Troy-Bilt 21A-644A711 Rear-tine Tiller User Manual

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Operator's Manual

Rear-tine Tiller Models

640C-- Tuffy_ CRT

644A m Super Bronco TM CRT

Mode1644A Shown

IMPORTANT: Read safety rules and instructions carefully before operating equipment.

Warning: This unit is equipped with an internal combustion engine and should not be used on or near any unimproved 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 laws (if

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 required

by law (Section 4442 of the California Public Resources Code). Other states may have similar laws. Federal laws apply on federal lands. A spark

arrester for the muffler is available through your nearest engine authorized service dealer or contact the service department, P.O. Box 361131

Cleveland, Ohio 44136-0019.

Troy-Bilt LLC,P.O.BOX361131CLEVELAND,OHIO44136-0019

PRINTEDIN U.S.A. FORMNO. 769-00585C

9/15/04

TABLEOFCONTENTS

Content Page Content Page

Customer Support 2 Maintenance 17

Safety 3 Off-season Storage 21

Assembly 6 Troubleshooting 22

Features and Controls 10 Parts List 23

Operation 12 Warranty Back Cover

FINDINGMODELNUMBER

This Operator's Manual is an important part of your new lawn tractor. 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.

OTRDV-BILT T,OV-BmLTLLC

P. O. BOX 361131

www.troybilt.com CLEVELAND,OH44136

330-558-7220

,. 1-800-520-552_

Copy the model number here:

Copy the serial number here:

CUSTOMERSUPPORT

PleasedoNOTreh/m thel/nit totheretailer withoutfirstcontactingCustomerSupport.

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.

/;/ ,> ;'V }/ )

..... f ; @; t ;D

j;_ ?" #'s " 4t, ' F_ i/!s ,

* ;,, #FOX }_ j,"

,v yO, ,_;7f'_;:'

_ 7>,,,,

,,, >,, rL;," ¢j ,_ <# ft, *x J ,7;; _

'_,-., _tf';_'ivc ,l

If you prefer to reach a Customer Support Representative, please call 1(800) 520-5520.

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 stan-

dard B71.8-1996, which is sponsoredbythe

Outdoor Power Equipment Institute, Inc.,

and is published by the American National

Standards Institute.

WARNING

The engine exhaust from this productcontains

chemicals known to the State of California to

cause cancer, birth defects or other reproduc-

SafetyAlertSymbol

,_ This is a safety alert symbol. It is used

in this manual and on the unit to alert

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.

ForwardClutchBail

ReverseClutchControl

(Models644A)

DepthRegulator

TineHoodFlap

Standard-Rotating-Tines

(CRT)

DrivePin

Figure 1-1:Tiller featuresand contre/s. See separateEngineOwner'sManua/ to

identifyenginecontre/s.

Training

1. Carefully readthis Own-

er's Manual,the separate

Engine Owner'sManual,

and anyother literature you may receive.

Bethoroughly familiar with the controls

andthe proper useofthe tiller and its en-

gine. Knowhowto stop the unit and disen-

gagethe controls quickly.

2. Neverallowchildrento operatethetiller.

Neverallow adults to operatethe tiller

without proper instruction.

3. Keepthe area of operationclear of all

persons, particularly children and pets.

4. Keepin mindthat theoperatoror useris

responsible for accidents or hazardsoc-

curring to otherpeople,their property,and

themselves.

Preparation

1. Thoroughly inspect the areawherethe

tiller is to be usedand removeall foreign

objects.

2. Be sure all tiller controls are released

and bothwheels arein theWheelDrive po-

sition beforestarting the engine.

3. Donot operatethetiller without wearing

adequateoutergarments. Avoid loosegar-

ments or jewelry that could get caught in

moving parts.

4. Donot operatethe tiller when barefoot

or wearingsandals,sneakers,or light foot-

wear.Wear protective footwear that will

improve footing on slippery surfaces.

5. Donottill nearunderground electricca-

bles,telephone lines, pipes or hoses.If in

doubt, contact your telephoneor utility

company.

6. Warning: Handlefuel with care; it is

highly flammableand its vapors areexplo-

sive.Takethe following precautions:

a. Storefuel in containers specifically

designedfor this purpose.

b. Thegascapshallneverberemovedor

fueladdedwhiletheengineisrunning.

Allowthe engineto coolforseveral

minutesbeforeaddingfuel.

c. Keepmatches,cigarettes, cigars,

pipes, openflamesand sparksaway

from thefueltank and fuelcontainer.

d. Fillfuel tank outdoors with extreme

care.Neverfill fueltank indoors. Use

a funnelor spout to preventspillage.

e. Replaceall fueltank and container

caps securely.

f. Iffuel isspilled, do not attempt to

start the engine,but move the ma-

chineawayfrom the areaof spillage

and avoidcreating any source of ig-

nition until fuel vapors havedissi-

pated.

7. Nevermakeadjustmentswhenengineis

running (unless recommendedby manu-

facturer).

Operation

1. Do not put hands or feet near or under

rotating parts.

2. Exerciseextremecaution when on or

crossing gravel drives,walks, or roads.

Stayalert for hiddenhazardsor traffic. Do

not carry passengers.

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 inspectthe ma-

chine for any damageand repairthe dam-

agebefore restarting and operatingthe

machine.

4.Exercisecautiontoavoidslippingorfall-

ing.

5.Iftheunitshouldstarttovibrateabnor-

mally,stoptheengine,disconnectthe

sparkplugwireandpreventitfromtouch-

ingthesparkplug,andcheckimmediately

forthecause.Vibrationisgenerallya

warningoftrouble.

6. Stopthe engine, disconnectthe spark

plug wire and prevent it from touching the

spark plug,wheneveryou leavethe operat-

ing position, beforeunclogging thetines,

or whenmaking any repairs, adjustments

or inspections.

7. Takeall possible precautionswhenleav-

ing the machine unattended.Stopthe en-

gine. Disconnectthespark plug wire and

move it awayfrom thespark plug. Besure

that both wheelsarein theWheelDrive po-

sition.

8. Beforecleaning, repairing,or inspect-

ing, stop the engine and make certain all

moving parts havestopped. Disconnect

the spark plug wire and prevent it from

touching thespark plugto preventacci-

dentalstarting.

9. Theflapon thefine hood must bedown

when operatingthetiller.

10. Neverusethetiller unless proper

guards, plates,or other safety protective

devicesare in place.

11. Donot run the engine in an enclosed

area.Engineexhaust containscarbon

monoxide gas, a deadlypoison that is

odorless, colorless, and tasteless.

12. Keepchildren and pets away.

13. Never operate thetiller underengine

powerif thewheels arein theFreewheel

position.Inthe Freewheelposition, the

wheelswill not hold the tiller back andthe

revolvingtines could propel thetiller rapid-

ly,possibly causingloss ofcontrol. Always

engagethe wheels with the wheel drive

pins in theWheel Drive position before

starting the engine or engaging the

tines4Nheelswith the Forward Clutch Bail

(all models)or the ReverseClutchcontrol

(Model 644A only).

14. Beawarethatthe tiller may unex-

pectedlybounceupwardor jumpforward

if thetines shouldstrike extremelyhard

packedsoil, frozen ground,or buriedob-

stacleslike largestones,roots,or

stumps.

If indoubtaboutthetilling conditions, al-

ways usethefollowing operating precau-

tionstoassistyouin maintainingcontrol

of thetiller:

a. Walk behindandto one side of the

tiller, usingone handon thehandle

barsRelax yourarm, but usea

securehandgrip.

b. Useshallowerdepthregulator

settings,working graduallydeeper

with eachpass.

¢. Useslowerenginespeeds.

d. Clearthetilling area of all large

stones,rootsor other debris.

e. Avoidusingdownwardpressureon

thehandlebars.If needbe, use

slight upwardpressuretokeepthe

tinesfrom diggingtoodeeply.

f. Beforecontacting hardpackedsoil

at the endofa row,reduceengine

speedand lift thehandlebarsto

raise thetines out of the soil.

g. In anemergency,stopthetinesand

wheels byreleasingwhichever

clutch controlis engaged.Do not

attemptto restrainthetiller.

15. Donot overloadthe tiller's capacityby

attempting to till too deeplyat too fast a

rate.

16. Neveroperatethetiller at high trans-

port speeds on hard or slippery surfaces.

Look behind and usecarewhen backing

up.

17. Donot operatethetiller on aslopethat

is too steep for safety.When on slopes,

slow down and makesure you havegood

footing. Neverpermit thetillerto freewheel

down slopes.

18. Neverallow bystanders nearthe unit.

19. Onlyuseattachmentsand accessories

that are approved bythe manufacturer of

the tiller.

20. Usetiller attachmentsand accessories

when recommended.

21. Neveroperatethetiller without good

visibility orlight.

22. Neveroperatethe tiller ifyou aretired;

or underthe influence ofalcohol, drugs or

medication.

23. Operatorsshallnottamper with theen-

gine-governor settings onthe machine;

the governor controls the maximum safe

operatingspeedto protectthe engine and

all moving parts from damagecaused by

overspeed.Authorized serviceshall be

sought if a problem exists.

24. Do nottouch engine parts which may

behot from operation.Letparts cool down

sufficiently.

25. Pleaseremember:Youcanalwaysstop

thetines and wheels by releasingthe For-

ward ClutchBail or on Model644Athe Re-

verseClutchcontrol, (whichevercontrol is

engaged),or bymoving the ignition switch

and/orthrottle control leveron the engine

to "OFF"or "STOP".

26. Toload or unloadthe tiller, seethe in-

structions in Section4 of this Manual.

27. Useextremecaution when reversing

or pulling the machinetowards you.

28. Startthe enginecarefully accordingto

instructions and with feetwell awayfrom

thetines.

29. Neverpick up or carry a machinewhile

the engineis running.

MaintenanceandStorage

1. Keepthe tiller, attachmentsand acces-

sories in safeworking condition.

2. Checkall nuts, bolts, and screws for

proper tightness to besurethe equipment

is in safeworking condition.

3. Neverstore thetiller with fuel in thefuel

tank insidea building whereignition sourc-

esare presentsuchashot waterandspace

heaters,furnaces, clothes dryers, stoves,

electric motors, etc.). Allow the engineto

cool beforestoring the unit in anyenclo-

sure.

4. Toreducethe chancesof a fire hazard,

keeptheenginefreeofgrass, leaves,or ex-

cessivegrease.

