Troybilt 21A 643B711 User Manual REAR TINE TILLER Manuals And Guides L0601227

TROYBILT Rear Tine, Gas Tiller Manual L0601227 TROYBILT Rear Tine, Gas Tiller Owner's Manual, TROYBILT Rear Tine, Gas Tiller installation guides

User Manual: Troybilt 21A-643B711 21A-643B711 TROYBILT REAR-TINE TILLER - Manuals and Guides View the owners manual for your TROYBILT REAR-TINE TILLER #21A643B711. Home:Lawn & Garden Parts:Troybilt Parts:Troybilt REAR-TINE TILLER Manual

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Operator's Manual
Rear-tine

Tiller

Models

643C m Tuffy¢ / Bronco CRT
643B, 645A -- Super BroncoTM

Mode1645A Shown

IMPORTANT:
Warning:

Read safety rules and instructions

This unit is equipped with an internal combustion

carefully

before operating

engine and should not be used on or near any unimproved

equipment.
forest-covered,

brush-

covered or grass-covered land unless the engine's exhaust system is equipped with a spark attester meeting applicable local or state
any). If a spark arrester is used, it should be maintained in effective working order by the operator. In the State of California the above is
by law (Section 4442 of the California Public Resources Code). Other states may have similar laws. Federal laws apply on federal lands.
arrester for the muffler is available through your nearest engine authorized service dealer or contact the service department, P.O. Box
Cleveland, Ohio 44136-0019.

laws (if
required
A spark
361131

Troy-Bilt LLC, P.O. BOX361131CLEVELAND,OHIO44136-0019
PRINTEDIN U.S.A.

FORMNO. 769-00585E.
11/11/05

TABLEOFCONTENTS
Content
Customer Support
Safety
Assembly
Features and Controls

Page
2
3
6
10

Operation

Content
Maintenance
Off-season Storage
Troubleshooting
Parts List

Page
17
21
22
24

Warranty

Back Cover

FINDINGMODELNUMBER
This Operator's Manual is an important part of your new tiller. It will help you assemble, prepare and maintain the unit for
best performance. Please read and understand what it says.
Before you start assembling your new equipment, please locate the model plate on the equipment and
copy the information from it in the space provided below. A sample model plate is also given below. You can
locate the model plate by looking at the rear of the tine shield. This information will be necessary to use the
manufacturer's web site and/or help from the Customer Support Department or an authorized service dealer.

Copy the model number here:
Copy the serial number here:
P. O. BOX

www.troybilt.com

361131

CLEVELAND,
OH44136
330-558-7220

866-840-6483_

CUSTOMER
SUPPORT
Please do NOTreturn the unit to theretailer without first contactingCustomerSupport.
If you have difficulty assembling this product or have any questions regarding the controls, operation or maintenance of
this unit, you can seek help from the experts. Choose from the options below:
Visit troy-bilt.com for many useful suggestions. Click on Customer Support button and you
will get the four options reproduced here. Click on the appropriate button and help is
immediately available.

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If you prefer to reach a Customer Support Representative, please call 1(866) 840-6483.

The engine manufacturer is responsible for all engine-related issues with regard to
performance, power-rating, specifications, warranty and service. Please refer to the engine
manufacturer's Owner's/Operator's Manual, packed separately with your unit, for more
information.

SECTION1: SAFETY
This machine meets voluntary safety standard B71.8-1996, which is sponsored by the
Outdoor Power Equipment Institute, Inc.,
and is published by the American National
Standards Institute.
ForwardClutchBail

ReverseClutchControl
(Mode/s643B& 645A)

WARNING

DepthRegulator

The engine exhaust from this productcontains
chemicals known to the State of California to
TineHoodFlap

cause cancer, birth defects or other reproductive harm.

SafetyAlert Symbol
,_

in
thisis manual
the unit Ittoisalert
This
a safetyand
alertonsymbol.
used
you to potential hazards. When you see
this symbol, read and obey the
message that follows it. Failure to obey
safety messages could result in
personal injury or property damage.

1. Carefully readthis OwnTraining
er's Manual, the separate
Engine Owner's Manual,
and any other literature you may receive.
Be thoroughly familiar with the controls
and the proper use of the tiller and its engine. Know how to stop the unit and disengage the controls quickly.
2. Never allow children to operatethe tiller.
Never allow adults to operatethe tiller
without proper instruction.
3. Keepthe area of operation clear of all
persons, particularly children and pets.
4. Keepin mind that the operator or user is
responsible for accidents or hazards occurring to other people,their property,and
themselves.

Preparation
1. Thoroughly inspect the area where the
tiller is to be usedand remove all foreign
objects.
2. Be sure all tiller controls are released
and both wheels are in the Wheel Drive position before starting the engine.

Counter-Rotating-Tines
(CRT)
Drive Pin
Figure 1-1: Tiller features and contre/s. See separate Engine Owner'sManua/ to
identify engine contre/s.

3. Donot operatethe tiller without wearing
adequateouter garments. Avoid loose garments or jewelry that could get caught in
moving parts.
4. Do not operatethe tiller when barefoot
or wearing sandals, sneakers,or light footwear. Wear protective footwear that will
improve footing on slippery surfaces.

e. Replaceall fuel tank and container
caps securely.
f. If fuel is spilled, do not attempt to
start the engine, but move the machine away from the area of spillage
and avoid creating any source of ignition until fuel vapors havedissipated.

5. Do not till near underground electric cables, telephone lines, pipes or hoses. If in
doubt, contact your telephone or utility
company.

7. Never makeadjustments when engine is
running (unless recommended by manufacturer).

6. Warning: Handlefuel with care; it is
highly flammable and its vapors are explosive. Takethe following precautions:

Operation

a. Store fuel in containers specifically
designed for this purpose.
b. Thegas capshall neverbe removedor
fueladdedwhiletheengineis running.
Allowthe engineto cool for several
minutes beforeadding fuel.
c. Keepmatches, cigarettes, cigars,
pipes, open flames and sparks away
from the fuel tank and fuel container.
d. Fill fuel tank outdoors with extreme
care. Never fill fuel tank indoors. Use
a funnel or spout to prevent spillage.

1. Do not put hands or feet near or under
rotating parts.
2. Exerciseextreme caution when on or
crossing gravel drives, walks, or roads.
Stay alert for hidden hazards or traffic.
3. After striking a foreign object, stop the
engine, removethe wire from the spark
plug wire and prevent it from touching the
spark plug. Thoroughly inspect the machine for any damageand repair the damage before restarting and operating the
machine.
4. Exercisecaution to avoid slipping or falling.

5.If theunitshould
starttovibrate
abnor- If in doubtaboutthe tilling conditions,al- 24. Do not touch engine parts which may
mally,
stoptheengine,
disconnect
the
ways usethe following operating precau- be hot from operation. Let parts cool down
sparkplugwireandprevent
itfromtouch- tionsto assistyou in maintainingcontrol sufficiently.
ingthesparkplug,andcheck
immediatelyof the tiller:
25. Pleaseremember:Youcan alwaysstop
a. Walk behindand to one side of the
forthecause.
Vibration
isgenerally
a
the tines and wheels by releasingthe Forwarning
oftrouble.
tiller, usingone handon the handle ward Clutch Bail or on Models 643B &
bars Relax yourarm, but use a
6.Stoptheengine,
disconnect
thespark
645A the ReverseClutch control, (whichsecure handgrip.
plugwireandprevent
itfromtouching
the
evercontrol is engaged),or by moving the
sparkplug,whenever
youleave
theoperat- b. Use shallower depthregulator
ignition switch and/orthrottle control lever
settings,working gradually deeper on the engine to "OFF" or "STOP".
ingposition,
before
unclogging
thetines,
with each pass.
orwhenmaking
anyrepairs,
adjustments
26. To load or unload the tiller, seethe inc. Use slower engine speeds.
orinspections.
structions in Section 4 of this Manual.
d.
Clear
the
tilling
area
of
all
large
7.Take
allpossible
precautions
whenleav27. Use extreme caution when reversing
stones, rootsor other debris.
ingthemachine
unattended.
Stoptheenor pulling the machine towards you.
e. Avoidusing downwardpressureon
gine.Disconnect
thesparkplugwireand
28. Start the engine carefully according to
the handlebars. If need be, use
moveitaway
fromthesparkplug.Besure
slight upwardpressureto keep the instructions and with feet well away from
thatbothwheels
areintheWheel
Drivepothe tines.
tines from diggingtoo deeply.
sition.
f. Beforecontacting hard packedsoil 29. Neverpick up or carry a machinewhile
8.Before
cleaning,
repairing,
orinspectat the end of a row, reduce engine the engine is running.
ing,stoptheengine
andmakecertain
all
speed and lift the handlebarsto
moving
partshavestopped.
Disconnect
MaintenanceandStorage
raise the tines out of the soil.
thesparkplugwireandprevent
itfrom
g. In an emergency, stopthe tines and 1. Keepthe tiller, attachments and accestouching
thesparkplugtoprevent
acciwheels by releasing whichever
sories in safe working condition.
dental
starting.
clutch controlis engaged.Do not
2. Checkall nuts, bolts, and screws for
9.Theflaponthetinehoodmustbedown
attemptto restrain the tiller.
proper tightness to be sure the equipment
whenoperating
thetiller.
is in safe working condition.
15. Do not overloadthe tiller's capacity by
10.Never
usethetillerunless
proper
attempting to till too deeply at too fast a
3. Neverstore the tiller with fuel in the fuel
guards,
plates,
orothersafety
protective rate.
tank inside a building where ignition sourcdevices
areinplace.
esare present such as hot water and space
11.Donotruntheengine
inanenclosed 16. Never operate the tiller at high transheaters, furnaces, clothes dryers, stoves,
port speeds on hard or slippery surfaces.
area.Engine
exhaust
contains
carbon
electric motors, etc.). Allow the engine to
Look behind and usecare when backing
monoxide
gas,adeadly
poison
thatis
cool before storing the unit in any encloup.
odorless,
colorless,
andtasteless.
sure.
17. Donot operatethe tiller on a slope that
12.Keep
children
andpetsaway.
4. To reducethe chances of a fire hazard,
13. Never operatethe tiller underengine
powerif thewheels are in the Freewheel
position. In the Freewheelposition, the
wheels will not hold the tiller back and the
revolving tines could propel the tiller rapidly, possibly causing loss of control. Always
engagethe wheels with the wheel drive
pins in the Wheel Drive position before
starting the engine or engaging the
tines_vheels with the Forward Clutch Bail
(all models) or the ReverseClutch control
(Models 643B & 645A only).
14. Be aware that the tiller may unexpectedlybounceupwardor jumpforward
if the tines shouldstrike extremely hard
packedsoil, frozen ground,or buried obstacleslike large stones, roots, or
stumps.

is too steep for safety.When on slopes,
slow down and make sure you have good
footing. Neverpermit thetiller to freewheel
down slopes.
18. Never allow bystanders near the unit.

