Excavator Valve
Precision Control (Servo)
(Machines up to serial no. 931159)
Component Key:
A Inlet Port
B Outlet Port
C Centering Spring
D Integral Load Sensing Valves (Isolator Compensator
Spools)
E Bypass Compensator Valve
F Load Sense Drain Regulator and Relief Valve
G Hydra-clamp Solenoid Valve
H Pilot Operated Check Valve
J Load Sense Drain Port
4A Slew Spool
4B Boom Spool
4C Stabiliser Spool
4D Stabiliser Spool
4E Dipper Spool
4F Bucket Spool
4G Aux. Spool (not used on some machine variants)
8 - 13
Section E
Hydraulics
9803/3280
Section E
8 - 13
Issue 2*
Circuit Descriptions
A402510
4F
4E
4D
4C
4B
4A
A
B
C
4G
E
*
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