Fault Phenomenon: ZPMC gantry crane during travel, the wheel flange rubs severely against the rail side, generating sparks.

Troubleshooting Process:
– Checked rail span: span deviation exceeded tolerance.
– Checked frame diagonals: frame deformed.
– Checked drive motor synchronization: inconsistent speeds.
– Adjusted rail span, repaired frame or adjusted motor parameters.

Root Cause: Rail span deviation or frame deformation caused the wheel centerline to be non-perpendicular to the rail.

Required Parts: None (requires mechanical adjustment).