Fault Phenomenon: General manual pallet truck while pushing, a wheel suddenly falls off, vehicle tilts.

Troubleshooting Process:
– Checked axle material: material brittle.
– Checked load: overload.
– Checked fatigue: fatigue fracture.
– Checked impact: impact damage.

Root Cause: The wheel axle fractured due to long-term overload and fatigue.

Required Parts: Wheel axle and wheel assembly.