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-Use box truck in the process of transport, use container storage when
shipping.
-The control box should be placed perpendicularly during the transport;
and prevent other goods from extrusion.
The motor does not run in
lifting operation.
In lifting operation, the motor
runs, but there is no lifting
movement.
When press
"Lower" button, the machine is
not lowered.
The
machine
lowers
extremely
slowly
under
normal loads.
The right and left platforms
are not synchronous and not
in the same height.
Noisy lifting and lowering.
ATTENTION! Before performing inspections or repairs, make sure that the lift has been disconnected from the mains
supply using the main switch located on the control box. This switch must be locked in the off position using a padlock.
004152 – 04/2021
TROUBLESHOOTING
Cause and Phenomena
① Connection of power supply wires
or zero wire is not correct.
② The AC contactor in the circuit of
the motor does not pick up.
③ The limit switch is not closed.
① The motor turns reverse.
② Lifting with light load is normal but
no lifting with heavy load.
③ The amount of hydraulic oil is not
enough.
④ The "operation stop valve" is not
open.
① The safety pawl are not released
form the safety teeth.
② The safety pawl is not lifted.
③ The solenoid air valve does not
work.
④ The lowering solenoid valve is
energized but does not work.
⑤ The hydraulic oil has too high
viscosity or frozen, deteriorated
(in Winter).
The "antiknock valve" for preventing
oil pipe burst is blocked.
① The air in the oil cylinder is not
vent completely.
② Oil leakage on oil pipe or at its
connections.
③ The "oil make-up stop valve" can
not be closed tightly and almost
make-up oil and adjust every day.
① Lubrication is not enough.
② The base or the machine is
twisted.
-The temperature for machine storage: -5ºC to 55ºC
Check and correct wire connection.
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.
Short-circuit which are connected with the limit switch, and
if the trouble disappears, check the limit switch, wires and
adjust or replace the limit switch.
Change the phases of the power supply wires.
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.
Add hydraulic oil.
Turn right and open the "Operation stop valve and supply
hydraulic oil to main oil cylinder.
First lift a little and then lowering.
The air pressure is not enough or the safety pawl is stuck.
If the solenoid air valve is energized, but does not open the
air loop, check or replace the solenoid air valve.
Check the plug and coil of the lowering solenoid valve and
check the right turn tightness of its end copper nut and so
on.
Replace with 20# hydraulic oil in accordance with the
instruction book.
Remove or close air supply pipe and thus lock the safety
pawl of the machine without lifting of the safety pawl.
Remove the "antiknock valve" from the oil supply hole at
the bottom of the oil cylinder, and clean the "antiknock
valve".
Refer to "Ⅶ. Oil Make-up 'Adjust' Operation".
Tighten oil pipe connections or replace oil seals and then
make-up oil and adjust levelness.
Replace oil make-up stop valve, and then make-up oil and
adjust.
Lubricate all hinges and motion parts (including piston rod)
with machine oil.
Adjust again the levelness of the machine, and fill or pad
the base.
Resolutions
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