Craftsman 919176850 User Manual AIR COMPRESSOR Manuals And Guides L0807019

CRAFTSMAN Air compressor Manual L0807019 CRAFTSMAN Air compressor Owner's Manual, CRAFTSMAN Air compressor installation guides

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Page Count: 17

SEARS
OWNERS
MANUAL
MODEL NO.
919.176850
IMPORTANT:
Read the Safety Guidelines
and All Instructions
Carefully Before Operating
CRAFTSMAN AIR COMPRESSOR
ASSEMBLY
OPERATION
MAINTENANCE
REPAIR PARTS
Record in the spaces provided,
(1) The model number which can be
found on the label on the rear of the
air tank.
(2) The code number which can be
found on the foil label on the rear of
the air tank,
(3) The Manufacturers Number (ASME
Code Compressors only) is located
on the metal data plate which is
welded onto the backside of the air
tank. (This data plate is painted the
same color as the tank.)
(4) The Motor Manufacturers name
which is located on the motor label
or specification plate.
(5) The Motor Mfg. number - also
located on the motor label or specifi-
cation plate.
Retain these numbers for future
reference,
Model No,
Code No.
Mfg. No. __
Motor Mfg, Name
Motor Mfg. No.
81-30-14-7-B 3/89
Sears, Roebuck and Co., Chicago, IL 60684 U.S.A.
TABLE OF CONTENTS
Page
WARRANTY .................................................................. 3
SAFETY GUIDELINES ....................................................... 3
WARNING CHART ........................................................... 3
SPECIFICATION CHART ..................................................... 5
GLOSSARY .................................................................. 5
ACCESSORIES FOR USE WiTH SEARS AIR COMPRESSORS ........... 6
GENERAL INFORMATION ................................................... 6
DESCRIPTION OF OPERATION ............................................. 6
ASSEMBLY INSTRUCTIONS ................................................. 7
Items You Wil! Need to Assembly Your Compressor ............................... 7
Installing Handle ............................................................. 7
Installing Rubber Foot Strip and Wheels ......................................... 8
Installing Shut-Off Valve ...................................................... 8
INSTALLATION AND BREAK-IN PROCEDURES ............................ 8
Location of Air Compressor .................................................... 8
Extension Cords ............................................................. 8
Lubrication and Oil ........................................................... 8
Grounding Instructions ........................................................ 9
Break-in Procedures ......................................................... 9
OPERATING PROCEDURES ................................................ 9
MAINTENANCE .............................................................. 10
Air Filter - Inspection and Replacement ......................................... 10
Oil - Checking and Changing .................................................. 10
Air Tank - Draining Water ..................................................... 10
Check Valve - Replacement ................................................... 10
Safety Valve - Inspection ..................................................... 10
Motor ...................................................................... 10
Belt - Replacement ........................................................... 11
To Adjust Belt Tension ........................................................ 11
Pulley and Flywheel - Alignment ............................................... 1!
STORAGE ......................................................... 11
TROUBLESHOOTING GUIDE ................................................ 11
AIR COMPRESSOR DIAGRAM -AIt Models ................................ 14
Parts List ................................................................... 17
AIR COMPRESSOR PUMP DIAGRAM =. ................................... 15
Parts List ................................................................... 17
HOW TO ORDER REPAIR PARTS ........................................... 18
FULL ONE YEAR WARRANTY
ON AIR COMPRESSORS
If this air compressor fails due to a defect in material or workmanship within one year from the date of
purchase, return it to the nearest Sears Service Center/Department throughout the United States and
Sears will repair it, free of charge.
If this air compressor is used for commercial or rental purposes, the warranty will apply for ninety days
from the date of purchase.
This warranty gives you specific legal rights and you may have other rights that vary from state to
state.
Sears, Roebuck and Co., Sears Tower, Dept. 698/7131 CR-W, Chicago, IL 60684
SAFETY GUIDELINES
This manual contains information that is important for you to know and understand. This information
relates to protecting your safety and preventing equipment problems. To help you recognize this
information, we use the following symbols. Please read the manual and pay special attention to
sections headed by these symbols.
URGENT SAFETY INFORMATION - A
HAZARD THAT WILL CAUSE SERIOUS
INJURY OR LOSS OF LIFE.
IMPORTANT SAFETY INFORMATION - A
HAZARD THAT MIGHT CAUSE SERIOUS
INJURY OR LOSS OF LIFE.
Information for preventing damage to
equipment.
NOTE
Information that you should pay special atten-
tion to.
WARNING
HAZARDS CAN OCCUR IF EQUIPMENT IS NOT USED PROPERLY,
PLEASE READ THE FOLLOWING CHART.
WHAT TO WHAT COULD HAPPEN HOW TO PREVENT IT
LOOK FOR
Compressed
Air Compressed air can propel dust, dirt or loose
particles it comes in contact with.
Too much air pressure applied to air tools or
accessories can cause damage or risk of
bursting.
Never point any nozzle or sprayer toward a person
or any part of the body.
Always wear safety goggles or glasses when using
the air compressor.
Always turn the air compressor off and release air
pressure from hose before attaching or removing
accessories.
Check the manufacturer's maximum pressure rat-
ing for air tools, accessories, or the item you wil!
pressurize. An air regulator must be added for use
with those items having a maximum pressure rat-
ing tess than 125 psL
m_ .....
