Harrington Hoists and Cranes MCR Trolley - Manual (Page 38)

38
7.0 Troubleshooting
WARNING
HAZARDOUS AIR PRESSURE IS PRESENT IN THE HOIST, IN THE SUPPLY OF
COMPRESSED AIR TO THE HOIST, AND IN THE 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 7-1 Troubleshooting Guide
Symptom Cause Remedy
Loss of power Check air tubes, hoses and air supply.
Wrong air volume or
pressure Check air volume and pressure against the rating on the
nameplate of the trolley.
Trolley will not operate
Improper, loose, or
broken tubing or hoses
in trolley air supply
system Shut off air supply, check tubing and hose connections at the
hoist, trolley and push-button pendant.
Trolley drifts
excessively when
stopping Motor brake not
holding Clean and inspect brake. Replace if necessary. (see Section 6.3
for Brake Inspection)
Trolley Operates
Intermittently See Trolley will not
operate
Low air pressure at
hoist inlet port.
Repair or adjust air supply or filters. Check for airline obstruction.
Air supply hose or
piping is too small. Replace hose or piping sizes with recommended sizes in Section
3.10 .
Malfunction of brake. Repair at service facility.
Bending or crimping of
pendant hoses or
control tubes
Correct or repair the bend or crimp in hose and/or control tubes
Lack of sufficient oil in
air supply to trolley Increase oil in air supply to trolley in accordance with
requirements in
Section 6.1 .
Exhaust Silencer
clogged
Clean or replace.
Air flow capacity of
compressed air
system insufficient
Increase airflow capacity of compressed air system to
requirements in
Section 2.0 .
Air motor vanes or
bearings worn
Repair at service facility.
Traveling speed is
slow
Air supply to hoist
contains dirt or debris Filter the air supply to the trolley in accordance with the
requirements in
Section 3.8 .