R&M Materials Handling WIRE ROPE HOISTS Service - Manual (Page 72)

R&M Materials Handling, Inc.
4501 Gateway Boulevard
Springfield, Ohio 45502
P.: (937) 328-5100
FAX: (937) 325-5319
72/130
R&M Materials Handling, Inc. reserves the right to alter or amend the above information without notice.
- Check that the positioning of the limit switch is correct and will be contacted by the follower roll. The gap
between the follower roll and limit switch is to be 0.5 mm measured on the cam wheel’s highest point. Refer to
the Drum Brake Adjusting instructions.
- 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.
• Detent arm
- Check that the arm rotates easily on its shaft.
5.26.5.1 Should An Overspeed Occur – Service after an emergency braking
Should an overspeed braking occur, the hoist and overspeed brake shall be inspected, repaired and
adjusted prior to further use of the hoist.
#
Extreme caution must be taken and the load must be removed from the hook of the hoist.
5.26.5.2 Overspeed Condition – Find Fault
• Find the reason for drum brake emergency braking. An overspeed occurs because of a failure in the
drive transmission system of the hoist. Possibilities - The hoist brake has worn (steel on steel) / a
coupling has sheared / a gear in the gearbox has stripped / a drive shaft has broken.
5.26.5.3 Hoisting unit inspection after overspeed
• Check the condition of the hoisting gear(s) and drum gear rim
- No abnormal noises when driving
- Check that the gear rim fitted inside the drum has not slipped
• Disassemble motor and check the condition of spline on motor shaft and on gear’s primary shaft
- No deformations or broken teeth allowed
• Change the coupling between the motor and gear
• Change the motor fixing bolts
5.26.5.4 Hoisting Machinery inspection after overspeed
• Check the rope drum
- Check the rope grooves visually for any markings from the rope guide or wire rope
- Check that there is no damage to rope end connection fixing parts
• Check the rope guides for damage
- Check the body of rope guide for deformations
- Check the guiding surface visually
• Change the drum end plate on hoisting machinery side
• Check the drum end plate on drum brake side
- Change drum end plate if any deformations or cracks are found. Pay special attention to hoisting unit support
plates and to the area near the fixing point of the lower corner of the hoisting unit. If any bends or cracks are
found the support plates must also be changed.
• Change the hoisting unit fixing bolts
• Change the fixing bolts of intermediate beams
5.26.5.5 Load beam inspection after overspeed
• Check the load beam