30 - 1
Section E Hydraulics
9803/8550
Section E
30 - 1
Schematic Hydraulic Circuit
Issue 4*
C Cooler
F1 Filter
P1 Main Pump
P2 Main Pump
P3 Auxiliary Gear Pump
M1 Left Hand Drive Motor
M2 Right Hand Drive Motor
S1 Suction Strainer
T Tank
1 Loader Joystick
2 Loader Valve Block
2A Crowd Spool
2B Lift Spool
2C Auxiliary Spool
2D Main Relief Valve (MRV)
2E Crowd Ram Rod Side ARV
2F Crowd Ram Head Side ARV
2G Lift Ram Head Side ARV
2H Auxiliary ARV
2J Auxiliary ARV
2X Pressure Test Point (Main Relief Valve)
2Y Pressure Test Point (Transmission Charge Pressure)
2Z Pressure Test Point (Brake Pressure) &
Hand Pump Connector (Manual Brake Release)
3 Check Valve (5 bar)
4 Excavator Valve Block
4A Slew Spool
4B Boom Spool
4C Stabiliser Spool
4D Stabiliser Spool
4E Dipper Spool
4F Bucket Spool
4G Auxiliary Spool
4H Hydraclamp Valve
4J Slew ARV
4K Slew ARV
4L Boom Ram Head Side ARV
4M Boom Ram Rod Side ARV
4N Dipper Ram Rod Side ARV
4P Dipper Ram Head Side ARV
4Q Bucket Ram Rod Side ARV
4R Bucket Ram Head Side ARV
4S Auxiliary ARV
4T Auxiliary ARV
5 Crowd Rams
6 Manually Operated Dump Valve
7 Lift Rams
8 Drive Control Joystick
8A Reverse Spool
8B Left Turn Spool
8C Forward Spool
8D Right Turn Spool
9 Pressure Reducing Solenoid Valve
11 Filter By-pass Valve (3 bar)
12 Auxiliary Feeds
30 Hydraclamp
32 Stabiliser Ram
33 Stabiliser Ram
34 Slew Ram
35 Slew Ram
36 Boom Ram
37 Dipper Ram
38 Bucket Ram
50 Bi-restrictor
51 Bi-restrictor
Note: Excavator services shown here are to the JCB 'X'
control pattern. For ISO '+' control pattern, components 36
and 37 are swapped over.
Run in Tandem
*
Component Key - Standard Machine up to machine no. 751011
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