19. Onlyuse attachments and accessories
that are approved by the manufacturer of
the tiller.
20. Usetiller attachments and accessories
when recommended.
21. Never operatethe tiller without good
visibility or light.
22. Neveroperatethe tiller if you are tired;
or under the influence of alcohol, drugs or
medication.
23. Operators shall not tamper with the engine-governor settings on the machine;
the governor controls the maximum safe
operating speed to protect the engine and
all moving parts from damagecaused by
overspeed.Authorized service shall be
sought if a problem exists.

keepthe engine free of grass, leaves,or excessive grease.
5. Store gasoline in a cool, well-ventilated
area, safely away from any spark- or
flame-producing equipment. Store gasoline in an approved container, safely away
from the reachof children.
6. Refer to the Maintenancesections of
this Manual and the separate Engine Owner's Manual for instructions if the unit is to
be stored for an extended period.
7. Never perform maintenancewhile the
engine is running orthe spark plug wire is
connected, except when specifically instructed to do so.
8. If the fuel tank hasto be drained, do this
outdoors.

Decals

Reverse Clutch Control
Forward Clutch Bail

For your safety and the safety of others, various safety and operational decals are located
on your unit (seeFigure 1-2).
Keepthe decals clean and legible at all times.
Contactyour local service dealer or thefactory
for replacementsif any decals are damagedor
missing.

OperatingInstruction

(Models 643B & 645A

StartingStabilization
Message (on engine)

WarningMessages

Referto the Parts List pagesin this Manualfor
decal locations, descriptions and part numbers.

Hot Surfaces Warning

Figure 1-2: Locationof safety and operatingdeca/s.

Operating Symbols

I"1 I*1

Various
symbols
(shownhere,_dth
worddescrip'dons)
maybeusedonte'dllerand
engine.
CHOKE
NOTE:
YourunihT_y
nothaveallof_esymbols.
ON

CHOKE
OFF

R
REVERSE
ROTATING
TINES

<--o-->
FAST

SLOW

STOP

TILLER DIRECTION

BAIL
ENGAGED

LEVERDIRECTION

TO AVOID SERIOUS INJURY:
READTHE OWNER'SMANUAL.
KNOWLOCATIONSAND FUNCTIONSOF ALLCONTROLS.
KEEPALLSAFETYDEVICESANDSHIELDSIN PLACEAND WORKING.
NEVERALLOWCHILDRENOR UNINSTRUCTEDADULTSTO OPERATETILLER.
SHUTOFF ENGINEAND DISCONNECTSPARKPLUGWIRE BEFOREMANUALLYUNCLOGGINGTINES OR MAKINGREPAIRS.
° KEEPBYSTANDERSAWAYFROM MACHINE.
° KEEPAWAYFROM ROTATINGPARTS.
° USEEXTREMECAUTIONWHEN REVERSINGOR PULLINGTHE MACHINETOWARDS
YOU.
*
*
*
.
°

BAIL
DISENGAGED

SECTION2: ASSEMBLY
WARNING:

To prevent

personal injury or property
damage,do not start the engine
until all assembly steps are
complete and you have read
and understand the safety and
operating instructions in this
manual.

INTRODUCTION
Carefully follow these assembly steps to
correctly prepare your tiller for use. It is
recommendedthat you readthis Section in
its entirety before beginning assembly.
NOTE:
Various tiller models are
presented in this Manual. Use only the
information appropriate for your tiller
model. Engine styles vary by model, Your
engine may appear differently than those
illustrated in this manual.

INSPECTUNIT
Inspect the unit and carton for damageimmediatelyafter delivery.Contactthe carrier
(trucking company) if you find or suspect
damage. Inform them of the damageand
request instructions for filing a claim. To
protect your rights, put your claim in writing and mail a copy to the carrier within 15
days after the unit has been delivered.
Contact Troy-Bilt LLCif you need assistance in this matter.

TOOLS/ MATERIALSNEEDED
(2) 1/2" open-end wrench*
(2) 9/16" open-end wrench*
(1) 3/8" open-end wrench*
(1) Large adjustable wrench
(Models 643B & 645A only)
(1) Scissors (to trim plastic ties)
(1) Ruler (for belt tension check)
(1) Block of wood (to support tiller when
removing wheels)
(1) Tire pressure gauge (for models with
pneumatic tires)
(1) Cleanoil funnel
(1) Motor oil. Refertothe EngineOwner's
Manualfor oil specificationsand
quantity required.
* Adjustable wrenches may be used.

ASSEMBLYSTEPS
STEP 1: UNPACKING INSTRUCTIONS

_iiii

NOTE:While unpacking, do not severely
bend any control cables.
1. The tiller weighs approximately 133 Ibs.
Do not attempt to remove it from the shipping platform until instructed to do so in
these Assembly steps.
2. Removeany packaging material from
the carton. Removeany staples from the
bottom of the carton and remove the carton from the shipping platform.
3. Removeall unassembled parts and the
separate hardware bag from the carton.
Checkthat you havethe items listed in the
Loose Parts List (contact your local dealer
or the factory items are missing or damaged).
NOTE: Use the screw length template
(Fig, 2-1) to identify screws,

Loose Parts List
Qty.
Description
1
HandlebarSupport (seeA, Fig. 2-2)
1
HandlebarAssembly (seeK, Fig.2-2)
Hardware bag contents:
4
Hex hd. screw, 5/16-18 x 1-1/2"
2
Hex hd. screw, 3/8-16 x 3/4"
2
Flat Washer,3/8"
4
Split lock washer,5/16"
4
Hex nut, 5/16"-18
2
Hex Iocknut,3_8"-16
*Models 643B & 645A only
IMPORTANT: Motor oil must be added to
the engine crankcase before the engine is
started. Follow the instructions in this
Section and in the separateEngine
Owner's Manual.
NOTE: LEFTand RIGHTsides of the tiller
are as viewed from the operator's position
behind the handlebars.
STEP 2: ATTACH HANDLEBAR
1. Loosely attachthe legs of the handlebar
support (A, Fig. 2-2) to the inner sides of
the tiller frame usingtwo 3/8"-16 x 3/4" hex
hd. screws (B), 3/8" flat washers, and 3/8"16 hex Iocknuts.

Figure2-1: Toidentifylengthofscrews,place
screwontemplateasshownandmeasuredistancebetweenbottomofscrewheadandtipof
screw.

2. Using two 5/16"-18 x 1-1/2" screws (C),
5/16" split lock washers (D) and 5/16"-18
hex nuts (G), loosely attach the handlebar
support (A) using the upper holes. Tighten
the two screws securely.
3. Thereare three height adjustment holes
in the two handlebar support brackets (E
and F,Fig. 2-2). Use a setting that will position the handlebarsat approximately
waist levelwhen the tines are 3"-4" into the
soil. Loosely attachthe support bracketsto
the outside of the handlebar assembly (I)
using two 5/16"-18 x 1-1/2" screws (G), 5/
16"split lock washers (D) and 5/16"-18 hex
nuts (G). NOTE:If a support bracket will
not move, loosen attaching screw (H) and
nut.
IMPORTANT:The support brackets must
beassembled to the outside of the
handlebar assembly.
4. Tighten all handlebar mounting hardware securely.
STEP 3: MOVE TILLER OFF CRATE
To roll the tiller off the shipping platform,
put the wheels in freewheel, as follows:
1. Placea sturdy block under the transmission to raise one wheel about 1" off the
ground.
2. Removethe Klik Pin (J, Fig. 2-3) from
the wheel hub (K) and wheel shaft (L).
3. Slidethe wheelfully inward on the wheel
shaft (N, Fig. 2-3). Reinstallthe Klik pin (J)

The supportbracketsmust
be assembledto the outside
of the handlebar assembly.

Fig.2-3: Wheelin FREEWHEEL
position
(wheeldrivepin throughwheelshaftonly).
STEP 4: INSTALL FORWARD
CLUTCH CABLE
1. Carefully unwrap the forward clutch cable (cable without an attached knob) from
its shipping position and slide the thin cable wire (M, Fig. 2-4) into the slot in the cable bracket. Push the cable connector (N,
Fig. 2-4) up through the hole in the bracket
until the groove in the connector snaps
into place.
2. Threadthe #10-24 hex nut (Z, Fig. 2-5)
halfway onto the screw (V) which runs
through the spring (W, Fig. 2-5).
3. Threadthe screw (V) into the cable adjuster (X).

Fig. 2.2: Attachhandlebar.

through the wheel shaft (L) only (not
through the wheel hub). The wheelshould
now spin freely (freewheel) on the wheel
shaft. Repeatwith the other wheel.
4. Use the handlebar to roll the tiller to a
flat area.
IMPORTANT: Beforestarting the engine,
the wheels must be placed in the WHEEL
DRIVEposition (pins through wheel hubs
and wheel shaft). This procedure is
described in WheelDrive Pins on page 10.

Fig. 2-4:/nstal/ing forward clutchcable bracketand cable.

4. Checkfor correct tension on the forward
drive belt by taking two measurements of
the cable spring, as follows:
a. With the Forward Clutch Bail (Y,Fig. 26) in an open (released)position, measure
the length of the cable spring (W) from the
outermost coil to the outermost coil.
b. Squeezethe Forward Clutch Bail against
the handlebar (see Fig. 2-7) and re-measure the spring length. The belt tension is
correct if this second measurement is between 1/16" to 3/16" longer than the first
measurement. If so, turn the hex nut (Z,
Fig. 2-7) tightly against the cable adjuster
(X) while preventing the cable adjuster
from turning.
c. If the spring length is incorrect, you
must adjust the cabletension as described
in Checkingand Adjusting Forward Drive
Belt Tensionin Section 5. Incorrect cable
tension can result in belt slippage (cable
tension too loose), or unintentional tine
movement when the clutch bail is in Neutral (cabletension too tight).

