Content .. 10 11 12 13 ..

JCB 3CX, 4CX, 214e, 214, 215, 217 & VARIANTS Backhoe Loader. Service Manual - page 12

Section E

Hydraulics

2 - 11

Technical Data

2 - 11

Relief Valve Pressures

Auxiliary Valve - Fixed Flow

bar

kgf/cm²

lbf/in²

Extradig Ram Head Side

138 - 145

141 - 148

2000 - 2100

Extradig Ram Rod Side

207 - 214

211 - 218

3000 - 3100

Jaw Bucket Ram Head Side

138 - 145

141 - 148

2000 - 2100

Jaw Bucket Ram Rod Side

207 - 214

211 - 218

3000 - 3100

Knuckle Ram Head Side

138 - 145

141 - 148

2000 - 2100

Knuckle Ram Rod Side

207 - 214

211 - 218

3000 - 3100

Hammermaster

207 - 214

211 - 218

3000 - 3100

Power Sideshift (both)

207 - 214

211 - 218

3000 - 3100

Hand Held Tools

138 - 150

141 - 153

2000 - 2200

Component Key:

Auxiliary Spool

Inlet port

Outlet port

Auxiliary relief valve

High pressure carry-over (HPCO) port

Service ‘A’ ports

Service ‘B’ ports

Weight:

TBA kg (TBA lbs)

9803/3280

Issue 1

Section E

Hydraulics

2 - 13

Technical Data

2 - 13

Smooth Ride System

System Type

A piston type accumulator operates as a liquid spring

absorbing displaced fluid from the lift rams. Selectable

from a switch in the cab.

Charging Gas

Air Free Dry Nitrogen

Accumulator Capacity

1.0 litre (58 cu/in)

Accumulator Weight

4.4 kg (9.75 lb)

Accumulator Charge Pressure

As a general guide for given shovel weights (loaded) see below:-

bar

kgf/cm²

lbf/in²

Shovel weights up to 700 kg (1540 lb)

13.8

200

Shovel weights 700 kg to 950 kg (1540 - 2100 lb)

19.4

275

Shovel weights over 950 kg (2100 lb)

24.5

350

Note: Replacement accumulators will only be supplied in an uncharged, non pressureised condition to meet Health and

Safety/Airfreight hazardous goods requirements.

9803/3280

Issue 1

Component Location

A401400

Component Location

Neutral Circuit Description

Component Key:

Fixed Flow - Single Pump

Hydraulic Tank

Hydraulic Pump (engine driven)

1B Hose - High Pressure Carry Over

Oil is drawn from the hydraulic tank T by the single

Loader Valve Block

stage hydraulic pump P. The pump is mounted on

Excavator Valve

the rear of the gearbox and is engine driven via a

Return Line Filter (inside hydraulic tank)

driveshaft.

Steer Circuit Priority Valve

Return Line Check Valve

Pressurised oil from the pump flows to steering

Hydraulic Oil Cooler

priority valve 7, and in neutral circuit flows through

the priority valve to the loader valve 3.

From the loader valve neutral gallery, oil flows via a

high pressure carry-over line 1B to the excavator

valve 4.

Some of the exhaust oil flows directly back to the

tank through an in-tank filter 6, and some of the

exhaust oil returns to tank via the hydraulic oil

cooler 26.

To help prevent excavator dipper ram and loader lift

ram cavitation, there is a check valve 13 fitted to

the return line. The check valve raises

approximately 5 bar (75 lbf/in²) of pressure in the

line, which improves the operation of the respective

anti-cavitation valves.

Component Location

A401420

Component Location

Neutral Circuit Description

Component Key:

Fixed Flow - Double Pump

T Hydraulic Tank

P1 Hydraulic Pump (main section)

Oil is drawn from the hydraulic tank T by the

P2 Hydraulic Pump (secondary section)

hydraulic pump. The pump has two sections, P1

1B Hose - High Pressure Carry Over

and P2.

Loader Valve Block

Excavator Valve

The hydraulic pump is mounted on the rear of the

Auxiliary Valve

gearbox and is driven by the engine via a

Return Line Filter (inside hydraulic tank)

driveshaft.

Steer Circuit Priority Valve

Return Line Check Valve

Oil from the larger section P1 flows direct to the

Hydraulic Oil Cooler

loader valve 3. Oil from pump section P2, flows to

Hydraclamp exhaust hose

steering priority valve 7, and in neutral circuit flows

through the priority valve to the auxiliary valve 5

and then to join the flow from P1 at the loader

valve.

