Main signs of wear in a hoist

Hoists work under repeated loads and signal wear before they fail. Recognising these signs allows the work to be scheduled during a planned shutdown rather than facing unplanned downtime.

Unusual noise and vibration

Operators notice changes in sound before any instrument does. Cracking during lifting, intermittent metallic noise, juddering at the start of movement or a new hum in the motor deserve to be logged and inspected. A change in sound almost always means a mechanical or electrical change.

Load drifting with the brake applied

If the load drifts down slowly after the control is released, the braking system needs immediate checking. Pad wear, incorrect clearance, oil contamination or failure of the electromagnetic assembly are among the common causes. This is one of the signs that must not be postponed.

Chain or steel rope with visible changes

• Links that are stretched, twisted, showing friction marks or loss of section
• Broken wires, flattening, birdcaging or corrosion in the rope
• Lubrication missing, dried out or contaminated with abrasives
• Irregular winding on the drum or tooth skipping on the load wheel

Hook deformed or with excessive throat opening

The hook is a direct indicator of past overload. Increased throat opening, twisting, cracks, wear at the load bearing point and a jammed safety latch are reasons to take the equipment out of service until it is assessed.

Abnormal heating and protective devices tripping

A motor running hotter than usual, a thermal relay tripping frequently or a circuit breaker acting with no apparent cause point to overload, a ventilation problem, a dragging brake or a winding fault. Lowering the protection setting to "solve" the tripping merely moves the problem elsewhere.

Irregular controls and limit switches

A pendant control with intermittent response, a damaged festoon cable, a limit switch that does not act at the right position and contactors with switching noise are electrical signs that precede downtime. On older equipment these symptoms often accompany panel obsolescence.

Leaks and mechanical play

Lubricant loss in the gearbox, noticeable axial play, misalignment of the travel trolley and wheels with uneven wear all shorten the life of the remaining components. Play tolerated for months usually ends in replacing a whole assembly.

Conclusion

Most hoist failures are preceded by observable signs. Logging incidents, training operators to report them and keeping scheduled inspections turns unplanned downtime into planned maintenance. When any of these signs appears, a technical inspection must come before any continued use.