter
the brushes are seated.
f. The brush spring tension must be correct since excessive tension will cause
rapid brush and commutator wear, while low tension causes arcing and burning
of the brushes and commutator. Brush springtension can be checked with a spring
gauge hooked on the brusharm or brush attaching screw. Correction can be made
by bending the brush spring as required. If the brush spring shows evidence of
overheating (blued or burned), do not attempt to readjust it, but install a new
spring. Overheating will cause a spring to lose its temper.
g. The belt should bechecked to make sure that it is in good condition and has
correct tension. Low belt tensionwill permit belt slippagewith a resulting rapid
belt wear and low or erratic generator output. Excessive belt tension will cause
rapid belt and bearing wear. Check the tension of a new belt 25 hours after installation. Proper adjustment is given in paragraph 11-79.
11-10. SHUNT GENERATOR OUTPUT. Themaximumoutputofshuntgenerators
is determined by the current setting of the current regulator with which the shunt
generator is used. Checking of this setting is discussed in the applicable regulator bulletin.

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11-11. CHECKING DEFECTIVE GENERATORS. If the generator-regulator
system does not perform according to specifications (generator does not produce
rated output or produces excessive output), and the trouble has been isolated in
the generator itself by following the procedure outlined in paragraph 11-6, the
generator may be checked further as follows to determine the location of trouble
in the generator.

11-12 NO OUTPUT.
a. If the generator will not produce any output, remove the cover band and
check the commutator, brushes and internal connections. Sticking brushes, a
dirty or gummycommutator (Refer to paragraph 11-20.)orpoor connections may
prevent the generator from producing any output. Thrown solder on the cover
band indicates that the generator has been overloaded (allowed to produce excessive output) so it has overheated and melted the solder at the commutator riser
bars. Solder thrown out often leads to an open circuit and burned commutator
bars. If the brushes are satisfactorily seated and are making good contact with
the commutator, and the cause of trouble is not apparent, use a set of test points
and a test lamp as follows to locate the trouble (leads must be disconnected from
generator terminals).
b. Raise the grounded brush from the commutator and insulate with a piece of
cardboard. Check for grounds with test points from the generator main brush to
the generator frame. If the lamp lights, it indicates that the generator is internally grounded. Location of the ground can be found by raising and insulating all
brushes from the commutator and checking the brush holders, armature, commutator and field separately.
Repair or replace defective parts as required.
(Refer to paragraph 11-18.)
NOTE
If a grounded field is found, check the regulator contact points, since a grounded field may have permitted an excessive field current which will have burned
the regulator contact points. Burned regulator points
should be cleaned or replaced as required.
c. If the generator is not grounded, check the field for an open circuit with a
test lamp. The lamp should light when one test point is placed on the field terminal or grounded field lead and the other is placed on the brush holder to which
the field is connected. If it does not light, the circuit is open. If the open is due
to a broken lead or bad connection, it can be repaired, but if the open is inside
one of the field coils, it must be replaced.

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PIPER CHEROKEE SERVICE MANUAL

d. If the field is not open, check for a short circuit in the field by connecting
a battery of the specified voltage and an ammeter in series with the field circuit.
Proceed with care, since a shorted field may draw excessive current which might
damage the ammeter. If the field is not within specification, new field coils will
(Refer to Paragraph 11-16.)
be required.
NOTE
If a shorted field is found, check the regulator contact
points, since a shorted field may have permitted excessive field current whichwould have caused the regulator contact points to burn. Clean or replace points
as required.
e. If the trouble has not yet been located, check the armature for open and
obvious, since the open
short circuits. Open circuits in the armatureareusually
circuited commutator bars will arc every time they pass under the generator
brushes so that they will soon become burned. If the bars are not too badly burned and the open circuit can be repaired, the armature can usually be saved. In
addition to repairing the armature, generator output must be brought down to
specifications to prevent overloading by readjustment of the regulator.
f. Short circuits in the armature are located by use of a growler. The armature is placed in the growler and slowly rotated (while a thin strip of steel such
as a hacksaw blade is held above the armature core). The steel strip will vibrate
above the area of the armature core in which short circuited armature coils are
located. If the short circuit is obvious, it can often be repaired so that the armature can be saved.
11-13. UNSTEADY OR LOW OUTPUT. If the generator produces a low or unsteady output, the following factors should be considered:
a. A loose drive belt will slip and cause a low or unsteady output.
b. Brushes which stick in their holders, or low brushspring tension will prevent good contact between the brushes and commutator so that output will be low
and unsteady. This will also cause arcing and burning of the brushes and commutator.
c. If the commutator is dirty, out of round, or has high mica, generator output is apt to be low and unsteady. The remedy here is to turn the commutator
down in a lathe and undercut the mica. Burned commutator bars may indicate an
open circuit condition in the armature as already stated above. (Refer to Paragraph 11-12.)

