Harrington Hoists and Cranes ED-DA Hoist - (ED3) - Manual (Page 37)

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Table 7-1 Troubleshooting Guide
Symptom Cause Remedy
Hoist operates
intermittently
Collectors making poor
contact Check movement of spring loaded arm, weak spring, connections,
and shoe. Replace as needed.
Contactor contacts
arcing
Check for burned contacts. Replace as needed.
Loose connection in
circuit Check all wires and terminals for bad connections. Replace as
needed.
Broken conductor in
Pendant Cord Check for intermittent continuity in each conductor the Pendant
Cord. Replace entire Pendant Cord if continuity is not constant.
DA Model - Hook
drops out of cylinder
chuck
Worn or deformed Ball
Guide Tube Check Ball Guide Tube for excessive wear or deformation.
Replace as needed.
Actuation of Limit
Switch does not stop
hoist
Limit switch defective Repair or replace as required.
Bent or worn lever;
Lever should move
freely.
Repair or replace as required.