Manual

,_ WARNING: Beforeinspecting, cleaning or servicing the machine,shut off engine, wait for all
moving partsto come to a completestop, disconnectspark plug wire and move wire awayfrom
spark plug. Failureto follow these instructions can result in serious personal injury or property
damage.
FORWARDCLUTCH
BAIL ADJUSTMENT
If the Forward Clutch Baildoes not func-
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 LLC or your authorized
dealerfor service advice.
CHECKINGANDADJUSTINGRE-
VERSEDRIVEBELTTENSION
(Models643B & 645A only)
It is important to maintain correct tension
on the reversedrive belt. A loose belt will
causethe tines andwheelsto slow down -
or stop completely - eventhough the en-
gine is running at full speed.
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 andafter every
10 operatinghours.
ToCheckReverseBeltTension:
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 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. Measurethe length
of the cable wire betweenthe end of the
threaded cableadjuster (A,Figure5-5) and
the end of the Z-fitting (B)to which the ca-
ble wire is attached.
4. Thebelt tension is idealif the cablewire
length measuresbetween1/8"to 1/4".If it is
lessthan 1/8"(andif there isno reverseac-
tion whenthe tiller is running),then make
the following adjustments
NOTE:Ifthe lengthis morethan 1/4",noad-
justment is needed--as long asthe reverse
actionfunctions properly.
5. Releasethe ReverseClutchControl
knob.andthen unthread the inner jam nut
(C, Figure 5-6) oneto two turns. Pull the
threaded cable adjuster (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 repeatingStep 3.
Readjust as neededby repeating Steps 5
and 6.
8. Reinstall the 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 refer to the
Parts List for ordering information. Use
only a factory-authorized belt as an "over-
the-counter" belt may not perform satis-
factorily. The procedure requires average
mechanicalability andcommonly available
tools.
ENGINECLEANING
Keepingthe engineclean will 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 is cool beforeservicing the
engine.
AIRCLEANERSERVICE
The air cleanerfilters dirt and dust out of
the air before it enters the carburetor.Op-
erating the enginewith a dirty, clogged air
filter can causepoor performanceand
damageto the engine. Neveroperatethe
enginewithout the air cleanerinstalled. In-
spect and service the air cleaner more of-
ten if operating in very dusty or dirty
conditions. Referto the engine Owner's
Manualfor air cleanerservice intervalsand
instructions.
ENGINEOIL SERVICE
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.
It is recommendedthat you changethe
motor oil after every 10hours of operation
and even soonerwhen operating in ex-
tremely dirty or dustyconditions. Referto
the EngineOwner'sManualfor detailed
service instructions.
A. ToCheckthe EngineOil Level:
1. Parkthetiller ona levelareaandshut off
the engine.
2. Levelthe engine (use the Depth Regula-
tor Leverto adjust the engineangle).
2O