Hoist Motor Brake Adjustment - R&M LM Installation And Maintenance Manual

LM10 I&M MANUAL/EN/11.30.2010

7.4.2 Hoist Motor Brake Adjustment

Figure 11. Cross Section of Hoist Motor Brake
If maximum air gap of brake has been reached or will be exceeded before next inspection, readjust air gap.
X = 0.008" [ 0.2 mm ]
Before adjusting brake, remove load. Per ANSI Z244.1, lockout and tag main disconnect switch in de-
energized position. Follow other maintenance procedures outlined in this manual and ASME B30.16.
1. Remove brake cover and gasket.
2. With a feeler gauge, check three (3) places near each mounting bolts to measure air gap ( X )
between brake thrust disc (item 7) and coil (item 6).
3. To adjust air gap use a 0.008" feeler gauge and proceed as follows:
A. Slightly loosen motor brake mounting screws (item 10), so that adjusting nut (item 11) still
touches brake housing.
B. To reduce air gap, turn adjusting nut (item 11) counterclockwise.
C. To increase air gap, turn adjusting nut (item 11) clockwise.
D. Check air gap after adjusting the brake. Make certain the (3) screws (item 10) are tightened per
Torque specification. See Section 8.4.
4. Check brake operation. Run load block up and down several times without a load to test operation of
brake. Then, lift a capacity load about one foot above floor, stop, and check that brake holds load.
5. Install gasket and brake cover.
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Minimum air gap Maximum air gap
X = 0.020" [ 0.5 mm ]
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