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11-14. EXCESSIVE OUTPUT.
a. When a generator produces excessive output on an application, the procedure for determining whether the trouble is in the generator, regulator, or elsewhere is outlined in paragraph 11-6. If the generator output remains high, even
with the "F" terminal lead disconnected, then the trouble is in the generator itself, and it must be further analyzed to locate the source of trouble.
b. In the systemwhich has thegenerator fieldcircuit groundedexternally, accidental internal grounding of the field circuit would prevent normal regulation so
that excessive output might be produced by the generator.
On this type of unit,
an internally grounded field which would cause excessive output may be located
by use of test points connected between the "F" terminal and thegenerator frame.
Leads should be disconnected from the "F" terminal and the brush to which the
field lead is connected inside the generator should be raised from the commutator before this test is made. If the lamp lights, the field is internallygrounded.
.If the field has.become grounded because the insulation on a field lead has worn
away, repair can be made by reinsulating the lead. It is also possible to make
repair where the ground has occurred at the pole shoes by removing the field coils
and reinsulating and reinstalling them. A ground at the "F" terminal stud can be
repaired by installing new insulating washers or bushings.
NOTE
If battery temperature is excessive, battery overcharge is apt to occur, even though regulator settings
are normal. Under this condition, it is permissible
to reduce the voltage regulator setting as explained in
the applicable bulletin pertaining to the regulator used
on the application.

11-15. NOISY GENERATOR. Noise emanating from agenerator may be caused
by a loose mounting, drive pulley, or gear; worn or dirty bearings: or improperly seated brushes. Dirty bearings may sometimes be saved by cleaning and
relubrication, but worn bearings should be replaced. Brushes can be seated as
explained in paragraph 11-9. If the brush holder is bent, it may be difficult to
reseat the brush so that it will function properly without excessive noise. Such
a brush holder will require replacement.

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PIPER CHEROKEE SERVICE MANUAL

11-16. DISASSEMBLY, REPAIR AND REASSEMBLY. Normally, disassembly
should proceed only so far as is necessary to make repair or replacement of the
defective parts. For example, the field coils should be checked for opens, shorts,
or grounds before being removed from the field frame. They should be removed
only if they require repair or replacement.
11-17. FIELD COIL REMOVAL. Fieldcoilscanbe removedfromthefieldframe
most easily by use of a pole shoe screw driver. It is also advisable to use a pole
shoe spreader, since this prevents distortion of the field frame. The pole shoe
screw driver permits easy loosening and removal of the pole shoe screws so that
the pole shoes and field coils can be taken out of the field frame. The pole shoe
sc rew driver and spreader should be used on reassembly of the field frame. Ca re ful reassembly is necessary to prevent shorting orgrounding of the field coils as
the pole shoes are tightened into place.
11-18. INSPECTIONAND REPAIR OF PARTS. The armature or field should not
be cleaned in any degreasing tank or by use of degreasing compounds, since this
might damage insulation so that a short or ground would subsequently develop.
Sealed ball bearings do not require cleaning or relubrication. Other generator
parts should be cleaned and carefully inspected for wear and other damage. Any
defective parts should be repaired or replaced. On reassembly all soldered elec trical connections should be made with rosin flux. Acid flux must never be used
on electrical connections.
11-19. FIELD COIL SERVICE.
a. The field coils should be checked for grounds, opens or shorts as already
explained in paragraph 11-12.
b. Grounded field coils may sometimes be repaired by removing them so they
can be reinsulated. Care must be used to avoid excessive bulkiness when applying new insulation, since this might cause the pole shoe to cut through and
cause another ground when the coils are reinstalled.
c. Usually if a field coil is open or shorted internally it will require replacement, since it is difficult to repair such a defect.
d. To remove or replace field coils in the field frame, the use of a pole shoe
spreader and screw driver is recommended.