5. Storegasolinein acool, well-ventilated

area,safelyawayfrom anyspark- or

flame-producing equipment. Store gaso-

line in an approvedcontainer,safelyaway

from the reachof children.

6. Referto the Maintenancesections of

this Manualand the separateEngineOwn-

er'sManualfor instructions ifthe unitis to

bestored for an extendedperiod.

7. Neverperform maintenancewhilethe

engineis running orthe spark plug wire is

connected,exceptwhen specifically in-

structed to do so.

8. Ifthe fueltank hasto be drained,dothis

outdoors.

Decals

Foryour safety and the safety of others, vari-

ous safety and operationaldecalsare located

on your unit (seeFigure 1-2).

Keepthe decalscleanand legibleatall times.

Contactyour localservicedealeror thefactory

for replacementsif anydecalsaredamagedor

missing.

Referto the Parts List pagesin this Manualfor

decallocations, descriptions and part num-

bers.

ForwardClutchBail

StartingStabilization

Message(on engine)

ReverseClutch Control

OperatingInstruction

(Models 644A)

WarningMessages

HotSurfacesWarning

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

OperatingSymbols

Varioussymbols(shownhere,withworddescriptions)

mayheusedonte'dllerandengine.

NOTE:Yourunitmaynothaveallof_esymbds.

FAST SLOW STOP

I"1 I*1 R

CHOKE CHOKE REVERSE

ON OFF ROTATINGTINES

<,-K,

TILLERDIRECTION

<--o-->

LEVERDIRECTION

BAIL

ENGAGED

BAIL

DISENGAGED

TO AVOID SERIOUS INJURY:

* READTHEOWNER'SMANUAL.

* KNOWLOCATIONSANDFUNCTIONSOFALLCONTROLS.

* KEEPALLSAFETYDEVICESANDSHIELDSIN PLACEANDWORKING.

° NEVERALLOWCHILDRENORUNINSTRUCTEDADULTSTO OPERATETILLER.

° SHUTOFFENGINEAND DISCONNECTSPARKPLUGWIREBEFOREMANUALLYUN-

CLOGGINGTINESORMAKINGREPAIRS.

° KEEPBYSTANDERSAWAYFROM MACHINE.

° KEEPAWAYFROMROTATINGPARTS.

° USEEXTREMECAUTIONWHENREVERSINGOR PULLINGTHEMACHINETOWARDS

YOU.

SECTION2: ASSEMBLY

WARNING: Toprevent

personalinjury or property

damage,do notstartthe engine

until all assemblysteps are

completeandyou haveread

and understandthesafety and

operatinginstructions in this

manual.

INTRODUCTION

Carefullyfollow these assemblysteps to

correctly prepareyour tiller for use. It is

recommendedthatyou readthis Sectionin

its entirety beforebeginning assembly.

NOTE: Various rifler 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 unitand carton for damageim-

mediatelyafter 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 writ-

ing and maila copyto the carrierwithin 15

days after the unit has beendelivered.

ContactTroy-Bilt LLCif you needassis-

tance in this matter.

TOOLS/ MATERIALSNEEDED

(2) 1/2" open-end wrench*

(2) 9/16" open-endwrench*

(1) 3/8" open-endwrench*

(1) Largeadjustable wrench

(Models 644A only)

(1) Scissors (totrim plasticties)

(1) Ruler (for belttension check)

(1) Block of wood (to support tiller when

removing wheels)

(1) Tirepressure gauge (for models with

pneumatictires)

(1) Cleanoil funnel

(1) Motor oil. Refertothe EngineOwner's

Manualfor oil specificationsand

quantityrequired.

* Adjustable wrenchesmay be used.

ASSEMBLYSTEPS

STEP 1: UNPACKING INSTRUCTIONS

NOTE:While unpacking,do not severely

bend anycontrol cables.

1.Thetiller weighs approximately 133 Ibs.

Do notattempt to remove it from the ship-

ping platform until instructed to do so in

these Assembly steps.

2. Removeany packagingmaterial from

the carton. Removeany staplesfrom the

bottom of the carton and removethe car-

ton from the shipping platform.

3. Removeall unassembledparts andthe

separatehardwarebag from the carton.

Checkthat you havethe items listed in the

LooseParts List (contactyour localdealer

or the factory itemsare missing or dam-

aged).

NOTE: Use the screw length template

(Fig,2-1) to identify screws,

LoosePartsList

Qty. Description

1 HandlebarSupport (seeA, Fig. 2-2)

1 HandlebarAssembly(seeK,Fig.2-2)

Hardwarebag contents:

4 Hexhd. screw, 5/16-18 x 1-1/2"

2 Hexhd. screw, 3/8-16 x 3/4"

2 FlatWasher,3/8"

4 Split lockwasher,5/16"

4 Hex nut, 5/16"-18

2 HexIocknut, 34}"-16

*Model 644A only

IMPORTANT:Motor oil must beaddedto

the enginecrankcasebeforetheengine is

started. Followthe instructions inthis

Sectionand in the separateEngine

Owner's Manual.

NOTE: LEFTand RIGHTsides of thetiller

are as viewedfrom theoperator's position

behind thehandlebars.

STEP 2: ATTACHHANDLEBAR

1. Looselyattachthe legsof thehandlebar

support (A, Fig. 2-2) to the inner sides of

the tiller frame usingtwo 3/8"-16x3/4" hex

hd. screws (B), 3/8" flat washers(C), and

3/8"-16 hex Iocknuts (D).

_iiii

Figure2-1: Toidentifylengthofscrews,place

screwontemplateasshownandmeasuredis-

tancebetweenbottomofscrewheadandtipof

screw.

2. Usingtwo 5/16"-18 x 1-1/2"screws (G),

5/16" split lock washers (H) and 5/16"-18

hexnuts (I), looselyattachthe handlebar

support (A) usingthe upperholes.Tighten

thetwo screws securely.

3. Therearethree heightadjustmentholes

in the two handlebar support brackets (E

and F,Fig. 2-2). Usea setting that will po-

sition the handlebarsat approximately

waist levelwhenthetines are3"-4"intothe

soil. Looselyattachthesupport bracketsto

theoutsideofthe handlebarassembly (K)

usingtwo 5/16"-18x 1-1/2" screws (G),5/

16"split lockwashers(H)and5/16"-18 hex

nuts (I). NOTE:Ifa support bracketwill not

move, loosenattaching screw (J) and nut.

IMPORTANT:The support bracketsmust

beassembledtotheoutsideofthe

handlebarassembly.

4. Tightenall handlebarmounting hard-

waresecurely.

STEP 3: MOVE TILLER OFF CRATE

Toroll the tiller off the shipping platform,

put the wheels in freewheel,asfollows:

1. Placeasturdy block underthetransmis-

sion to raiseone wheelabout 1" off the

ground.

2, Removethe hairpin cotter (L, Fig.2-3)

and wheeldrive pin (M) from the wheel

hub (0) and wheelshaft (N).

3. Slidethe wheelfully inwardonthewheel

shaft (N, Fig.2-3). Reinstallthe wheel

°-! °

Fig. 2-3: Wheel in FREEWHEELposition

STEP 4: INSTALL FORWARD

CLUTCH CABLE

1. Carefullyunwrapthe forward clutch ca-

ble(cablewithout an attachedknob) from

its shipping position and slide thethin ca-

blewire (T,Fig. 2-4) into the slot in the ca-

blebracket. Pushthe cableconnector (U,

Fig.2-4) upthrough the holein thebracket

untilthe groove in the connector snaps

into place.

2. Threadthe#10-24 hexnut (Z, Fig. 2-5)

halfway ontothe screw (V) which runs

through the spring (W, Fig.2-5).

3. Threadthe screw (V) into the cablead-

juster (X).

Fig. 2.2: Attachhandlebar.

drive pin (M) through thewheelshaft only

(not through the wheelhub). Securethe

wheeldrive pin with the hairpin cotter (L),

pushingthe hairpincotter in asfarasit will

go. Thewheelshould now spin freely

(freewheel) on the wheelshaft. Repeat

with the other wheel.

4. Usethe handlebarto roll the tiller to a

flat area.

IMPORTANT: Beforestartingthe engine,

the wheels must beplacedin theWHEEL

DRIVEposition (pinsthrough wheelhubs

andwheelshaft). This procedureis

describedin WheelDrivePinsin Section3.

Fig. 2-4: Installingforward clutchcable bracketand cable.

4. Checkfor correcttension ontheforward

drive belt bytaking two measurementsof

the cablespring, as follows:

a.With the Forward Clutch Bail (Y,Fig. 2-

6) in an open (released)position, measure

the length ofthecablespring (W) from the

outermost coil to the outermost coil.

b. Squeezethe ForwardClutch Bailagainst

the handlebar(seeFig. 2-7) and re-mea-

surethe spring length. Thebelt tension is

correct if this second measurementis be-

tween 1/16"to 3/16" longerthanthe first

measurement.If so, turn the hexnut (Z,

Fig. 2-7) tightly against the cableadjuster

(X) while preventingthe cableadjuster

from turning.

c. If the spring lengthis incorrect, you

must adjustthe cabletension asdescribed

in Checkingand Adjusting Forward Drive

Belt Tensionin Section5. Incorrect cable

tension can result in beltslippage (cable

tension too loose), or unintentional tine

movement whenthe clutch bail is in Neu-

tral (cabletension too tight).

Fig.2-5: Cable

springand

adjuster.

Fig. 2-6: Attachforward

clutchcablespringto

forwardclutch bail.

iiiiiiiiiiiiiiii

Fig. 2-7: Tocheckforwardbelt tension,take twomeasurementsof thelengthofthe coils inthe

spring-- first withthebail open, then withthe bail heldagainst thehandlebar.

STEP 5: INSTALL REVERSECLUTCH

CABLE (MODEL 644A ONLY)

1. Unwrapthe reverseclutch cable (CC,

Fig.2-8 and Fig.2-9) from itsshipping po-

sition and route it up to the handlebar.Be

surethat the cableis routedbeneaththe

Forward Clutch Bail.

2. Insertthecable(CC,Fig.2-8)through the

slot inthecablebracketandpositiontheflat

sideof thethreadedassemblynextto the

flat side ofthe hole.Slidethe hexnut (DD)

up thecableandtighten it securely.

3. Fastenthe reverseclutch cableto the

left sidehandlebarwith acabletie (EE,Fig.

2-9).

4. Testthefunction ofthe reverseclutch by

pulling out and releasingthe cableknob.

Theknob should return to its neutral posi-

tion (resting against bracket). If it doesn't,

contact your local dealeror Troy-Bilt LLC

for technical assistance.

