Harrington-hoists-and-cranes AHM Hoist User Manual download pdf (Page 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.

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Harrington-hoists-and-cranes AHM Hoist User Manual Page 43

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