WHAT TO
LOOK FOR
Unsuita6te
S_vents"
Electricity
Moving
Parts
Toxic Vapors
Air Tank
WHAT COULD HAPPEN HOW TO PREVENT IT
The solvents 1,1,1- Trichloroethane and Methy-
lene Chloride can chemically react with aiumi-
num used in paint spray guns, paint pumps, etc.,
and cause an explosion. These solvents can
also react with galvanized components and
cause corrosion and weakening of parts. This
does not affect your air compressor- but it may
affect the equipment being used.
Your air compressor is powered by electricity.
Like any other electrically powered device, if it is
not used properly it can cause electrical shock.
This compressor cycles automatically when the
switch is in the "On-Auto" position. If you
attempt repair or maintenance while the com-
pressor is operating, or with the switch in the
"On-Auto" position, you can expose yourself to
moving parts. These moving parts can cause
serious injury or damage, if they come into con-
tact with you or your clothing.
Itis normal for compressed air to contain toxic or
irritating vapors. Such vapors are harmful if
inhaled.
Certain materials you are spraying (like paint,
weed killer, sand or insecticide) can be harmful
if you inhale them.
If the material you intend to spray contains the sol-
vents listed at left (read the label or data sheet), do
not use accessories that contain aluminum or gal-
vanized parts. You must either change the material
you intend to spray, or use only stainless steel
spray equipment.
Always unplug the air compressor prior to mainte-
nance or repair.
Never use the air compressor outdoors when it is
raining.
Always plug the cord into an electrical outlet with
the specified voltage and adequate fuse
protection.
Always unplug the unit and release air pressure
from the tank and any accessories before doing
repair or maintenance.
Never operate the compressor with the belt guard
removed.
Never directly inhale the compressed air produced
by this unit.
Read labels and safety data for all materials you
spray. Follow al! safety precautions.
Use a mask or respirator if there is a chance of
inhaling toxic sprayed materials. Masks and
respirators have limits and will only provide protec-
tion against some kinds and limited amounts of
toxic material. Read mask and respirator instruc-
tions carefully. Consult with a safety expert or
industrial hygienist if you are not sure about the use
of a certain mask or respirator.
Modifications to the air compressor can cause
the air tank to rupture or explode.
Changing the air tank will cause it to weaken.
The tank can rupture or explode.
Do not adjust, remove or tamper with the safety
valve or pressure switch. Ifsafety valve or pressure
switch replacement is necessary, a part with the
same pressure rating must be used.
For Service Replacement use only the motor, pul-
ley and belt designed as standard service replace-
ment parts indicated in the parts list. Use of
improper parts could cause overloading of your
unit and electrical supply.
Do not substitute a gas engine for the motor.., this
compressor was not designed to be powered by a
gasoline engine.
Never replace the compressor pump with a differ-
ent model.
Never increase the compressor pump speed.
Do not fix mount or permanently attach the com-
pressor feet. This outfit is intended for portable use
(with wheels) only.
Never drill into, weld, or in any way modify the air
tank. Do not repair a leaking tank, it must be
replaced.
Never replace the air tank with a different model or
a larger tank.
WHAT TO WHAT COULD HAPPEN HOW TO PREVENT IT
LOOK FOR
Hot Parts The compressor head and tubes get hot when Never touch the air compressor head or tubes dur-
the air compressor is running. If you touch them, ing or immediately after operation.
you can be seriously burned.
Flammable It is normal for the motor and pressure switch to Operate the compressor in well ventilated areas
Vapors spark when the compressor starts or stops. A that are free of gasoline, flammable paint or solvent
spark can ignite flammable vapors from vapors.
gasoline, solvents or some paints and cause a If spraying a flammable material - provide ample
fire or explosion. ventilation. Never spray in a closed area. There
must be a flow of fresh air at all times.
SPECIFICATION CHART
Model No. 919.176850
Horsepower 5
Displacement CFM 15.2
Bore 27/8"
Stroke 2"
Voltage-Single Phase 240
Minimum Branch Circuit Requirement 1_ amp
*Fuse Type Fusetron
Type "T"
Air Tank Capacity - Gallons 20 ASME
Approximate Cut-in Pressure 100
Approximate Cut-out Pressure 125
SCFM _ 40 psig 11.3
SCFM (_ 90 psig 9.3
SCFM #! 125 psig 8.0
U,L. Listed Yes
*A circuit breaker is preferred. Use only a fuse or circuit breaker that is the same rating as the branch circuit the air
compressor is operated on. Ifthe air compressor is connected to a circuit protected by fuses, use dual element time delay
fuses (Buss Fusetron Type "T" only).
This air compressor can be operated on a 15
amp circuit if:
1. Voltage supply to circuit is normal.
2. Circuit is not used to supply any other
electrical needs (lights, appliances, etc.)
3. Extension cords comply with specifica-
tions in owners manual.
4. Circuit is equipped with 15 amp circuit
breaker or 15 amp Fuestron Type "T" time
delay fuse.
If any of the above conditions cannot be met, or if opera-
tion of the compressor repeatedly causes interruption of
the power it may be necessary to operate it from a 20
amp circuit. It is not necessary to change the cordset if
this change is made.