Flat Side

Fig. 2-8:/nsta//reverse cablebracketand

reverseclutchcable.

Fig. 2-9: Routereverseclutchcable (CC)as

shown.Attachwithcable tie(EE).

5! 6: CHECKTRAHSMiSSiOH

OILLEVEL

Thetransmission was filledwith gearoil at

thefactory. However,you shouldcheckthe

gear oil levelatthis time to makecertain it

is correct.

IMPORTANT:Donot operatethe tiller ifthe

gear oil level islow. Doingso will result in

severedamageto the transmission com-

ponents.

1. With the tiller on levelground, pull the

Depth RegulatorLever(FF,Fig. 2-10) back

andthen all theway up until the lowest

notch in the lever isengaged.

2. Removethe oil fill plug (GG,Fig.2-11)

from the transmission housing cover and

locatethe maindrive shaft situated inside

the housing.

3. Thegear oil leveliscorrect ifthegear oil

isapproximately halfway upthe sideofthe

main driveshaft.

4. Ifthe oil levelislow, add gear oil by re-

ferring to A. ToCheckthe Transmission

dear 0il Levelin Section5.

I El-'/: AUU IVlUI UH UIL

Thetiller isshipped withoutoil in the en-

gine.

IMPORTANT:Donot start the engine with-

out first adding motor oil. Severeengine

damagewill result ifthe engineis run with-

out oil.

1. Referto the separateEngineOwner's

Manualfor engine oil specifications and

capacities.

2. With thetiller on levelground, movethe

Depth RegulatorLever(FF,Fig.2-10) upor

down until the engine is level.

3. Add motor oil as describedin the En-

gine Owner's Manual.

4. Movethe DepthRegulator Leverall the

way down untilthe highest notch is en-

gaged.This placesthe tines in the"travel"

position, which allows the tiller to be

moved without thetines touching the

ground.

_1 El-'8: I.;HEI.;K HAHUWAHE

Checkall nutsandscrews for tightness.

STEP g: CHECKAIR PRESSURE IN

TIRES (unitswithpneumatictires)

Checkthe air pressurewith a tire gauge.

Deflateor inflatethe tires equallyto be-

tween 15 PSIand 20 PSI (pounds per

squareinch). Besurethat bothtires arein-

flated equallyor the unit will pull to one

side.

Fig. 2-10: AdjustDepthRegulatorLever.

Fig. 2-11: Removegear oil fill plug.

IMPORTANT: This completesthe assembly steps. Be-

fore operatingyour tiller, makesureyou readthefollow-

ing sections in this Manual,as well asthe

separateEngineOwner'sManual:

• Section 1: Safety

• Section 3: Featuresand Controls

• Section 4: Operation

SECTION3: FEATURESANDCONTROLS

_ ARNING: Before

operatingyour machine,

carefully readand understand

all safety,controls and

operatinginstructions in this

Manual,the separateEngine

Owner's Manual,andon the

decalson the machine.

Failureto follow these

instructions can result in

serious personalinjury.

INTRODUCTION

This Section describesthe location and

function ofthecontrols on yourtiller. Refer

to the following Section, Operationfor de-

tailed operatinginstructions.

Practice usingthese controls, with the en-

gine shut off, until you understandthe op-

eration ofthe controls and feelconfident

with eachof them.

ForwardClutch

Bail ReverseClutchControl

(Model 644A)

gulator

HandlebarHeight Adjustment

Wheel Drive Pin

(oneachwheel)

ENGINE CONTROLS

Referto the enginemanufacturer's Engine

Owner'sManual(included in the tiller liter-

aturepackage)to identify the controls on

your engine.

IMPORTANT:Thecontrol for stopping the

engine is located onthe engine.

WHEEL DRIVE PINS

Eachwheelis equippedwith a wheeldrive

pin (A, Figures3-2 and 3-3) that secures

the wheelto the wheelshaft (B). The

wheelscan be positioned in either a

WHEELDRIVEor aFREEWHEELmode.

_ WARNING: Neverallow

either ofthewheelsto bein the

FREEWHEELposition whenthe

engineis running. Alwaysput

both wheelsin theWHEEL

DRIVEposition beforestarting

the engine.

Failureto comply could cause

loss of tiller control, property

damage,or personalinjury.

Beforestartingthe engine,put bothwheels

in the WHEELDRIVEposition byinserting

the wheel drive pins through the wheel

hubsandthewheelshaft. Doingso "locks"

the wheels to the wheelshaft, causing the

wheelsto turn when eitherthe

Figure3-1: Tiller features and controls.See separateEngineOwner's Manual to identify

enginecontrols.

Forward ClutchBail (all models) or the Re-

verse ClutchControl (Model 644A) is en-

gaged.

Usethe FREEWHEELmode only whenthe

engineis not running, in FREEWHEEL,the

wheeldrive pins are placedonly through

the holes in thewheelshaft (notthe wheel

hubs), thus allowing the wheels to turn

freely whenyou manually movethe tiller.

Toplacethewheels in WHEELDRIVEor

FREEWHEEL:

1. Stopengine,disconnectsparkplug wire

from sparkplug andallowengineto cool.

_ WARNING: Donotplace

tiller on its sidewhenchanging

wheeldrivepositions. Doingso

could result in gasolineleaking

from the fuel tank.

Failureto follow this instruction

could result in personalinjury

or property damage.

2. Raiseone wheelabout oneinch off the

ground and placeasturdy support under

the transmission.

3. Removehairpin cotter (C,Figures3-2

and 3-3) from wheel drive pin (A).

4. FORWHEELDRIVEMODE(Figure3-2):

Slide wheeloutward and align holes in

Figure3-2: WHEELDRIVEposition.

wheelhub (D, Figure3-2) and wheel

shaft (B). Insertwheel drive pin (A)

through wheel hub (D)and wheel

shaft (B). Securewheeldrive pin with hair-

pin cotter (C) by pushing hairpin cotter in

asfar as it will go. Repeatwith the other

wheeland then removethe support from

beneaththe transmission.

5. FORFREEWHEELMODE(Figure3-3):

Slidethewheelinwardandinsertthewheel

drive pin (A, Figure3-3) onlythrough the

hole in the wheel shaft (B). Securewheel

drivepin with hairpincotter (C)bypushing

hairpin cotter in asfar asit will go. Repeat

for the other wheeland then removethe

support from beneaththetransmission.

_ WARNING: Useextreme

_--'i_ caution whenreversing or

pulling the machinetowards

,,_- D you. Look behindto avoid

obstacles.

Neverattemptto till in reverse.

Failureto follow thiswarning

could result in personalinjury

or property damage.

Tooperatethe ReverseClutchControl:

1. Putwheels in WHEELDRIVEposition

(see"WARNING"statementat the left).

2. Stopall tiller motion by releasingthe

Figure3-3:FREEWHEELposition.

Forward Clutch Bail.

WARNING: Beforestarting 3. Lift the handlebar untilthe tines clear

engine,besurethat both the ground, look behind you to avoid any

wheelsare inWHEELDRIVE obstacles,and then pull the control knob

position. SeeWheelsDrivePins (F,Figure3-4) out. Thewheels and tines

for instructions, will rotate in a reversedirection.

Engagingthe Forward Clutch 4. Releasethe control knobto disengage

Bail or ReverseClutchControl (stop)thewheels andtines (theenginewill

(if equipped) whenthewheels continue to run).

arenot in WHEELDRIVEcould

allowthe tinesto rapidly propel

the tiller forward or backward.

Failureto comply could cause

loss of tiller control, property

damage,or personalinjury.

FORWARDCLUTCHBAIL

TheForward Clutch Bail(E, Figure3-4)

controls the engagementof forward drive F

to the wheelsand tines. E

Tooperate the ForwardClutchBail:

1. Put wheelsin WHEELDRIVEposition Figure3-4:AIImodelshavea ForwardClutch

(see"WARNING"statementabove). Bail(E).OnlyMode1644Ahavea Reverse

ClutchControl(F).

2. Lift and hold the clutch bail (E,Figure3-

4)againstthehandlebartostartthewheels DEPTH REGULATOR LEVER

andtines rotatingin a forward direction.

This lever (G,Figure3-5) controls the till-

3. Releasethe clutch bail to disengage ing depthof the tines. Pullthe leverback

(stop) thewheels andtines (theenginewill and slide it up or downto engagethe

continue to run). notched height settings.

REVERSECLUTCHCONTROL The"travelposition" (highestnotch) raises

(Model 644A only) the tines approximately1-1/2"off the

ground, allowingthe tiller to be moved

TheReverseClutchControl (F,Figure3-4) without the tines contactingthe ground.

controls the engagementof reversedrive This setting should also be usedwhen

to the wheelsandtines.The reversing fea- starting the engine.

ture isusedfor maneuveringthe tiller

only-- neverengagethetines in the Moving the leverupward will increasethe

tilling depth.Thelowest notchallowsatill-

ground while operatingin reverse.

ing depthof approximately6", depending

on soil conditions. Forbest results,always

begintilling atavery shallow depthsetting

and gradually increasethe tilling depth.

_b ARNING: Donotattempt

to till too deeplytoo quickly.

Graduallywork downto deeper

tilling depths.

Placethe DepthRegulator

Leverin the "travel" position

beforestarting theengine.This

position preventsthetines from

touching the ground untilyou

are readyto begintilling.

Failureto follow thiswarning

could result in personalinjury

or property damage.

TravelPosition

Figure3-5: DepthRegulator Lever (G).

HANDLEBARHEIGHT ADJUSTMENT

Thehandlebarheight isadjustabletothree

different settings (Figure3-6). In general,

adjust the handlebarssothey areat waist

levelwhenthe tines are3"-4"in the soil.

Toadjustthe handlebars:

1. Stopengine,disconnectspark plugwire

from spark plug and allow engineto cool.

2. Removehardware,reposition handle-

bars,and reinstall hardwaresecurely.

High

Medium

Figure3-6: Handlebarheightadjustment.

SECTION4: OPERATION

_ ARNING: Before

operatingyour machine,

carefully readand understand

all safety (Section 1),controls

(Section 3) and operating

instructions (Section4) inthis

Manual,the separateEngine

Owner's Manual,andon the

decalson the machine.

Failureto follow these

instructions can result in

serious personalinjury.

INTRODUCTION

Readthis OperationSection andthe sepa-

rate EngineOwner'sManualbeforeyou

start the engine.Then,take thetime to fa-

miliarize yourself with the basic operation

of thetiller before usingit in the garden.

