TIC QUANTUM Hydraulics
10/04 11-101
4.8.3 No working function
with multiple
actuation
Fault Cause Remedy
Function only at consumer with
lowest pressure demand
• Pump oil delivery too low
• Non-return valve in load
signalling line leaking as it
does not close its ball or its
ball is missing
• Replace or clean pump
Install ball if missing
Insufficient function at one
consumer
• Ram of directional control
valve works stiffly
• Remove and clean
4.8.4 Consumers lower
Fault Cause Remedy
Internal leak at the directional
control valve too high
• Control spool or valve body
worn
• Replace directional
control valve
4.8.5 Oil heating-up
Fault Cause Remedy
System pressure build-up in neutral
position
• Incorrect valve mounting
plate, no control oil return
Z - T
• Replace plate
Circulation pressure too high
• Directional control valve
does not return fully to the
neutral position as
connecting screws are
tightened too much (30 Nm)
• Reduce tightening torque
4.8.6 External oil leaks
Fault Cause Remedy
Oil leak between plates
• Sealing plate damaged • Replace
• Foreign object between O-
ring and seal surface
• Clean
• Seal surface damaged,
possibly due to a blow on
the edge
• Dress surface
Oil leak at solenoid
• Sealing damaged • Replace
Oil leak at pressure pilot valve unit
• Sealing nut not locked or
cutting edge of drain plug
damaged
• Tighten or replace
• Sealing nut damaged • Replace
Oil leak at screw plug
• Screw plug loose
• Copper seal damaged
• Tighten
• Replace
To Next Page