GLOSSARY
CFM." Cubic feet per minute.
SCFM: Standard cubic feet per minute; a unit of meas-
ure of air delivery.
PSIG."Pounds per square inch gauge; a unit of measure
of pressure.
ASME: American Society of Mechanical Engineers;
made, tested, inspected and registered to meet the
standards of the ASME.
U.L. Listed: Underwriter Laboratories; Samples of
compressor outfits, taken from production, were sub =
mitted to U.L. and found to comply with their require-
ments for design and performance,
Cut-In Pressure: While the motor is off, air tank pres-
sure drops as you continue to use your accessory. When
the tank pressure drops to a certain low level the motor
will re-start automatically. The low pressure at which the
motor automatically re-starts is called "cut-in pressure."
Cut-Out Pressure: When you turn on your air compres-
sor and it begins to run, air pressure inthe air tank begins
to build. It builds to a certain high pressure before the
motor automatically shuts off - protecting your air tank
from pressure higher than its capacity. The high pres.
sure at which the motor shuts off is caUed "cut-ou
pressure."
ACCESSORIES FOR USE WITH SEARS AIR COMPRESSORS
Tile following accessories are available through the current general sales catalog or at full-line Sears stores.
*SPRAY GUNS
.BLOW GUNS
-AIR CAULKING GUNS
,AIR POWERED WASHER GUNS
-SAND BLASTERS
,AIR BRUSHES
-AIR LINE FILTERS
*TIRE AIR CHUCKS
-PAINT TANKS
*AIR TANKS
*INFLATOR KITS
.QUICK CONNECTOR SETS
(various sizes)
oVISCOSIMETER
*AIR PRESSURE REGULATORS
*OIL FOG LUBRICATORS
*AIR TOOLS:
Sanders
Drills
Impact wrenches
Hammers
,AIR HOSE:
1/4", 5/16" OR 3/8" LD.
in various lengths.
GENERAL INFORMATION
_'ouhave purchased an air compressor unit consisting of
a 2 cylinder, single stage air compressor pump, an air
:ank, air hose, wheels, handle, air chuck and associated
:ontrols and instruments.
Your air compressor can be used for operating paint
spray guns, air tools, caulking guns, grease guns, air
3rushes, sandblasters, power washers, inflating tires
and plastic toys, spraying weed killers, insecticides, etc.
for removal of moisture and oil vapor in compressed air
when a paint spray gun is used.
An in-line lubricator is usually required for air tools to
prolong toot life.
Separate air transformers which combine the functions
of air regulation and/or moisture and dirt removal should
be used where applicable.
Fhis model is not equipped with a pressure regulator. An
_ir pressure regulator is usually necessary for most of
:hese applications. An Air Line Filter is usually required
These accessories can be purchased from most Sears
stores or through the Sears General catalog or Power
Tool catalog.
DESCRIPTION OF OPERATION
\
V/eVE
Air Compressor Pump: To compress air, the pistons
move up and down in the cylinders. On the downstroke,
air is drawn in through the air intake filter and then
through the air intake valves. The exhaust valve remains
closed. On the upstroke of the piston, air is compressed.
The intake valves close and compressed air is forced
out through the exhaust valve, through the outlet tube,
through the check valve and into the air tank. Working air
is not available until the compressor has raised air tank
pressure above that required at the air outlet.
Check Valve: When the air compressor is operating, the
check valve is "open", allowing compressed air to enter
the air tank. When the air compressor reaches "cut-out"
pressure, the check valve "c!oses", allowing air pressure
to remain inside the air tank.
Pressure Switch: The pressure switch automatically
starts the motor when the air tank pressure drops below
the factory set "cut-in" pressure. It stops the motor when
the air tank pressure reaches the factory set "cut-out"
pressure.
Pressure Release Valve: The pressure release valve
located on the side of the pressure switch, is designed to
automatically release compressed air from the com-
pressor head and the outlet tube when the air compres-
sor reaches "cut-out" pressure or is shut off. If the air is
not released, the motor will try to start, but wil be unable
to. The pressure release valve allows the motor to re-
start freely. When the motor stops running, air will be
heard escaping from the valve for a few seconds. No air
should be heard leaking from the valve when the motor is
running.
SafetyValve:ifthe pressure switch does not shut off the
air compressor at or near itscut-out pressure setting, the
safety valve will protect against high pressure by "pop-
ping out" at its factory-set pressure (slightly higher than
the pressure switch cut-out setting).
Shut-Off Valve: Turn the knob counterclockwise to
open the valve and clockwise to close,
ASSEMBLY INSTRUCTIONS
items You Will Need To Assemble Your
Compressor
•16oz, compressor oil, Sears 9-16426 or SAE 20-20W
SF or SG motor oil
•pipe thread sealant
. an adjustable wrench for attaching the shut-off valve
-a 9/16" socket or open-end wrench for attaching the
wheels and hose adapter
Installing Handle
WARNING I
BENT
TABS
THE WHEELS AND HANDLE DO NOT PRO-
VIDE ADEQUATE CLEARANCE, STABILITY
OR SUPPORT FOR PULLING THE UNIT UP
AND DOWN STAIRS OR STEPS. THE UNIT
MUST BE LIFTED OR PUSHED UP A RAMP.