Findan open,levelareaand practice using

the tiller controls without thetines engag-

ing the soil (put tines in "travel" setting).

Onlyafter you've becomecompletely fa-

miliar with thetiller shouldyou beginusing

it in the garden.

BREAK-INOPERATION

Perform the following maintenanceafter

the first two (2) hours of new operation

(see MaintenanceSection in this manual

and in the Engine Owner'sManual).

1. Changeengine oil.

2. Checkfor looseor missinghardwareon

unit. Tighten or replaceas needed.

3. Checktension on forward drive belt.

4. Checktransmission gear oil level.

STARTING AND STOPPING

Pre-StartChecklist

With the spark plug wire disconnected

from the sparkplug, perform the following

checksand services beforeeachuse:

1. Readthe Safetyand Controls Sections

in this manual.Readthe separateEngine

Owner's Manualprovidedwith the unit.

2. Putthe wheels inthe WHEELDRIVEpo-

sition (wheel pins must be through holes

in wheelhubs and wheelshaft).

3. Checkunit for loose or missing hard-

ware. Serviceas required.

4. Checkengineoil level.SeeEngineOwn-

er's Manual.

ReverseClutchControl

(Model644A)

ClutchBail

,epthRegulator

DrivePin

Fig. 4-1

5. Checkthat allsafetyguards andcovers

are in place.

6. Checkair cleanerand engine cooling

system. SeeEngineOwner's Manual.

,_ WARNING: GASOLINEIS

HIGHLYFLAMMABLEAND ITS

VAPORSAREEXPLOSIVE.

Followgasolinesafety rulesin

this Manual(seeSection 1)and

in theseparateEngineOwner's

Manual.

Failureto follow gasolinesafety

instructions can result in

serious personalinjury and

property damage.

7. Fillthefueltank with gasolineaccording

to the directions inthe separate Engine

Owner's Manual.Follow all instructions

and safety rules carefully.

8. Attachspark plug wire to spark plug.

Startingthe Engine

Thefollowing steps describe how to start

and stop the engine.

,_ WARNING: Donotattempt

to engagethetines or wheels

until you havereadall ofthe

operatinginstructions in this

Section.Also, reviewthe safety

rules in Section 1:Safety,and

the tiller and enginecontrols

information in Section3:

Featuresand Controls.

1. Completethe Pre-StartChecklistonthis

page.

2. Putthe wheels inthe WHEELDRIVEpo-

sition (seeWheelDrivePinsin Section3 of

this manual).

,_ WARNING: Tohelp

preventserious personalinjury

or damageto equipment:

• Before starting engine, put both

wheels in the WHEELDRIVEposition.

Never havewheels in FREEWHEELpo-

sition when engine is running. When

thewheels arein FREEWHEEL,theydo

not hold backthe tiller and the tines

couldpropelthetiller rapidly

forwardor backward.

• Before starting engine, put Forward

Clutch Bail (all models) and Reverse

Clutch Control (Model 644A only) in

neutral (disengaged) positionsby re-

leasinglevers.

• Never run engine indoors or in en-

closed,poorlyventilatedareas. Engine

exhaustcontainscarbonmonoxide,an

odorlessanddeadlygas.

• Avoidenginemufflerandnearbyareas.

Temperaturesin these areas may ex-

ceed 150° F.

3. Movethe Depth RegulatorLeverall the

way down to the "travel" position, sothat

thetines clearthe ground.

4. Releaseall controls on the tiller.

5. Onengine'swith a fuel shut-off valve,

turn valve to openposition, asinstructed

in the separateEngine Owner'sManual.

6. Put ignition switch and/or throttle con-

trol leverlocated on engine in the "ON",

"RUN", "FAST"or "START"position, asin-

structed in the EngineOwner's Manual.

7. Chokeor prime engine,as instructed in

EngineOwner's Manual.

8. Put one hand on fueltank to stabilize

unitwhen pulling starter ropehandle.Then

userecoilstarter to start engine,as in-

structed in the EngineOwner's Manual.

Whenenginestarts, graduallymove choke

lever (if so equipped) to "NO CHOKE",

"CHOKEOFF"or "RUN" position.

9. Usethe "FAST"throttle speedsetting

whentilling.

Stopping the Engineand Tiller

1. Tostop thewheelsandtines, releasethe

Forward ClutchBail (all models) orthe Re-

verse ClutchControl (Model 644A) --

whichevercontrol is in use.

2. Tostop the engine,put the ignition

switch and/or thethrottle control leverin

the "OFF"or "STOP"position.

OPERATINGTHETILLER

Thefollowing operatinginstructions pro-

videguidelinesto usingyour tiller effec-

tively and safely. Besure to read Tilling

Tips & Techniquesin this Section before

actually putting the tines into the soil.

This is a "Counter-Rotating-Tine" (CRT)

tiller. It operatesdifferently from "Stan-

dard-Rotating-Tine" (SRT)tillers. As the

wheels pull forward, the tines rotateback-

ward, creating an "uppercut" action which

digs deeply, uprooting soil and weeds.

1. Followthe Pre-Start Checklistatthe be-

ginning of this Section. Besurethat the

wheelsare in theWHEELDRIVEposition.

2. Movethe DepthRegulator Leverall the

way down, so that thetines clearthe

ground. Usethis position when practicing

with thetiller and when traveling between

tilling sites. Beforeactuallytilling, move

the leverto the desireddepth setting (see

Tilling Tips & Techniques).

Fig.4-2:Useonehandtoguidetillerwhen

movingforward.

3. Start engineand allow it to warm up.

Thenput throttle in "FAST"setting.

4. Forforwardmotion ofthe wheels and

powerto thetines:

(a) Pull Forward Clutch Bail (Fig.4-1) up

against handlebar.Releasebail to stop for-

ward motion of wheels and tines.

(b) Whentilling, relaxand letthe wheels

pull the unit while thetines dig.Walk be-

hind anda little to onesideof the unit. Use

one hand,yet keepa light--but secure--

grip on the handlebar (while keepingyour

arm loose). SeeFig.4-2. Letthe unit move

at its own paceand do not push down on

the handlebarsto try andforcethe tines to

dig deeper-- this takesweight offthe

wheels and reducestraction.

,_ WARNING: Donotpush

down onthe handlebarsto try

to makethetiller till more

deeply.This preventsthe

wheelsfrom holding the tiller

backand canallowthe tines to

rapidly propelthetiller forward,

which could resultin lossof

control, property damage,or

personalinjury.

5. Forreverse motion ofthe wheelsand

tines (Model644A only):

(a) Lookbehindand exercisecaution when

operating in reverse.Do not till while in

reverse.

(b) Stopall forward motion. Lift handlebar

with one handuntiltines areoff the ground

andthen pull ReverseClutchControl knob

out (seeFig.4-3). Tostop reversing,letgo

of ReverseClutch Control knob.

(b) Swingthe handlebarto theleft so the

right wheeltakesa "step" backward.Next

swing the handlebarto the rightso theleft

wheel"steps" backward.Repeatasneeded.

in reverse,shut off the engine,then place

the two wheels in FREEWHEEL.

7. ToTurnthe Tiller Around:

(a) Practiceturning the tiller in a level,

openarea.Beverycarefulto keepyour feet

and legsaway from the tines.

(b) Tobeginaturn, lift thehandlebarsuntil

thetinesareoutofthegroundandtheengine

andtinesarebalancedoverthewheels(Fig.

4-4).

handlebarto steer in direction of turn (Fig.

4-5). After turning, slowly lower tines into

soil to resumetilling.

Fig.4-3:Raisetinesoffgreundandlook

behindwhenmovinginreverse.

6. Tomovethe Model640Cin reversefor

short distances:

(a) Releaseforward ClutchBail.Thenlift

handlebaruntiltines are off theground.

Fig. 4-4: Tobegin turn, lift handlebarsuntil

tines are out of groundand unit is balanced.

Fig.4-5: Withtinesoutofgreund,pushhan-

dlebarssidewaystoturntiller.

StoppingtheTillerandEngine

1. Tostop thewheelsandtines, releasethe

Forward ClutchBail (all models) orthe Re-

verse ClutchControl (Model 644A) --

whichevercontrol is in use.

2. Tostop the engine,put the ignition

switch and/orthe throttle control leverin

the "OFF"or "STOP"position.

TILLINGTIPS& TECHNIQUES

Tilling Depths

WAHNING: Before

tilling, contact your

telephoneor utilities

companyand inquire if

undergroundequipment or

lines are usedon your

property. Donottill near

buriedelectric cables,

telephonelines, pipesor

hoses.

This isa CRT(counter-rotatingtine)tiller. Asthewheelspullforward,the tinesrotateback-

ward. Thiscreatesan "uppercut"tine actionwhich digs deeply,uprootingsoil and weeds.

Don't overloadthe engine,but dig asdeeplyaspossibleon eachpass.Onlaterpasses,the

wheelsmaytendto spinin thesoftdirt. Helpthemalongbylifting upslightlyonthehandlebar

(onehand,palm up,works mosteasily).

Avoidthetemptationto pushdownon thehandlebarsinan attemptto force thetiller to dig

deeper.Doingsotakestheweightoff the poweredwheels,causingthemto losetraction.

Withoutthewheelsto holdthetillerback,thetineswill attemptto propelthetiller backward,

towardstheoperator.(Sometimes,slightdownwardpressureonthehandlebarswill helpget

througha particularlytoughsectionofsodor unbrokenground,butin mostcasesthiswon't

benecessary.)

• Whencultivating(breakingup surfacesoilaroundplantsto destroyweeds,seeFig.4-9), ajust thetinesto dig only 1"to 2"deep.Using

shallowtilling depthshelpspreventinjury to plantswhoseroots often growclose to the surface.If needed,lift up on the handlebars

slightlytopreventthetinesfrom diggingtoo deeply.(Cultivatingona regularbasisnotonlyeliminatesweeds,it alsoloosensandaerates

thesoilfor bettermoistureabsorptionandfasterplantgrowth.)Wateringthegardenareaafewdayspriorto tillingwill maketillingeasier,

aswill lettingthenewlyworkedsoil setfor a dayor two beforemakinga final,deeptilling pass.

ChoosingCorrectWheel& TineSpeeds With experience,you will find the "just right" tilling depthandtilling speedcombination

that is bestfor yourgarden.