ELECTRICAL SYSTEM

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4B3

PIPER CHEROKEE SERVICE MANUAL

11-20. ARMATURE SERVICE.
a. The armature should be checked for opens, shorts and grounds as explained
in followingparagraphs. If the armature commutator is worn, dirty, out of round,
or has high mica, the armature should be put in a lathe so the commutator can be
turned down and the mica undercut. The mica should be undercut .031 of an inch
and the slots cleaned out carefully to remove any trace of dirt or copper dust. As
a final step in this procedure, the commutator should be sanded lightly with No.
00 sandpaper to remove any slight burrs that might be left as a result of the undercutting procedure.
b. Open circuited armatures can often be saved when the open is obvious and
repairable. The most likely place an open will occur is at the commutator riser
bars. This usually results from overloading of the generator which causes overheating and melting of the solder. Repair can be effected by resoldering the leads
in the riser bars (usingrosin flux) and turning down the commutator in a lathe to
remove the burned spot and then undercutting the mica as explained in the previous paragraph. In some heavy-duty armatures, the leads are welded into the
riser bars and these cannot be repaired by resoldering.
c. Short circuits in the armature are located by use of a growler. When the
armature is revolved in the growler, with a steel strip such as a hacksaw blade
held above it, the blade will vibrate above the area of the armature core in which
the short is located. Copper or brush dust in the slots between the commutator
bars sometimes causes shorts between bars which can be eliminated by cleaning
out the slots. Shorts at cross-overs of the coils at the core endcan often be eliminated by bending wires slightly and reinsulating the exposed bare wire.
d. Grounds in the armature are detectedby use of atest lamp and test points.
If the lamp lights when one test point is placed on the commutator with the other
point on the core or shaft, the armature is grounded. Grounds occur as a result
of insulation failure, which is often brought on by overloading and consequent
overheating of the generator. Repairs can sometimes be made if grounds are at
core ends (where coils come out of slots) by placing insulating strips between
core and coil which has grounded.
11-21. POLARIZING GENERATOR. After a generator has been repaired and
reinstalled or at any time after a generator has been tested, it must be repolarized to make sure that it has the correct polarity with respect to the battery it is
to charge. Failure to repolarize the generator may result in burned relay contact points, a run-down battery and possibly serious damage to the generator itself. The procedure to follow in correcting generator polarity depends upon the
generator-regulatorwiringcircuits;
that is, whether the generator field is internally grounded or is grounded through the regulator. (Refer to paragraph 11-30. )

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PIPER CHEROKEE SERVICE MANUAL

11-22. GENERATOR SERVICE TEST SPECIFICATIONS. Delco-Remy specifications for 14 volt generators installed on PA-28 series airplanes are as follows:
Generator

1101900

Delco-Remy,
Ref, Service Bulletin

1G-150

Brush Spring Tension

24 oz.

Field Current (80° F)
Amps
Volts

1.62 to 1.72
12

Cold Output
Amps
Volts
Approx. RPM

35
14.0
3100

COLD OUTPUT: Cold output data applies to generators at 80 degrees F,
and with brushes well seated. Variations in temperature and brush seating
as well as the condition of the generator may cause deviations of 100 RPM
or more from rated speed.
HOT OUTPUT: Hot output is maximum output as controlled bycurrent regulator.

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11-23.

REGULATOR.

11-24. DESCRIPTION OF REGULATOR. The regulator shown in Figure 11-4
consists of a cutout relay, a voltage regulator and a current regulator unit. The
cutout relaycloses the generator to batterycircuit when the generator voltage is
sufficient to charge the battery, and it opens the circuit when the generator slows
down or stops. The voltage regulator unit is a voltage-limiting device that prevents the system voltage from exceeding a specified maximum and thus protects
the battery and other voltage-sensitive equipment. The current regulator unit is
a current-limiting device that limits the generator output so as not to exceed its
rated maximum.

11-25. CUTOUT RELAY.
a. The cutout relay (Refer to Figure 11-4.) has twowindings, a series winding
of a few turns of heavy wire and a shunt winding of many turns of fine wire (shown
in dashed lines). The shunt winding is connected across the generator so that
generator voltage is impressed upon it at all times. The series winding is connected in series with the charging circuit so that all generator output passes
through it. The relay core and windings are assembled into a frame. A flat steel
armature is attached to the frame by a flexible hinge so that it is centered just
above the stationary contact points. When the generator is not operating, the armature contact points are held away from the stationary points by the tension of
a flat spring riveted on the side of the armature.
b. When the generator voltage builds up a value great enough to charge the
battery, the magnetism induced by the relay windings is sufficient to pull the armature toward the core so that the contact points close. This completes the circuit between the generator and b