Fault Phenomenon: Big Joe electric stacker during lifting, a loud noise suddenly occurs, the mast drops rapidly, and the chain breaks.

Troubleshooting Process:
– Checked chain wear: chain severely stretched.
– Checked sprocket: sprocket worn.
– Checked lubrication: long-term dry running without lubrication.
– Checked load: overloaded operation.

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

Required Parts: Lift chain assembly and sprocket.