Fault Phenomenon: Liebherr port crane when using a grab, the open/close rope suddenly breaks, the grab falls.

Troubleshooting Process:
– Checked break: fracture shows fatigue characteristics.
– Checked sheaves: sheave groove base diameter worn beyond limit.
– Checked lubrication: wire rope dry.
– Replaced full set of wire rope and worn sheaves.

Root Cause: Worn sheave grooves caused wire rope extrusion and deformation, accelerating fatigue breakage.

Required Parts: Wire rope, sheave set.