DO NOT LIFT THE UNIT BY THE MANIFOLD
ASSEMBLY. THE UNIT CAN BE DAMAGED.
1. Insert the open end of the handle under the saddle
(Fig. 1). Before attaching handle, you may have to pull
the open ends of the handle apart so they fit tightly
against the side of the saddle. Looking in from the
open end of the saddle, position the handle towards
the two bent tabs, on the inside wails of the saddle.
Slowly push the open ends of the handle onto both
tabs at the same time (Fig. 2). Continue pushing the
handle into the saddle until the holes on the side of the
saddle and handle are in line.
2. Guide the straight end of each retaining ctip through
the saddle hole and both handle holes (Fig. 3).
3. Rotate each retaining clip clockwise and press down
until it snaps into place over the pull handle (Fig. 4).
4. Ifthe handle has excessive movement, it is improperly
installed. Check the following:
A. Are both tabs inside the handle (Step #1)?
B. Does each clip pass through both the saddle and
handle (Step #2)?
SENT TAB
(ONE ON
EACH SIDE)
HANDLE
INSERTED
ON
TABS
SADDLE
FIG. 1
OPEN END
OF HANDLE
FIG. 2
FiG. 3
7
FIG. 4
installing Rubber Foot Strip and Wheels
L.........]
It may be necessary to brace or support one
end of the outfit when attaching the wheels
because the air compressor will have a
tendency to tip.
1. Remove the protective paper strip from the adhesive-
backed rubber foot strip. Attach the rubber foot strip to
the bottom of the air tank leg. Press firmly into place.
(See page 14 key no. 39.)
_-.The leg bracket on the underside of the air compres-
sor tank has 2 holes on each side for mounting the
wheels. Place one shoulder bolt through the hole in a
wheel. Next, push the bolt through the LOWER hole of
the leg bracket and screw on one hex locking nut. The
special locking nut does not turn freely. Tighten the
nut firmly until it contacts the leg. See pg. 14. The
outfit will set level if the wheels are properly installed.
Installing Shut-off Valve
ADAPTER
SHUT-OFF
VALVE
SWIVEL
CONNECTION
Apply a small amount of pipe sealant (not supplied) to
the tapered pipe threads on the adapter and tighten into
the manifold. Install the swivel connection end of the
shut-off valve to the straight threaded end of the adapter
(pipe sealant is not required) and tighten this connec-
tion. See photo above.
INSTALLATION AND BREAK-IN PROCEDURES
Location of the Air Compressor
Operate the air compressor in a clean, dry and well
ventilated area. The air filter must be kept clear of
obstructions which could reduce air delivery of the air
compressor. The air compressor should be located at
least 12" away from walls or other obstructions that could
interfere with the flow of air through the fan bladed fly-
wheel. The air compressor crankcase and head are
3esigned with fins to provide proper cooling.
If humidity is high, a Sears air filter can be installed to
remove excessive moisture, and oil vapor from the air.
Closely follow the instructions packaged with the filter
Forproper installation, it must be installed as close as
oossible to the accessory.
Extension Cords
Foavoid voltage drop and power loss to the motor, use
._xtra air hose instead of an extension cord.
f an extension cord must be used:
use only a 3-wire extension cord that has a 3-blade
grounding plug and a 3-slot receptacle that will accept
the plug on the product.
make sure the extension cord is in good condition.
the extension cord should be no longer than 50 feet.
- the minimum wire size is 12 gauge (AWG) Sears #9-
83606, 12 g. x 50' tg. ext. cord at your local Sears Serv-
ice Center. (Wire size increases as gauge number
decreases. 10 AWG and 8 AWG may also be used. DO
NOT USE 14 AWG or 16 AWG.)
Lubrication and Oil
Compressors are shipped without oil. Do
not attempt to operate this air compressor
without first adding oil to the crankcase,
Place unit on a level surface. Remove oil fill plug (Key no.
77, pg. 15) and slowly add a special compressor oil such
as Sears 9-16426 or SAE 20-20W SF or SG motor oil
until it is even with the top of the oil fill hole. (It must not be
allowed to be lower than %"- 6 threads down - from the
top, at any time.) When filling the crankcase, the oil flows
very slowly. If the oil is added too quickly, it will overflow
and appear to be full. Crankcase oil capacity is !6 fluid
ounces. Under winter-type conditions use SAE 10W oil.
Multi-viscosity oil, 10W30, will leave carbon deposits on
critical components reducing performance and com-
pressor life. Replace oil fill plug.
Grounding instructions
WARNING 1
I II
IMPROPER GROUNDING CAN RESULT IN
ELECTRICAL SHOCK. IN THE EVENT OF A
SHORT CIRCUIT, GROUNDING REDUCES
THE RISK OF SHOCK BY PROVIDING AN
ESCAPE WIRE FOR THE ELECTRIC CUR-
RENT. THIS AIR COMPRESSOR MUST BE
PROPERLY GROUNDED.
1. The air compressor is equipped with a cord having a
grounding wire and an appropriate grounding plug.
The plug must be used with an outlet that has been
installed and grounded in accordance with all local
codes and ordinances. The outlet must have the
same configuration as the plug. DO NOT USE AN
ADAPTER.
