Fault Phenomenon: Skyjack SJ4626 scissor lift aerial work platform a crack is found on the chassis beam.

Troubleshooting Process:
– Checked weld: weld cracked.
– Checked load: prolonged overload.
– Checked road conditions: severe road bumps.
– Checked fatigue: metal fatigue.

Root Cause: The chassis cracked due to metal fatigue from long-term operation on rough roads.

Required Parts: Chassis welding repair or reinforcement plate.