55
EN
M1.1.HB250CF.NLFREN - 05012018
10 Trouble shooting
Skilled personnel only is allowed to perform the operations�
Failure phenomena
Cause and phenomena
Resolutions
The motor does not run in lifting
operation.
Power supply is abnormal
Check and correct wire connection
There is a short circuit in the AC contactor
Check the wire of AC contactor
The limit switch is broken
Check the limit switch, wires and adjust or
replace the limit switch
The motor has noise but can
not run
Motor phase loss
Stop run the motor and check the wire
In lifting operation, the motor
runs, but there is no lifting
movement
The motor turns reverse
Change the phases of the power supply
wires
The amount of hydraulic oil is not enough
Add hydraulic oil
There is some air in the pump due to the
transport, causing the air block-up
Dismount the one-way valve and raise the
lift a little (pay attention to the oil). Mount
the one-way valve if the oil outflows from
the hole
Throttle valve is out of order
Check the valve element and seal rings of
throttle valve, clean the valve element and
replace the seal rings
Some block in the valve element of oil
returns solenoid valve
Clean the valve element
Seal rings in the oil pump outlet are
damaged
Demount the gear pump and replace the
seal rings
Motor runs heavily. Out net of oil filter blocks
seriously
Clean the oil filter
The lift raises slowly
Seal rings in the oil pump outlet are
damaged
Demount the gear pump and replace the
seal rings
The lift trembles in the lifting
operation
There is some air in the hydraulic oil circuit
Raise the lift up and down to exhaust the air
Air leakage on the upper connector of
absorbing oil hose
Check the absorbing oil hose of oil pump
The oil filter blocks
Clean the oil filter
The lift can be raised but can
not fall
The button is out of order
Replace the button
The safety claw is not separated from the
safety plate
Check the electromagnet, replace it if
damaged. If not, adjust the safety to make
it normal
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