Case CX130 - Page 259

HYDRAULIC PRESSURE SETTINGS
7 - 23
CASE TRAINING CENTER
AUGUST 2000
Not possible to select hard/soft shock absorbing system
The boom or the dipper does not lower
(No problems with other movements)
No. Tests Results Repairs
1
Check on diagnostic screen "CHK3"
if information displayed changes to
"ON" when hard/soft shock
absorption is selected/deselected
Information stays on "OFF"
Check the signal at the electronic box
input:
Below 5 volts: change the control box
5 volts: change the electronic box
2
Check the pilot pressure at the hard/
soft shock absorption solenoid valve
(C4)
Pressure too low
Check the electrical supply and the
solenoid valve coil (Nos. 3 and 4)
Pressure correct (39 bar - 3.9 MPa)
Repair or change the hard/soft shock
absorption valve
3
Check the voltage at the electrical
plug on the hard/soft shock
absorption solenoid valve
Voltage < 24 V Check the electrical harness
4
Check the hard/soft shock absorption
solenoid valve coil
Infinite or 0 Ohm Change the solenoid valve
About 40 Ohm Change the solenoid valve coil
No. Tests Results Repairs
1
Manually check the movement of the
pilot spool
Difficult to move Spool stuck or spring broken
2 Check the load holding operation Sticking
Repair or change the load holding
valve
3
Check the pilot pressure at the
control valve spool
Pressure below 30 bar
Check the operation of the control
lever spool, change or repair