Harrington Hoists and Cranes AHM Hoist - Manual (Page 43)

43
8.0 Troubleshooting
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HAZARDOUS AIR PRESSURE IS PRESENT IN THE HOIST, IN THE SUPPLY OF COMPRESSED AIR TO
THE HOIST, AND IN CONNECTIONS BETWEEN COMPONENTS.
Before performing ANY maintenance on the equipment, de-energize the supply of compressed air to the
equipment, and lock and tag the supply device in the de-energized position. Refer to ANSI Z244.1, “Personnel
Protection - Lockout/Tagout of Energy Sources.”
Only Trained and competent personnel should inspect and repair this equipment.
Table 8-1 Troubleshooting Guide
Symptom Cause Remedy
Does not operate
Lack of air pressure or loss of air
supply.
Repair or adjust air supply or filters.
Seizure of Main Spool, brake
Shuttle, or Air Motor.
Repair at service facility.
Seizure of brake or brake
mechanism fails to release.
Repair at service facility.
Hoist is overloaded.
Reduce the load to the rated capacity
of hoist.
Lifting speed is slow
Low air pressure at hoist inlet port.
Repair or adjust air supply or filters.
Check for air line obstruction.
Air supply hose or piping is too small.
Replace hose or piping sizes with
recommended sizes in Section 3.0.
Malfunction of brake. Repair at service facility.
Lack of sufficient oil in air supply to
hoist
Increase oil in air supply to hoist in
accordance with requirements in
Section 3.0.
Exhaust Silencer S or Silencer F
clogged
Clean or replace.
Air flow capacity of compressed air
system insufficient
Increase air flow capacity of
compressed air system to
requirements in Section 2.0.
Air motor Vanes or bearings worn Repair at service facility.
Air supply to hoist contains dirt or
debris
Filter the air supply to the hoist in
accordance with the requirements in
Section 3.0.
Unable to lift rated load
Lack of air pressure or loss of air
supply.
Repair or adjust air supply or filters.
Hoist lowers but will not lift
Hoist is overloaded. Reduce load to hoist rated capacity.
Lack of air pressure or partial loss of
or leakage in air supply.
Repair or adjust air supply or filters.