Troy-Bilt Tuffy 630B Operator's Manual page 19

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_Betore inspecting, cleaning or servicing the machine, shut off engine, wait for all moving parts to
I l Icometea
complete stop, disconnect sparkplug wire and move wire away from spark plug.
I !lmK_ I Failure to follow those instructionscan result in serious personal injury or property damage,
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H'
I
_NE
SHAFT
ENGINE
A
D
E
B
Figure 5-3: Installtinessothatcutting edgeoftinesentersoilfirstwhen tiller moves forward.
CHECKING AND ADJUSTING
FORWARDDRIVE BELTTENSION
It is important to maintain correct tension
on the forward drive belt. A loose belt will
cause the tines and wheels to slow down -
or stop completely - even though the
engine is running at full speed. A too tight
belt can result in unintentional tine move-
ment when the clutch bail is in the Neutral
(released) position.
• Checkbelt tension after the first two
hours of break-in operation and after
every 10 operating hours
• At the end of each tilling season, check
the belt for cracks, cuts or frayed edges
and replace it as soon as possible
measurement is between 1/16" -to- 3/16'
longer than the first measurement
4. If the spring is too short (less than
1/16"), the tension is too loose. If the
spring is too long (more than 3/16"), the
tension is too tight.
5. To adjust the length of the spring:
a. Releasethe Forward Clutch Bail.
b. Unthread the hex nut (C, Figure5-4)
about halfway up the adjustment
screw (D).
c. Unhookthe top of the spring from
the Forward Clutch Bail.
d. Use pliers to prevent the adjuster (B)
from turning and turn the slotted
screw located inside the spring
clockwise (viewed from operator's
position) to increase tension on the
spring. Turn the screw counter-
clockwise to decreasetension. Once
adjusted, reattach the spring to the
Forward Clutch Bail.
e. RepeatSteps 2 and 3 to re-measure
the length of the spring. Whenthe
second measurementis between
1/16" -to- 3/16" longer than the first
measurement,retightenthe hexnut
(C) against the top of the adjuster (B).
ReplacementBelt Information
If the drive belt needs to be replaced, see
your local authorized dealer or refer to the
Parts List for ordering information. Use
only a factory-authorized belt as an "over-
the-counter" belt may not performsatis-
factorily. The procedure requires average
mechanicalability and commonly available
tools.
To Check ForwardBelt Tension:
1. Stop engine, wait for all parts to stop
moving and disconnect spark plug wire.
2. With the Forward Clutch Bail in an
open (released) position, measure and
note the overall length of the cable spring
(A, Figure5-4) by measuring from the out-
ermost coil to the outermost coil.
3. Squeezethe Forward Clutch Bail
against the handlebar (see Figure 5-4) and
re-measure the length of the coils The
belt tension is correct if this second
Figure 5-4: Tocheckforward belttension, t aketwomeasurements of
theoveralllength of thecoilsin thespring - firstwiththeclutchbail
open,thenwiththeclutch bailclosed againstthehandlebar.