: v

iiiiiiiiiiiiiiii

Fig. 2-7: Tocheckforwardbelt tension, take two measurementsof the length of the coilsin the
spring-- first with the bah open, then with the bah held against the handlebar.

STEP 5: INSTALL REVERSE CLUTCH

CABLE(MODELS
643BAND 645A ONLY)
1. Unwrap the reverse clutch cable (CC,
Fig. 2-8 and Fig. 2-9) from its shipping position and route it up to the handlebar. Be
sure that the cable is routed beneaththe
Forward Clutch Bail.
2. Insertthe cable(CC,Fig. 2-8)through the
slot in the cablebracketand position the flat
side of the threadedassembly next to the
flat side of the hole. Slidethe hex nut (DD)
up the cable and tighten it securely.
3. Fastenthe reverse clutch cable to the
left side handlebarwith a cabletie (EE,Fig.
2-9).
4. Testthe function ofthe reverseclutch by
pulling out and releasingthe cable knob.
The knob should return to its neutral position (resting against bracket). If it doesn't,
contact your local dealer or Troy-Bilt LLC
for technical assistance.

Fig.2-5: Cable
springand
adjuster.

Flat Side

Fig. 2-8: Install reverse cable bracketand
reverse clutchcable.

Fig. 2-6: Attach forward
clutchcable spring to
forwardclutch bail

Fig. 2-9: Route reverse clutchcable (CC) as
shown. Attach with cable tie (EE).

5! =-P6: CHECKTRAHSMiSSiOH
OIL LEVEL
Thetransmission was filled with gear oil at
the factory. However,you should checkthe
gear oil level at this time to make certain it
is correct.
IMPORTANT:Donot operatethe tiller if the
gear oil level is low. Doing so will result in
severe damageto the transmission components.
1. With the tiller on level ground, pull the
Depth Regulator Lever (FF,Fig. 2-10) back
and then all the way up until the lowest
notch in the lever is engaged.
2. Removethe oil fill plug (GG,Fig. 2-11)
from the transmission housing cover and
locate the main drive shaft situated inside
the housing.
3. Thegear oil level is correct if the gear oil
is approximately halfway up the side of the
main drive shaft.

I El."/: AUU IVlUI UH UIL
Thetiller is shipped withoutoil in the engine.
IMPORTANT:Do not start the engine without first adding motor oil. Severeengine
damagewill result if the engine is run without oil.
1. Refer to the separate Engine Owner's
Manual for engine oil specifications and
capacities.

_ I L:I."8: L;Ht:L;KHAHUWAHt:
Checkall nuts and screws for tightness.
STEP 9: CHECK AIR PRESSURE IN
TIRES (units with pneumatic tires)
Checkthe air pressure with a tire gauge.
Deflateor inflate the tires equally to between 15 PSi and 20 PSi (pounds per
square inch). Besure that both tires are inflated equally or the unit will pull to one
side.

2. With the tiller on levelground, move the
Depth Regulator Lever(FF,Fig.2-10) up or
down until the engine is level.
3. Add motor oil as described in the Engine Owner's Manual.
4. Move the Depth Regulator Lever all the
way down until the highest notch is engaged.This placesthe tines in the "travel"
position, which allows the tiller to be
moved without the tines touching the
ground.

4. Ifthe oil level is low, add gear oil by referring to A, ToCheckthe Transmission
GearOil Level in Section 5.

Fig. 2-10: AdjustDepth Regu/atorLever.

IMPORTANT: This completes the assembly steps. Before operatingyour tiller, make sureyou readthe following sections in this Manual, as well as the
separate Engine Owner's Manual:
• Section 1: Safety
• Section 3: Featuresand Controls
• Section 4: Operation

Fig. 2-11: Remove gear oil fill plug.

SECTION3: FEATURES
ANDCONTROLS
_

operating
your machine,
ARNING:
Before
carefully readand understand
all safety, controls and
operating instructions in this
Manual, the separateEngine
Owner's Manual,and on the
decals on the machine.
Failureto follow these
instructions can result in

Forward Clutch

ReverseClutchControl
(Models643B& 645A)

Regulator

serious personal injury.
INTRODUCTION
This Section describes the location and

Height Adjustment

function of the controls on your tiller. Refer
to the following Section, Operationfor detailed operating instructions.
Practice using these controls, with the engine shut off, until you understand the operation of the controls and feel confident
with each of them.

Wheel Drive Pin
(oneachwheel)

ENGINE CONTROLS
Refer to the engine manufacturer's Engine
Owner's Manual (included in the tiller literature package) to identify the controls on
your engine.

Figure 3-1: Tiller features and controls. See separate Engine Owner's Manual to identify

IMPORTANT:Thecontrol for stopping the
engine is located on the engine.

Use the FREEWHEELmode only when the
engine is not running. In FREEWHEEL,
the
wheel drive pins are placed only through
the holes in the wheel shaft (not the wheel
hubs), thus allowing the wheels to turn
freely when you manually move the tiller.

WHEEL DRIVE PINS
Eachwheel is equipped with a wheel drive
Klik pin (A, Figures 3-2 and 3-3) that secures the wheelto the wheel shaft (B). The
wheels can be positioned in either a
WHEELDRIVEor a FREEWHEELmode.

either
of the wheels
to be in the
WARNING:
Neverallow
FREEWHEELposition when the
engine is running. Always put
both wheels in the WHEEL
DRIVEposition before starting
the engine.
Failureto comply could cause
loss of tiller control, property
damage, or personal injury.

Beforestarting the engine,put both wheels
in the WHEELDRIVEposition by inserting
the wheel drive Klik pins through the wheel
hubs and the wheel shaft. Doingso "locks"
the wheels to the wheel shaft, causing the
wheels to turn when either the

engine controls.

Forward Clutch Bail (all models) or the Reverse Clutch Control (Models 643B &
645A) is engaged.

To place the wheels in WHEELDRIVEor
FREEWHEEL:
1. Stop engine,disconnectspark plug wire
from spark plug and allow engineto cool.

tiller
on its side when
changing
WARNING:
Donot
place
wheel drive positions. Doing so
could result in gasoline leaking
from the fuel tank.
Failureto follow this instruction
could result in personal injury
or property damage.

2. Raise one wheel about one inch off the
ground and place a sturdy support under
the transmission.
3. RemoveKlick Pin (A, Figures3-2 and 33) from wheel drive shaft (B).
4. FORWHEELDRIVEMODE(Figure3-2):
Slide wheel outward and align holes in
lO

Figure3-2: WHEELDRIVEposition.

wheel hub (D, Figure 3-2) and wheel
shaft (B). Insert Klik pin (A) through wheel
hub (C) and wheel shaft (B). Repeatwith
the other wheel and then remove the support from beneaththe transmission.
5. FORFREEWHEELMODE (Figure 3-3):
Slide the wheel inward and insert the Klik
pin (A, Figure3-3) onlythrough the hole in
the wheel shaft (B). Repeatfor the other
wheel and then remove the support from
beneaththe transmission.

WARNING:

Use extreme

caution when reversing or
pulling the machine towards
you. Look behind to avoid
obstacles.
Never attempt to till in reverse.
Failureto follow this warning
could result in personal injury
or property damage.
To operatethe Reverse Clutch Control:
1. Put wheels in WHEELDRIVEposition
(see "WARNING" statement at the left).
Figure 3-3: FREEWHEELposition.

WARNING:

Beforestarting
engine, be sure that both
wheels are in WHEELDRIVE
position. See WheelsDrive Pins
for instructions.
Engagingthe Forward Clutch
Bail or ReverseClutch Control
(if equipped) when the wheels
are not in WHEEL DRIVEcould
allow the tines to rapidly propel
the tiller forward or backward.

2. Stop all tiller motion by releasingthe
Forward Clutch Bail.
3. Lift the handlebar until the tines clear
the ground, look behind you to avoid any
obstacles, and then pull the control knob
(E, Figure3-4) out. The wheels and tines
will rotate in a reverse direction.

HANDLEBAR HEIGHT ADJUSTMENT
Thehandlebar height is adjustable to three
different settings (Figure 3-6). In general,
adjust the handlebars so they are at waist
level when the tines are 3"-4" in the soil.

The Forward Clutch Bail (D, Figure3-4)
controls the engagement of forward drive
to the wheels and tines.

To adjust the handlebars:

To operatethe ForwardClutchBail:
1. Put wheels in WHEEL DRIVEposition
(see "WARNING" statement above).

Figure3-4:All modelshavea ForwardClutch
Bail(E). OnlyModel634,4havea Reverse
ClutchCentre/(F).

2. Lift and hold the clutch bail (D, Figure 34) againstthe handlebarto start the wheels
and tines rotating in a forward direction.

DEPTHREGULATOR
LEVER

(Models 643B & 645A only)
The ReverseClutch Control (E, Figure3-4)
controls the engagement of reverse drive
to the wheels and tines. The reversingfeature is used for maneuvering the tiller
only-- never engage the tines in the
ground while operatingin reverse.

Travel Position

Figure3-5: Depth RegulatorLever (G).

FORWARDCLUTCHBAIL

REVERSECLUTCHCONTROL

to
till too deeplytoo
quickly.
WARNING:
Donot
attempt
Graduallywork down to deeper
tilling depths.
Placethe Depth Regulator
Lever in the "travel" position
before starting the engine. This
position prevents thetines from
touching the ground until you
are readyto begin tilling.
Failureto follow this warning
could result in personalinjury
or property damage.

4. Releasethe control knob to disengage
(stop) the wheels andtines (the engine will
continue to run).

Failureto comply could cause
loss of tiller control, property
damage, or personal injury.

3. Releasethe clutch bail to disengage
(stop) the wheels andtines (the engine will
continue to run).

begintilling at a very shallow depth setting
and gradually increasethe tilling depth.

1. Stop engine, disconnect spark plug wire
from spark plug and allow engine to cool.
2. Remove hardware, reposition handlebars, and reinstall hardware securely.

