USER’S MANUAL
19
The machine should be lower to the lowest position when replace hydraulic oil,
then let the old oil out, and should be filtering the hydraulic oil.
-Each team checks the agility and reliability of pneumatic safety equipment.
Chapter 8 TROUBLESHOOTING
Skilled personnel only are allowed to perform the operations.
Failure and Resolutions
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.
③
The limit switch is not
closed.
Check the limit switch, wires, to 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 for
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.
③
The amount of hydraulic
oil is not enough.
Add hydraulic oil.
When press
“down
handle”, the
machine is
not lowered
①
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.
Use a wood block on the bottom plate to lock
the lift, then remove the “antiknock valve”
from the oil supply hole at the bottom of the
oil cylinder, and clean the ‘antiknock valve’.
Noisy lifting
and lowering.
①
Lubrication
is
not
enough.
Lubricate all hinges and motion parts
(including piston rod) with machine oil
②
The base or the
machine is twisted.
Adjust again the levelness of the machine,
and fill the pad the on base.
Table 2
Chapter 9 Disposal of used oil
Used oil, which is removed from the power unit and the plant during an oil change,
must be treated as a polluting product, in accordance with the legal prescriptions of
the country in which the lift is installed.
Chapter 10 Machine demolition
The machine must be demolished by authorized technicians, just like for assembling.
The metallic parts can be scrapped as iron. In any case, all the materials deriving from
