R&M Materials Handling WIRE ROPE HOISTS Service - Manual (Page 70)

R&M Materials Handling, Inc.
4501 Gateway Boulevard
Springfield, Ohio 45502
P.: (937) 328-5100
FAX: (937) 325-5319
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R&M Materials Handling, Inc. reserves the right to alter or amend the above information without notice.
5.26.3 Adjusting holding brake
1. Brake rim
2. Detent arm
4. Shaft of the detent arm
15. Holding brake limit switch
16. Solenoid
1.Assemble the brake rims (1) together with disc springs (24, 10 pcs) and screws (25). All the disc
springs must be placed so that the concave sides are facing in to the brake rim.
2.In the two brake rims model the connection points of the halves of both rims shall not be aligned, they
must be 90 degrees apart. The 90 degrees placement is to reduce the risk of having two bolt connection
teeth being contacted simultaneously by the detent arm.
3.Adjust the rims so that there is a difference of 5 mm (0.2”) between the teeth of the two brake rims. The
5 mm difference is to allow one rim to begin the braking before the second rim engages to reduce the
dynamic impact.
4.Tighten the brake rim screws (25) to a torque of 60 Nm (44 ft lb).
5.Check with the caliber that the gap between the brake rim halves is the same on both sides. This is to
ensure the even tooth to tooth distances over the brake rim connection.
6.Adjust the holding brake limit switch (15) to be mechanically activated by the cam of the detent arm,
when the solenoid de-energized.
7.Check that the detent arm (2) is touching the brake rim when the hoist is idle. When the solenoid is
activated check that there is a clearance between teeth and detent arm.
8.Manually activate the holding brake limit switch when operating in down direction and verify that
hoisting is stopped in the down direction. Up direction should continue to operate.
5.26.4 Overspeed Brake
Overspeed brake prevents the rope drum from an overspeed condition. Overspeed can occur when a
component in the transmission or drive train fails and the load on the hook is heavy enough to cause an
overspeeding of the drum.
!
In case the drum brake activates due to overspeed, always contact a representative of the
hoist manufacturer. The hoist must not be used before the cause for an overspeed has been