This lever (F,Figure3-5) controls the tilling
depth of the tines. Pull the lever back and
slide it up or down to engagethe notched
height settings.
The"travel position" (highest notch) raises
the tines approximately 1-1/2" off the
ground, allowing the tiller to be moved
without the tines contacting the ground.
This setting should also be used when
starting the engine.
Moving the lever upward will increase the
tilling depth. The lowest notch allows a tilling depth of approximately 6", depending
on soil conditions. For best results, always
11

High
Medium

Figure3-6: Handlebar height adjustment.

SECTION4: OPERATION
_

1. Completethe Pre-Start Checkliston this
page.

ReverseClutchControl
(Mode/s643B&

operating
your machine,
ARNING:
Before
carefully readand understand
all safety (Section 1), controls
(Section 3) and operating
instructions (Section 4) in this
Manual, the separateEngine
Owner's Manual,and on the
decals on the machine.
Failureto follow these
instructions can result in

2. Putthe wheels in the WHEEL DRIVEposition (see WheelDrive Pinsin Section3 of
this manual).
Clutch Bail

DepthRegulator

serious personal injury.

INTRODUCTION
Readthis OperationSection and the separate Engine Owner's Manual before you
start the engine. Then, take the time to familiarize yourself with the basic operation
of the tiller before using it in the garden.
Findan open, level areaand practice using
the tiller controls without the tines engaging the soil (put tines in "travel" setting).
Only after you've become completely familiar with the tiller should you begin using
it in the garden.

DrivePin
Fig. 4-1

5. Checkthat all safety guards and covers
are in place.
6. Checkair cleanerand engine cooling
system. See Engine Owner's Manual.

BREAK-INOPERATION
Perform the following maintenance after
the first two (2) hours of new operation
(see MaintenanceSection in this manual
and in the Engine Owner's Manual).
1. Changeengine oil.
2. Checkfor loose or missing hardware on
unit. Tighten or replaceas needed.
3. Checktension on forward drive belt.
4. Checktransmission gear oil level.

STARTINGANDSTOPPING
Pre-StartChecklist
With the spark plug wire disconnected
from the spark plug, perform the following
checks and services before each use:
1. Readthe Safetyand Controls Sections
in this manual. Readthe separate Engine
Owner's Manual provided with the unit.
2. Putthe wheels in the WHEELDRIVEposition (wheel pins must be through holes
in wheel hubs and wheel shaft).
3. Checkunit for loose or missing hardware. Service as required.
4. Checkengine oil level. See Engine Owner's Manual.

HIGHLYFLAMMABLEAND
WARNING: GASOLINEITS
IS
VAPORSAREEXPLOSIVE.
Follow gasoline safety rules in
this Manual (seeSection 1) and
in the separate Engine Owner's
Manual.
Failureto follow gasoline safety
instructions can result in
serious personal injury and
property damage.

7. Fill the fuel tank with gasoline according
to the directions in the separate Engine
Owner's Manual. Follow all instructions
and safety rules carefully.
8. Attach spark plug wire to spark plug.
Startingthe Engine
The following steps describe how to start
and stop the engine.

to
engagethe tines
or wheels
WARNING:
Donotattempt
until you have readall of the
operating instructions in this
Section. Also, review the safety
rules in Section 1: Safety, and
the tiller and engine controls
information in Section 3:
Featuresand Controls.

prevent
serious personal
WARNING:
To help injury
or damageto equipment:

• Before starting engine, put both
wheels in the WHEELDRIVE position.
Never have wheels in FREEWHEELposition when engine is running. When
the wheels are in FREEWHEEL,they do
not hold back the tiller and the tines
could propel the tiller rapidly
forward or backward.
• Before starting engine, put Forward
Clutch Bail (all models) and Reverse
Clutch Control (Models 643B & 645A
only) in neutral (disengaged)positions
by releasing levers.
• Never run engine indoors or in enclosed, poorlyventilatedareas. Engine
exhaust containscarbonmonoxide,an
odorlessand deadlygas.
• Avoidenginemuffler andnearbyareas.
Temperaturesin these areas may exceed 150° F.
3. Move the Depth Regulator Lever all the
way down to the "travel" position, so that
the tines clear the ground.
4. Releaseall controls on the tiller.
5. On engine's with a fuel shut-off valve,
turn valve to open position, as instructed
in the separate Engine Owner's Manual.
6. Put ignition switch and/or throttle control lever located on engine in the "ON",
"RUN", "FAST"or "START"position, as instructed in the Engine Owner's Manual.
7. Chokeor prime engine,as instructed in
Engine Owner's Manual.
8. Put one hand on fuel tank to stabilize
unit when pulling starter rope handle.Then
use recoil starter to start engine, as instructed in the Engine Owner's Manual.
Whenengine starts, gradually move choke
lever (if so equipped) to "NO CHOKE",
"CHOKEOFF"or "RUN" position.
9. Use the "FAST"throttle speed setting
when tilling.

3. Start engine and allow it to warm up.
Then put throttle in "FAST"setting.
4. For forwardmotion of the wheels and
power to the tines:
(a) Pull Forward Clutch Bail (Fig. 4-1) up
against handlebar.Releasebail to stop forward motion of wheels and tines.
(b) When tilling, relaxand let the wheels
pull the unit while the tines dig. Walk behind and a little to one side of the unit. Use
Stopping the Engineand Tiller
1. Tostop the wheels and tines, releasethe
Forward Clutch Bail (all models) orthe Reverse Clutch Control (Models 643B &
645A) -- whichever control is in use.
2. Tostop the engine, put the ignition
switch and/or the throttle control lever in
the "OFF"or "STOP" position.

one hand, yet keepa light--but secure-grip on the handlebar (while keepingyour
arm loose). SeeFig. 4-2. Let the unit move
at its own paceand do not push down on
the handlebarsto try and force the tines to
dig deeper-- this takes weight off the
wheels and reduces traction.

OPERATINGTHE TILLER

down
on the handlebarsto
try
WARNING:
Donot push
to make the tiller till more

Thefollowing operating instructions provide guidelines to using your tiller effectively and safely. Besure to read Tilling
Tips & Techniquesin this Section before
actually putting the tines into the soil.

deeply.This prevents the
wheels from holding the tiller
back and can allow the tines to

This is a "Counter-Rotating-Tine" (CRT)
tiller. It operates differently from "Standard-Rotating-Tine" (SRT) tillers. As the
wheels pull forward, the tines rotate backward, creating an "uppercut" action which
digs deeply, uprooting soil and weeds.

control, property damage, or
personal injury.

1. Follow the Pre-Start Checklistat the beginning of this Section. Be sure that the
wheels are in the WHEELDRIVEposition.
2. Move the Depth Regulator Lever all the
way down, so that the tines clear the
ground. Usethis position when practicing
with the tiller and when traveling between
tilling sites. Beforeactually tilling, move
the lever to the desired depth setting (see
Tilling Tips & Techniques).

(b) Swing the handlebarto the left so the
right wheeltakes a "step" backward. Next
swing the handlebarto the right so the left
wheel"steps" backward. Repeatas needed.
(c) If longer distances need to be covered
in reverse,shut off the engine, then place
the two wheels in FREEWHEEL.
7. ToTurn the Tiller Around:
(a) Practiceturning the tiller in a level,
open area.Be very careful to keepyour feet
and legs away from the tines.
(b) Tobegin a turn, lift the handlebarsuntil
thetines areout ofthe ground andtheengine
and tines are balancedoverthe wheels (Fig.
4-4).
(c) With tiller balanced, push sideways on
handlebar to steer in direction of turn (Fig.
4-5). After turning, slowly lower tines into
soil to resume tilling.

rapidly propel the tiller forward,
which could result in loss of

5. For reverse motion of the wheels and
tines (Models 643B & 645A only):
(a) Look behind and exercisecaution when
operating in reverse.Do not till while in
reverse.

Fig. 4-4: Tobegin turn, lift handlebars until
tines are outof groundand unit is balanced.

(b) Stop all forward motion. Lift handlebar
with one hand until tines are off the ground
and then pull ReverseClutch Control knob
out (see Fig.4-3). Tostop reversing, let go
of ReverseClutch Control knob.

Fig. 4-5: With tines out of greund,push handlebars sidewaysto turn tiller.

Fig.4-3: Raisetinesoffgreundandlook
behind whenmovingin reverse.
Fig.4-2: Useonehandtoguidetiller when
movingforward.

6. To move the Model 643C in reversefor
short distances:
(a) Releaseforward Clutch Bail.Then lift
handlebar until tines are off the ground.
13

Stoppingthe Tiller andEngine
1. Tostop the wheels and tines, releasethe
Forward Clutch Bail (all models) orthe Reverse Clutch Control (Models 643B &
645A) -- whichever control is in use.
2. Tostop the engine, put the ignition
switch and/orthe throttle control lever in
the "OFF"or "STOP" position.

TILLINGTIPS& TECHNIQUES
Tilling Depths
WAHNING:

This is a CRT(counter-rotatingtine) tiller. As the wheels pull forward, the tines rotate backward. This createsan "uppercut" tine action which digs deeply,uprooting soil and weeds.
Don't overloadthe engine,but dig as deeplyas possible on eachpass. On later passes,the
wheelsmaytendto spinin thesoft dirt. Helpthem along by lifting up slightly on thehandlebar
(one hand,palm up,works most easily).

Before

tilling, contact your
telephone or utilities
company and inquire if
underground equipment or
lines are usedon your
property. Do not till near
buried electric cables,
telephone lines, pipes or
hoses.

Avoidthe temptation to push down on the handlebarsin an attemptto force thetiller to dig
deeper.Doingso takesthe weight off the poweredwheels,causingthem to lose traction.
Withoutthe wheelsto hold the tiller back,the tineswill attempt to propelthe tiller backward,
towardsthe operator.(Sometimes,slight downward pressureon the handlebarswill help get
througha particularlytough sectionof sod or unbrokenground, but in most casesthis won't
be necessary.)

• Whencultivating (breakingup surfacesoil around plants to destroyweeds,seeFig.4-9), a just the tines to dig only 1"to 2" deep.Using
shallow tilling depths helps prevent injury to plants whose roots often grow close to the surface. If needed,lift up on the handlebars
slightly to preventthe tinesfrom diggingtoo deeply.(Cultivatingon a regularbasisnot only eliminatesweeds,it alsoloosensand aerates
thesoil for better moistureabsorptionandfaster plantgrowth.) Wateringthegardenareaa few days prior to tilling will maketilling easier,
aswill letting the newlyworked soil set for a dayor two beforemakinga final, deeptilling pass.

