American Dryer Corp. AD-758 - Manual (Page 31)

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F. PULLEYS
To Replace Basket (Tumbler) Pulley
1. Loosen V-belts. Rotate pulley and roll V-belts out
of grooves.
2. Remove cap screws from the bushing.
3. Insert cap screws in tapped removal holes and tighten
evenly until bushing becomes loose on shaft. (Refer
to 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 30 ft-lbs.
(133.4 newtons). 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 bushing.
3. Insert cap screws in tapped removal holes and tighten evenly until bushing
becomes loose on shaft. (Refer to 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.