Fault Phenomenon: BelAZ 7530 electric wheel mining truck a loud impact sound comes from the wheel while driving, followed by the wheel locking up.

Troubleshooting Process:
– Checked gears: planetary gear or sun gear in the reduction gearbox broken.
– Checked lubrication: insufficient gear oil or containing large amounts of metal debris.
– Checked bearings: support bearing cage collapsed, causing gear misalignment.
– Checked foreign objects: metal debris caught between teeth.

Root Cause: The electric wheel reduction gear broke a tooth due to long-term overload or poor lubrication, causing tooth surface fatigue spalling and eventual breakage, with debris jamming the gear.

Required Parts: Replace electric wheel reduction gear set and bearings, thoroughly clean the wheel hub.