Hydraulics QUANTUM TIC
11-100 10/04
4.8.2 No working function
LP/LM08
Fault Cause Remedy
No or insufficient pressure
build-up in all consumers
Spool of circulation/pressure relief valve
jams
Pressure pilot control valve does not close
because of
• Foreign object between seat and
ball
• Valve seat pressed out
• O-ring of pressure pilot valve unit
damaged
• Orifice plate in spool of
circulation/pressure relief valve
clogged
• Clean
• Check tie rod tightening
torque (30 Nm)
• Remove and clean
• Replace pressure pilot
valve unit
• Replace O-ring
• Clean
System pressure build-up
• Operating pressure is higher than
preset safety pressure
• 3 way directional control valve
connected as 4 way valve
• Increase pressure setting
• Replace valve
Oil supply to one consumer
is too low or too high
• Incorrect control spool installed • Replace spool
Oil supply to all consumers
too low
• Electric power supply not correct • Check electric controller
Oil supply to valve with the
largest flow range is not
achieved
• Pump oil delivery too low • Check pump and suction
line
One consumer has no
function
• Solenoid is not switching
• Spool of pressure reduction valve
jams
• Control spool works stiffly
• Check electric system
• Check solenoid
• Remove and clean
• Remove and clean
Various valves switch
irregularly
• Control spool works stiffly • Remove and clean
• Check tie rod tightening
torque (30 Nm)
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