R&M Materials Handling WIRE ROPE HOISTS Service - Manual (Page 75)

R&M Materials Handling, Inc.
4501 Gateway Boulevard
Springfield, Ohio 45502
P.: (937) 328-5100
FAX: (937) 325-5319
75/130
R&M Materials Handling, Inc. reserves the right to alter or amend the above information without notice.
3. Cam wheel
4. Follower roll
6. Roll for limit switch
7. Shaft of detent arm
15. Over speed limit switch
21. Helical spring
24. Disc springs
25. Screw
26.Marking point
27. Only in models with drum diameter 608 mm with 2 hoisting motors
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 by the detent arm when an overspeed braking occurs.
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. Adjust the cam wheel (3) so that when the follower roll (4) is on the highest point of the cam wheel
there is a clearance of 3 mm (0.12”) between the head of the detent arm and the tooth of the brake
rim. If the cam wheel is replaced, position the cam wheel by turning it until the marking point on the
brake rim is aligned with the contact point of the cam wheel halves.
5. Adjust the gap between the limit switch (15) and the roll (6) to 0.5 mm (0.02”). Make this adjustment
when the follower roll is on the highest level of the cam wheel.
6. Adjust the length M of the helical spring (21) to the value recorded on the Q drum brake report
included in the delivered hoist documentation. The follower roll must be at the highest point on the
cam wheel when the length of the spring is measured. Be aware that the spring must not be
damaged. If damaged, replace the spring. Verify the spring type from the Q drum brake report.
7. Verify that the brake rim screws are loose allowing the brake rims to slide freely on the drum during
the following test.
8. Test that the overspeed drum brake does not actuate when lowering the nominal load with full speed.
If the drum brake activates, increase the M dimension to increase the follower roll tension on the cam
wheel preventing premature drum braking action. Before repeating test verify that all rim and cam
wheel positioning marks are correct according to steps 3, 4 and 5.
9. After successful testing tighten the brake rim screws (25) to a torque of 60 Nm (44 ft lb).
10. Check with the caliber that the gap between the brake rim halves is the same on both connections.
This is to ensure the even tooth to tooth distances over the brake rim connection.
11. Manually activate the limit switch when operating in down direction and verify that hoisting is stopped
in the down direction. Up direction should continue to operate.