From the loader valve neutral gallery, oil flows via a

high pressure carry-over line 1B to the excavator

valve 4.

Some of the exhaust oil flows directly back to the

tank through an in-tank filter 6, and some of the

exhaust oil returns to tank via the hydraulic oil

cooler 26.

To help prevent excavator dipper ram and loader lift

ram cavitation, there is a check valve 13 fitted to

the return line. The check valve raises

approximately 5 bar (75 lbf/in²) of pressure in the

line, which improves the operation of the respective

anti-cavitation valves.

On sideshift machines only, hydraclamp exhaust

hose

62 is fitted. The hose connects the

hydraclamp spool directly into the exhaust circuit.

This prevents the clamps from ‘locking-up’ when

the sideshifting operation is required.

Component Location

A401430

Component Location

Neutral Circuit Description

Component Key:

Variable Flow

Hydraulic Tank

The variable flow displacement pump P is mounted

Hydraulic Pump (engine driven)

on the rear of the gearbox and is engine driven via

1A Pump Outlet Pipe/Hose

a driveshaft.

Loader Valve Block

Excavator Valve

With variable flow hydraulics, there is no ‘neutral’

Return Line Filter (inside hydraulic tank)

circuit. This is because the pump P operates on a

Return Line Check Valve

demand signal from the services (see Circuit

Hydraulic Oil Cooler

Descriptions, Hydraulic Pump - Variable Flow

Operation). If there is no demand, then the pump

does not draw oil from the tank and no oil is

delivered, there is no pump flow in the neutral

position.

When a service is selected, the pump senses the

demand and oil is drawn from the hydraulic tank T.

Pressurised oil from the pump flows to the loader

valve 3 and/or the excavator valve 4 via hose and

pipe assembly 1A.

The loader valve 3 is fitted with a priority inlet

manifold, oil entering the loader valve is distributed

to the (priority) steer circuit and/or the loader

services as required (see Circuit Descriptions,

Loader Valve - Variable Flow Operation).

Some of the exhaust oil flows directly back to the

tank through an in-tank filter 6, and some of the

exhaust oil returns to tank via the hydraulic oil

cooler 26.

To help prevent excavator dipper ram and loader lift

ram cavitation, there is a check valve 13 fitted to

the return line. The check valve raises

approximately 5 bar (75 lbf/in²) of pressure in the

line, which improves the operation of the respective

anti-cavitation valves.

Section E

Hydraulics

Section E

3 - 10

Basic System Operation

3 - 10

Introduction to Hydraulic Schematic

Pumps & Motors

Symbols

Complex hydraulic components and circuits can be

Variable capacity pump

described to the engineer by using graphical symbols. The

two directions of flow

following pages illustrate and give a brief description for

some of the more common symbols used.

There are many symbols in use and it would be impossible

to include them all here. However it should be noted that

Fixed capacity motor

most are only variations or refinements on the basic

one direction of flow

principles explained here. If more detailed information is

required you are recommended to obtain a copy of BS2917

or IS01219.

Fixed capacity motor

Once familiar with the symbols, the engineer can use

two directions of flow

hydraulic circuit diagrams as an aid to fault finding. It will be

possible to see the complete hydraulic circuit and decipher

the relationship between hydraulic components.

General (Basic & Functional Symbols)

Variable capacity motor

one direction of flow

Spring

Flow restriction

affected by viscosity

Variable capacity motor

two directions of flow

Direction of flow

Indication of rotation

Indication of direction

and paths of flow

A189660

Variable control

Rams

Single acting

Double acting

Double ended

Double acting with

damping at rod area end

A189670

A189680

9803/3280

Issue 1

Section E

Hydraulics

Section E

3 - 11

Basic System Operation

3 - 11

Introduction to Hydraulic Schematic

Symbols (cont'd)

Control Valves

One way restrictor

Used to enclose several

valves indicating that they

are supplied as one unit

High pressure selector

3-Position, 4-Port

(shuttle valve)

spring centred pilot

operated valve

3-Position, 6-Port

Throttling orifice -

spring centred hand

normally closed

operated valve

3-Position, 4-Port

spring centred solenoid &

pilot pressure operated valve

Throttling orifice -

normally open

3-Position, 4-Port

spring centred detent

hand operated valve

Relief valve

Non - return valve

Non - return valve with

back pressure spring

Variable restrictor

Pilot operated

non - return valve

A189700

A189690

9803/3280

Issue 1

Section E

Hydraulics

Section E

3 - 12

Basic System Operation

3 - 12

Introduction to Hydraulic Schematic

Symbols (cont'd)

