Troy-Bilt 634FM Tiller User Manual


 
WARNING: Beforeinspecting, cleaningor servicingthe 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 can result in serious personalinjury or property
damage.
FF_ONTi
FORWARD
SHAFT
C
\
h Unthreadthe hexnut IC, Figure5-4)
halfway upthe adjustment screw (D_.
c. Unhookthe top of the spring from
the Forward ClutchBail.
d. Usepliersto preventtheadjuster (B_
from turning and turn the slotted screwlo-
cated insidethe spring clockwise ,viewed
from operator's position} to increaseten-
sion on the spring. Turnthe screw coun-
terclockwise to decreasetension. Once
adjusted,reattachthe spring to the For-
ward Clutch Ba_l.
e. RepeatSteps2and3to re-measure
thelengthofthespring. Whenthe second
measurementis between1/16"-to- 3/16"
longerthanthefirst measurement,retighten
thehexnut(C)againstthetop oftheadjuster
(B/.
Figure5-3: Installtinessothatcuttingedgeoftinesentersoftfirstwhentillermovesforward.
CHECKING AND ADJUSTING
FORWARD DRIVE BELT TENSION
It is important to maintain correct tension
on the forward drive belt. Aloose beltwill
causethetinesandwheelsto slow down--
or stop completeiy -- eventhough the en-
gine _srunning atfull speed. A too tight
belt canresult in unintentionaltine move-
ment whenthe clutch bail is inthe Neutral
(released)position.
Checkbelttension after the first two
hoursof break-inoperationand after every
10operating hours.
At the end of eachtilling season,check
the beltfor cracks,cuts or frayed edges
and replaceit assoon as possible.
ToCheckForwardBeltTension:
1. Stop engine,wait for all partsto stop
mowng anddisconnect spark plug wire.
2. With the ForwardClutchBailinan open
(releasedl position,measureand notethe
overalllengthofthecablespring (A,Figure
5-4) bymeasuringfrom the outermost coil
to the outermost coil.
3. Squeezethe ForwardClutch Bail
againstthe handlebar(seeFigure5-4)and
ReplacementBelt Information
If the drive belt needsto be replaced,see
belttension is correct ifthis second mea- your localauthorized dealeror referto the
suremenl is between1/6' -to-3/16"longer Parts List for ordering information. Use
than the first measurement, only afactory-authorized beltasan "over-
4. If the spring Lstoo short tless than 1/ the-counter" belt may not perform satis-
16'1.thetension is too loose. Ifthe spring factorily. The procedurerequiresaverage
is too long _morethan 3/16'h.the tension mechanicalability andcommonly available
tools.
is too tight.
5. Toadjust the length of the spring:
a. Releasethe Forward ClutchBail.
Figure5-4: Tocheckforwardbelttension,taketwomeasurementsofthe
nverelllengthofthecoilsin thespring-- firstwiththe clutchbail open,
thenwith theclutchbail closedagainstthehandlebar.
re-measurethe length of the coils. The
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