7
Inspection and maintenance
03.2018
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7.4
Hoist motor brake (RSM)
This inspection and maintenance is of particularly important to ensure safety.
If brake maintenance is not performed correctly or the brake does not function correctly,
the load may fall!
WARNING
Falling load hazard.
➢
Carry out work on the hoist brake only when the hoist is unloaded and the bottom
hook block has been set down.
➢
Before starting disconnect power and implement a Lockout/Tagout (LOTO) procedure
before servicing the equipment.
7.4.1
Checking brake
1.
Remove fan cover (1)
2.
Remove plug (2)
3.
Measure air gap (S) with feeler gage (F).
NOTE:
When measuring, ensure that the feeler gage is pushed in at least as far as
depth
“a”
(see Tab. 30) and does not catch on shoulder (!). See Tab. 30 for max.
permissible air gap (S). The brake is not adjustable. If the max. permissible air gap
(S) has been reached, the brake disk (brake rotor) must be replaced.
7.4.2
Replacing brake disk (brake rotor)
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 disk (brake rotor) (7)
7.
Clean brake (wear a dust protection mask)
8.
Check friction surfaces for wear
9.
Push new brake disk (brake rotor) (7) onto hub (8) and check radial play. If there is
increased play in the gearing between brake disk (7) and hub (8) the hub (8) must be
pulled off the motor shaft and replaced.
10.
Check torsional backlash of motor shaft. If the play is above 3°, check rotor hub and
shaft and replace worn parts.
NOTICE
Material damage hazard.
Always contact the manufacturer before removing the hub (8).
“A”
Fig. 72
11.
Replace in reverse order.
12.
Ensure that the check hole for measuring the air gap is underneath.
13.
Observe tightening torques of fixing screws (4) (see following table).
Hoist motor type
Hoist brake
Smax.
a
Tightening torque
[in]
[in]
[lb
f
ft]
12/2H73
RSM150
0.063
1.2
16
24/4H92
RSM500
0.079
1.6
33
Tab. 30
14.
Check brake data according to rating plate on hoist motor!