Fault Phenomenon: Manitou 100VJR vertical mast aerial work platform during lifting, the chain breaks, the platform falls.

Troubleshooting Process:
– Checked chain wear: severely worn.
– Checked lubrication: lack of lubrication.
– Checked load: overload.
– Checked sprocket: sprocket worn.

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

Required Parts: Lift chain assembly.