- 10 -
VG300
∗∗
-OMH0002-B
TROUBLE SHOOTING
Should any trouble be found during operation, trace the source of the trouble in the following or der and take correcitve action.
Worn pilot valve packing
Foreign matter caughtin seat
Foreign matter caughtin core
Air leaks through EXH. Port of
pilot valve
(14)
(6),(16)
(7)
Faulty operation
Pilot valve is not operated.
Insufficient bolt tightening
Air leaks throuth gasket.
Low line voltage
Measures
Spool valve has not completely shifted.
(1)
(2)
(3)
(4)
(5)
Leakage
Worn spool packing
Air leaks through EXH. port
[3(R) port] of main valve.
Poor seal on actuator (cylinder, etc.) side
In case of N.O., EXH port is
1(P) port.
Intrusion of foreign matter
Coil splashed by water
Trouble phenomenon
Broken coil wire
Foreign matter caughtin armature
Changeover plate is not placed properly.
Low pilot pressure
Faulty wiring
Blown fuse of disconnection lead wire
Poor contact at contactor wire or connection part
Cause expected
Though pilot valve does shift,
main valve will not shift or
wilbe sluggish.
Intrusion of foreign matter
Internal and external pilot setting is wrong.
Higher voltage or wrong coil used
Burnt coil
Swollen spool packing
Excessive supply oil amount
Worn coil
Low line voltage
Buzzing
Abing continuous buzzing
sound is emitted when the
power is turned on.
(8)
(11)
(14),(15),(17)
(9)
(10)
(18)
(11)
(6),(7)
(5)
(1)
(12)
(13)
Remedy