ChoosingCorrectWheel & Tine Speeds With experience,you will find the "just right" tilling depth and tilling speedcombination
that is best for your garden.
Setthe enginethrottle leverat a speedto givethe engineadequatepowerand yet allow it to operateat the slowest possiblespeed...atleast
until you haveachievedthe maximum tilling depth you desire. Fasterenginespeedsmay be desirablewhen makingfinal passesthrough
the seedbedor whencultivating. Selectionof the correct enginespeed,in relationto the tilling depth, will ensurea sufficientpower levelto
do the job without causingthe engineto labor.

Let the Tiller Dothe Work

AvoidMaking Footprints

Whiletilling, relaxand letthe wheelspull the
tiller along while the tines do the digging.
Walk on the side that is not yet finished (to
avoid makingfootprints in the freshly tilled
soil) and lightly, but securelygrip the handlebarwith just one hand.

AvoidTilling Soggy, Wet Soil

Whenever possible, walk on the untilled Tilling wet soil often results in large,hard
sideof the unit to avoid makingfootprints in clumps of soil that can interfere with plantyour freshly tilled or cultivated soil. Foot- ing. If time permits, wait a day or two after
prints causesoil compaction that can ham- heavy rains to allow the soil to dry before
per root penetration and contribute to soil tilling. Testsoil by squeezingit into a ball. If
erosion. They can also "plant" unwanted it compressestoo easily,it is too wet to till.
weed seeds back into the freshly tilled
ground.

Preparing Seedbeds
• Whenpreparinga seedbed,go overthe samepathtwice in thefirst row, then overlap one-halfthetiller width on the rest of the passes(seeFig. 6). Whenfinished in
one direction, makea second pass at a right angle,as shown in Fig.4-7. Overlap
eachpassfor best results (in very hardground, it may takethree or four passesto
thoroughly pulverizethe soil.)

Fig. 4-6

Fig. 4-7

Cultivating
• If the gardensize will not permit lengthwiseand thencrosswisetilling, then overlapthefirst passesby one-halfa tiller

With planning, you can =,,_r,_,
..,'q r_
allow enoughroom
_"
_
(_

width,followed by successivepasses
at one-quarterwidth (seeFig. 4-8).

between rows to cultivate _

(seeFig.4-9). Leaveroom _
for the hood width,
plus enough extra _

....................
v
.................................
_ _

Fig. 4-8

room for future plant
growth.
14

_'
Fig. 4-9

TILLINGTIPS & TECHNIQUES
(CON'T)
Tilling OnSlopes
Read the followingrecommendationsbeforetilling on slopes:

WAHNING:

If you must gardenon a moderateslope, pleasefollow two very importantguidelines:
1. Till only on moderateslopes,neveron steepground wherefooting is difficult (review safety rulesin Section 1: Safetyof this manual).
2. We recommendtilling up and down slopes ratherthan terracing. Tilling vertically on a
slopeallows maximum plantingarea and also leavesroom for cultivating.
IMPORTANT:
Whentilling on slopes, be surethe correct oil levelis maintainedin the engine
(checkevery one-half hour of operation).The inclineof the slopewill causethe oil to slant
awayfrom its normal leveland this can starveengineparts of requiredlubrication. Keepthe
motor oil levelat the full point at all times!

Do not

operatetiller on a slope too
steep for safe operation. Till
slowly and be sure you have
good footing. Neverpermit
tiller to freewheel down
slopes. Failureto follow this
warning could result in
personal injury.

Tilling Up and DownSlopes(Vertical Tilling)
• To keepsoil erosionto a minimum, be sureto add enough organicmatterto the soil sothat it has good moisture-holdingtexture and try
to avoid leavingfootprints or wheelmarks.
• Whentilling vertically,try to makethe first passuphill as thetiller digs moredeeplygoing uphillthan it doesdownhill. In soft soil or weeds,
you may haveto lift the handlebarsslightly while going uphill. Whengoing downhill, overlapthe first passby about one-halfthe width of
the tiller.

Clearingthe Tines
The tines have a self-clearing action which eliminates most tangling of debris in the
tines. However,occasionally dry grass, stringy stalks or tough vines may become tangled. Follow these procedures to help avoid tangling and to clean the tines, if necessary.
• To reducetangling, set the depth regulator deep enough to get maximum "chopping"
action as the tines chop the material against the ground. Also, try to till under crop
residues or cover crops while they are green, moist and tender.
• While tilling, try swaying the handlebars from side to side (about 6" to 12"). This
"fishtailing" action often clearsthe tines of debris.
• If tangling occurs, lift the tines out of the soil and run the tiller in reverse (if unit is
equipped with powered reverse) for a few feet. This reversing action should unwind a
good deal of debris.

Loadingand Unloadingthe Tiller
_

unloading
the tiller Loading
into avehicle
ARNING:
and is
potentially hazardousandwe don't
recommend doing so unless
absolutely necessary,as this could
result in personal injury or
property damage.
However, if you must load or
unload the tiller, follow the
guidelines given next.

• Before loading or unloading, stop the engine,
wait for all parts to stop moving,
disconnect the spark plug wire and let the engine and muffler cool.
• The tiller is too heavy and bulky to lift safely
by one person. Two or more people should
share the load.

• It may be necessaryto remove the debris by hand (a
pocket knife will help you to cut awaythe material). Be
sure to stop the engine and disconnect the spark plug
wire before clearing the tines by hand.

tines
by hand, stopBeforeclearing
the engine,allow
WARNING:
theall
moving parts to stop and disconnect the
spark plug wire. Removethe ignition key
on electric start models.
Failureto follow this warning could result
in personal injury.

• Use sturdy ramps and manually (engine shut
off) roll the tiller into and out of the
vehicle. Two or more people are neededto do
this.

• When going up ramps, stand in the
normal operating position and push the tiller
ahead of you. Havea person at eachside to
turn the wheels.

• The ramps must be strong enoughto support
the combined weight of the tiller and any handlers. The ramps should provide good traction
to prevent slipping; they should have side rails
to guide the tiller along the ramps; and they
should havea locking device to secure them to
the
vehicle.

• When going down ramps, walk backward
with the tiller following you. Keep alert for any
obstacles behind you. Position a person at
eachwheel to control the speed of the tiller.
Nevergo down ramps tiller-first, as the tiller
could tip forward.
• Placewooden blocks on the downhill side of

• The handlersshould wearsturdy footwear that
will helpto preventslipping.
• Position the loading vehicle so that the ramp
angle is as flat as possible (the less incline to
the ramp, the better). Turn the
vehicle's engine off and apply its parking brake.

the wheels if you needto stop the tiller from
rolling down the ramp. Also, use the blocks to
temporarily keep the tiller in place on the
ramps (if necessary),and to chock the wheels
in place after the tiller is in the vehicle.
• After loading the tiller, prevent it from rolling
by engaging the wheels in the WHEELDRIVE
position. Chock the wheels with blocks and securely tie the tiller down.

TILLINGTIPS & TECHNIQUES
(CON'T)
TerraceGardening(continued)
• Tocreate a terrace, start at the top of the slopeand work down. Go back and
forth acrossthe first row as shown in Fig.4-10.
• Eachsucceedinglowerterrace is startedby walking belowthe terrace you're 0
preparing.Foraddedstability of thetiller, alwayskeepthe uphill wheel in thesoft,
newlytilled soil. Do not till the last 12" or more of the downhill outside edge of
eachterrace.This untilled strip helpspreventsthe terracesfrom breakingapart

and washing downhill. It alsoprovidesa walking path betweenrows.

_, REPEAT

Fig. 4-10

LOADINGAND UNLOADING
THE TILLER

unloading
the tiller
into a and
WARNING:
Loading
vehicle is potentially hazardous
and we don't recommend doing
so unlessabsolutely necessary,
asthis could result in personal
injury or property damage.
However, if you must load or
unload the tiller, follow the
guidelines given next.

• Before loading or unloading, stop the engine, wait for all parts to stop moving,
disconnect the spark plug wire and let the
engine and muffler cool.
• The tiller is too heavy and bulky to lift
safely by one person. Two or more people
should share the load.

• Use sturdy ramps and manually (engine
shut off) roll the tiller into and out of the
vehicle. Two or more people are neededto
do this.

• When going up ramps, stand in the
normal operating position and push the
tiller ahead of you. Havea person at each
side to turn the wheels.

• The ramps must be strong enough to
support the combined weight of the tiller
and any handlers. The ramps should provide good traction to prevent slipping; they
should have side rails to guide the tiller
along the ramps; and they should have a
locking device to secure them to the
vehicle.

• When going down ramps, walk backward
with the tiller following you. Keep alert for
any obstacles behind you. Position a person at each wheel to control the speed of
the tiller. Nevergo down ramps tiller-first,
as the tiller could tip forward.
• Placewooden blocks on the downhill side

• The handlersshould wearsturdy footwear
that will help to preventslipping.
• Position the loading vehicle so that the
ramp angle is as flat as possible (the less
incline to the ramp, the better). Turn the
vehicle's engine off and apply its parking
brake.

of the wheels if you need to stop the tiller
from rolling down the ramp. Also, use the
blocks to temporarily keepthe tiller in
place on the ramps (if necessary),and to
chock the wheels in placeafter the tiller is
in the vehicle.
• After loading the tiller, prevent it from
rolling by engaging the wheels in the
WHEELDRIVEposition. Chockthe wheels
with blocks and securely tie the tiller down.

SECTION5: MAINTENANCE
WARNING:

Before

TILLER LUBRICATION

inspecting, cleaning or servicing
the machine, shut off engine,
wait for all moving parts to come
to a complete stop, disconnect
spark plug wire and move wire
away from spark plug. Remove
ignition key on electric start
models.
Failureto follow these
instructions can result in serious
personal injury or property
damage.

