American Dryer Corp. Phase 5 Microprocessor AD-170 - Manual (Page 30)

26
F. Pulleys
To Replace Tumbler Pulley
1. Loosen V-belts. Rotate pulley and roll V-belts out of
grooves.
2. Remove cap screws from the bushings.
3. Insert cap screws in tapped removal holes and tighten
evenly until bushing becomes loose on shaft.
See figure "A".
4. Remove bushing, pulley, and key.
5. Assemble bushing and sheave as shown in figure "B".
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 30ft-lbs. 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 Small Idler Pulley
1. Loosen V-belts. Rotate pulley and roll V-belts out of
grooves.
2. Remove cap screws from the bushings.
3. Insert cap screws in tapped removal holes and tighten
evenly until bushing becomes loose on shaft.
See figure "A".
4. Remove bushing, pulley, and key.
5. Assemble bushing and sheave as shown in figure "B".
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.