40 - 2
Pilot Control Valves
Removal and Replacement
Note that the procedure shows the right hand control valve.
The removal and replacement procedure for the left hand
valve is identical.
Before attempting to remove a pilot control valve the pilot
circuit accumulator pressure must be vented.
1 Stop the engine. With the operator seat set in the rear
facing position (for backhoe operation), switch the
starter to ON without starting the engine. Operate the
joystick controls several times to vent the servo
pressure from the accumulator. Switch the starter
switch to the OFF position.
Removal
1 Reach inside the arm assembly and undo the two arm
rest fixing bolts 1. Carefully lift the rear of the arm rest 2
and pull it to the rear to release.
2 Undo the retaining screws and remove the plastic
covers 3 and 4. Undo and remove bolt 5 together with
lock washer 10. Lift the link rod 6 to one side.
3 Note the phasing of the hoses connected at the valve 7.
If the hoses are not already tagged, tie on your own
tags. Make sure you have recorded the connections
correctly, enabling correct re-connection when
replacing the valve. Disconnect the hoses at the valve.
Cap all open hoses and ports.
4 Undo the three fixing bolts 8 and lift out the valve.
Replacement
Replacement is the reverse of removal. Make sure that the
joystick gaiter 9 is correctly located.
Section D Controls
9803/3280
Section D
40 - 2
Issue 1
Precision Control (Servo)
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