MAINTENANCESCHEDULE

After every 10 operating hours, oil or
grease the lubrication points shown in
Figure5-1 and described below.
Useclean lubricating oil (#30 weight motor
oil is suitable) and clean general purpose
grease (greasecontaining a metal lubricant
is preferred, if available).
• Removethe wheels,cleanthe wheel shaft
(A, Fig. 5-1) and apply a thin coating of
grease to the wheel shaft.
• Greasethe back, front and sides of the
depth regulator lever (B, Fig. 5-1).
• Removethe tines and clean the tine shaft

NOTES

PROCEDURE
Check motor oil level

2,3

Clean engine

2,7

Check drive belt tension

1,4

Check nuts and bolts

1,4

Change motor oil

4,6,9
4

Lubricate tiller

(C, Fig. 5-1). Usea file or sandpaperto gently remove any rust, burrs or rough spots
(especiallyaround holes in shaft). Apply
grease to ends of shaft before installing
tines.
• Oil the threads on the handlebar height
adjustment screws and the handlebar
attaching screws (D, Fig. 5-1).

Service engine air cleaner system
Check gear oil level in transmission

1,5

Checktines for wear

Check air pressure in tires
(if unit has pneumatic tires)

2
3
4

Every 5 operating hours.
Every 10 operating hours,

5
6

Every 30 operating hours,
Changemore frequently in dusty conditions.

7 -

See Engine Owner's Manual forservice
recommendations.

8 -

Whichever time interval occurs firsL

g -

Changeafter first 2 hours of break-in

IMPORTANT:Never operatethe tiller if
the transmission is low on oil. Checkthe
oil level after every 30 hours of
operation and whenever there is any oil
leakage.

CHECK HARDWARE
Checkfor loose or missing hardwareafter every 10 operatinghours and tighten
or replace(as needed) before reusing
tiller
Be sure to checkthe screws underneath
the tiller hood that securethe transmission cover and the Depth RegulatorLever
to the transmission.

CHECKTIRE PRESSURE
Checkthe air pressure in both tires. The
air pressure should be between 15 PSi
and 20 PSi (pounds per square inch).
Keep both tires equally inflated to help
prevent machine from pulling to one
side.

NOTES
Check after first 2 hours of break-in operation.
Before each use.

seal, the oil seal probably needsto be
replaced. Seeyour authorized dealer or
contact the factory for service or advice.

(Modelswith pneumatictires)

Service spark plug

If a cover is leaking, check for loose
screws. If the screws are tight, a new
gasket or oil seal may be required.
If the leak is from around a shaft and oil

TRANSMISSION
GEAROIL SERVICE
Checkthe transmission gear oil level
after every 30 hours of operation or
whenever you notice any oil leak. Operating the tiller when the transmission is
low on oil can result in severe damage.
Figure 5-1

CHECKFOROIL LEAKS
Beforeeach use, checkthe tiller for signs of
an oil leak-- usually a dirty, oily accumulation either on the unit or on the floor.
A little seepagearound a cover or an oil
seal is usually not a cause for alarm. However, if the oil drips overnight, then immediate attention is needed. Ignoring an off
leak can result in severe transmission
damage!
17

A. To Check the Transmission
Gear Oil Level:
1. Checkthe gear oil level when the
transmission is cool. Gear oil will
expand in warm operatingtemperatures
and this expansion will provide an incorrect oil level reading.
2. With the tiller on levelground, pull the
Depth Regulator Leverall the way up.
3. Removethe oil fill plug (A, Fig. 5-2)
from the transmission housing and look
inside the oil fill hole to locate the main
drive shaft situated below the hole.

moving
parts to come
to a completecleaning
stop, disconnect
spark
wire and move
wire away
WARNING:
Beforeinspecting,
or servicing
theplug
machine,shut
off engine,
waitfrom
for all
spark plug. Failureto follow these instructions can result in serious personal injury or property
damage.

4. Thegear oil level is correct if the gear oil
is approximately halfway up the side of the
main drive shaft.
5. If the gear oil level is low, add gear oil as
described next. If the gear oil level is okay,
securely replacethe oil fill plug.
IMPORTANT:Donot operatethe tiller if the
gear oil level is low. Doing so will result in
severe damageto the transmission components.

B. To Drain theTransmissionGear Oil:

BOLOTINES

Thetransmission gear oil does not needto
be changed unless it has been contaminated with dirt, sand or metal particles.
1. Drain gasoline from the fuel tank or run
the engine until the fuel tank is empty. See
"DANGER"statement below.

The bolo tines will wear with useand
should be inspected at the beginning of
eachtilling seasonand after every 30 operating hours. The tines can be replacedeither individually or as a complete set. See
the Parts List pagesfor tine identification
and part numbers.

WARNING:

Gasolineis

highly flammable and its vapors
are explosive. Follow these
safety practices to prevent
personal injury or property
damagefrom fire or explosion.
Allow the engine and muffler to cool
for at least two minutesbefore drainingthe tiller's gasolinetank.
Do not allow open flames, sparks,
matchesor smoking in the area.
Wipe away spills and pushtiller away
from spilled fuel.
Use only an approved fuel container
and store it safely out of the reach of
children.

Figure5-2:Removeoff fi/I p/ug (tl) to check
gearoff levelandtoaddgearoiL Remove
fourcoverscrews(B)todraingearoil.
6. If adding only a few ounces of gear oil,
use API rated GL-4 or GL-5 gear oil having
a viscosity of SAE 140, SAE85W-140 or
SAE 80W-90. If refilling an empty transmission, use only GL-4 gear oil having a
viscosity of SAE 85W-140 or SAE 140.
IMPORTANT:Do not use automatic transmission fluid or motor oil in the transmission.
7. While checking frequently to avoid overfilling, slowly add gear oil into the oil fill
hole until it reachesthe halfway point on
the drive shaft.
8. Securely replacethe oil fill plug.

Do not store gasoline in an area where
its vapors could reach an open flame
or spark, or where ignitionsourcesare
present (such as hot water and space
heaters, furnaces, clothes dryers,
stoves, electric motors, etc.)

2. Drain the oil from the engine.
3. Removefour screws (B, Figure5-2) and
removetransmissioncover and gasket.
4. Removethe left-side wheel.
5. Tilt the left-side wheel shaft into a drain
pan and allow the gear oil to drain through
the top of the transmission.
6. Reinstall the wheel.
7. Install a new gasket (do not reuse old
gasket) and reinstall the transmission cover.
8. Refill the transmission using GL-4 gear
oil (SAE 85W-140 or SAE 140).
g. Refill the engine with motor oil and replenish the fuel tank with gasoline.

A. Tine Inspection:
With use, the tines will become shorter,
narrower and pointed. Badlyworn tines
will result in a loss of tilling depth, and reduced effectiveness when chopping up
and turning under organic matter.
B. Removing4nstalling a Single Tine:
1. With the engine shut off and the spark
plug wire disconnected, remove the two
screws (A, Figure5-3) and nuts (B) that attach a single tine to a tine holder.If needed,
usepenetrating oil on the nuts.
2. When installing a single tine, be sure to
position it so that its cutting edge (sharp)
will enter the soft first as the tiller moves
forward.
C. Removing4nstallinga Tine Assembly:
1. A tine assembly consists of eight tines
mounted on a tine holder.
2. If removing both tine assemblies, mark
them "left" and "right" before removal. Remove the screw (C, Figure5-3) and locknut (D)that secure the tine assembly to the
tine shaft. If necessary,usea rubber mallet
to tap the tine assembly outward off the
shaft.
3. Beforereinstalling the tine assembly,inspectthe tine shaft for rust, rough spots or
burrs. Lightly file or sand, as needed. Apply a thin coat of greaseto the shaft.
4. Install each tine assembly so that the
cutting (sharp) edge of the tines wifl enter
thesoil first when the filler movesforward.
Securethe fine assembly to the tine shaft
using the screw and Iocknut

b. Unthread the hex nut (C, Figure 5-4)
halfway up the adjustment screw (D).
c. Unhookthe top of the spring from the
Forward Clutch Bail.
d. Use pliers to prevent the adjuster (B)
from turning and turn the slotted screw located inside the spring clockwise (viewed
from operator's position) to increase tension on the spring. Turnthe screw counterclockwise to decreasetension. Once
adjusted, reattachthe spring to the Forward Clutch Bail.

e. RepeatSteps2 and 3 to re-measurethe
length of the spring. Whenthe second measurementis between1/16"-to- 3/16" longer
than thefirst measurement,retightenthe hex
nut (C)againstthe top of the adjuster (B).

FORWARD

ReplacementBelt Information
Figure 5-3: Install tinesso that cuttingedge oftines entersoft first when tiller movesforward.

CHECKINGAND ADJUSTING
FORWARDDRIVE BELT TENSION
It is important to maintain correct tension
on the forward drive belt. A loosebelt will
causethe tines and wheelsto slow down-or stop completely -- eventhough the engine is running at full speed. A too tight
belt can result in unintentional tine movement when the clutch bail is in the Neutral

tension is correct if this second measurement is between 1/6"-to- 3/16" longer than
the first measurement.
4. If the spring is too short (less than
1/16"), the tension is too loose. If the
spring is too long (more than 3/16"), the
tension is too tight.

If the drive belt needsto be replaced, see
your local authorized dealer or refer to the
Parts List for ordering information. Use
only a factory-authorized belt as an "overthe-counter" belt may not perform satisfactorily. The procedure requires average
mechanicalability and commonly available
tools.

5. Toadjust the length of the spring:
a. Releasethe Forward Clutch Bail.

(released) position.
• Checkbelt tension after the first two
hours of break-in operation and after every
10 operating hours.
• At the end of each tilling season, check
the belt for cracks, cuts or frayed edges
and replace it as soon as possible.
To CheckForwardBelt Tension:
1. Stop engine, wait for all parts to stop
moving and disconnect spark plug wire.
2. With the Forward Clutch Bail in an open
(released) position, measure and note the
overall length of the cable spring (A, Figure
5-4) by measuring from the outermost coil
to the outermost coil.
3. Squeezethe Forward Clutch Bail against
the handlebar (see Figure 5-4) and remeasure the length of the coils. The belt

Figure5-4: Tocheckforwardbelt tension, take twomeasurementsof the
overa// length of the coilsin the spring-- first with the dutch bail open,
then with the dutch bail closedagainst the handlebar.
19

FORWARDCLUTCH
BAIL ADJUSTMENT
If the Forward Clutch Bail does not function properly, first checkthat the forward
drive belt is adjusted properly (see Checking and Adjusting Forward Drive Belt Tension). If this fails to correct the problem,
contact Troy-Bilt LLC or your authorized
dealer for service advice.

