10.3
[en] 02/2014
Installation and operating manual - NK 31
Fault Possible cause Remedy See chapter
Control valve does not
close
Pressure switch, or
control valve
Check setting
Oil exits through intake
control valve during
stopr
Sealing surface on intake
control valve damaged,
spring in intake control
valve broken
Check parts and replace
if necessary
System does not
relieve
Solenoid valve/electrical
system
Check
Impulse-pressure relief
valve
Check and replace parts
if necessary
Control valve
constantly discharges
Solenoid valve/electrical
system
Check
Oil escapes during
discharging
(oil foam in ne
separator cartridge)
Oil type incorrect Oil change 7.3
Oil foam forms during
stop
Install discharge delay
valve, replace with
different nozzle diameter
Oil level too high Drain off oil 7.2
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