2. Do not modify the plug that has been provided, If it
does not fit the available outlet, the correct outlet
should be installed by a qualified electrician.
3. Inspect the plug and cord before each use. Do not use
if there are signs of damage.
ELECTRICAL SHOCK HAZARD. WHEN
REPAIRING OR REPLACING THE CORD OR
PLUG, KEEP THE GROUNDING WIRE SEPA-
RATE FROM THE CURRENT-CARRYING
WIRES. NEVER CONNECT THE GROUND-
ING WIRE TO A FLAT BLADE PLUG TER-
MINAL. (THE GROUNDING WIRE HAS
INSULATION WITH AN OUTER SURFACE
THAT IS GREEN - WITH OR WITHOUT YEL-
LOW STRIPES.)
If these grounding instructions are not completely
understood, or if you are not sure your compressor is
properly grounded, have the installation checked by a
qualified electrician.
PLUG OUTLET
GROUND
240 VOLT, 20 AMP PLUG
GROUNDINGJ
PiN
OUTLET
Break-in Procedures
Serious damage may result if the following
break-in instructions are not closely
followed.
This procedure is required only once, before the air com-
pressor is put into service.
!. Set the pressure switch lever to the "OFF" position.
2. Plug the power cord into the correct branch circuit
receptacle,
3. Open the shut-off valve, turn it counterclockwise to
open, opening it fully, to prevent air pressure build-up
in the tank,
4. Move the pressure switch lever to "ON/AUTO". ThE
compressor will start.
5. Run the compressor for 30 minutes. Make sure the
shut-off valve is open and there is no tank pressur(
build-up,
6. After 30 minutes, close the shut-off valve by turnin(.
the knob clockwise. The air receiver will fill to cut-ou
pressure and the motor will stop. The compressor i:
now ready for use.
OPERATING PROCEDURES
1. Before attaching an air hose or accessory, make sure
the pressure switch lever is in the "OFF" position.
Close the shut-off valve by turning the knob
clockwise.
2. Attach hose and accessory.
WARNING IIII
TOO MUCH AIR PRESSURE CAUSES A
HAZARDOUS RISK OF BURSTING. CARE-
FULLY FOLLOW STEPS 3 THROUGH 11
EACH TIME THE COMPRESSOR IS USED.
3. Check the manufactur's maximum pressure rating for
air tools and accessories. The regulator outlet pres-
sure must never exceed the maximum pressure rat-
ing. On this model, a regulator must be installed
before using accessories rated at less than 125
psig.
Compressed air from the outfit may contain
water condensation and oil mist, Do not
spray unfiltered air at an item that could be
damaged. Some air operated tools or
devices may require filtered air. Read the
instructions for the air tool or device.
4. Turn the pressure switch lever to the "ON-AUTO" posi
tion and allow tank pressure to build. The motor wil
stop when tank pressure reaches cut-out pressure.
5. Open the shut-off valve. Your outfit is ready for use.
When You Are Finished:
6. Set the pressure switch lever to "OFR"
7, Close the shut-off valve.
8. Remove the air tool or accessory.
9. Open the shut-off valve and allow the air to slow
bleed from the tank. Close the shut-off valve wh_
tank pressure is approximately 20 psi.
WATER WILL CONDENSE IN THE AIR TANK.
tF NOT DRAINED, WATER WILL CORRODE
AND WEAKEN THE AIR TANK; CAUSING A
RISK OF AIR TANK RUPTURE.
10. With tank pressure at approximately 20 psi., open
the drain cock and allow moisture to drain. Turn drain
T-handle counterclockwise to open.
NOTE
If the drain cock valve is plugged, release all air
pressure. The valve can then be removed,
cleaned, and reinstalled.
11. After the water has been drained, close the drain
cock (turn clockwise). The air compressor can now
be stored.
MAINTENANCE
WARNING I
UNIT CYCLES AUTOMATICALLY WHEN POWER tS ON. WHEN DOING MAINTENANCE, YOU MAY
BE EXPOSED TO VOLTAGE SOURCES, COMPRESSED AIR OR MOVING PARTS. PERSONAL
INJURIES CAN OCCUR. BEFORE PERFORMING MAINTENANCE OR REPAIR UNPLUG THE UNIT
AND BLEED OFF ALL AIR TANK PRESSURE. NEVER OPERATE THE UNIT WITH THE BELT
GUARD REMOVED.
Air Compressor
A clean air compressor runs cooler and provides longer
service. Clean or blow off fins and any other parts of the
air compressor that collect dust or dirt. Do not place
rags, containers or other material on or against the venti-
lation openings inthe belt guard. Adequate ventilation is
necessary to maintain proper air compressor operating
temperature,
Air Filter -Inspection and Replacement
NOTE
Keep the air filter clean at all times. Do not oper-
ate the compressor with the air filter removed.
A dirty air filter will not allow the compressor to operate
at full capacity. Before you use the compressor, check
the air filter to be sure it is clean.
If it is dirty, replace it with a new filter. The filter may be
removed by using a pair of needle nosed pliers or a
screwdriver. Pull or pry out the old filter. Push in the new
air filter.
