Fault Phenomenon: JLG 600S telescopic boom aerial work platform during lifting, the chain suddenly breaks, the platform falls.

Troubleshooting Process:
– Checked chain: chain severely worn.
– Checked lubrication: no lubrication.
– Checked load: overload.
– Checked sprocket: sprocket worn.

Root Cause: The chain was overloaded for a long time and lacked lubrication, leading to fatigue breakage.

Required Parts: Lift chain assembly.