Strongway 72642, Owner'S Manual

Page: 15 / 22

Page 15 of 22
Failure Possible Cause Corrective Action
not lower connections. Replace or repair as needed.
Broken conductor in pendant cord
Check the continuity for each conductor in the
cable. If one is broken, replace the entire cable.
Hoist lowers but
will not lift
Hoist overload Reduce load to within rated capacity of hoist.
Worn friction clutch
Repair by a qualified person trained in the repair
of hoist and proper friction clutch adjustment
procedures. Replace as needed.
Broken conductor in pendant cord
Check the continuity for each conductor in the
cable. If one is broken, replace the entire cable.
Faulty switch in pendant
Check electrical continuity. Check electrical
connections. Replace or repair as needed.
Low voltage in hoist
’s power supply
Determine cause of low voltage and bring to
within plus or minus 5% of the voltage specified
on the motor nameplate. The voltage should be
measured at the hoist contractor.
Hoist will not lift
rated load or
does not have
the proper lifting
speed
Hoist overload Reduce load to within rated capacity.
Low voltage in hoist
’s power supply
Determine cause of low voltage and bring to
within plus or minus 5% of the voltage specified
on the motor nameplate. The voltage should be
measured at the hoist contractor.
Faulty friction clutch
If abnormal operation or slippage occurs, do not
attempt to disassemble or adjust the mechanical
load brake with the friction clutch. Replace the
worn or malfunctioning mechanical load brake
with the friction clutch as an assembly with a
new, factory adjusted part.
Load drifts
excessively when
hoist is stopped
Motor demagnetized
Motor demagnetizing is generally caused from
using the hoist beyond its duty rating. Replace
the stator assembly and reduce usage to comply
with the duty rating stated.
Improper gear oil Replace oil with the correct gear oil.
Hoist operates
intermittently
Loose connection in circuit
Check all wires and terminals for bad
connections. Replace as needed.
Collectors making poor contact
Check movement of spring loaded arm, weak
spring, connections, and shoe. Replace as
needed.
Broken conductor in pendant cord
Check for intermittent continuity in each
conductor in the pendant cord. Replace the
entire pendant cord if continuity is not constant.