5 Inspection and maintenance
LS Open Loop Vector Motor 4H42, 4H71, 4H72 Manual Supplement
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August 2022
Page 18
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5.3
Checking the hoist motor brake
WARNING
Danger to life, injury or material damage due to improper inspection of the hoist motor
brake.
Work on the hoist motor brake must only be carried out on the unloaded wire rope
hoist and with the bottom hook block lowered.
Switch off the crane-supply-switch and secure against being switched on again.
Secure the danger zone.
Keep a sufficient safety distance from the product.
(4) Sealing ring
(5) Fastening screws
(6) Stopping plug
(7) Hub
(8) Brake rotor
(9) Anchor plate
(10) Coil carrier
1.
Remove the cover and fan.
2.
Remove stopping plug (6) with pliers.
3.
Measure the air gap “S” with a feeler gauge “b”.
–
When measuring, the feeler gauge “b” must be inserted at least to the insertion
depth “a” (see table). The feeler gauge must not get caught on the step. Refer to
the table for the maximum permissible air gap “S”.
Hoist motor type
Hoist motor brake
Max. air gap “S”
Insertion depth “a”
[mm]
4H42-LS
RSM 16
0.4
25
4H71-LS
RSM 32
0.45
25
4H72-LS
RSM 60
0.8
25
The hoist motor brake is not readjustable. Once the max. permissible air gap “S” has
been reached, the brake rotor (10) must be replaced.
Summary of Contents for 4H42
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