Energy Transmissions and Conditioning

Working line, return or feed

Reservoir - return line

above fluid level

Pilot control

Reservoir - return line

below fluid level

Drain lines

Flexible pipe

Header tank

Pressure sealed tank

Line junction

Accumulator

Crossing lines

Filter or strainer

Air bleed

Water trap

Line plugged, also

pressure test point

Cooler - with no

indication of coolant flow

Line plugged with

take off line

Cooler - indicating

direction of coolant flow

Quick release

couplings - connected

Heater

A189710

A189720

Quick release

couplings - disconnected

9803/3280

Issue 1

Section E

Hydraulics

Section E

3 - 13

Basic System Operation

3 - 13

Introduction to Hydraulic Schematic

Symbols (cont'd)

Control Mechanisms

Rotating shaft-one direction

Solenoid one winding

Rotating shaft-two directions

Solenoid two winding

Detent

Electric motor operated

Locking device

Internal pressure

pilot operated

Over centre device

External pressure

pilot operated

Simple linkage

Pressure operated

spring release

General control

Pilot operated by solenoid

pilot valve

Push button operated

Pilot operated by a solenoid

or separate pilot valve

Lever operated

Pressure gauge

Pedal operated

Stem operated

Pressure switch

Spring operated

Roller operated

Roller trip operated

(one directional)

S189730

S189740

9803/3280

Issue 1

Section E

Hydraulics

Section E

3 - 14

Basic System Operation

3 - 14

Introduction to Hydraulic Schematic

Symbols (cont'd)

Position 1

Position 2

Position 3

Control Valves

Control valves are usually represented by one or more

square boxes.

Fig. 1 shows a control valve represented by three boxes.

FIG 2

The number of boxes indicates the number of possible valve

operating positions, (4 boxes - 4 positions etc).

Fig. 2 - In circuit diagrams the pipework is usually shown

connected to the box which represents the unoperated

condition. (Hydraulic circuit diagrams are usually shown in

the unoperated condition).

Fig. 3 shows a valve described as a 3- position, 4-port

control valve. Port describes the openings to and from the

valve by which the hydraulic fluid enters or leaves. In the fig

shown, Position 2 indicates that in an unoperated condition

Port 1

Port 3

all 4 ports are blocked.

FIG 3

If the valve spool was moved to Position 1, movement of the

spool would connect Port 1 to Port 2, and Port 3 to Port 4.

If the valve spool was moved to Position 3, movement of the

spool would connect Port 1 to Port 4, and Port 3 to Port 2.

It must be noted that not all spools are of the same type.

Their operating designs can be seen by following the path

the flow arrows take in their respective operating squares.

Port 2

Port 4

Three typical JCB style spools are known as 'D' spools, 'F'

spools and 'N' spools.

The 'D' spools generally control rams because when in the

FIG 4

neutral position the outlet ports are blocked, preventing ram

movement. Fig 3 shows a 'D' type spool.

Fig 4 - 'F' spools are often shown as four position spools

with the three normal positions for neutral and service

control; and the forth position, which has a detent, connects

both sides of the ram together to allow the service to 'float'.

Fig 5 - 'N' spools are sometimes used to control hydraulic

motors, and it can be seen from the flow arrows, that in

neutral position both service ports are connected to the

exhaust oil port

FIG 5

A189760

9803/3280

Issue 1

Section E

Hydraulics

Section E

3 - 15

Basic System Operation

3 - 15

Introduction to Hydraulic Schematic

Symbols (cont'd)

Example of Schematic Circuit

Some of the symbols described on the preceding pages

Example Circuit Key

have been arranged into a simple schematic circuit shown

below.

Hydraulic Tank

Strainer

Hydraulic tank A is a pressurised tank with an internally

Fixed Displacement Pump

mounted strainer B on the suction line to the fixed

Relief Valve

displacement pump C. System pressure is limited to the

Spool

setting of relief valve D.

One Way Valve

Double Acting Hydraulic Ram

Valve spool E is an open-centre spool that is in neutral

position; flow from the pump passes through the spool and

returns to the hydraulic tank.

If the lever operated spool is moved away from neutral

position hydraulic fluid is directed to either head side or rod

side of hydraulic ram G. Notice that the fluid must first open

one way valve F before flowing to the ram.

