Checking And Adjusting Forward Drive Belt Tension; To Check Forward Belt Tension - Troy-Bilt TUFFY 634BM Operator's Manual

WARNING: Beforeinspecting, cleaning or servicing the machine,shut off engine, wait for all
moving parts to come to a complete stop, disconnect spark plug wire and move wire away from
spark plug. Failureto follow these instructions can result in serious personalinjury or property
damage.
FF_ONTi
FORWARD
SHAFT
C
\
h Unthread the hex nut IC, Figure5-4)
halfway up the adjustment screw (D_.
c. Unhook the top of the spring from
the Forward Clutch Bail.
d. Use pliers to prevent the adjuster (B_
from turning and turn the slotted screw lo-
cated insidethe spring clockwise ,viewed
from operator's position} to increase ten-
sion on the spring. Turn the screw coun-
terclockwise to decreasetension. Once
adjusted, reattach the spring to the For-
ward Clutch Ba_l.
e. RepeatSteps 2 and 3 to re-measure
the length of the spring. Whenthe second
measurementis between1/16"-to- 3/16"
longerthan the first measurement,retighten
the hexnut(C)againstthetop ofthe adjuster
(B/.
Figure 5-3: Installtinessothatcutting edgeoftinesentersoftfirstwhentillermoves forward.
CHECKING AND ADJUSTING
FORWARD DRIVE BELT TENSION
It is important to maintain correct tension
on the forward drive belt. A loose beltwill
causethe tines and wheelsto slow down--
or stop completeiy -- even though the en-
gine _srunning at full speed. A too tight
belt can result in unintentional tine move-
ment when the clutch bail is in the Neutral
(released) position.
• Check belt tension after the first two
hours of break-in operationand after every
10 operating hours.
• At the end of eachtilling season,check
the belt for cracks, cuts or frayed edges
and replace it as soon as possible.
To CheckForwardBelt Tension:
1. Stop engine, wait for all parts to stop
mowng and disconnect spark plug wire.
2. With the Forward Clutch Bail in an open
(releasedl position,measureand note the
overall length of the cable spring (A, Figure
5-4) by measuring from the outermost coil
to the outermost coil.
3. Squeezethe Forward Clutch Bail
againstthe handlebar(seeFigure5-4) and
ReplacementBelt Information
If the drive belt needsto be replaced, see
belt tension is correct if this second mea- your local authorized dealer or refer to the
suremenl is between 1/6' -to- 3/16"longer Parts List for ordering information. Use
than the first measurement, only a factory-authorized belt as an "over-
4. If the spring Lstoo short tless than 1/ the-counter" belt may not perform satis-
16'1.the tension is too loose. If the spring factorily. The procedure requires average
is too long _morethan 3/16'h. the tension mechanicalability and commonly available
tools.
is too tight.
5. To adjust the length of the spring:
a. Releasethe Forward Clutch Bail.
Figure5-4: Tocheckforwardbelt tension, take twomeasurementsof the
nverell length ofthe coilsin the spring-- first with the clutchbail open,
then with the clutchbail closedagainst the handlebar.
re-measure the length of the coils. The
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