TIC QUANTUM Hydraulics
10/04 11-99
4.8 Faults and
remedies
4.8.1 Control system
(LP/LM08 with
SV02)
a
b
System screw turned in
System screw turned out
c Control spool jams
d Nozzle plugged
e Pressure valve will not close
f Insufficient electric power supply
g Pressure reducer works stiffly
h Control spool works stiffly
i Electric contact is not interrupted
k Solenoid will not switch
l Seated valve will not close
m Hydraulic motor defective
n Sealing plate, sealing nut or O-ring defective
o Block twisted, tie rods tightened too much
Circulation valve with
pressure relief valve
Directional control
valve
Seated
valve
a b c d e f g h i k l m n o
With open hydraulic system:
Tractor system pressure or
170 bar pressure build-up
with deactivated control units
1
With oil supply from “John
Deere tractors”: Steering
“wanders”
2
Hydraulic motor – does not
run
4 3 8
Hydraulic motor – runs only
in one direction
3
Hydraulic motor – does not
stop
3 6
Hydraulic motor – does not
reach max. speed
5
Cylinder – no function 4
Cylinder – does not remain
pressure-tight
7
No function from any
cylinder
4 3
No function from cylinders or
motor
3 3
Oil heating up 1
External leaks 8 9
Eliminating the faults 1 Back off screw
2 Turn in screw
3 Remove and clean
4 Check electric system, operate emergency shut-off
5 Insufficient electric power supply or pump capacity too low
6 Electric contact not interrupted, remove plug
7 Replace valve block
8 Replace
9 Check tie rod tightening torque (30 Nm)
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