A189770

9803/3280

Issue 1

Section E

Hydraulics

3 - 20

Circuit Schematics - Fixed Flow

3 - 20

Check Valve (optional)

3CX, 4CX, 214, 215, 217 & ‘S’ Series Machines

Smooth Ride System Selector Valve Assembly

Smooth Ride System Accumulator

The policy of JCB is one of continuous improvement,

Hydraulic Oil Cooler

therefore as products develop, there may be variations to

Shovel Ram R.H.

the circuits.

Shovel Ram L.H.

Lift Ram R.H.

Component Key

Lift Ram L.H.

Tank Cap

Clam Shovel Ram R.H.

Connections (as applicable)

Clam Shovel Ram L.H.

Pump, Main Section

2 Wheel Steer Power Track Rod

Pump, Secondary Section

AWS Rear Axle Power Track Rod

P2A

Pressure Test Point (auxiliary & unloader)

AWS Front Axle Power Track Rod

Suction Line

AWS Valve Assembly

Tank

Steer Control Valve

Connections (as applicable)

Shock Valves

Quick Release Couplings

Steer Control Valve Relief Valve

Neutral Circuit Line

Bucket Ram

Neutral Circuit Line

Boom Ram

Neutral Circuit Line

Stabiliser Ram

Loader Valve Block

Stabiliser Ram

Pressure Test Point (M.R.V.)

Dipper Ram

Unloader Pilot Valve

Left Hand Slew Ram

Loader Lift Ram Spool

Right Hand Slew Ram

Loader Shovel Ram Spool

Stabiliser Check Valve

Clamshovel Spool

Hydraclamps (Sideshift Machines Only)

Shovel Ram Head Side A.R.V.

Restrictor

Shovel Ram Rod Side A.R.V.

Dipper Restrictor with By-Pass

Load Hold Check Valve

Manual Isolation Valve

Unloader Valve Spool

Manual Change Over Valve

Main Relief Valve

Extending Dipper Ram

Unloader Check Valve

High Flow Options

Hydraulic Speed Control Solenoid

Low Flow options

Excavator Valve Block

Excavator services shown here are to the JCB control

pattern. If ISO, Case or Ford control pattern is used, the

excavator spools and relief valves will apply to different

services.

HIGH FLOW OPTIONS

Slew Spool

Boom Spool

Stabiliser Spool

Dipper Spool

Bucket Spool

Hydraclamp Valve (Sideshift Machines Only)

Slew A.R.V.

Boom Ram Rod Side A.R.V.

Boom Ram Head Side A.R.V.

Dipper Ram Head Side A.R.V.

Dipper Ram Rod Side A.R.V.

Bucket Ram Head Side A.R.V.

Auxiliary Valve Block (foot operated)

LOW FLOW OPTIONS

Auxiliary Spool

A.R.V.

In-tank Filter

Filter By-pass Valve

Hammer

Suction Strainer

Priority Valve

Filter

Diverter Valve (hammer only)

Sequence Valve (hammer only)

EXTENDING

DIPPER

Flow Regulator Valve

A325660

Anti-cavitation Check Valve

9803/3280

Issue 1

Section E

Hydraulics

Section E

3 - 21

Circuit Schematics - Fixed Flow

3 - 21

3CX, 4CX, 214, 215, 217 & ‘S’ Series Machines

ACC

P2A

A262643

9803/3280

Issue 1

Section E

Hydraulics

Section E

3 - 22

Circuit Schematics - Fixed Flow

3 - 22

3CX ‘S’ Series & 4CX Gear Pump Options

3CX ‘S’ Series Options

This circuit shows the Extending Dipper and Power

This circuit shows the Low Flow Hammer, Extending Dipper

Sideshift, for the main hydraulic circuit see pages E/3-20

and Power Sideshift, for the main hydraulic circuit see

and E/3-21.

pages E/3-20 and E/3-21.

Component Key

HPCO High Pressure Carry Over (From Excavator Valve

Block 4)

Hydraulic Connections

Quick Release Couplings

Hydraulic Tank Return

Diverter valve

Sequence valve

Extending Dipper Ram

Change Over Valve

Power Sideshift Cylinder

Relief Valve

Isolation Valve

Manual Change Over Valve

Hammer

Isolation Valve

HPCO

A325670

A327030

9808/3280

Issue 1

Section E

Hydraulics

3 - 23

Circuit Schematics - Fixed Flow

3 - 23

3CX ‘S’ Series Options

This circuit shows the Low Flow Hammer and Extending

Dipper, for the main hydraulic circuit see pages E/3-20 and

E/3-21.

