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7.2.3 SHEAVE ALIGNMENT
Although model BXM32 is illustrated, the procedures can be applied to all models in this manual. A set of v belts
transmits rotational power to the rotor. They must be kept properly tensioned and the sheaves aligned to obtain the
expected performance and life.
For maximum accuracy, have your sheaves aligned with a laser alignment tool. Contact your dealer for information
Fig. 21 BELT DRIVE
SYSTEM
on laser alignment.
Alignment may be carried out using a straight edge, to
check the alignment, follow this
procedure:
1. Disengage the PTO, stop the engine, remove the
ignition key and place it in your pocket and wait for
all moving parts to stop
2. Clear the area of bystanders, especially small
children.
3. Remove the 4 bolts that secure the belt guard, and
remove the guard.
4. Have a straight edge at least 30" (76cm) in length.
5. Place the straight edge along the face of the PTO
sheave, and place the opposite end along the face
of the rotor sheave.
6. Check to see if there is a gap between the straight
edge and the clutch or the sheave, measure the
gap (A).
7. If there is more than 1/32" (.8mm) offset then ad-
justment is required.
8. To adjust alignment:
a. Loosen the set screw on the bushing attached
to rotor sheave.
b. Remove the 3 hex bolts on the bushing, and
thread them into the tapped holes on the bush-
ing.
c. Tighten the hex bolts progressively with 1/4
turns until bushing is free from the sheave
taper.
d. Move the sheave to the required position
to align the belt.
e. If the offset is 1/32 (.8mm) or less then no
more adjustment is necessary.
f. Align drilled holes with tapped holes on the
sheave, replace and hand tighten the 3 hex
bolts.
g. Tighten the set screw and recheck alignment.
h. Carefully tighten hex bolts progressively (1/4
turns) and uniformly until firmly seated.
i. Recheck belt tension and assemble belt
guards.
Note: movement of the
sheave may occur when
tightening the bushing, some
allowance for movement
may be required.
PTO
Sheave
A
Rotor
Sheave
Straight
Edge
A
Set Screw
Bushing
Rotor
Sheave
PTO
Sheave
Belt Drive
Straight
Edge
Top view of belt drive system
Summary of Contents for BXM32
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