Oil - Checking and Changing
Overfilling with oil will cause premature
compressor failure. Do not overfill=
Check oil level in the crankcase daily. Remove the oil fill
plug (Key no. 77, pg. 15). The oil level should be even
with the top of the fill hole and must not be allowed to be
lower than 3/8" from the top (6 threads) at any time. It is
recommended that the oil be changed after every 100
hours of operation. To drain the oil, remove the oil drain
plug and collect the oil in a suitable container. Be sure to
replace the plug securely before adding new oil Use a
special compressor oil such as Sears 9-16426 or SAE
20-20W SF or SG motor oil (Crankcase oil capacity is 16
fluid ounces.) Under extreme winter conditions use SAE
b
10W. Multi-viscosity oil (10W30) will leave carbon
deposits on critical components which will reduce per-
formance and compressor life.
Check Valve - Replacement
1. Release air pressure from the air tank.
2. Loosen the top and bottom tube nuts and remove the
outlet tube,
3. Unscrew the check valve (turn counter-clockwise)
using socket wrench. (7/8").
4. Check that the valve disc moves freely and that the
spring holds the disc in the upper, closed position.
The check valve may be cleaned with a solvent- such
as paint thinner or carburetor cleaner.
5. Apply sealant to the check valve threads. Reinstall the
check valve (turn clockwise). Do not over tighten.
6. Replace the outlet tube and tighten top and bottom
tube nuts.
Safety Valve - Inspection
WARNING J
IF THE SAFETY VALVE DOES NOT WORK
PROPERLY OVER-PRESSURIZATION MAY
OCCUR, CAUSING AIR TANK RUPTURE OR
EXPLOSION. OCCASIONALLY PULL THE
RING ON THE SAFETY VALVE TO MAKE
SURE THAT THE SAFETY VALVE OPER-
ATES FREELY. IF THE VALVE IS STUCK OR
DOES NOT OPERATE SMOOTHLY, IT MUST
BE REPLACED WITH A VALVE HAVING THE
SAME PRESSURE RATING.
Motor
The motor has a manual thermal overload protector, tf
the motor overheats for any reason, the overload protec-
tor wilt shut off the motor. The motor must be allowed to
cool down before restarting. Turn the unit off. To restart,
depress the red reset button located on the end of the
motor and turn the unit on.
NOTE
If the overload protector shuts the motor off fre-
quently, check for a possible voltage problem.
Low voltage can also be suspected when:
!. the motor does not get up to fult power or
speed;
2. fuses blow out when the motor is started.
3. lights dim when motor is started, and remain
dim while it is running,
Belt - Replacement
t WARNING
SERIOUS INJURY OR DAMAGE MAY
OCCUR IF PARTS OFTHE BODY OR LOOSE
ITEMS GET CAUGHT IN MOVING PARTS.
NEVER OPERATE THE OUTFIT WITH THE
BELT GUARD REMOVED. THE BELT GUARD
SHOULD BE REMOVED ONLY WHEN THE
COMPRESSOR IS UNPLUGGED.
To Replace Belt:
1. Unplug compressor.
2. Remove the front of the belt guard by disengaging the
snaps, Insert a flat bladed screwdriver at each snap
location and pry the beltguard apart.
3. The motor is mounted on a special base. By loosening
the wing nut at the motor hold down plate, the motor
can be tilted to allow for easy removal of the belt.
4. Remove belt and replace.
NOTE
The belt must be centered over the grooves on
the flywheel and motor pulley.
5. Tighten the wing nut until it makes contact with the
washer plus one additional turn.
6. Replace the front of the beltguard.
To Adjust Belt Tension:
1. Tighten the wing nut until it contacts the washer, plus
one more turn.
Pulley and Flywheel - Alignment
The compressor flywheel and motor pulley grooves
must be in-line (in the same plane) within 1/32"to assure
belt alignment within grooves. To check alignment, dis-
connect electrical power and remove the beltguard.
Place a straightedge against the outside of the flywheel
and measure the distance from it to the nearest groove.
Alignment is achieved when the other end of the straight-
edge is within 1/32"of the measured dimension at the
pulley groves.
STORAGE
Before You Store The Air Compressor:
1. Review the "Maintenance" section on the preceding
pages and perform maintenance as necessary. Drain
th,e water from the air tank.
2. Set the OFF/AUTO switch to the "OFF" position, and
unplug the unit,
3. Remove the air tool or accessory.
4. Protect the electrical cord and air hose from damage
(such as being stepped on or run over). Wind them
loosely around the outfit handle,
5. Store the compressor in a clean and dry location.
TROUBLESHOOTING GUIDE
WARNING
PERFORMING REPAIRS MAY EXPOSE VOLTAGE SOURCES, MOVING PARTS, OR COM-
PRESSED AIR SOURCES. PERSONAL INJURY MAY OCCUR. PRIOR TO ATTEMPTING ANY
REPAIRS THE COMPRESSOR MUST BE UNPLUGGED AND TANK PRESSURE RELIEVED.
NEVER OPERATE THE UNIT WITH THE BELT GUARD REMOVED.
PROBLEM CAUSE CORRECTION
Excessive tank pressure -
safety valve pops off.
Pressure switch does not shut off
motor when compressor reaches
"cut-out" pressure.
Move the pressure switch lever to the "OFF" posi-
tion. If the outfit doesn't shut off, and the electrical
contacts are welded together, replace the pressure
switch.