Settheenginethrottleleverata speedto givetheengineadequatepowerandyetallowit tooperateattheslowestpossiblespeed...atleast

until youhaveachievedthe maximumtilling depthyoudesire.Fasterenginespeedsmaybe desirablewhenmakingfinal passesthrough

theseedbedor whencultivating.Selectionofthecorrectenginespeed,in relationtothetilling depth,will ensurea sufficientpowerlevelto

do thejobwithout causingtheenginetolabor.

Letthe Tiller Dothe Work

Whiletilling, relaxandletthewheelspullthe

tiller along while the tines do the digging.

Walkon thesidethat is notyet finished(to

avoidmakingfootprints in thefreshlytilled

soil) and lightly,but securelygrip the han-

dlebarwith just onehand.

AvoidMakingFootprints

Wheneverpossible, walk on the untilled

sideoftheunitto avoidmakingfootprints in

your freshly tilled or cultivated soil. Foot-

prints causesoil compactionthat canham-

per root penetrationand contributeto soil

erosion. They can also "plant" unwanted

weed seeds back into the freshly tilled

ground.

AvoidTilling Soggy,WetSoil

Tilling wet soil often resultsin large,hard

clumpsof soil that caninterferewith plant-

ing.If time permits,wait a dayor twoafter

heavyrainsto allow the soil to dry before

tilling. Testsoil bysqueezingit intoa ball.If

itcompressestoo easily,it is toowet to till.

Preparing Seedbeds

•Whenpreparingaseedbed,go overthesamepathtwiceinthefirst row,thenover-

lapone-halfthetiller width ontherest ofthepasses(seeFig.6).Whenfinishedin

onedirection,makea secondpassata rightangle,as shownin Fig.4-7. Overlap

eachpassfor best results(invery hardground,it maytakethreeor four passesto

thoroughlypulverizethesoil.)

• If thegardensizewill not permitlengthwiseandthencrosswisetilling, thenover-

lapthefirst passesbyone-halfatiller

width,followedbysuccessivepasses ....................v .................................

at one-quarterwidth (seeFig.4-8). _ _

Fig. 4-8

Fig. 4-6 Fig.4-7

Cultivating

With planning, you can ==.._vp. ==_._v_

allow enoughroom _" _ (_

betweenrows to cultivate _ _

(seeFig.4-9). Leaveroom _ _

for the hood width,

plus enough extra _ _'

roomfor future plant Fig.4-9

growth.

TILLINGTIPS& TECHNIQUES(CON'T)

TillingOnSlopes

Readthe followingrecommendationsbeforetilling on slopes:

Ifyou mustgardenon a moderateslope,pleasefollow two very importantguidelines:

1.Tillonlyon moderateslopes,neveronsteepgroundwherefooting isdifficult (reviewsafe-

ty rulesin Section1:Safetyof this manual).

2. We recommendtilling up anddown slopesratherthan terracing.Tillingvertically on a

slopeallows maximumplantingareaandalsoleavesroomfor cultivating.

IMPORTANT:Whentilling onslopes,besurethecorrectoil levelis maintainedin theengine

(checkeveryone-halfhour of operation).Theinclineof the slopewill causethe oil to slant

awayfrom its normallevelandthis canstarveenginepartsof requiredlubrication.Keepthe

motor oil levelatthefull pointatall times!

WAHNING: Donot

operatetiller on aslopetoo

steepfor safe operation.Till

slowly and besureyou have

good footing. Neverpermit

tiller to freewheeldown

slopes.Failureto follow this

warning could result in

personalinjury.

Tilling Upand DownSlopes(VerticalTilling)

• Tokeepsoil erosionto aminimum, besureto addenoughorganicmatterto thesoil sothat it hasgoodmoisture-holdingtextureandtry

to avoidleavingfootprints orwheelmarks.

• Whentilling vertically,tryto makethefirst passuphillasthetillerdigsmoredeeplygoing uphillthanitdoesdownhill.Insoftsoilor weeds,

youmayhaveto lift the handlebarsslightlywhilegoing uphill.Whengoingdownhill, overlapthefirst passby aboutone-halfthewidth of

thetiller.

Clearingthe Tines

Thetineshavea self-clearingactionwhicheliminatesmosttanglingofdebrisinthe

tines.However,occasionallydrygrass,stringystalksortoughvinesmaybecometan-

gled.Followtheseproceduresto helpavoidtanglingandto cleanthetines,if neces-

sary.

•Toreducetangling,setthedepthregulatordeepenoughtogetmaximum"chopping"

actionasthetines chopthe materialagainsttheground.Also,try to till undercrop

residuesor covercropswhiletheyaregreen,moistandtender.

• Whiletilling,try swayingthehandlebarsfrom sideto side(about6"to 12").This

"fishtailing"actionoftenclearsthetinesofdebris.

• Iftanglingoccurs,lift thetinesoutofthesoilandrunthetiller in reverse(if unitis

equippedwithpoweredreverse)forafewfeet.Thisreversingactionshouldunwinda

gooddealofdebris.

• It may benecessaryto removethe debris by hand(a

pocketknifewill helpyou to cut awaythe material). Be

sure to stopthe engineand disconnect the sparkplug

wire beforeclearing the tines by hand.

WARNING: Beforeclearing the

tines byhand,stop the engine,allow all

moving partsto stop anddisconnect the

spark plug wire. Removethe ignition key

on electric start models.

Failureto follow this warning could result

in personalinjury.

Loading andUnloadingtheTiller

,_ WARNING: Loadingand

unloadingthetillerintoavehicleis

potentiallyhazardousandwedon't

recommenddoingsounless

absolutelynecessary,asthiscould

resultinpersonalinjuryor

propertydamage.

However,ifyoumustloador

unloadthetiller,followthe

guidelinesgivennext.

•Beforeloadingor unloading,stoptheengine,

waitfor allpartsto stopmoving,

disconnectthesparkplugwireandlettheen-

gineandmufflercool.

•Thetilleristooheavyandbulkytolift safely

byoneperson.Twoor morepeopleshould

sharetheload.

• Use sturdy ramps andmanually (engineshut

off) roll the tiller into and outof the

vehicle. Two or morepeople areneededto do

this.

• Theramps mustbestrong enoughto support

the combined weight of the tiller and any han-

dlers. Theramps should provide good traction

to prevent slipping; they shouldhave siderails

to guidethe tiller along the ramps; and they

should havealocking deviceto securethemto

the

vehicle.

• Thehandlersshouldwearsturdyfootwearthat

will helpto preventslipping.

• Positionthe loading vehicle sothat the ramp

angleis as flat as possible(the less inclineto

the ramp,the better). Turnthe

vehicle'sengineoff and apply its parking brake.

• When going up ramps, stand in the

normal operating position and pushthe tiller

ahead of you. Havea person at each sideto

turn the wheels.

• When going down ramps, walk backward

with the tiller following you. Keepalertfor any

obstacles behindyou. Positiona personat

eachwheel to control the speedof the tiller.

Nevergo down rampstiller-first, asthe tiller

could tip forward.

• Placewooden blocks on the downhill side of

the wheels if you needto stop the tiller from

rolling down the ramp.Also, use the blocks to

temporarily keepthe tiller in place onthe

ramps (if necessary),andto chockthe wheels

in place after the tiller is in the vehicle.

• After loadingthe tiller, prevent it from rolling

byengaging thewheels in the WHEELDRIVE

position. Chockthe wheelswith blocksand se-

curelytie the tiller down.

TILLINGTIPS& TECHNIQUES(CON'T)

TerraceGardening(continued)

• Tocreateaterrace,startatthe top of the slopeand work down. Gobackand

forth acrossthefirst rowasshown in Fig.4-10.

• Eachsucceedinglowerterraceis startedby walking belowthe terraceyou're O m_

preparing.Foraddedstability ofthetiller,alwayskeeptheuphillwheelinthesoft,

newlytilled soil. Donottill the last 12"or moreof thedownhill outsideedgeof

eachterrace.Thisuntilledstrip helpspreventstheterracesfrom breakingapart

andwashingdownhill. It alsoprovidesawalkingpathbetweenrows. _, REPEAT

Fig. 4-10

LOADINGAND UNLOADING

THE TILLER

,_ WARNING: Loadingand

unloading thetiller into a

vehicleis potentially hazardous

andwedon't recommenddoing

so unlessabsolutelynecessary,

asthis could result in personal

injury or property damage.

However,if you must load or

unloadthe tiller, follow the

guidelinesgivennext.

• Beforeloading or unloading,stop the en-

gine,wait for all parts to stop moving,

disconnect the spark plug wire and letthe

engineand muffler cool.

•Thetiller istoo heavyand bulky to lift

safelyby one person. Twoor more people

should sharethe load.

• Usesturdy ramps and manually (engine

shut off) roll thetiller into and out of the

vehicle.Twoor more peopleare neededto

do this.

• Theramps must bestrong enoughto

support the combined weight of thetiller

and anyhandlers. The rampsshould pro-

videgoodtraction to preventslipping; they

should haveside railsto guide thetiller

along the ramps; andthey should havea

locking deviceto secure them to the

vehicle.

•Thehandlersshouldwearsturdyfootwear

that will helpto preventslipping.

• Position the loading vehicle so that the

ramp angle is asflat aspossible (the less

incline to the ramp, the better). Turnthe

vehicle'sengine off and apply its parking

brake.

•When going up ramps,stand in the

normal operating position and pushthe

tiller aheadofyou. Havea person ateach

sideto turn the wheels.

•Whengoing down ramps,walkbackward

with thetiller following you. Keepalertfor

anyobstacles behind you. Position a per-

son ateachwheelto control the speedof

thetiller. Nevergo down rampstiller-first,

asthe tiller could tip forward.

•Placewoodenblocksonthedownhill side

of the wheels if you needto stop the tiller

from rolling downthe ramp. Also, usethe

blocksto temporarily keepthe tiller in

placeon the ramps (if necessary),and to

chockthe wheels in placeafter the tiller is

in the vehicle.

• After loading the tiller, preventit from

rolling byengagingthe wheels in the

WHEELDRIVEposition. Chockthe wheels

with blocksandsecurelytiethetiller down.

SECTION5: MAINTENANCE

WARNING: Before

inspecting, cleaningor servicing

the machine,shut off engine,

wait for all moving parts to come

to acompletestop, disconnect

spark plug wire and movewire

awayfrom spark plug. Remove

ignition keyon electricstart

models.

Failureto follow these

instructions can result in serious

personalinjury or property

damage.

