Fault Phenomenon: Columbus McKinnon hand chain hoist pulling the hand chain, the lifting chain does not move, internal jam.

Troubleshooting Process:
– Checked ratchet and pawl: pawl spring broken, unable to engage.
– Checked sprocket: sprocket deformed.
– Replaced pawl spring, straightened sprocket.

Root Cause: The pawl spring broke, causing the ratchet mechanism to fail.

Required Parts: Pawl spring, ratchet assembly.