If the contacts are good, check to see if the pin ir
the bottom of the pressure relief valve is stuck. If i
does not move freely, replace the valve=
Pressure switch "cut-out" too Return the outfit to the Sears Service Center t(
high. check and adjust or replace switch.
Air leaks at fittings Tube fittings are not tight enough. Tighten fittings where air can be heard escaping
Check fittings under soapy water solution. DC
NOT OVER-TIGHTEN.
TROUBLESHOOTING GUIDE (continued)
ROBLEM CAUSE CORRECTION
ir leaks at check valve Defective or dirty check valve. A defective check valve results in a constant air
leak at the pressure release valve when there is
pressure in the tank and the compressor is shut off.
Remove and clean or replace check valve. DO
NOT OVER-TIGHTEN.
ir leaks at pressure Defective pressure switch Remove and replace the release valve.
,vitch release valve release valve.
Defective check valve. A defective check valve results in a constant air
leak at the pressure release valve when there is
pressure in the tank and the compressor is shut off.
Remove and clean or replace check valve, DO
NOT OVER-TIGHTEN.
,ir leaks in air tank Defective air tank. Air tank must be replaced. Do not repair the leak.
, WARNING
DO NOT DRILL INTO, WELD, OR OTHER-
WISE MODIFY AIR TANK OR IT WILL
WEAKEN.
;ompressor is not supplying
nough air to operate acces-
cries.
:nocking noise
Prolonged excessive use of air. Decrease amount of air usage.
Compressor is not large enough
for air requirement.
Restricted air intake filter.
Hole in hose.
Check Valve restricted.
Air leaks.
Defective check valve.
Check the accessory air requirement. If it is
higher than the CFM or pressure supplied by your
air compressor, you need a larger compressor.
Clean or replace air intake filter.
Check and replace if required.
Remove and clean or replace.
Tighten Fittings. (See Air Leaks Sections of
Troubleshooting Guide.)
Remove and clean or replace,
Loose pulley. Tighten pulley set screw to 70-80 in. tbs.
Low oil level. Maintain prescribed oil level, Add oil.
Loose flywheel. Tighten screw to 15-20 ft. Ibs.
Loose compressor mounting
screws. Check screws. Tighten as required to 15-20
ft. Ibs.
Loose belt. Tighten wing nut on motor mount until it contacts
the washer, plus one more turn.
Carbon build up. Remove the head and valve plate. Clean the valve
plate and the top of the piston. (Be sure carbon
does not fall into the cylinder.) Reassemble using
new gaskets and torque screws, 25 to 30 ft. Ibs,
kit leaks from safety valve Possible defect in safety valve Operate safety valve manually by pulling on ring. If
valve still leaks, it should be replaced.
TROUBLESHOOTING GUIDE (continued)
PROBLEM CAUSE
Excessive belt wear Loose belt.
CORRECTION
Adjust tension. See Belt Replacement, pg. 11.
Adjust tension. See Belt Replacement, pg. 11.
Check for worn keyway or pulley bore. Also
check for bent motor shaft. Replace parts if
necessary.
Tight belt.
Loose pulley.
Pulley misalignment. Motor pulley and flywheel grooves must be in line
within 1/32".
Squealing sound Loose belt. Adjust tension. See Belt Replacement, pg. 11.
There is no oil in the compressor. Add oil.
Motor will not run Motor overload protection switch Let motor coot off and reset switch by pressing th_
has tripped, red button located on the end of the motor.
Tank pressure exceeds pressure
switch "cut-in" pressure.
Wrong gauge wire or length of
extension cord.
Check valve stuck open.
Loose electrical connections.
Motor will start automatically when tank pressur_
drops below "cut-in" pressure of pressure switch.
Check for proper gauge wire and cord length.
Remove and clean or replace. DO NOT OVER
TIGHTEN.
Unplug the compressor. Check wiring connec-
tion inside pressure switch and motor terminal
box area.
Possible defective capacitor.
Paint on internal motor parts.
Return to Sears Service Center for inspection o
replacement if necessary,
Have motor checked at a Sears Service Center.
Do not operate compressor in or near a paint
spray area.
Possible defective motor.
Fuse blown, circuit breaker
tripped.
Pressure release valve on pres-
sure switch has not unloaded
head pressure.
Have checked at a local Sears Service Center.
t. Check fuse box for blown fuse and replace i
necessary. Re-set circuit breaker. Do not use
fuse or circuit breaker with higher rating thal
that specified for your particular branch circuit
2. Check for proper fuse; only Buss Fusetron Typ{
"T" fuses are acceptable.
3. Check for low voltage conditions and/or prope
extension cord.
4. Remove check valve and clean or replace if it i
stuck open or closed.
5. Disconnect the other electrical appliances fror
circuit or operate the compressor on its ow
branch circuit.
Bleed the line by pushing the lever on the pressur
switch to the "OFF" position; if valve does n(
open, replace it.