MAINTENANCESCHEDULE

PROCEDURE

Checkmotor oil level

Cleanengine

Checkdrive belttension

Checknuts and bolts

Changemotor oil

Lubricatetiller

Serviceengine air cleaner system

Checkgearoil levelin transmission

Checktines for wear

Checkair pressure in tires

(if unit haspneumatic tires)

Servicespark plug

NOTES

2,3

2,7

1,4

4,6,9

1,5

1 Checkafter first 2 hours of break-in operation.

2 Beforeeach use.

3 Every5 operating hours.

4 Every 10operating hours.

5 Every30 operating hours,

6 Changemore frequently in dusty conditions.

7 - See EngineOwner's Manual forservice

recommendations.

8 - Whichever time interval occurs firsL

g - Changeafter first 2 hours of break-in

TILLER LUBRICATION

After every 10 operating hours, oil or

greasethe lubrication points shownin

Figure5-1 anddescribedbelow.

Usecleanlubricating oil (#30weight motor

oil is suitable) and cleangeneralpurpose

grease(greasecontaining a metallubricant

is preferred, if available).

• Removethe wheels,cleanthe wheelshaft

(A,Fig. 5-1) and applya thin coating of

greaseto the wheelshaft.

• Greasethe back,front andsidesof the

depthregulator lever (B, Fig.5-1).

• Removethetines andcleanthetine shaft

(C,Fig.5-1). Usea file or sandpaperto gen-

tly removeany rust, burrs or rough spots

(especiallyaround holes inshaft). Apply

greaseto ends of shaft beforeinstalling

tines.

• Oil thethreads on the handlebar height

adjustment screws and the handlebar

attaching screws (D, Fig.5-1).

Figure5-1

CHECKFOROIL LEAKS

Beforeeachuse,checkthetiller for signs of

an oil leak-- usually a dirty, oily accumu-

lation eitheron the unit or on the floor.

A little seepagearound a cover or an oil

sealis usually not a causefor alarm. How-

ever,if the oil drips overnight, then imme-

diateattention is needed.Ignoring an oil

leakcanresult in severetransmission

damage!

If acover is leaking,check for loose

screws. If the screws aretight, a new

gasket or oil seal may be required.

If the leakisfrom around a shaftand oil

seal, the oil sealprobably needsto be

replaced.Seeyour authorized dealeror

contact the factory for serviceor advice.

IMPORTANT:Neveroperatethe tiller if

thetransmission islow onoil.Checkthe

oil levelafter every 30 hours of

operationand wheneverthere is anyoil

leakage.

CHECKHARDWARE

Checkfor looseor missing hardwareaf-

ter every 10 operatinghoursandtighten

or replace(asneeded)beforereusing

tiller

Besureto checkthe screws underneath

thetiller hoodthat securethe transmis-

sioncoverandtheDepthRegulatorLever

to thetransmission.

CHECKTIRE PRESSURE

(Models with pneumatictires)

Checkthe air pressurein bothtires. The

air pressure should be between 15 PSi

and 20 PSi (pounds per squareinch).

Keepbothtires equally inflated to help

prevent machinefrom pulling to one

side.

TRANSMISSION

GEAROIL SERVICE

Checkthe transmission gear oil level

after every 30 hours of operationor

wheneveryou notice anyoil leak.Oper-

ating thetiller when thetransmission is

low on oil can result in severedamage.

A. To Checkthe Transmission

GearOil Level:

1. Checkthe gear oil levelwhenthe

transmission is cool. Gearoil will

expandin warm operatingtemperatures

and this expansionwill providean incor-

rect oil level reading.

2. With thetiller onlevelground, pullthe

Depth Regulator Leverall the way up.

3. Removethe oil fill plug (A,Fig. 5-2)

from thetransmission housingandlook

insidethe oil fill hole to locatethe main

driveshaft situated belowthe hole.

WARNING: Beforeinspecting, cleaningor servicing the machine,shut off engine,wait for all

moving partsto come to a completestop, disconnect spark plug wireand move wireawayfrom

spark plug. Failureto follow these instructions canresult in serious personalinjury or property

damage.

4. Thegear oil leveliscorrect ifthegear oil

isapproximately halfway upthe sideofthe

main driveshaft.

5. Ifthe gearoil levelislow, addgear oil as

described next.If the gearoil levelisokay,

securely replacethe oil fill plug.

IMPORTANT:Donot operatethe tiller ifthe

gear oil level islow. Doingso will result in

severedamageto the transmission com-

ponents.

Figure5-2: Remove oil fill p/ug (,4)to check

gear oil level and toaddgear oil. Remove

fourcoverscrews(B) to draingear oil.

6. If addingonly afewouncesof gear oil,

useAPIratedGL-4or GL-5gearoil having

a viscosity of SAE140, SAE85W-140 or

SAE80W-90. If refilling an emptytrans-

mission, useonly GL-4gear oil having a

viscosity of SAE85W-140 or SAE140.

IMPORTANT:Donot useautomatic trans-

mission fluid or motor oil inthe transmis-

sion.

7. Whilecheckingfrequentlyto avoidover-

filling, slowly addgear oil into the oil fill

hole until it reachesthe halfwaypoint on

the driveshaft.

8. Securely replacethe oil fill plug.

B. ToDrain theTransmissionGearOil:

Thetransmission gear oil doesnotneedto

bechangedunless it hasbeencontaminat-

ed with dirt, sand or metalparticles.

1. Draingasolinefrom thefuel tankor run

the engine until thefuel tank is empty.See

"DANGER"statement below.

WARNING: Gasolineis

highlyflammableandits vapors

areexplosive. Followthese

safety practicesto prevent

personalinjury or property

damagefrom fire orexplosion.

Allow the engine and muffler to cool

for at least two minutesbeforedrain-

ingtheUller's gasolinetank.

Do not allow open flames, sparks,

matchesorsmokingin thearea.

Wipe away spills and pushtiller away

fromspilledfuel.

Use only an approvedfuel container

and store it safelyout of the reach of

children.

Do notstoregasolinein an area where

its vaporscould reach an openflame

orspark,orwhere ignitionsourcesare

present(suchas hot water and space

heaters, furnaces, clothes dryers,

stoves,electricmotors,etc.)

2. Drainthe oil from the engine.

3. Removefour screws (B,Figure5-2) and

removetransmissioncoverandgasket.

4. Removethe left-side wheel.

5. Tilt the left-side wheelshaft into a drain

panand allowthe gearoil to drainthrough

the top of thetransmission.

6. Reinstallthe wheel.

7. Install a newgasket (do not reuseold

gasket)and reinstall thetransmission cov-

er.

8. Refill thetransmission using GL-4gear

oil (SAE85W-140 or SAE140).

9. Refill the enginewith motor oil and re-

plenishthe fuel tank with gasoline.

BOLOTINES

Thebolo tines will wearwith useand

should be inspectedatthe beginning of

eachtilling seasonand after every30 oper-

ating hours. Thetines can be replacedei-

ther individually or as a completeset. See

the Parts List pagesfor tine identification

and part numbers.

A. Tine Inspection:

With use,the tines will becomeshorter,

narrower and pointed. Badlyworn tines

will result inaloss of tilling depth, and re-

ducedeffectivenesswhenchopping up

andturning under organic matter.

B. Removin_nstalling a Single Tine:

1. With the engine shut off andthe spark

plug wire disconnected,remove thetwo

screws (A,Figure5-3)and nuts (B)that at-

tachasingletineto atine holder.If needed,

usepenetrating oil onthe nuts.

2. When installing a singletine, besureto

position it so that its cutting edge (sharp)

will enter thesoil first asthe tiller moves

forward.

C. Removin_nstalling a TineAssembly:

1. Atine assemblyconsists of eighttines

mounted on atine holder.

2. If removingboth tine assemblies,mark

them "left" and "right" beforeremoval. Re-

move the screw (C, Figure5-3) and lock-

nut (D)that securethetineassemblytothe

tineshaft. If necessary,usea rubber mallet

to tapthe tine assembly outward off the

shaft.

3. Beforereinstallingthetine assembly,in-

spectthe tineshaftfor rust, roughspots or

burrs. Lightly file or sand, asneeded.Ap-

ply a thin coat of greaseto the shaft.

4. Install eachtine assemblyso that the

cutting (sharp) edge of thetines wifl enter

thesoil first whenthetiflermovesforward.

Securethe tine assemblyto the tine shaft

usingthe screwand Iocknut

,_ WARNING: Beforeinspecting, cleaningor servicing the machine,shut off engine,wait for all

moving partsto come to a completestop, disconnectspark plugwireand move wireawayfrom

spark plug. Failureto follow these instructions canresult in serious personalinjury or property

damage.

FORWARD

Figure5-3: Instafl tinesso that cutting edge of tines enter soft first when tiller movesforward.

CHECKINGAND ADJUSTING

FORWARDDRIVE BELT TENSION

It is important to maintain correct tension

on the forward drive belt. A loosebeltwill

causethetinesandwheelsto slow down--

or stop completely -- eventhough the en-

gine is running at full speed.A too tight

belt can result in unintentional tine move-

ment whenthe clutch bail isin the Neutral

(released)position.

• Checkbelt tension after the first two

hours ofbreak-inoperationandafter every

10 operatinghours.

• Atthe end of eachtilling season,check

the beltfor cracks,cuts or frayededges

and replaceit assoon as possible.

tension is correct if this secondmeasure-

ment isbetween1/6"-to- 3/16"longer than

the first measurement.

4. If the spring is too short (lessthan

1/16"),the tension istoo loose. If the

spring istoo long (morethan 3/16"), the

tension is too tight.

5. Toadjust the length ofthe spring:

a. Releasethe Forward Clutch Bail.

b. Unthreadthe hexnut (C,Figure5-4)

halfway up the adjustment screw (D).

c. Unhookthetop ofthe springfrom the

Forward Clutch Bail.

d. Usepliersto preventthe adjuster (B)

from turning andturn the slotted screwlo-

cated insidethe spring clockwise (viewed

from operator'sposition) to increaseten-

sion onthespring. Turnthescrewcounter-

clockwiseto decreasetension. Once

adjusted, reattachthe spring to the For-

ward Clutch Bail.

e.RepeatSteps2and3to re-measurethe

lengthofthespring.Whenthesecondmea-

surementis between1/16"-to-3/16"longer

thanthefirst measurement,retightenthehex

nut (C)againstthetop oftheadjuster(B).

