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,_ 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 fails to correct the problem,
contact Troy-Bilt LLCor your authorized
dealerfor serviceadvice.
CHECKINGANDADJUSTINGRE-
VERSEDRIVEBELTTENSION
(Model 634A 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 disconnectspark 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 until the 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: Measurecable 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 adirty, 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 oillevel beforeeachuse
and after everyfive hours of continuous
operation. Runningthe engine when it is
low on oil will quickly ruin theengine.
It is recommendedthat you changethe
motor oil afterevery 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).
2O