AIR COMPRESSOR DIAGRAM
(view from back)
54
53
49
\
51
50
48A 48
46
52 \
17
27 28A
25
36A 35
37 (Model No, shown here)
40
(See pg. B, Step 2 for proper
wheel placement and assembly)
COMPRESSOR PUMP DIAGRAM
58
87
! 86
61 60
73
74
75
80 76
... (oil fill plug)
(oildrainplug)
PART LIST (continued)
51 SS-391
52 C-BT-223
53 SSF-986
54 LA-1951
55 SSF-6627
56 CAC-293
57 SSF-955
58 SS-8553
59 SSP-9401
V' 60 CAC-291
•61 265-25
•62 SSF-9821
63 CAC-294
•64 265-196
65 CAC-259
l/ 66 CAC-54-1
•lk 67 CAC-56
4" 68 CAC-58
"1"69 CAC-57
70 CAC-55
71 265-19
72 CAC-207
73 265-410
74 SSF-927
75 CAC-51
76 265-41
77 SSP-1413
78 SSF-925
79 265-3
v" 50 265-16
81 CAC-373
82 265-23
l/ 83 265-13
84 265-9
85 265-2
86 SSN-1014-ZN
87 STD523107
V' 88 265-111
=/ 89 265-6
90 CAC-4284
91 SS-3222-CD
92 CAC-366
Set screw
Poiy-V-Be|t, 39" long
Self-tapping screw (2 used)
Label
Stud 3/8" x 16 both ends (2 used)
Head
Screw, 315-16 x %1/2" (4 used)
Adapter
Adapter
Head gasket
Intake flapper valve -square corners t_
(2 used on head)
Screw #5-40 ×1/4"(8 used)
Restrictor plate (2 used)
Exhaust flapper valve -beveled corners
(2 used on valve plate)
FValve plate
Valve plate gasket
Compression ring (4 used)
Oil ring (4 used)
Oil ring expander (2 used)
Piston (2 used)
Piston pin (2 used)
Piston pin plug (4 used)
Connecting rod assembly (2 used) includes two SSF-927 screws.
Screw, 1/4-20 x 1-1/8" (4 used)
Crankcase and cylinder
Needle bearing
Pipe plug (2 used)
Screw, 1/4-20 x 7/8" (12 used)
Base
Base gasket
Crankshaft
Needle bearing
End plate gasket
End Plate
Flywheel
Belleville washer
Cap screw
Seal
Vent filter
Shut-off valve
Pipe plug
Manifold
9-16269
9-16163
SI-30-14-7-B
NOT ILLUSTRATED
Air chuck
Air hose assembly (1/4" LD. x 15')
Owner's Manual
•_pKey Noo87, 68 and 69, only available in Ring Kit KK-4313
vrKey No, 6, 50, 66, 80, 83, 88 and 89, available as individual parts and part of Gasket Kit KK-43!2-2,
•Key No, 61, 62 and 64, only available in Valve Kit KK-4275o
PARTS LIST
KEY
NO. PART NUMBER
1CAC-322
2 CAC-323
3 SSF-8113-ZN
4 CAC-327
5 CAC-4003-1
6 9-16279
7 265-18
8 SSF-935
9 LA-1779
10 STD575051_
11 STD575050q
12 CAC-317
13 TIA-4150
14 C-GA-345
15 STD575026
16 STD575025
17 CAC-387
18 CAC-1012
19 SSW-7385
20 H-2099
21 CAC-1011
22 CAC-1013
23 SSN-56-ZN
24 SSN-1619-ZN
25 SUDL-415-1
26 SSW-7367
27 LA-1531-1
28 CAC-4221-1
28A KK-4315
29- CAC-4215-1
30 SS-1287
31 CAC-437
32 SSF-928
33 STD-541631 -
34 LA-1848-1
35 CAC-320
36 LA-1814
36A LA-1978
37 LA-1952-1
38 CAC-1059
38A CAC-399
39 SUDL-6=I
40 CAC-66
41 CAC-4293
42 STD541437
43 SS-2707
44 Not Available
45 TA-4072
46 LA-1811-1
47 CAC-287
48 MO-6436
48A LA-1946-1
49 STD580104
50 C=PU-2861
DESCRIPTION
Belt guard, outside
Belt guard, inside
Lock nut
Bracket
Compressor pump assembly
includes Key No. 55 through 89 inclusive.
Intake filter -package of 2 (t used)
Filter retainer
Screw, #8-32 x 3/8" (2 used)
Hot Surface Label (2 used)
Ferrule (2 used for 1/2" O.D. Tube)
Nut (2 used for 1/2" O.D. Tube)
Outlet tube
Safety valve
Pressure gauge
Ferrule (2 used for 1/4" O.D. Tube)
Nut (2 used for 1/4" O.D. Tube)
Pressure release tube
Hold down plate
Strain Relief
Adapter
Eiastomer spring
Hold down screw
Flat Washer
Lock Washer
Cord assembly
Strain relief
Label
Pressure switch
Pressure release valve and mounting nut (Included with #28)
Motor cord assembly
Nipple
Check valve
Screw 5/16"-18 x 7/8" (4 used)
Wing nut
Warning label
Handle
Periodic maintenance labet
Drain tank label
Specification label
Retaining Clip (2 used)
Plastic Sleeve
Rubber foot strip
Shoulder bolt (2 used)
8" wheel (2 used)
Lock nut (2 used)
Drain cock
Code number label
Air tank, 20 gallon ASME
Sears Craftsman label
Pivot pin
Motor, 5 HP
HP label
Motor shaft key (3/16" x 3/16" x 11/4"_
Motor pulley

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