Section E - Hydraulics

Technical Data
General Data

Note: System Cleanliness is to be to ISO 16/13.

Main Valve Block

Table 1.
Nominal Flow 130 l/min.
Nominal Working Pressure 230 bar
MRV Setting 230 bar at 60 l/min.
Crowd/dump ARV 280 bar
Relief Pressure 95% of relief setting at 100cc/min.
Nominal Flow 130 l/min.

Smooth Ride System Valve Block

Table 2.
Input Flow 60 l/min.
Maximum Operating Pressure 280 bar
Nominal Flow 85 l/min.
Nominal Pressure 230 bar

Servo Cut Off Manifold

Table 3.
Input Flow 60 l/min.
Maximum Operating Pressure 280 bar
Nominal Flow 85 l/min.
Nominal Pressure 230 bar

Servo Cut Off Manifold 2 Speed

Table 4.
Input Flow 60 l/min.
Maximum Operating Pressure 280 bar
Nominal Flow 85 l/min.
Nominal Pressure 230 bar

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 Section E - Hydraulics
Technical Data
General Data

Self Level Valve (Optional)

Table 5.
Working Pressure 280 bar
Rated Flow 90 l/min.
System MRV setting 230 bar
System ARV setting 280 bar

Loader Pump - Standard (P3)

Table 6.
Type Tandem Gear
Maximum flow at 2400 rev/min. and 230 bar (3335 lbf/in ) 2 90.8 l/min. (20 UK gal/min., 24 US gal/min.)

Loader Pump - High-Flow (P3 and P5)

Table 7.
Type Triple gear
Maximum flow at 2400 rev/min.
- Loader Section (P3) 230 bar (3335 lbf/in2) 90.8 l/min. (20 UK gal/min., 24 US gal/min.)
- High Flow Section (P5) at 230 bar (3335 lbf/in2) 41.6 l/min. (9.2 UK gal/min., 11 US gal/min.)

Charge Pump (P4)

Table 8.
Type Tandem Gear
Maximum flow at 2400 rev/min. and 25 bar (363 lbf/in2) 34 l/min. (7.5 UK gal/min., 9 US gal/min.)

Return Line Filter

Table 9.
Maximum working pressure 50 bar
Maximum rated flow 100 l/min.
Filtration Level 10 Micron

Return Line Filter (High Flow)

Table 10.
Maximum working pressure 50 bar
Maximum rated flow 100 l/min.
Filtration Level 10 Micron

E-2 9803-9950-3 E-2

 Section E - Hydraulics
Technical Data
General Data

Rams
Dimensions

Table 11.
Ram Location Bore Rod Dia Stroke Weight
mm (in) mm (in) mm (in) Kg
Boom Lift 114.3 (4.5) 63.5 (2.5) 710 (27.95) 70.6
Tilt 101 (4.0) 50.8 (2.0) 328.9 (12.95) 36.9

Hydraulic Tank

Table 12.
Capacity 32 Litres (Total capacity)
26 Litres (To sight glass)

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 Section E - Hydraulics
Circuit Diagrams
Standard and High-flow Servo Machines

Standard and High-flow Servo Machines

Component Key
Table 19.
1 Transmission Pump
P1 Transmission Pump
P2 Transmission Pump
2 Right Hand Side Single Speed Motor
3 Left Hand Side Single Speed Motor
4 Right Hand Side Twin Speed Motor
5 Left Hand Side Twin Speed Motor
6 Charge Transducer
7 Return Filter
8 Tank
9 Pressure Breather
10 Tandem Gear Pump
P3 Loader Pump
P4 Charge Pump
11 High Flow Gear Pump (Optional)
P5 High Flow Pump (Optional)
12 Servo Control Valve - Right Hand
13 Servo Control Valve - Left Hand
14 Charge Filter
15 Fan Motor
16 Servo Cut-off Valve
17 Servo Control Valve 2 speed
18 Hydraulic Quickhitch (Optional)
19 Self Levelling Valve (Optional)
20 Oil Cooler Valve
21 Primary Control Valve
22 Float and SRS Valve (optional)
23 Float Valve (Optional)
24 Lift Cylinder
25 Crowd Cylinder
26 Quick Hitch Cylinder
27 Dead Engine Lower Valve

E-11 9803-9950-3 E-11

E-12

20

5 4 16

22

1 24 25

7 17
23
P1 P2

3 2
6
25
19 24

12 14
26
9803-9950-3

15
21
18

9
27 13

Standard and High-flow Servo Machines

8

Section E - Hydraulics
10
P3
P4

11 P3

Circuit Diagrams
P4
P5

T056160
Fig 8. Hydraulic Schematic - 332/X2024-1
E-12
 Section E - Hydraulics
Circuit Diagrams
Standard and High-flow Servo Machines

