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Section E
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
9803/3280
Hydraulics
Circuit Schematics - Variable Flow
Purchased from www.WorkshopManuals.co.uk
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
2
must be set at 2500 lb/in
ensure it does not interfere with the operation of the relief
valve housed in the hydraulic steer unit.
Section E
3 - 27
2
(173 bar, 176 kgf/cm
) this will
Issue 1
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