CHECKINGANDADJUSTINGREVERSEDRIVEBELTTENSION
(Models643B & 645A only)
It is important to maintain correct tension
on the reversedrive belt. A loose belt will
causethe tines and wheels to slow down or stop completely - eventhough the engine is running at full speed.

5. Releasethe ReverseClutch Control

Replacement Belt Information

knob.and then unthread the inner jam nut
(C, Figure 5-6) one to two turns. Pull the
threaded cable adjuster (A, Figure 5-6) to
the left until the inner jam nut (C) touches
the bracket.

6. Preventthe inner jam nut (C) from turning and tighten the outer jam nut (D)
against the bracket. Prevent the outer jam
nut (D) from turning and tighten the inner
jam nut (C) against the bracket.
7. Measure the gap by repeating Step 3.
Readjust as needed by repeating Steps 5
and 6.
8. Reinstall the belt cover.

Keepingthe engine clean will help to ensure smooth operation and prevent damage from overheating. Refer to the Engine
Owner's Manualfor engine cleaning service intervals and instructions. Be sure
that the muffler is cool beforeservicing the
engine.

AIRCLEANERSERVICE

Whenchecking belttension, also checkthe
belt for cracks, cuts or frayed edgesand
replace it as soon as possible.
• Checkbelt tension after the first two
hours of break-in operation and after every
10 operating hours.
To CheckReverse BeltTension:
1. Stop engine, wait for all parts to stop
moving and disconnect spark plug wire.
2. Removescrew in plastic belt cover and
slide belt cover (which is attached to forward clutch cable) out of the way.

ENGINECLEANING

Figure5-5: Measure cable wire length to
checkfor correct reversebelt tension.

The air cleaner filters dirt and dust out of
the air before it enters the carburetor. Operating the engine with a dirty, clogged air
filter can cause poor performance and
damageto the engine. Never operatethe
engine without the air cleanerinstalled. Inspect and service the air cleaner more often if operating in very dusty or dirty
conditions. Refer to the engine Owner's
Manualfor air cleanerservice intervals and
instructions.

ENGINE OIL SERVICE

3. Have an assistant pull the Reverse
Clutch Control knob all the way out and
hold it in that position. Measurethe length
of the cable wire between the end of the

Checkthe engine oil level before each use
and after every five hours of continuous
operation. Runningthe engine when it is
low on oil will quickly ruin the engine.

threaded cableadjuster (A, Figure5-5) and
the end of the Z-fitting (B) to which the cable wire is attached.

It is recommendedthat you changethe
motor oil after every 10 hours of operation
and even sooner when operating in extremely dirty or dusty conditions. Referto
the Engine Owner's Manual for detailed
service instructions.

4. Thebelt tension is ideal if the cablewire
length measuresbetween1/8"to 1/4".If it is
less than 1/8" (and if there is no reverseaction whenthe tiller is running), then make
the following adjustments
NOTE:If the lengthis morethan 1/4",no adjustment is needed--as long asthe reverse
action functions properly.

A. To Checkthe Engine Oil Level:
1. Parkthe tiller on a levelareaand shut off
the engine.
Figure5-6: Movethreadedadjuster(,4)toleft
toincreasebelt tension.
2O

2. Levelthe engine (use the Depth Regulator Leverto adjust the engine angle).

3. Cleanaround the oil dipstick or oil fill
tube (whichever applies) to prevent dirt
from failing into the crankcase.
4. On engines with an oil fill tube, remove
the fill cap and add oil (if required) until it
reachesthe top of the fill tube. Reinstallthe
fill cap.
5. On engines with a dipstick, remove it
and wipe it clean. Reinsertthe dipstick,
tighten it securely, and remove it. Add oil
as neededto bring the level up to the FULL
mark. Wipe dipstick clean each time oil
level is checked. Do not overfill. Tighten
dipstick securely.
B. To Change the Engine Oil:
Changethe engine oil as instructed in the
Engine Owner's Manual.

SPARKPLUGSERVICE
Inspect and cleanor replacethe spark plug
after every 100 operating hours or annually. Refer to the Engine Owner's Manualfor
spark plug service instructions.
In some areas, local law requires using resistor spark plugs to suppress ignition signals. If the engine was originally equipped
with a resistor spark plug, use the same
type for replacement.

SPARKARRESTERSCREEN
SERVICE

THROTTLELEVERADJUSTMENT OFF-SEASONSTORAGE
If the engine does not respond to various
throttle lever settings, refer to the Engine
Owner's Manual for service information or
contact your local authorized engine
dealer.
WARNING:
Operators
shall not tamper with the engine
governor settings on the
machine;the governor controls
the maximum safe operating
speedto protect the engine and
all moving parts from damage
caused by overspeed.
Authorized service shall be
sought if a problem exists.

CARBURETOR/GOVERNOR
CONTROLADJUSTMENTS
Thecarburetor was adjusted at the factory
for best operating speed. Refer to the Engine Owner's Manualfor any adjustment
information or see your authorized engine
dealer.
The governor controls the maximum safe
operating speed and protects the engine
and all moving parts from damagecaused
by overspeeding. Do not tamper with the
engine governor settings.

If the engine muffler is equipped with a
spark arrester screen, remove and clean it
according to the service intervals and instructions in the Engine Owner's Manual.

When the tiller won't be used for an
extended period, prepare it for storage as
follows:
1. Cleanthe tiller and engine.
2. Do routine tiller lubrication and check
for loose parts and hardware.
3. Protect the engine and perform recommended engine maintenanceby following
the storage instructions found in the
Engine Owner'sManual. Besure to protect
the fuel lines, carburetor and fuel tank
from gum deposits by removing fuel or by
treating fuel with a fuel stabilizer (follow
engine manufacturer'srecommendations).
4. Store unit in a clean, dry area.
5. Neverstore the tiller with fuel in the fuel
tank in an enclosed area where gas fumes
could reach an open flame or spark, or
where ignition sources are present (space
heaters, hot water heaters, furnaces, etc.).

TROUBLESHOOTING
PROBLEM
Enginedoes not start

POSSIBLECAUSE

CORRECTION
Reconnectwire.

Spark plug wire disconnected.

Engine Throttle Control Lever incorrectly set.

Put lever in STARTposition.

Fueltank empty.

Add fuel.

Choke control (if so equipped) in incorrect position.

See Engine Owner's Manual.

Stale gasoline.

Drain fuel and add fresh fuel.

Dirty airfilter.

Clean or replace filter.

Defective or incorrectly gapped spark plug.

Inspect spark plug.

Carburetor out of adjustment.

See Engine Service Dealer.

Misadjusted throttle control.

See Engine Service Dealer

10. Dirt or water in fuel tank.

Enginerunspoorly.

Engineoverheats.

Enginedoesnotshotoff

Defective or incorrectly gapped spark plug.

Dirty airfilter(s).

Clean or replace (see Engine Owner's Manual).

Carburetor out of adjustment.

See Engine Service Dealer.

Stale gasoline.

Replacewith fresh gasoline.

Dirt or water in fuel tank.

See Engine Service Dealer.

Engine cooling system clogged.

Clean air cooling system (see Engine Owner's Manual).

Engine cooling system clogged.

Carburetor out of adjustment.

See Engine Service Dealer.

Oil level is low.

Check oil level (see Engine Owner's Manual).

Misadjusted throttle control or ignition switch.

See Engine Owner's Manual or Engine Service Dealer.

Improper use of controls.

Review Sections 3 and 4.

Worn, broken, or misadjusted drive belt(s).

See "Checking Drive Belt Tension," Section 5.

Internal transmission wear or damage.

Contact local dealer or the factory.

Bolt loose in transmission pulley.

Tighten bolt.

Wheel Drive Pins not in WHEEL DRIVE.

See "Wheel Drive Pins" in Section 3.

Bolt loose in transmission pulley.

Tighten bolt.

Internal transmission wear or damage.

Contact local Dealer or the Factory.

Tine holder mounting hardware missing.

Replacehardware.

Bolt loose in transmission pulley.

Tighten bolt.

Internal transmission wear or damage.

Contact local Dealer or the Factory.

Worn tines.

See "Bolo Tines" (Section 5).

Improper Depth Regulator setting.

See "Tilling Tips & Techniques," Section 4.

Incorrectthrottle setting.

See Section 4.

Forward Drive Belt slipping.

See "Checking Forward Drive Belt Tension," Section 5.

WheelsandTineswill notturn 1.

Tinesturn,butwheelsdon't,

WheelsTurn,butTinesDon't,

Poor tilling performance.

10. See Engine Service Dealer.
Inspect spark plug (see Engine Owner's Manual).

Clean air cooling area (see Engine Owner's Manual).

NOTES

Models643C, 643B & 645A

MODELS643C,643B & 645A

REF
NO.
1

PART NO.
686-04043
686-04041

710-0395

710-0597

710-0599

710-0874

710-3008

712-04063

712-04064

715-0108

732-04320

736-0275

750-04149

REF
NO.

DESCRIPTION

PART NO.

DESCRIPTION

TineHoodAssembly(A)
TineHoodAssembly(B)(C}
HexScrew,5/16-18x 2.25
HexHd.Screw,1/4-20x 1

732-04185

Spring, ForwardClutch

746-04208

CableAssembly, Forward Clutch

746-04058

747-04210

CableAssembly, ReverseClutch (B) (C)
Bail, ForwardClutch

31
32

749-04084
749-04208

Upper Handlebar
Lower Handlebar

749-04106

Tab, Conduit Mount

732-04040

Bracket, ReverseClutch Cable (B) (g)

786-04188

786-04200

Handlebar Support
Panel

710-0216

Screw, Hex, 3/8-16 x 3/4

38
39

710-0805
712-3000

Screw, Hex,5/16-18 x 1-1/2

736-0119

725-0157

Lock Washer, 5/16
CableTie

736-3050

FlatWasher, 3/8

712-04065

710-0347

FlangeLock Nut 3/8-16
Hex Hd. Screw, 3/8-16 x 1-3/4

45
46

710-0514
710-04048

Hex Hd. Screw,3/8-16 x 1, Grade5

742-04117

Single Bolo Tine - Left Hand

742-04116

Single Bolo Tine - Right Hand

686-04066

Tine Holder (A)

686-04065

Tine Holder (B) (C)

GW-1901

Bolo Tine Replacement Set (IncL eight

750-04160

750-04556

786-04092

786-04098

786-04104

786-04191

786-04290

786-04291

786-04292

710-0106

710-04163

712-3009

712-0121

Screw,Self-Tapping,I/4-20
x 1/2
mexHd.Screw,5/16-18x 1-1/4
mexHd.Screw,5/16-18x .75
HexLockNut,Nylon,5/16-18
HexLockNut,Nylon,1/4-20
SpirolPin
Spring,DepthRegulator
FlatWasher,5/16
Spacer,.462x .328x 1.63
Bushing
Spacer
ReverseStopArm
ChannelSupportBracket
DragBar
FlapStopBracket
HoodBracket,Left Hand
HoodBracket,RightHand
AdjustableDepthBar
HexHd.Screw,1/4-20x 1-1/4
Screw,#10-24x 2
HexLockNut,5/16-18
mexNut,#10-24

712-0291

HexLockNut,1/4-20

Hex Lock Nut, 3/8-16

FlangeScrew .312-18 x 1.00

right-hand tines, eight left-hand tines and
required hardware). (A)(B)(C)

(A) ForModel643C
(B) ForModel643B
(C)ForModel645A

MODELS643C,643B & 645A
REF
NO.
1
2
3
4
5

PARTNO.

