17
Model H40B –
See Figure 10.
Take special care to make sure that the belt is placed between the brake stud and the idler pulley.
With the clutch engaged, adjust the nuts on the spring-loaded idler adjuster bolt until the length of
the spring is approximately 2-3/4”. The running spring length should be maintained between 2-
3/4” and 3-1/4”. For maximum belt life, periodic checks should be done to make sure the spring
length has not exceeded the maximum recommended running length.
Note:
Failure to periodically adjust the belt tension will result in severe belt wear and
premature belt failure.
Figure 10: Belt Pattern and Spring Adjustment (Model H40B)
This model comes with a belt brake, which is a safety feature that stops the blades from turning
after the clutch is disengaged. The only time the brake should be in contact with the belt is when
the clutch is disengaged.
CAUTION:
The brake stud may need to be adjusted if there is significant belt wear or if a
different size belt is used. If the brake stud is not adjusted correctly, the blades will still
spin even though the clutch may be in the disengaged position. Always shut mower
engine off before servicing.
Under normal operating conditions the brake stud should require very little adjustment. Periodic
brake stud inspections should be performed. There are two parts to inspecting the brake stud.
Those two inspections are the disengaged spring length and brake stud clearance.
No Less Than 1/2” Clearance
With Clutch Engaged
0” With Clutch Disengaged
Brake Stud
Clutch Engaged Spring
Length 2-3/4” to 3-1/4”
Clutch Disengaged Spring
Length 3-1/4” to 4”
Clutch Arm
Engine
Front
Clutch Engagement
Only Include
Spring in
Measurement
