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Section D
51 - 1
Servo Pressure Supply Valve
Removal and Replacement
! WARNING
Make the machine safe before working underneath it.
Park the machine on level ground, lower the arms. Apply
the parking brake, put the transmission in neutral and
stop the engine. Chock both sides of all four wheels.
Disconnect the battery, to prevent the engine being
started while you are beneath the machine.
GEN-1-2
!
DANGER
Hydraulic fluid at system pressure can injure you. Before
disconnecting or connecting hydraulic hoses, stop the
engine and operate the controls to release pressure
trapped in the hoses. Make sure the engine cannot be
started while the hoses are open.
INT-3-1-11/1
Removal
1
Park the machine on firm level ground, engage the
parking brake and set the transmission to neutral.
Lower the attachments to the ground and stop the
engine.
Before attempting to remove the valve, vent the pilot circuit
accumulator hydraulic pressure as follows:
2
With the operator seat locked in the rear facing position
and with the arm rests raised forward (for backhoe
operation), switch the starter to ON without starting the
engine. Operate the joystick controls several times to
vent the hydraulic pressure from the servo system and
backhoe rams. Turn the starter switch to the OFF
position and remove the key.
3
Working underneath the rear of the machine as shown,
disconnect the electrical harness connectors A at the
solenoids. Label each connector before disconnecting
to ensure correct replacement.
4
Disconnect all hydraulic hoses from the valve block and
plug the ports to prevent ingress of dirt. Label each
hose before disconnecting to ensure correct
replacement. Plug hose ends to prevent ingress of dirt.
5
Take hold of the valve assembly, loosen and remove the
fixing bolts B securing the valve to the chassis. Lift the
valve assembly from the machine.
9803/3280
Precision Control (Servo)
Purchased from www.WorkshopManuals.co.uk
Controls
Replacement
Replacement is the reverse of the removal sequence.
After replacement check the valve pressure settings. Refer to
Service Procedures - Testing the Servo Pressure.
Note: All hydraulic adaptors that are installed together with a
bonded sealing washer must also have JCB Threadseal
applied to the threads of the adaptor.
Section D
A
B
B
51 - 1
A405610
Issue 1
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