ADC ML-190, ML-175 service manual Tumbler Alignment, Bearings, To Replace Motor Pulley

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.-lb. 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 Pulley

Discontinue electrical power to the dryer. Remove the lint drawer.

Remove the lint door.

Loosen V-belts, then rotate pulley and roll V-belts out of its’ grooves.

Remove cap screws from bushing.

Insert cap screws in tapped removal holes and tighten evenly until bushing becomes loose on shaft. Refer to figure “A” on the previous page.

Remove bushing, pulley, and key.

Assemble bushing and sheave as shown in figure “B” on the previous page. When cap screws are loosely inserted, bushing remains fully expanded to provide a sliding fit on the shaft.

Insert key on the shaft, then slide sheave to desired position with cap screw heads to the outside.

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.-lb., if greater tightening forces are applied, excess pressures will be created in the hub of the mounted sheave, which may cause it to crack.

Tumbler Alignment

Discontinue electrical power to the dryer. Remove the lint drawer.

Remove the lint door.

Remove both the left hand and right hand lint coop walls.

Loosen the V-belts on drive shaft, then rotate pulley and roll V-belts out of its’ grooves.

Tighten the two bolts under the drive shaft clockwise to raise the tumbler and counterclockwise to lower the tumbler. The bolts should be tightened in even increments in order to ensure that the shaft runs parallel with the base of the dryer.

IMPORTANT: Side to side adjustment of the tumbler should be equal on either side of the front panel, but vertically the top of the tumbler should have a larger gap than the bottom to compensate for the load.

Be sure to tighten the left idler side to the same height as the right side/drive side. This length can be determined by taking measurements from the bottom of each pillow block bearing to the top of the bearing pad.

NOTE: If the axle height is not the same on the drive and idler side, then the tumbler will be either more to the right or left side, depending on which axle is higher.

Tighten locking nuts on the adjustment bolts. Reverse the first five steps for reassembly.

Check tumbler drive belt for proper tension. Adjust if necessary.

Reestablish electrical power to the dryer.

Bearings

To Replace Drive/Idler Shaft Pillow Block Bearings

Discontinue electrical power to the dryer. Remove the lint drawer.

Remove the lint door.

Loosen and roll V-belts off that connect speed reducing shaft to drive shaft.

Place a piece of wood between the tumbler and wrapper to support the tumbler when shaft is removed.

Remove the four bolts holding the drive shaft assembly in the dryer.

Remove cap screws from bushing of drive wheel.

Insert cap screws in tapped removal holes and tighten evenly until bushing becomes loose on shaft.

Remove bushing and key. Remove wheel from shaft.

Loosen the four setscrews in the pillow block bearings.

16 American Dryer Corporation 450431 - 3