Troubleshooting
Perform troubleshooting with higher possibility based on the failure phenomenon.
Buzzing
noise
Catching of foreign matter in
the pilot valve
(4)
Decline in the power supply
voltage
(12)
Sealing
failure
Leakage from the port
Catching of foreign matter
(10)
Sealing failure of actuators
(such as cylinder)
(11)
Insufficient supply pressure
(7)
Burnt-out of the coil
Over voltage or incorrect coil
(8)
Exposure to water
(8),(9)
Entrainment of foreign
matter to the pilot valve
Incorrect oil
(5)
Collection of drainage inside
valve
(6)
Failure of the valve
Blown fuse and
/or broken lead wire
(2)
Failure of the pilot
valve or coil
Insufficient contact at
electrical contact/connector
(3)
Broken wire in the coil
(Energizing failure)
(4)
Failure phenomenon
Possible causes
Operation
failure
No switching of the
valve
Incorrect wiring/voltage
(1)
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Refer to next page)
Countermeasures
- 12 -
No.VP3145-OMM0002-B
