27
7. Tighten cap screws progressively. There should remain a gap between the sheave hub and the flange of the
bushing.
IMPORTANT: Tighten screws evenly and progressively . Never allow the sheave to be drawn in
contact with the flange of the bushing. This gap should measure from 1/8” to 1/4”.
Proper cap screw torque is 6 ft-lbs. (8 Nm), if greater tightening forces are applied,
excess pressures will be created in the hub of the mounted sheave which may cause it
to crack.
To Replace Large Idler Pulley1. Loosen V-belts. Then, rotate pulley and roll V-belts
out of grooves.
2. Remove cap screws.
3. Insert cap screws in tapped removal holes and tighten
evenly until bushing becomes loose on shaft. Refer to
figure “A” on previous page.
4. Remove bushing, pulley, and key.
5. Assemble bushing and sheave as shown in figure “B” on previous page (page 26). When cap screws are
loosely inserted, bushing remains fully expanded to provide a sliding fit on the shaft.
6. Insert key on the shaft, then slide sheave to desired position with cap screw heads to the outside.
7. Tighten cap screws progressively. There should remain a gap between the sheave hub and the flange of the
bushing.
IMPORTANT: Tighten screws evenly and progressively . Never allow the sheave to be drawn in
contact with the flange of the bushing. This gap should measure from 1/8” to 1/4”.
Proper cap screw torque is 15 ft-lbs. (20 Nm). If greater tightening forces are
applied, excess pressures will be created in the hub of the mounted sheave which
may cause it to crack.
To Replace Motor Pulley1. Loosen V-belts. Rotate pulley and roll V-belts out
of grooves.
2. Remove cap screws from bushing.
3. Insert cap screws in tapped removal holes and
tighten evenly until bushing becomes loose on shaft.
Refer to figure “A” on previous page.
4. Remove bushing, pulley, and key.