Fault Phenomenon: XCMG portal crane when using a grab, the ropes on both sides open/close at different times, causing material spillage.

Troubleshooting Process:
– Checked wire rope lengths: inconsistent lengths between sides.
– Checked sheave blocks: one side’s sheave seized.
– Adjusted wire rope lengths, replaced seized sheave.

Root Cause: Inconsistent wire rope elongation or significant difference in sheave block resistance.

Required Parts: Wire rope, sheave.