Troy-Bilt 665B - Manual (Page 19)

Section 5: Maintenance 19
CHECKING AND ADJUSTING
TENSION ON CLUTCH BELTS
Maintaining correct belt tension is impor-
tant to good tilling performance and long
belt life. A loose belt will slip on the
engine and transmission pulleys and
cause the tines and wheels to slow down
– or stop – even though the engine is
running at full speed. A loose belt will
also result in premature belt wear.
While checking belt tension, also check
for cracks, cuts or frayed edges. A belt in
poor condition should be replaced.
Tension on a new forward clutch belt (C,
Figure 5-8) should be checked after the
first two (2) hours of operation and after
every ten (10) hours of operation.
The reverse clutch belt (D, Figure 5-9),
because it is used more sparingly, may
not require tension adjustment until a sig-
nificant number of operating hours has
passed. A tension adjustment is required
only if there is little or no reverse move-
ment when the Reverse Clutch Control
knob is pulled out.
Checking and Adjusting
Forward Clutch Belt Tension
It is important to maintain correct tension
on the forward clutch 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
loose belt will also result in premature belt
wear.
• Check belt 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.
A belt in poor condition should be
replaced.
Checking Forward Belt Tension
1. Before checking, shut off engine, allow
the engine and muffler to cool down, dis-
connect the spark plug wire, remove the
ignition key on electric start models.
2. The coiled part of the forward clutch
spring (E, Figure 5-10) measures 2" in
length when the Forward Clutch Control
levers are not pulled up. Pull either
Forward Clutch Control Lever up against
the handlebar and measure the length of
the coil on the forward clutch spring.
Tension is correct if the length of the
extended coil is 2-1/2" (see Figure 5-11).
The forward clutch control cable needs
adjustment if the extended length of the
coil is not 2-1/2". See Adjusting the
Forward Clutch Belt for a procedure.
Adjusting the Forward Clutch Belt
Do this procedure if the forward clutch
spring measurement is not correct (see
Checking Forward Belt Tension)
1. Before adjusting the belt tension, shut
off engine, allow the engine and muffler to
cool down, disconnect the spark plug
wire, and remove the ignition key on elec-
tric start models.
2. Belt adjustments are done with the
forward clutch cable adjuster (F, Figure 5-
10). Use two 1/2", open-end wrenches to
loosen the two jam nuts (A, Figure 5-12) a
few turns.
3. Move cable adjuster (B, Figure 5-12)
downward for more belt tension (see
Figure 5-12).
4. Hand tighten the jam nuts and pull the
Forward Clutch Control levers up against
the handlebar. Measure the coiled part of
the spring (Figure 5-11). The length of the
extended coil should be 2-1/2". Repeat
this procedure until the extended spring
length is correct.
5. Tighten both jam nuts securely.
Before inspecting, cleaning or servicing the machine, shut off engine, wait for all moving parts to come to
a complete stop, remove ignition key on electric start models, disconnect spark plug wire and move wire
away from spark plug.
Failure to follow these instructions can result in serious personal injury or property damage.
WARNING
Figure 5-10: Location of forward clutch cable
spring (E) and forward cable adjuster (F).
Follow the belt adjustment instructions
carefully. An incorrect adjustment could
result in the clutch control mechanism
engaging too soon. This could cause
loss of tiller control and result in per-
sonal injury or property damage.
WARNING
Figure 5-8: Forward clutch belt. (C, Left-
side view, no belt cover.)
Figure 5-9: Reverse clutch belt. (D).
(Right-side view, no belt cover.)
C
D
E
F
Incorrect cable adjustment could cause
the wheels and tines to rotate unexpect-
edly. Follow adjustment procedures
carefully. Failure to do so could result in
personal injury or property damage.
CAUTION