A
C
TANK

X3 2A
1B X4
X4 2B
1A X3

TANK
A

X3 X4
X4 X3

TANK
C

1A 2A
1B 2B
T058010
Fig 9. H Pattern Controls - Hand and Foot Controls

E-13 9803-9950-3 E-13

 Section E - Hydraulics

Valves
Main Valve Block

Description Table 22. Valves

Item Description
The cleanliness of this component is critical and must LV Load Hold Check
conform to JCB standard 9993/0003.
NC No Check Valve
The valve block consists of two hydraulic servo operated MRV Main Relief
spools controlling loader arm lift and carriage tilt functions ARV Auxiliary Relief
and a third servo operated attachments spool which is
controlled via two proportional solenoids on the valve. A
Table 23. Ports
main relief valve controls the maximum pressure
generated in the loader circuits. Port Description
I Inlet
When no service is selected the oil passes straight through R Outlet/Return
the neutral gallery of the valve block. When a service is
selected the neutral gallery is blocked by the selected D Hi Flow inlet (optional)
spool and oil is directed past the load hold check valve and 1A Loader Ram Rod
onto the ram to operate the service. Return oil from the ram
1B Loader Ram Head
is fed back through the spool into the valve block exhaust
gallery and back to tank. Note that loader raise and lower 2A Tilt Ram Head
return oil is fed back to the neutral gallery. 2B Tilt Ram Rod
3A Aux Flow A
An electrically operated servo cut-off valve is fitted in the
servo feed circuit. This is operated by the isolator switch to 3B Aux Flow B
allow spool movement only when the switch is closed, i.e. PB High Flow Drain (optional)
when the isolator bar and left hand arm rest is lowered.
T Return to Tank
A self level valve, fitted as an option, diverts a small P Pilot
amount of oil to the carriage tilt ram to give self levelling as
the loader arm is raised. The valve is electrically controlled
and can be switched on or off by the operator. 1A 1B 2A 2B 3A 3A
280 BAR 280 BAR
Table 20. Relief Settings
Bar (psi) P
Main Relief Valve 230 (3335) P
Tilt Circuit ARV 280 (4061) 230 BAR

High Flow Relief 227 (3300)

PB
Table 21. Sections
Item Description A
L B
L Loader D
P
B Tilt P
A Aux. T058490
Fig 10.

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 Section E - Hydraulics
Valves
Main Valve Block

D
LV
R
NC

PB

MRV P
ARV

L B A T
T056060
Fig 11. Main Valve Block

E-16 9803-9950-3 E-16

 Section E - Hydraulics
Valves
Main Valve Block

T057750
Fig 12. Cross Section

E-17 9803-9950-3 E-17

 Section E - Hydraulics
Valves
Smooth Ride System Valve

Smooth Ride System Valve

Description
The cleanliness of this component is critical and must
conform to JCB standard 9993/0003.

The SRS valve is located under the transmission pump.

Float is also incorporated into the valve. The ECU must
read from the transducer B 0 to 12 bar in the lift circuit
before the SRS solenoids are energized (loader arm must
be lowered). When the SRS switch is activated on the left
hand switch panel coils C, D and E are activated. The arm
can be raised and lowered without disabling SRS.

Table 24.
Item Description
A Accumulator (30 bar)
B Pressure Transducer
C,D SRS Coils
E,F Float Coils
G Lift Cylinder
T Tank

Float Operation

With the bucket on the ground 0 to 12 bar must be

measured in the arm raise line. Float can then be
activated. Coils E and F are activated.

T F D
E C

G
T058490-1
Fig 13.

E-19 9803-9950-3 E-19

 Section E - Hydraulics
Valves
Smooth Ride System Valve

T056080
Fig 14. Smooth Ride System Valve

E-20 9803-9950-3 E-20

 Section E - Hydraulics
Valves
Combination Valve

Combination Valve

Description increase or decrease the drive pressure. To control the

percentage push the turn signal to the left or right.
The cleanliness of this component is critical and must
conform to JCB standard 9993/0003. Table 25.
Solenoid Function
The combination valve is located under the cab in the left W Two speed
front corner of the chassis. The park brake and loader cut-
X Park brake release
off solenoids are interchangeable, the speed and drive coil
are not. Y Loader cut off
Z Drive pressure cut-off (creep)
The two speed solenoid W is proportionally controlled by
the ECU to provide soft shift.
Table 26.
The brake cut off solenoid X provides release pressure to Port Description
both drive motors. A Servo drive pressure to drive controller
C Servo pressure for loader control
The loader cut off solenoid Y supplies servo oil to the right
hand controller. BR1 Brake release pressure to left hand drive
motor
The drive pressure solenoid Z provides servo pressure to BR2 Brake release pressure to right hand drive
the drive controller and is also proportionally controlled by motor
the ECU for creep.
D Two speed shift pressure to left hand
drive motor
Servo Cut off and Park Brake Operation
D1 Return port for AUX servo control
Servo pressure enters the valve, charges the accumulator D2 Return port for AUX servo control
and provides servo pressure to the spools at the main
D3 Two speed shift pressure to right hand
control valve. Once all safety switches are closed and the
drive motor
operator depresses the park brake switch and servo cut off
switch the coils are energized via the ECU. This releases P1 Drive pressure feed from Y port on the
the spring applied brakes and supplies servo oil to the right transmission pump
hand controller. P2 Charge pressure input from transmission
pump MG port
Two Speed and Servo Drive Solenoid
ACC Maintains servo pressure at AUX circuit
The ECU will not energize the solenoid drive solenoid until AUX Servo pressure to main control valve
the park brake is released. Once the park brake is released splices at AUX spools to provide control
the ECU will energize the solenoid allowing full pressure to pressure
the drive controller. T Tank port

When the two speed button is pressed on the left hand

controller the ECU sends a PWM signal to the proportional
solenoid to shift into high range. At the same time the ECU
also sends a signal to the right dash panel to illuminate the
seat belt icon and two speed icon.