Component Key

HPCO High Pressure Carry Over (From Excavator Valve

Block 4)

Hydraulic Connections

Hydraulic Tank Return

Sequence valve

Extending Dipper Ram

Isolation Valve

Hammer

HPCO

A327040

9803/3280

Issue 1

Section E

Hydraulics

3 - 24

Circuit Schematics - Fixed Flow

3 - 24

214e Machines

Component Key:

Hydraulic Tank

Return filter

Hydraulic Oil Cooler

Hydraulic Pump

Twin Check Valve

Shovel Rams

Quick Release Couplings

Lift Rams

Loader Valve Block

Main Relief Valve

Auxiliary Spool

Lift Spool

Shovel Spool

Flow Regulator Valve (Option)

Pressure Test Point

Auxiliary Valve Block (Option)

Either option K or M can be fitted but not both.

Steer Control Valve

Auxiliary Rams

Priority Valve

Excavator Valve Block

Slew Spool

Boom Spool

Stabiliser Spool

Dipper Spool

Bucket Spool

Stabiliser Rams

One Way Restrictor

Slew Rams

Boom Ram

Dipper Ram

Bucket Ram

Suction Strainer

Stabiliser Check Valve

Last Chance Filter

Tank Cap

Extending Dipper

2WS Front Power Track Rod

Note: For smooth ride system schematic, refer to Circuit

Descriptions - Smooth Ride System.

9803/3280

Issue 2*

Section E

Hydraulics

Section E

3 - 25

Circuit Schematics - Fixed Flow

3 - 25

214e Machines

NEUTRAL CIRCUIT H.P.C.O.

SLEW

SHOVEL

BOOM

ENGINE

LOADER

STABILISER

AUX

STABILISER

DIPPER

MRV

BUCKET

H.P.C.O.

HAMMERMASTER

260L

280

360

NEUTRAL CIRCUIT / TANK RETURN

HAMMER RETURN

HAMMER FEED

A408750

9803/3280

Issue 2*

Section E

Hydraulics

Section E

3 - 26

Circuit Schematics - Variable Flow

3 - 26

4CXE, 4CX Super Machines

(7 Spool With High Flow Options)

15A

PRLS

ACC

16A

A278942

9803/3280

Issue 1

Section E

Hydraulics

3 - 27

Circuit Schematics - Variable Flow

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).

Stabiliser Ram

Hydraulic Tank

Stabiliser Ram

By-pass Filter

Dipper Ram

Suction Line

Bucket Ram

Pump Variable Flow

Accumulator

Stroking Piston

Oil Cooler

Control Piston

Load Sense Relief Valve

System Pressure Spool

Steer Unit Assembly

Stand-by Pressure Spool

Steer Valve

Hydraclamp Valve

Relief Valve

Hydraclamps

Shock Valves

Loader Valve Block

Quick release Couplings

Priority Inlet Section

Isolation Valve

Relief Valve †

Extending Dipper Isolation Valve

Auxiliary Service Spool

Foot Valve

Shovel Service Spool

Extending Dipper Ram

Lift Service Spool

Hammer

Auxiliary Relief Valves (anti-cavitation)

15A

ARV item 16 if Rockerbreaker Application

† Note: Steer circuit pressure is controlled by a relief valve

Auxiliary Relief Valves (direct acting)

housed in the hydraulic steer unit (refer to Section H

16A

ARV Only Fitted For Rockbreaker Application

Steering). The priority relief valve housed in the loader valve

Secondary Shuttle Valve

must be set at 2500 lb/in² (173 bar, 176 kgf/cm²) this will

Primary Shuttle Valve

ensure it does not interfere with the operation of the relief

Load Hold Check Valve

valve housed in the hydraulic steer unit.

Auxiliary Rams

Shovel Rams

Lift Rams

Smooth Ride Selector Valve

Smooth Ride Accumulator

Backhoe Loader Valve Block

Extradig Priority Valve

Extradig Service Spool

Compensator Valves

Slew Service Spool

Boom Service Spool

Stabiliser Service Spool

Dipper Service Spool

Bucket Service Spool

Extradig Ram

Slew Rams

Boom Ram

9803/3280

Issue 1

Section E

Hydraulics

3 - 28

Circuit Schematics - Variable Flow

3 - 28

4CX, 4CX Super Machines

(6 Spool With High/Low 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).

