Harrington Hoists and Cranes TCR Hoist - (1/4-6 Ton) - Manual (Page 45)

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Table 8-1 Troubleshooting Guide
Symptom Cause Remedy
Unable to lift rated load
Lack of air pressure or loss of air
supply.
Repair or adjust air supply or filters.
Improper adjustment of load limiter. Adjust Load Limiter. See Section 7.1 .
Air leak between the two chambers
in the Top Cover
Correct or repair to eliminate air leak.
Hoist moving in wrong
direction (pendant control) Pendant control tubes are terminated
to incorrect ports on hoist body. Connect the control tubes in
accordance with
Section 7.4 .
Hoist lowers but will not lift
Hoist is overloaded. Reduce load to hoist rated capacity.
Faulty pendant control or control
tube(s) Repair or replace pendant control or
control tube(s)
Lack of air pressure or partial loss of
or leakage in air supply.
Repair or adjust air supply or filters.
Hoist continues running after
pendant or cord is released
Main Spool sticking
Inject approx. 20 drops of oil into inlet
port to lubricate the main spool. If
spool still sticks, repair at service
facility.
Main Spool spring broken Repair at service facility
Main Spool leaking Repair at service facility
Mis-alignment of Limit Shaft with
Bottom Plate (TCR3000/6000 only) Loosen Bottom Plate and re-align so
that Limit Shaft operates freely.
Valve in Pendant Handle stuck Repair at service facility
Hoist drifts excessively when
hoist is stopped
Brake is not holding. Repair brake at service facility.
Motor vanes leaking.
Replace motor vanes and springs at
service facility.