Fault Phenomenon: Dingli aerial work platform after driving, there is oil stain on the wheel hub gearbox housing, oil level drops.

Troubleshooting Process:
– Checked oil seal: oil seal lip aged.
– Checked breather: breather blocked.
– Checked mating surface: gasket damaged.
– Checked oil level: oil level too high.

Root Cause: The input shaft oil seal of the wheel hub gearbox has aged and failed.

Required Parts: Wheel hub gearbox oil seal repair kit.