ReplacementBelt Information

If the drive belt needsto be replaced,see

your local authorizeddealeror referto the

Parts List for ordering information. Use

only afactory-authorized belt asan "over-

the-counter" belt may not perform satis-

factorily. Theprocedure requiresaverage

mechanicalability andcommonly available

tools.

ToCheckForwardBeltTension:

1. Stopengine,wait for all parts to stop

moving and disconnect spark plug wire.

2. With the ForwardClutchBailinan open

(released)position, measureand notethe

overalllengthofthecablespring (A,Figure

5-4) by measuringfrom the outermost coil

to the outermost coil.

3. SqueezetheForwardClutchBailagainst

the handlebar(seeFigure5-4) and re-

measurethe length of the coils. Thebelt

Figure5-4: Tocheckforwardbelt tension,taketwomeasurementsofthe

overa///engthof thecoils inthespring-- first withthedutch bail open,

thenwith thedutch bail closedagainstthe handlebar.

,_ WARNING: Beforeinspecting, cleaningor servicing the machine,shut off engine,wait for all

moving partsto come to a completestop, disconnectspark plugwireand move wireawayfrom

spark plug. Failureto follow these instructions canresult in serious personalinjury or property

damage.

FORWARDCLUTCH

BAIL ADJUSTMENT

If the Forward Clutch Baildoes notfunc-

tion properly,first checkthat the forward

drive belt is adjusted properly (see Check-

ing andAdjusting Forward Drive Belt Ten-

sion). If this failsto correct the problem,

contact Troy-Bilt LLCor your authorized

dealerfor serviceadvice.

CHECKINGANDADJUSTINGRE-

VERSEDRIVEBELTTENSION

(Model644A only)

It is important to maintain correct tension

on the reversedrive belt. A loosebeltwill

causethetines andwheelsto slow down-

or stop completely - eventhough the en-

gine is running at full speed.

Whencheckingbelttension, alsocheckthe

belt for cracks, cuts or frayed edgesand

replaceit as soonas possible.

• Checkbelt tension after the first two

hours ofbreak-inoperationandafter every

10 operatinghours.

ToCheckReverseBeltTension:

1. Stopengine,wait for all parts to stop

moving and disconnect spark plug wire.

2. Removescrew in plastic beltcover and

slide beltcover (which is attachedto for-

ward clutch cable) out of the way.

3. Haveanassistant pull the Reverse

Clutch Control knob all the way out and

hold it inthat position. Measurethelength

of the cablewire betweenthe end of the

threadedcableadjuster (A,Figure5-5) and

the end of the Z-fitting (B)to which the ca-

ble wire is attached.

4. Thebelttension is idealif the cablewire

lengthmeasuresbetween1/8"to 1/4".If it is

lessthan 1/8"(andif there isno reverseac-

tion whenthe tiller is running),thenmake

the following adjustments

NOTE:Ifthe lengthis morethan 1/4",noad-

justment isneeded--as long asthe reverse

actionfunctions properly.

5. Releasethe ReverseClutchControl

knob.andthen unthreadthe inner jam nut

(C, Figure5-6) oneto two turns. Pull the

threaded cableadjuster (A, Figure5-6) to

the left untilthe innerjam nut (C)touches

the bracket.

6. Preventthe inner jam nut (C)from turn-

ing and tighten the outer jam nut (D)

againstthe bracket. Preventthe outer jam

nut (D)from turning and tighten the inner

jam nut (C)againstthe bracket.

7. Measurethe gap by repeatingStep3.

Readjustasneededby repeatingSteps 5

and 6.

8. Reinstallthe belt cover.

Figure5-5: Measure cable wire lengthto

checkforcorrectreversebelt tension.

Figure5-6:Movethreadedadjuster(,4)toleft

toincreasebelttension.

Replacement Belt Information

If the drive belt needsto be replaced,see

your local authorizeddealeror referto the

Parts List for ordering information. Use

only a factory-authorized belt asan "over-

the-counter" belt may not perform satis-

factorily. Theprocedure requiresaverage

mechanicalability andcommonly available

tools.

ENGINECLEANING

Keepingthe enginecleanwill help to en-

sure smooth operation and prevent dam-

agefrom overheating.Referto the Engine

Owner's Manualfor enginecleaning ser-

vice intervals and instructions. Besure

thatthe muffler iscool beforeservicingthe

engine.

AIRCLEANERSERVICE

Theair cleanerfilters dirt and dust out of

the air before it enters the carburetor.Op-

eratingthe enginewith a dirty, cloggedair

filter can causepoor performanceand

damageto the engine. Neveroperatethe

enginewithout theair cleanerinstalled. In-

spectand service the air cleanermore of-

ten if operating in very dusty or dirty

conditions. Referto the engine Owner's

Manualfor air cleanerserviceintervalsand

instructions.

ENGINEOIL SERVICE

Checkthe engine oil level beforeeachuse

and after every five hours of continuous

operation. Runningthe engine when it is

low on oil will quickly ruin theengine.

It is recommendedthat you changethe

motor oil after every 10hours of operation

and evensoonerwhen operating in ex-

tremely dirty or dustyconditions. Referto

the EngineOwner'sManualfor detailed

serviceinstructions.

A. ToChecktheEngineOil Level:

1. Parkthetiller ona levelareaandshut off

the engine.

2. Leveltheengine (usethe Depth Regula-

tor Leverto adjust the engineangle).

,_ WARNING: Beforeinspecting, cleaningor servicing the machine,shut off engine,wait for all

moving partsto come to a completestop, disconnectspark plugwireand move wireawayfrom

spark plug. Failureto follow these instructions canresult in serious personalinjury or property

damage.

3. Cleanaround the oil dipstick or oil fill

tube (whicheverapplies) to prevent dirt

from falling into the crankcase.

4. Onengineswith an oil fill tube, remove

the fill capand add oil (if required) until it

reachesthetop ofthefill tube. Reinstallthe

fill cap.

5. Onengineswith a dipstick, remove it

and wipe it clean. Reinsertthe dipstick,

tighten it securely,and removeit. Add oil

asneededto bring the levelupto theFULL

mark.Wipe dipstick cleaneachtime oil

levelis checked. Donot overfill. Tighten

dipstick securely.

B. ToChangetheEngineOil:

Changethe engine oil as instructed inthe

EngineOwner's Manual.

SPARKPLUGSERVICE

Inspect andcleanor replacethespark plug

after every 100 operating hours or annual-

ly. Referto the EngineOwner'sManualfor

spark plug serviceinstructions.

In some areas,local law requiresusing re-

sistor spark plugsto suppress ignition sig-

nals. If the enginewas originally equipped

with a resistorspark plug, usethe same

type for replacement.

SPARKARRESTERSCREEN

SERVICE

If the engine muffler is equipped with a

spark arresterscreen, removeand cleanit

according to the service intervalsand in-

structions in the EngineOwner'sManual.

THROTTLELEVERADJUSTMENT

If the engine doesnot respondto various

throttle leversettings, referto the Engine

Owner'sManualfor serviceinformation or

contact your localauthorized enginedeal-

er.

WARNING: Operators

shallnottamper with theengine

governorsettings onthe

machine;the governor controls

the maximum safeoperating

speedto protect theengineand

all moving partsfrom damage

causedby overspeed.

Authorizedserviceshall be

sought if a problem exists.

CARBURETOR/GOVERNOR

CONTROLADJUSTMENTS

Thecarburetor wasadjusted atthefactory

for best operatingspeed. Referto the En-

gine Owner's Manualfor anyadjustment

information or seeyour authorizedengine

dealer.

Thegovernor controls the maximum safe

operatingspeedand protects the engine

andall moving partsfrom damagecaused

by overspeeding.Donot tamper with the

enginegovernor settings.

OFF-SEASONSTORAGE

Whenthetiller won't be usedfor an ex-

tendedperiod,prepareit for storageasfol-

lows:

1. Cleanthetiller and engine.

2. Do routinetiller lubrication and check

for looseparts and hardware.

3. Protectthe engine and perform recom-

mendedengine maintenanceby following

the storage instructions found in the En-

gine Owner's Manual.Besure to protect

the fuel lines, carburetor and fuel tank

from gum deposits byremoving fuel or by

treating fuel with a fuel stabilizer (follow

enginemanufacturer'srecommendations).

4. Store unit in aclean, dry area.

5. Neverstore thetiller with fuel in thefuel

tank in an enclosedareawhere gasfumes

could reachan open flame or spark, or

whereignition sourcesare present (space

heaters,hot water heaters,furnaces, etc.).

PROBLEM

Enginedoes notstart

Enginerunspoorly.

Engineoverheats.

Enginedoesnotshotoff

WheelsandTineswillnotturn

Tinesturn,butwheelsdon't,

WheelsTurn,butTinesDon't,

Poortillingperformance.

WARNING: Beforeinspecting, cleaningor servicing the machine,shut off engine,wait for all

moving partsto come to a completestop, disconnectspark plugwireand move wireawayfrom

spark plug. Failureto follow these instructions canresult in serious personalinjury or property

damage.

TROUBLESHOOTING

POSSIBLECAUSE

1. Spark plug wire disconnected

2. EngineThrottle Control Lever incorrectly set.

3. Fueltank empty.

4. Choke control (if so equipped) in incorrect position.

5. Stale gasoline.

6. Dirty air filter.

7. Defective or incorrectly gapped spark plug.

8. Carburetor out of adjustment.

9. Misadjusted throttle control.

10. Dirt or water in fuel tank.

1. Defective or incorrectly gapped spark plug.

2. Dirty air filter(s).

3. Carburetor out of adjustment.

4. Stale gasoline.

5. Dirt or water in fuel tank.

6. Enginecooling system clogged.

1. Enginecooling system clogged.

2. Carburetor out of adjustment.

3. Oil level is low.

1. Misadjusted throttle control or ignition switch.

1. Improper useof controls.

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

3. Internal transmission wear or damage.

4. Bolt loose in transmission pulley.

1. Wheel Drive Pins not in WHEELDRIVE.

2. Bolt loose in transmission pulley.

3. Internal transmission wear or damage.

1. Tineholder mounting hardware missing.

2. Bolt loose in transmission pulley.

3. Internal transmission wear or damage.

1. Worn tines.

2. Improper Depth Regulator setting.

3. Incorrectthrottle setting.

4. Forward Drive Beltslipping.

CORRECTION

Reconnectwire.

2. Put lever in STARTposition.

3. Add fuel.

4. See EngineOwner's Manual.

5. Drain fuel and add fresh fuel.

6. Clean or replace filter.

7. Inspect spark plug.

8. See EngineService Dealer.

9. See EngineService Dealer

10. See EngineService Dealer.

Inspectspark plug (see EngineOwner's Manual).

