Dato LJS6035, Руководство пользователя

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USER ’ S MANUAL
22
Chapter 8 TROUBLESHOOTING
Skilled personnel only are allowed to perform the operations.
Failure and Troubleshooting.
Failure Cause Troubleshooting
The motor
does not run
in lifting
operation.
①
Connection of power supply
wires is not correct.
Check and correct wire connection
② 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
① The motor turns reverse. Change the phases of the power supply wires.
② Lifting with light load is
normal but no lifting with heavy
load.
The set safe pressure of the overflow valve may be
increased by turning the set knob right ward slightly.
The spool of the descent valve is stuck by dirt. Clean the
spool.
③ The amount of hydraulic oil is
not enough.
Add hydraulic oil.
When press
“ DOWN ”
button, the
machine
does
not
lowered
① The safety pawl are not released
form the safety teeth.
First lift a little and then lowering
②
The safety pawl is not lifted.
The air pressure is not enough, the safety pawl is
stuck or the air pipe is broken off, adjust
pressure, check the air pipe and replace it.
③ The solenoid air valve does
not work.
If the solenoid air valve is energized, but does
not open the air loop, check or replace the
solenoid air valve.
④
The descent valve is energized
but does not work.
Check the plug and coil of descent valve and
check the right turn tightness of its end copper
nut and so on.
⑤ The “antiknock valve” is
blocked.
Remove the “antiknock valve” from the oil
supply hole at the bottom of the oil cylinder, and
clean the “antiknock valve”.
The machine
lowers
extremely
slowly under
normal loads
①
The hydraulic oil has too high
viscosity or frozen, deteriorated
(in Winter).
Replace with hydraulic oil in accordance with the
instruction book.
② The “antiknock valve” for
preventing oil pipe burst is
blocked.
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”.
The right and
left platforms
are not
synchronous
and not in the
① The air in the oil cylinder is
not vent completely.
Refer to “Oil make-up adjustment ”.
②
Oil leakage on oil pipe or at its
connections.
Tighten oil pipe fitting or replace oil seals and then
make-up oil and adjust levelness.