Harrington Hoists and Cranes RHN - Rhino Wire Rope Hoist - Manual (Page 54)

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6.3 Hoist Motor Brake
6.3.1 To keep your hoist working in optimum condition and prevent possible down time, it is recommended to check
your motor brake at regular intervals. Intervals must be adapted in accordance with the application.
6.3.2

Before proceeding, ensure that the electrical supply for the hoist or trolley has been
de-energized (disconnected). Lock out and tag out in accordance with ANSI Z244.1 “Personnel
Protection –Lockout/Tagout of Energy Sources”. The hoist must be unloaded and the bottom hook block
set down.
6.3.3 Motor Brake Check:
1) Remove fan cover (1). See Figure 6-1 .
2) Remove plug (2). See Figure 6-1 .
3) Measure air gap (S) with feeler gauge (F). When measuring, ensure that the feeler gauge is pushed
in at least as far as depth "a" and does not catch on shoulder. See Table 5-8 for max. permissible air
gap (S). See Figure 6-2 .
4) The brake is not adjustable. If the max. permissible air gap (S) has been reached, the brake disc
(brake rotor)must be replaced. See Figure 6-2 .
6.3.4 Brake Rotor Replacement - See Figure 6-1 .
1) Remove fan cover (1).
2) Pull off fan wheel (3), remove feather key
3) Disconnect brake
4) Unscrew fixing screws (4)
5) Remove magnet piece (5) together with armature disc (6)
6) Remove brake disc (brake rotor) (7)
7) Clean brake (wear a dust protection mask)
8) Check friction surfaces for wear
9) Push new brake disc (brake rotor) (7) onto hub (8) and check radial play. If there is increased play in
the gearing between brake disc (7) and hub (8) the hub (8) must be pulled off the motor shaft and
replaced.
10)

Danger of damage - Always contact the manufacturer before removing the hub (8).