3 - 27
4CX, 4CX Super Machines
(7 Spool With High Flow Options)
Component Key
Small letters on the schematic indicate port markings. Refer
to Technical Data pages at the beginning of this section for
more information. Ports A and B are always identified as
service ports (feed and return from respective ram).
T Hydraulic Tank
1 By-pass Filter
2 Suction Line
P Pump Variable Flow
3 Stroking Piston
4 Control Piston
5 System Pressure Spool
6 Stand-by Pressure Spool
7 Hydraclamp Valve
8 Hydraclamps
9 Loader Valve Block
10 Priority Inlet Section
11 Relief Valve †
12 Auxiliary Service Spool
13 Shovel Service Spool
14 Lift Service Spool
15 Auxiliary Relief Valves (anti-cavitation)
15A ARV item 16 if Rockerbreaker Application
16 Auxiliary Relief Valves (direct acting)
16A ARV Only Fitted For Rockbreaker Application
17 Secondary Shuttle Valve
18 Primary Shuttle Valve
19 Load Hold Check Valve
20 Auxiliary Rams
21 Shovel Rams
22 Lift Rams
23 Smooth Ride Selector Valve
24 Smooth Ride Accumulator
25 Backhoe Loader Valve Block
26 Extradig Priority Valve
27 Extradig Service Spool
28 Compensator Valves
29 Slew Service Spool
30 Boom Service Spool
31 Stabiliser Service Spool
32 Stabiliser Service Spool
33 Dipper Service Spool
34 Bucket Service Spool
35 Extradig Ram
36 Slew Rams
37 Boom Ram
38 Stabiliser Ram
39 Stabiliser Ram
40 Dipper Ram
41 Bucket Ram
42 Accumulator
43 Oil Cooler
44 Load Sense Relief Valve
45 Steer Unit Assembly
46 Steer Valve
47 Relief Valve
48 Shock Valves
49 Quick release Couplings
50 Isolation Valve
51 Extending Dipper Isolation Valve
52 Foot Valve
53 Extending Dipper Ram
54 Hammer
† Note: Steer circuit pressure is controlled by a relief valve
housed in the hydraulic steer unit (refer to Section H
Steering). The priority relief valve housed in the loader valve
must be set at 2500 lb/in
2
(173 bar, 176 kgf/cm
2
) this will
ensure it does not interfere with the operation of the relief
valve housed in the hydraulic steer unit.
Section E
Hydraulics
9803/3280
Section E
3 - 27
Issue 1
Circuit Schematics - Variable Flow
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