GW-9517
GW-1714
GW-50043
711-04110
GW-1224-1
*
GW-1224-2"
GW-1224-3"
GW-1224-4"
GW-1325C

DESCRIPTION
Snap Ring
Bearing, Tapered Roller (with race)
Support Washer, Rear
Drive Shaft
Shim, RearBearing Cap, .010"thick
Shim, sameas above, except .030" thick
Shim, same asabove, except .005"thick
Shim, sameas above, except .062" thick
Shim Set (Incl. the following shims:
two #1224-1, two 1224-2 & one #1224-4)

* Useas required to obtain between .005" and .015" allowable end-play.

REF
NO.

PARTNO.

GW-9727

710-04049

736-0119

1918377

1916641

GW-50032

721-04030

721-04031

619-04013

721-04036

736-3008*

718-04008

710-04048

710-3008

DESCRIPTION
Plug,Transmission
Oil Fill
HexHd.FlangeScrew,5/16-18x 5/8,Gr.5
LockWasher,5/16
RearCover,Transmission
FrontCover,Transmission
Gasket,HousingCover
OilSeal,DriveShaft
OilSeal,WheelShaft
TransmissionRousingAssembly
OilSeal,TineShaft
Washer,Flat,.344x .750x.120
RearBearingCap
HexHd.FlangeScrew,5/16-18x 1
Hexmd.FlangeScrew,5/16-18x 3/4

*Includedwith transmissionwhenpurchasedasan assemblyonly.
Removeand discardwheninstallingthetransmissionon tiller.

MODELS643C,643B & 645A

2
3
4

FRONT
j/

7
4
3
2
REF
NO.
2
3

4
5

(A) ForModel643C
(B) ForModel643B
(C) ForModel645A

6
7
8
9
10
11

PARTNO.
1909950
GW-1166-1
*
GW-1166-2"
GW-1166-3"
GW-1166-4"
GW-1166-5"
GW-1086
711-04512
711-04486
GW-9305
GW-1132-2
1904278
711-04078
GW-1104
1916542

DESCRIPTION
Retainer,SnapRing
Shim,0.062"thick
Shim,0.030"thick
Shim,0.015"thick
Shim,0.010"thick
Shim,0.005"thick
BronzeBushing
WheelShaft(A)
WheelShaft(B) (C)
Key,Hi-Pro,1/4x 1
Spacer
WormGear,WheelShaft
TillerShaft
WoodruffKey
WormGear,TillerShaft

* Useas required to obtain between .005" and .030" allowable end-play.

MODELS643C,643B & 645A

Model 643C

MODELS643C,643B & 645A
REF
NO.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18

PARTNO.

REF
NO.

DESCRIPTION

27
28

736-0159

FlatWasher, 5/16

756-04198

Pulley, Engine Drive

656-04023

Transmission Pulley (A)

656-04005

Transmission Pulley (B} (C)

756-04169

Pulley, ReverseIdler (B) (C)

786-04095

PARTNO.

DESCRIPTION

736-0119

Lock Washer, 5/16 (A)

750-0535

Spacer,.380 IDx .625 OD x .21 (A)

736-3050
736-3090

FlatWasher .406 x .812 x .051 (B) (C)
FlatWasher

736-0452

BellWasher

Guard, Belts/Pulleys
Forward Drive Belt

710-0459A

HexHd. Screw, 3/8-24 x 1.50, GR5

736-04181

Support Washer

732-04085

Forward Return Spring

731-05268

ReverseDrive Belt (B) (C)
Belt Cover

786-04107

Bracket,Cable Mounting

732-04289

Reverse Return Spring (B) (C)

756-04170

Forward Idler Pulley

732-04081

714-0105

732-04079

Belt Guide (B) (C)
Belt Guide

736-3078

Key, 3/16" x 1"
FlatWasher

786-04068

Engine Bracket, Left

736-04193

BellevilleWasher

786-04069

Engine Bracket, Right

710-0805

HexScrew, 5/16-18 x 1.50 Gr5 (A) (B)

786-04070

Bracket, Belt Cover
Shoulder Washer

710-0395

HexScrew, 5/16-18 x 2-1/4, Gr5 (C)

712-04063

Nut, HexLock, 5/16-18

750-0258

Spacer,Shoulder (A)

736-0315

Washer, Flat, .75 x 1.5 x.125 (A)

754-04090
754-04091

748-04087
786-04276
786-04275

Reverse Idler Arm (B) (C)
Forward Idler Lever

710-0672

HexHd. Screw,5/16-24 x 1.25 (A)

710-0117

HexHd. Screw,5/16-24 x 1 (B) (C)

736-04192
736-0242

FlatWasher .786 x 1.000 x .031 (B) (C)
BellWasher

710-0237

HexHd. Screw,5/16-24 x 543

749-04193

Bumper (C)

710-0376

HexHd. Screw,5/16-18 x 1

726-0201

710-04049

HexHd. Screw,5/16-18 x 5/8

714-0143

Nut, Speed, 5/16-18 (C)
Klik Pin

710-0347

HexHd. Screw,3/8-16 x 1-3/4 (A)

734-04188

CompleteWheel Assembly 10 x 2.75 (A)

634-04232

CompleteWheel Assembly 13 x 5 x 6 (B} (C)
Rim Assembly (B) (C)
Tire (B)(C)

710-0520
23

710-0599

HexHd. Screw,3/8-16 x 1.50 (B) (C)
Screw, Self-Tapping, 1/4-20 x 1/2

710-3103

HexHd. Screw,5/16-18 x 2 (B) (C)

634-04218
734-0255

712-3000

Lock Nut, 3/8-16

734-04163

712-3009

Lock Nut, 5/16-18 (B) (C)

(A)ForModel643C
(B)ForModel643B
(C)ForModel645A

Air Valve (B} (C)

NOTES

TROY-BILT

TILLER

LIFETIME LIMITED WARRANTY

WHAT PRODUCT
IS COVERED

All Troy-Bilt branded rear tine walk-behind tillers with gear drive transmissions.
This warranty begins on the date of purchase and is warranted by Troy-Bilt LLC for the life of the
tiller, to the original purchaser only.

WHAT IS COVERED
BY THIS WARRANTY

Troy-Bilt LLC will, at its option, repair or replace any part found to be defective in material or
workmanship without charge for parts and labor
This limited lifetime warranty also applies to non-powered attachments and accessories.
Powered attachments and accessories are warranted separately by their manufacturers.
to the applicable manufacturer's warranty on these items for terms and conditions.

WHAT IS NOT
COVERED BY THIS
WARRANTY

Refer

This warranty does not apply to parts that have been damaged by accident, alteration, misuse,
abuse, neglect, improper maintenance, vandalism, theft, fire, water, or damage because of peril
or other natural disaster.
The following items are not covered after the first year of this residential use limited warranty:
belts, batteries, bushings, seals, tines, tires, wheels, paint, appearance items, and similar items
that are normally replaced through periodic maintenance.
Charges for pick-up, delivery, and service calls are not covered by this warranty.
Service completed by someone other than an authorized service dealer is not covered by this
warranty.
Parts that are not genuine Troy-Bilt LLC service parts are not covered by this warranty.
The engine is warranted separately by the engine manufacturer.
manufacturer's warranty for terms and conditions.

LIMITED
COMMERCIAL
USE WARRANTY

Refer to the engine

If used for commercial, institutional, industrial, rental, or demonstrator purposes, the warranty
on the tiller is limited in duration to 90 days from the date of purchase.
This warranty does not apply to parts that have been damaged by accident, alteration, misuse,
abuse, neglect, improper maintenance, vandalism, theft, fire, water, or damage because of
peril or other natural disaster.

HOW TO OBTAIN
SERVICE

Warranty service is available, with proof of purchase, through your local authorized service
dealer. To locate a dealer in your area, consult your Yellow Pages, or contact Troy-Bilt LLC at
P.O. Box 361131, Cleveland, Ohio 44136-0019, 1-866-840-6483, or log on to our Web site at
www.troybilt.com.

The provisions set forth in this warranty provide the sole and exclusive remedy arising from the sale. Troy-Bilt LLC shall
not be liable for any incidental or consequential damage or expense of any kind, including but not limited to cost of
equipment rental, loss of profits, or costs of hiring services to perform tasks normally performed by the equipment.
Any implied warranties, including any implied warranty of merchantability or fitness for a particular purpose, shall be limited
in duration to the period of ownership by the original purchaser (and a maximum of 90 days from the date of sale if the tiller is
purchased for commercial or other non-residential use).
Some states do not allow the exclusion or limitation of incidental or consequential damages, or limitations on how long an
implied warranty lasts, so the above exclusions or limitations may not apply to you.
This limited warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
For customer

TROY-BILT

assistance,

contact

LLC, P.O. Box 361131,

your nearest authorized

Cleveland,

dealer, or contact

Ohio 44136-0019,

us at:

1-866-840-6483

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Troybilt 21A 643B711 User Manual REAR TINE TILLER Manuals And Guides L0601227

TROYBILT Rear Tine, Gas Tiller Manual L0601227 TROYBILT Rear Tine, Gas Tiller Owner's Manual, TROYBILT Rear Tine, Gas Tiller installation guides

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