Fault Phenomenon: BelAZ 7530 mining truck large oil stains on the wheel hub gearbox housing, oil drips on the ground.

Troubleshooting Process:
– Checked oil seal: wheel hub floating oil seal aged and failed.
– Checked breather cap: breather clogged, high internal pressure.
– Checked oil level: gear oil overfilled.
– Checked housing: mating surface gasket damaged.

Root Cause: The wheel hub gearbox breather cap is clogged with mud; internal pressure rises during operation due to heat, blowing out the floating oil seal.

Required Parts: Replace wheel hub floating oil seal and clean breather cap.