Stabiliser Ram

Hydraulic Tank

Stabiliser Ram

By-pass Filter

Dipper Ram

Suction Line

Bucket Ram

Pump Variable Flow

Accumulator

Stroking Piston

Oil Cooler

Control Piston

Load Sense Relief Valve

System Pressure Spool

Steer Unit Assembly

Stand-by Pressure Spool

Steer Valve

Hydraclamp Valve

Relief Valve

Hydraclamps

Shock Valves

Loader Valve Block

Quick release Couplings

Priority Inlet Section

Isolation Valve

Relief Valve †

Hammer

Auxiliary Service Spool

Load Sense Isolation Valve

Shovel Service Spool

Lift Service Spool

† Note: Steer circuit pressure is controlled by a relief valve

Auxiliary Relief Valves (anti-cavitation)

housed in the hydraulic steer unit (refer to Section H

Auxiliary Relief Valves (direct acting)

Steering). The priority relief valve housed in the loader valve

16A

ARV Only Fitted For Rockbreaker Application

must be set at 2500 lb/in² (173 bar, 176 kgf/cm²) this will

Secondary Shuttle Valve

ensure it does not interfere with the operation of the relief

Primary Shuttle Valve

valve housed in the hydraulic steer unit.

Load Hold Check Valve

Auxiliary Rams

Shovel Rams

Lift Rams

Smooth Ride Selector Valve

Smooth Ride Accumulator

Backhoe Loader Valve Block

Compensator Valves

Slew Service Spool

Boom Service Spool

Stabiliser Service Spool

Dipper Service Spool

Bucket Service Spool

Slew Rams

Boom Ram

9803/3280

Issue 1

Section E

Hydraulics

3 - 29

Circuit Schematics - Variable Flow

3 - 29

4CXE, 4CX Super Machines

(6 Spool With High Flow Options)

PRLS

ACC

A327070

A347590

16A

9803/3280

Issue 1

Section E

Hydraulics

3 - 30

Circuit Schematics - Variable Flow

3 - 30

4CX, 4CX Super Machines

Hand Held Tools Option

A322650

Component Key

Pump Variable Flow

Hydraulic Tank

Main Circuit Connection

Pressure Flow Regulator

High Pressure Flow Spool

Relief Valve (2000 lb/in² - 138 bar - 146 kgf/cm²)

Load Sense Solenoid

Hand Held Tool

Shuttle Valve

Excavator Valve Block

Loader Valve Block

9803/3280

Issue 1

Section E

Hydraulics

Section E

3 - 31

Basic System Operation

3 - 31

Hydraulic Circuit Schematic

Precision Control (Servo)

(Machines up to serial no. 931159)

Component Key:

Tank

Anti Cavitation Check Valve

Breather

Hydraulic Oil Cooler

Fill Screen

Steer Unit

Suction Strainer

Priority Valve

Pump, Main Section

2WS Power Track Rod Ram

Pump, Secondary Section

Extending Dipper Ram

Loader Valve Block

Lift Ram L.H.

Extending Dipper Spool

Lift Ram R.H.

Loader Lift Ram Spool

Shovel Ram L.H.

Loader Shovel Ram Spool

Shovel Ram R.H.

Clamshovel Spool

Clam Shovel Ram L.H.

Extending Dipper Ram Rod Side A.R.V.

Clam Shovel Ram R.H.

Extending Dipper Ram Head Side A.R.V.

Bucket Ram

Shovel Ram Head Side A.R.V.

Dipper Ram

Shovel Ram Rod Side A.R.V.

Stabiliser Ram

Unloader Valve Spool

Stabiliser Ram

Main Relief Valve (MRV)

Boom Ram

Unloader Check Valve

Slew Ram L.H.

Unloader Pilot Valve

Slew Ram R.H.

Hydraulic Speed Control Solenoid

Hydraclamps (Sideshift Only)

Excavator Valve Block

Slew Spool

Boom Spool

Right Stabiliser Spool

Left Stabiliser Spool

Dipper Spool

Bucket Spool

Auxiliary Spool

Hydraclamp Valve (Sideshift Only)

Slew A.R.V.

Dipper Ram Head Side A.R.V.

DipperRam Rod Side A.R.V.

Boom Ram Rod Side A.R.V.

Boom Ram Head Side A.R.V.

Bucket Rod Side ARV (Hammer Only)

Bucket Ram Head Side A.R.V.

Bypass Compensator Valve

Load Sense Drain Regulator and Relief Valve

Pilot Operated Check Valve (Hydraclamp)

9803/3280

Issue 2*

Content .. 10 11 12 13 ..