Skip creeps when stopped or overruns its stops — the brake
Symptom
The loaded skip creeps down when stopped, stops later than usual at the limits, overruns the top, runs slower than usual, or the brake motor runs hot.
Likely causes
- Brake lining worn, or air gap out of adjustment.
- Brake not releasing fully, so it drags and burns the lining.
- Brake coil or rectifier failing.
- Limit switch moved, dirty or bent; speed change switch failed.
Most likely and cheapest to check first.
Checks
- Holding test - stop the loaded skip mid-track; it must not creep.
- Watch the stopping position at each limit; it should be the same every time.
- Locked out, measure the air gap and lining thickness against the motor maker's values.
- Test the top over-run switch monthly as the maker describes.
Fix
- Adjust the air gap or reline the brake at once.
- Replace the brake coil or rectifier.
- Reset or replace limit switches; guard them from material.
- Repair the speed change so the skip arrives slowly at the top and bottom.
Stop the equipment if
The skip creeps or overruns. It does not run again until the brake or switch is repaired.
Parts you may need
The brake holds the skip, not the motor
The brake is applied by springs and released electrically, so a power failure or an E-stop stops and holds the skip. That only works if the lining and the air gap are right.
DANGERNever release the brake by hand with the skip raised and unsecured. Manual release lets the skip run down. Release by hand only under a written procedure, with the skip propped or at the bottom.
⚠ Every check inside a machine starts with full lockout. Safety disclaimer