7 - 20
HYDRAULIC PRESSURE SETTINGS
CASE TRAINING CENTER
AUGUST 2000
Not possible to select 2nd travel speed
No. Tests Results Repairs
1
Press the travel speed control and
check that the speed changes from I
to II on the console screen
Speed II is not displayed
Refer to troubleshooting electrical
failures
2
Check on diagnostic screen "CHK2"
if the information changes to "ON"
when the machine is travelling
Information stays on "OFF"
Check pressures P1 and P2 on
diagnostic screen "CHK1" when the
machine is travelling
1) both pressures are less than
40 bar: refer to troubleshooting
electrical failures
2) both pressures are higher than
40 bar, refer to point No. 3
3
Check the pump regulating pressure
(N)
Too high Adjust the pressure
4
Check the pilot pressure at the
output from solenoid valve (C1)
Pressure too low
Check the electrical supply and the
solenoid valve coil (No. 5 and 6)
Pressure correct (39 bar - 3.9 MPa)
Check the pilot pressure at the travel
motor displacement change spool
(No. 7)
5
Check the voltage at the electrical
plug on the displacement change
solenoid valve
Voltage < 24 V Check the electrical harness
6
Check the displacement change
solenoid valve coil
Infinite or 0 Ohm Change the solenoid valve
About 40 Ohm Change the solenoid valve coil
7
Check the pilot pressure at the travel
motor displacement change spool
Pressure too low
Internal leak at hydraulic swivel,
repair or change the hydraulic swivel
Pressure correct (39 bar - 3.9 MPa)
Check the travel motor displacement
change spool.
Repair or change the travel motor
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