33 - 4
Section E Hydraulics
9803/8550
Section E
33 - 4
Issue 3*
C Cooler
F1 Filter
F2 High-flow Filter
P1 Main Pump
P2 Main Pump
P3 Auxiliary Gear Pump
M1 Left Hand Drive Motor
M2 Right Hand Drive Motor
S1 Suction Strainer
S2 High-flow Pump Suction Strainer
T Tank
1 Left Hand 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
2W Pressure Test Point (High-flow Relief Valve)
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 (8 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 Right Hand Joystick
9 Brake Valve
10 Check Valve (2 bar)
11 Filter By-pass Valve (3 bar)
12 Auxiliary Feeds
Schematic Hydraulic Circuit
13 High-flow Pump
14 High-flow Valve
14A High-flow Pilot Valve
14B High-flow Control Valve
14C High-flow Circuit Relief Valve
15 Attachment Motor
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
*52 One-way Restrictor (see note 2)
X Return line fitted from machine no. 807226
Note 1: Excavator services shown here are to the JCB 'X'
control pattern. For ISO '+' control pattern, components 36
and 37 are swapped over.
Note 2: On machines fitted with a Husco Loader Valve, One-
way Restrictor 52 is deleted. On these machines a restrictor
is fitted in the Valve Block.
Run in Tandem
Component Key - High-flow Machine from machine no. 752463 - Dual Lever Drive Control
*
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