LINCOS STD-5335A - Chapter 8: Troubleshooting

LINCOS
®
AUTOMOTIVE TOOLS
23
SCISSOR VEHICLE LIFT STD-5335A
CHAPTER 8:
TROUBLESHOOTING
A list of possible troubles and solutions is given below:
TROUBLE: POSSIBLE CAUSE: SOLUTION:
The motor does not run in
lifting operation.
Connection of power supply
wires is not correct.
Check and correct wire
connection
The AC contactor in the
circuit of the motor does not
pick up.
If the motor operates 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 limit switch is not
closed.
Check the limit switch, wires
and adjust or replace the
limit switch.
In lifting operation, the motor
runs, but there is no lifting
movement
The motor turns reverse.
Change 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-ow 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.
The “operation stop valve” is
not closed.
Screw down the “Operation
stop valve”.