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Hydraulic Circuit Schematic
Precision Control (Servo)
(Machines up to serial no. 931159)
Component Key:
1 Tank
1A Breather
1B Fill Screen
1C Suction Strainer
2 Pump, Main Section
2A Pump, Secondary Section
3 Loader Valve Block
3A Extending Dipper Spool
3B Loader Lift Ram Spool
3C Loader Shovel Ram Spool
3D Clamshovel Spool
3E Extending Dipper Ram Rod Side A.R.V.
3F Extending Dipper Ram Head Side A.R.V.
3G Shovel Ram Head Side A.R.V.
3H Shovel Ram Rod Side A.R.V.
3L Unloader Valve Spool
3M Main Relief Valve (MRV)
3N Unloader Check Valve
3P Unloader Pilot Valve
3Q Hydraulic Speed Control Solenoid
4 Excavator Valve Block
4A Slew Spool
4B Boom Spool
4C Right Stabiliser Spool
4D Left Stabiliser Spool
4E Dipper Spool
4F Bucket Spool
4G Auxiliary Spool
4H Hydraclamp Valve (Sideshift Only)
4J Slew A.R.V.
4K Slew A.R.V.
4L Dipper Ram Head Side A.R.V.
4M DipperRam Rod Side A.R.V.
4N Boom Ram Rod Side A.R.V.
4P Boom Ram Head Side A.R.V.
4Q Bucket Rod Side ARV (Hammer Only)
4R Bucket Ram Head Side A.R.V.
4S Bypass Compensator Valve
4T Load Sense Drain Regulator and Relief Valve
4U Pilot Operated Check Valve (Hydraclamp)
5 Anti Cavitation Check Valve
6 Hydraulic Oil Cooler
7 Steer Unit
8 Priority Valve
9 2WS Power Track Rod Ram
10 Extending Dipper Ram
11 Lift Ram L.H.
12 Lift Ram R.H.
13 Shovel Ram L.H.
14 Shovel Ram R.H.
15 Clam Shovel Ram L.H.
16 Clam Shovel Ram R.H.
17 Bucket Ram
18 Dipper Ram
19 Stabiliser Ram
20 Stabiliser Ram
21 Boom Ram
22 Slew Ram L.H.
23 Slew Ram R.H.
24 Hydraclamps (Sideshift Only)
Section E Hydraulics
9803/3280
Section E
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Issue 2*
Basic System Operation
*
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