14
9 Trouble shooting guide
WARNING
●
To prevent injuries, any repair work or trouble-shooting must be done by qualified personel
familiar with this kind of equipment. Use the proper gauges and device.
Problems
Possible Causes
Remedies
Motor does not run
WARNING
Disconnect power
supply before
disassembly or repair.
(1)
No supply voltage.
(2)
Broken lead wire or defective
power cord plug.
(3)
Defective switches.
(4)
Worn carbon brushes.
(5)
Defective motor.
(6)
Defective remote switch.
(7)
Unit is not plugged in.
(1)
Check line voltage.
(2)
Replace defective partd.
(3)
Check switches.
(4)
Replace carbon brushes.
(5)
Repair or replace motor.
(6)
Repair or replace switch.
(7)
Plug in unit.
Abnormal
noise
of
motor.
(1)
Damage or pump or motor.
(2)
Damage of ball bearings, etc.
(1)
Repair or replace unit.
(2)
Replace ball bearings.
Motor
runs,
but
cylinders
do
not
advance or retract.
(1)
Damage of release valve.
(2)
Oil level is too low.
(3)
Air in system.
(4)
Filter plugged or dirt in pump.
(5)
Damage of pump body.
(6)
Damage or out of adjustment
of relief valve.
(1)
Repair or replace it.
(2)
Fill reservoir to 1/2 of level
gauge with all cylinders
retracted.
(3)
Bleed the system.
(4)
Pump
filter
should
be
cleaned and if necessary,
pump should be dismantled
and cleaned.
(5)
Repair pump.
(6)
Repair or readjust as needed.
Cylinders works, but
full pressure is not
built up.
(1)
Damage of release valve.
(2)
Air in system.
(3)
Damage of pump body.
(4)
Lowering of set pressure or
damage of relief valve.
(1)
Repair or replace.
(2)
Bleed the system.
(3)
Repair pump.
(4)
Readjustment of set pressure
or repair of relief valve.
Cylinders works, but
their speed too slow,
partially or erratically.
(1)
Damage of release valve.
(2)
Air in system.
(3)
Unacceptable rise in oil
temperature.
(4)
Damage of pump body.
(1)
Repair or replace.
(2)
Bleed the system.
(3)
Stop operation or install oil
cooler. (max. 55
℃
)
(4)
Repair pump.
Cylinders
do
not
retract.
(1)
Damage of release valve.
(2)
Damage of return springs of
cylinders or quick couplers.
(1)
Repair or replace.
(2)
Repair or replace springs or
couplers.
Oil leaks.
Damage seals, seats or steel
balls.
Replace them.
Short circuit.
(1)
Damage cords.
(2)
Bad insulation of electric
parts.
(1)
Replace.
(2)
Replace.