2. Clean or replace (see EngineOwner's Manual).

3. See EngineService Dealer.

4. Replacewith fresh gasoline.

5. See EngineService Dealer.

6. Cleanair cooling system (see EngineOwner's Manual).

Cleanair cooling area (seeEngine Owner's Manual).

2. See EngineService Dealer.

3. Checkoil level (seeEngineOwner's Manual).

1. See EngineOwner's Manualor EngineService Dealer.

1. ReviewSections 3 and 4.

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

3. Contact local dealeror the factory.

4. Tighten bolt.

1. See "Wheel Drive Pins" in Section 3.

2. Tighten bolt.

3. Contact local Dealeror the Factory.

1. Replacehardware.

2. Tighten bolt.

3. Contact local Dealeror the Factory.

1. See "Bolo Tines" (Section 5).

2. See "Tilling Tips & Techniques," Section 4.

3. See Section 4.

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

1 :::3

PartsList

m13

(A)ForModel640C

(B)ForModel644A

REF

PART NO.

NO.

1 715-0108

2 710-0597

3 710-0599

4 710-0874

5 710-3008

6 712-04064

7 712-04063

8 1916707

9 736-0119

10 GW-55013-1

11 GW-55013-2

12 GW-55015

13 GW-55018

DESCRIPTION

Spirol Pin

Hex Hd. Screw,1/4-20x 1

Screw,Self-Tapping,I/4-20 x 1/2

HexHd. Screw,5/16-18 x 1-1/4

HexHd. Screw,5/16-18 x .75

HexLock Nut,Nylon, 1/4-20

HexLock Nut,Nylon,5/16-18

ChannelSupport Bracket

Lock Washer,5/16

Hood Bracket,LeftHand

Hood Bracket,RightHand

DragBar

DepthRegulatorLever

REF

NO.

PARTNO.

686-04043

686-04041

GW-55088

GW-9384

GW-9534

710-04048

618-04254

618-04046

786-04191

1916570

710-0395

1916771

736-0275

DESCRIPTION

TineHoodAssembly (A}

TineHoodAssembly (B)

Bushing

Spring, DepthRegulator

Spacer

HexHd. FlangeScrew, 5/16-18 x 1

Transmission Assembly(A}

Transmission Assembly(B)

FlapStop Bracket

ReverseStop Arm

HexScrew,5/16-18 x 2.25

Spacer,.462x .328x 1.63

FlatWasher,5/16

MODELS640C& 644A

14 18

MODELS640C & 644A

REF

NO.

PARTNO. DESCRIPTION

1916719

1916755

747-04210

1918745

710-0599

710-3008

712-3009

786-04188

GW-55043

786-04200

GW-55044

GW-9855

725-0157

736-3050

732-04040

732-04185

710-0106

710-0216

710-0805

712-0121

712-0291

712-3000

736-0119

CableAssembly,ReverseClutch(B)

UpperHandlebar

Bail,ForwardClutch

CableAssembly,Forward Clutch

Screw,Self-Tapping,I/4-20 x 1/2

Screw,Hex,5/16-18 x 3/4

HexLock Nut,5/16-18

HandlebarSupport

Lower Handlebar

Panel

Tab, ConduitMount

Screw,#10-24 x 2

CableTie

FlatWasher,3/8

Bracket,ReverseClutch Cable(B)

Spring,Forward Clutch

HexHd.Screw,1/4-20 x 1-1/4

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

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

HexNut,#10-24

HexLock Nut, 1/4-20

HexNut,3/8-16

LockWasher,5/16

REF

PARTNO. DESCRIPTION

NO.

1 749-04193 Bumper(B)

2 710-0395 HexScrew,5/16-18x2-1/4,Gr5(B)

3 726-0201 Nut,Speed,5/16-18(B)

4 712-04063 HexLockNut,Nylon,5/16-18(B)

(A)ForModel640C

(B)ForModel644A

MODELS640C& 644A

REF

NO.

PARTNO. DESCRIPTION

GW-9517

GW-1714

GW-50043

711-04110

GW-1224-1*

GW-1224-2"

GW-1224-3"

GW-1224-4"

GW-1325C

SnapRing

Bearing,TaperedRoller(with race)

Support Washer, Rear

DriveShaft

Shim, RearBearingCap,.010"thick

Shim, sameasabove, except .030"thick

Shim, sameasabove, except.O05"thick

Shim, sameasabove, except .062"thick

Shim Set (Incl. thefollowing shims:

two #1224-1, two 1224-2 & one#1224-4)

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

REF

NO.

PARTNO. DESCRIPTION

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

Plug,TransmissionOilFill

HexHd.FlangeScrew,5/16-18x5/8,Gr.5

LockWasher,5/16

RearCover,Transmission

FrontCover,Transmission

Gasket,HousingCover

OilSeal,DriveShaft

OilSeal,WheelShaft

TransmissionRousingAssembly

OilSeal,TineShaft

Washer,Flat,.344x.750x.120

RearBearingCap

RexHd.FlangeScrew,5/16-18x 1

HexHd.FlangeScrew,5/16-18x3/4

*Includedwithtransmissionwhenpurchasedasanassemblyonly.

Removeanddiscardwheninstallingthetransmissionontiller.

MODELS640C & 644A

FRONT

.,J

(A)ForModel640C

(B)ForModel644A

REF

NO.

* Useas

PARTNO. DESCRIPTION

GW-9512

1909950

GW-1166-1*

GW-1166-2"

GW-1166-3"

GW-1166-4*

GW-1166-5"

GW-1086

711-04088

711-04092

GW-9305

GW-1132-2

1904278

711-04078

GW-1104

1916542

Retainer,SnapRing, "E" Type

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)

Key,Hi-Pro, 1/4 x 1

Spacer

Worm Gear,WheelShaft

Tiller Shaft

Woodruff Key

Worm Gear,Tiller Shaft

requiredto obtain between .005" and.030" allowable end-play.

MODELS640C& 644A

9 ! I11_ 7 1 19

, FORWARD

MODELS640C & 640A

REF

PART NO.

NO.

1 736-0159

2 714-0139

1108841

3 1916351

4 656-04023

656-04005

5 1916535

6 1916652

7 1916657

8 1916658

9 1916660

10 1916724

11 1916725

12 1916726

13 1916794

14 1916795

15 1917326

16 1917746

17 1918731

18 1918744

19 710-0627

710-0117

20 710-0237

21 710-0376

DESCRIPTION

FlatWasher,5/16

Key,3/16"x 2" (A)

Key,3/16"x 1-1/2"(B)

Pulley, EngineDrive

Transmission Pulley(A)

Transmission Pulley(B)

Pulley, ReverseIdler (B)

Guard,Belts/Pulleys

ForwardDriveBelt

ReverseDrive Belt(B)

BeltCover

ReverseReturn Spring (B)

BeltGuide (B)

ForwardBeltGuide

EngineBracket, Left

EngineBracket, Right

Bracket,BeltCover

Shoulder Washer

ReverseIdlerArm (B)

ForwardIdler Lever

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

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

HexHd. Screw,5/16-24 x 5/8

HexHd. Screw,5/16-18 x 1

REF

NO.

PART NO.

710-04049

710-0347

710-0599

710-3103

712-3000

712-3009

736-0119

750-0535

736-3090

736-0452

710-0151

GW-50027

GW-55034

GW-55049

GW-9090

GW-9301

736-3078

GW-9944

710-0395

712-3010

750-0258

736-0315

GW-1138-2

DESCRIPTION

Hex Hd.Screw, 5/16-18x 5/8

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

Screw,Self-Tapping, 1/4-20x 1/2

Hex Hd.Screw, 5/16-18x 2 (B)

Lock Nut,3/8-16

Lock Nut,5/16-18

LockWasher, 5/16

Spacer,.380 IDx .625 ODx .21

FlatWasher

BellWasher

Hex Hd.Screw,3/8-24 x 2.0,GR5

Support Washer

ForwardReturnSpring

Bracket,CableMounting

ForwardIdler Pulley

Key,3/16"x 1"

FlatWasher

BellevilleWasher

HexScrew,5/16-18 x 2.25 Gr5 (A}

Nut, HexLock, 5/16-18 (A)

Spacer,Shoulder (A)

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

Shim, 1.0x .765x .031 (B}

(A)ForModel640C

(B)ForModel644A

MODELS640C& 644A

TINE SHAFT

FORWARD

7 "

REF

NO.

PARTNO. DESCRIPTION

710-0514

GW-50049-02

712-3000

710-0347

GW-50049-01

1915075

1916747

1917486

734-04162

734-04161

GW-9380

GW-9338

GW-1901

(A)ForModel640C

(B)ForModel644A

HexHd.Screw,3/8-16 x 1,Grade5

Single Bolo Tine- Left Hand

HexLock Nut, 3/8-16

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

Single Bolo Tine- Right Hand

TineHolder(A)

TineHolder(B}

Wheel& TireAss'y -- Left/Right Side(B)

Wheel& TireAss'y -- LeftSide Only(A)

Wheel& TireAss'y-- Right SideOnly(A)

ClevisPin, .312"x 1-3/4"

Hair PinCotter

Bolo TineReplacementSet (Incl. eight

right-hand tines, eightleft-hand tines and

required hardware. (A) (B)

HoldTinesWith Blunt EndTowardYou

RIGHT-HANDTINE LEFT-HANDTINE

NOTE:Identify Left and Rightsides of tiller by standing in

operator position andfacing direction of forward travel.

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 Troy-Bilt LLC will, at its option, repair or replace any part found to be defective in material or

BY THIS WARRANTY 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. Refer

to the applicable manufacturer's warranty on these items for terms and conditions.

WHAT IS NOT This warranty does not apply to parts that have been damaged by accident, alteration, misuse,

COVERED BY THIS abuse, neglect, improper maintenance, vandalism, theft, fire, water, or damage because of peril

WARRANTY 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. Refer to the engine

manufacturer's warranty for terms and conditions.

LIMITED

COMMERCIAL

USE WARRANTY

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, 1-866-520-5220, 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 assistance, contact your nearest authorized dealer, or contact us at:

TROY-BILT LLC, P.O. Box 361131, Cleveland, Ohio 44136-0019, 1-866-840-6483

Troy-Bilt 21A-644A711 Rear-tine Tiller

Product's Documents

Operator's Manual

Specifications

Troy-Bilt 21A-644A711 Questions and Answers

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