Trouble
Possible causes
Trouble-shooting
22. Leave the push button
but the hoist does not stop
(1)
The contactor of the direction is
bounded
(2)
The push-button of the direction
is failed
(1)
Replace the contactor of the
direction
(2)
Replace the push-button of the
direction
23. Motor has burnt
(Main hoist, trolley, end-
carriage)
(1)
3 phase sequence are not correct
(a contacting point of a phase is
failed)
(2)
Short-circuit (motor wiring error)
(3)
Over-loading (heavier than its
capacity, and/or overtime)
(4)
Electric breakdown due to
overheating, incurs a short-
circuit between phases (over
duty cycle)
Contact the supplier or the regional
distributor
24. The gear box has
abnormal noise
(1) Bearing trouble
(2) The planetary gear or inner gear
is worn
(3)
The gear-shaft is bent or
deformed
Contact the supplier or the regional
distributor
25. The motor has abnormal
sound
(main hoist, trolley, end-
carriage)
(1)
The bearing is scuffed
Contact the supplier or the regional
distributor
26. Abnormal sound when
the end-carriage is
traversing
(1)
The bearing of trolley wheel is
worn (driving wheels or driven
wheels)
(2)
The front and rear wheel are not
in the same line
(3)
The trolley rail is bent or
deformed
Contact the supplier or the regional
distributor
27. Abnormal sound when
the end-carriage is traveling
(1)
The bearing of end-carriage
wheel is worn (driving wheels or
driven wheels)
(2)
The front and rear wheel are not
in the same line
(3)
Span or girder is deformed,
causing an over-loading
(4)
The specification of rail has not
met its standard. For example
five-ton hoist uses a rail for
three-ton hoist
Contact the supplier or the regional
distributor
28. Oil leaking from gear
box
(1)
Seal is hardened or deformed
(2)
The seal was assembled badly
(3)
The groove of gear box is too
deep
Contact the supplier or the regional
distributor
29. Drum cannot roll
(1)
Driver-seat is loosened
(2)
Connection-shaft was broken
Contact the supplier or the regional
distributor
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