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Section E Hydraulics
9803/3280
Section E
3 - 34
Issue 1
Basic System Operation
Hydraulic Circuit Schematic
Precision Control (Servo)
(Machines from January 2003)
The schematic shows the main system hydraulics for
Precision Control (Servo) machines. For the pilot circuit refer
to relevant pages.
Note: The boom and dipper services are interchanged for
the ISO control pattern.
Component Key:
Small letters on the schematic indicate port markings. Refer
to Technical Data pages at the begining of this section for
more information. Ports A and B are always identified as
service ports (feed and return from respective ram).
1 Tank
1B Return Filter
1C Suction Strainer
2 Pump, Main Section
2A Pump, Secondary Section
3 Loader Valve Block
3A Loader Lift Ram Spool
3B Loader Shovel Ram Spool
3C Clam Shovel Spool
3D Shovel Ram Head Side A.R.V.
3E Shovel Ram Rod Side A.R.V.
4 Excavator Valve Block
4A Slew Spool
4B Boom Spool (Dipper ISO)
4C Right Stabiliser Spool
4D Left Stabiliser Spool
4E Dipper Spool (Boom ISO)
4F Bucket Spool
4G Extending Dipper Spool
4H Hydraclamp Valve (Sideshift Only)
4J Slew A.R.V.
4K Slew A.R.V.
4L Boom Ram Rod Side A.R.V.
4M Boom Ram Head Side A.R.V.
4N Dipper Ram Head Side A.R.V.
4P Boom Ram Rod Side A.R.V.
4Q Bucket Ram Head Side A.R.V. (Hammer Only)
4R Bucket Ram Rod Side A.R.V.
4S Extending Dipper Ram Rod Side A.R.V.
4T Extending Dipper Ram Head Side A.R.V.
4U Flow Regulator Valve
4V Flushing Valve
4W Load Sense Relief Valve
5 Hydraulic Oil Cooler
6 Anti Cavitation Check Valve
7 Lift Ram R.H.
8 Lift Ram L.H.
9 Shovel Ram R.H.
10 Shovel Ram L.H.
11 Clam Shovel Ram R.H.
12 Clam Shovel Ram L.H.
13 Steer Mode Control Valve
14 Steer Unit
15 AWS Power Track Rod Rams
16 2WS Power Track Rod Ram
17 Unloader Valve
18 Priority Valve
19 Stabiliser Ram R.H.
20 Stabiliser Ram L.H.
21 Hydraclamps (Sideshift Only)
22 Boom Ram (Dipper ISO)
23 Slew Ram R.H.
24 Slew Ram L.H.
25 Dipper Ram (Boom ISO)
26 Bucket Ram
27 Extending Dipper Ram
Hammer Option:
40 Hammer Flow Valve
41 Hammer Selector Valve
42 Hammer Feed Coupling QR
43 Hammer Return Coupling QR
Power Sideshift Option:
44 Power Sideshift Selector Valve
45 Power Sideshift Ram
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