Dato LJCC2040A, User Manual

Page: 13 / 17

user’s manual
13
Chapter 6 Trouble Shooting
Failure phenomenon
Cause and Phenomena Resolutions method
connection of power supply
wires or zero wire is not
correct Check and correct wires connection
the AC contactor in the
circuit of the motor does not
pick up
If the motor works when forcing the
contactor down with an isolation rod, check
the control circuit. If the voltage at two
ends of the contactor coil is normal, replace
the contactor.
The motor doesn’t
run in lifting
operation
UP button failure
Check the contact point of the button and
wires connection and exclude.
The motor turns reverse
Exchange the phases of the power supply
wires
lifting with light load is
normal but no lifting with
heavy load
The set safe pressure of the over-flow valve
may be increased by turning the set knob
right ward slightly. The spool of the
lowering solenoid valve is stuck by dirt.
Clean the spool.
the amount of hydraulic oil
is not enough
Add hydraulic oil
When lifting
operation, the motor
runs but it is no
lifting movement
the descend valve is not
closed fastened
Check the descend valve and exclude.
①
the safety pawl are not
released from the safety
teeth
First lift a little and then lowering When press lower
button, the lift is not
lowering
he solenoid air valve does
not work
Check the solenoid loop circuit and solution
Two carriages are not
synchronized when lift
The force of two steel cable
different or force not enough.
Adjust the cable adjustment nut.
Leak oil Oil pipe fitting loosen Screw down the pipe fitting