When the two speed button is pressed twice to engage

creep the ECU will control the servo drive PWM signal to

E-22 9803-9950-3 E-22

E-23
9803-9950-3

W X Y Z

Section E - Hydraulics
P1 P2 AUX
BR2
C D
T BR1
A D1 D2

Combination Valve
D3 ACC
T056100
Fig 15. Combination Valve - Two Speed Machine

Valves
E-23
 Section E - Hydraulics
Valves
Combination Valve

EHPR1
A

P1
SV2

1
2

D2
C

3
SV1
BR2

1
2

D1
BR1

3
ACC

CV1
AUX

T
P2

X Y Z

P2
P1 C AUX
BR2

BR1
T A ACC
D1 D2

T056120
Fig 16. Combination Valve - Single Speed Machine

E-24 9803-9950-3 E-24

 Section E - Hydraulics
Valves
Self Level Valve (Optional)

Self Level Valve (Optional)

Description
The cleanliness of this component is critical and must
conform to JCB standard 9993/0003. 2 3 4
The self level valve is mounted on the right hand side of the
chassis just in front of the drive motor.

Loader Raise

When the loader rises, the return oil enters the valve. Since
the solenoid is closed pressurised oil enters the flow
divider. The flow divider diverts the return oil through the E
check valve to the tilt ram. Since the tilt spool is closed off B
(centred) the oil is forced into the tilt ram causing it to level
while the loader is rising. Return oil from the tilt ram shifts
the flow modulator down allowing oil to return back to the
main control valve.
A

Loader Lower

When the loader lowers pressurised oil enters the valve.

This unseats the solenoid poppet and oil flow continues to T058490-2

the loader cylinder. The loader arm lowers and oil returns Fig 17.
to the main control valve.

Table 27.
Item Description
2 Loader lower port
3 Tilt ram dump port
4 Tilt ram crowd port
A Solenoid
B Flow divider
E Flow modulator

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 Section E - Hydraulics
Valves
Self Level Valve (Optional)

3 4 2

E B

T056130
Fig 18. Self Level Valve (Optional)

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 Section E - Hydraulics

Servo Joysticks
Description and Operation

Description
The joysticks basically comprise of a control lever 5, four
pressure adjustment valves and a housing 10.

Each pressure adjustment valve comprises of a control 5

spool 6, a control spring 7, a return spring 8 and a plunger
9.

Operation
12
When not actuated the control lever is held in zero position
by the four return springs 8. The control ports 1, 2, 3, 4 are
connected to the tank port T via the drilling 11.
9
With deflection of the control lever 5 the plunger 9 pushes
against the return spring 8and the control spring 7. The
control spring 7 firstly moves the control spool 6
8
downwards and closes the connection between the 7
appropriate port and tank port T. At the same time the
appropriate port is connected to the port P via the drilling 10
11. The control phase begins as soon as the control spool
6 has found its balance between the force of the control
spring 7 and the force which results from the hydraulic
pressure in the appropriate port ports 1, 2, 3 or 4.
11
Through the interaction of control spool 6 and control
spring 7 the pressure in the appropriate ports is 6
proportional to the stroke of the plunger 9 and thus the T057530

position of the control lever 5. Fig 19.

A rubber boot 12 protects the mechanical components of Table 28.

the housing from contamination. Port Description
P Supply
T Tank
1,2,3,4 Control

E-29 9803-9950-3 E-29

 Section E - Hydraulics
Servo Joysticks
Removal and Replacement

T056170
Fig 20.

E-31 9803-9950-3 E-31

 Section E - Hydraulics

Gear Pumps
Description

General
The standard machine has two gear pumps. The high flow
machine has three gear pumps. The gear pumps are
bolted onto the transmission pumps in series.

Table 29.
Pump Description Displacement
(cc)
P3 Loader Pump 38
P4 Charge Pump 14
P5 High Flow Pump 17

The pumps are fixed displacement triple gear type and are
direct driven by the engine. The high flow pump section
has an integrated unloader valve section.

P3 P4
P5

Fig 21.

Loader pump P3 delivers oil flow to the machines services.

The oil flow passes through the main control valve and
joins the flow from high-flow gear pump P5 (if fitted), Oil
returns to tank via a filter and cooler.

Charge pump P4 delivers oil flow to main pumps P1 and

P2 via filter F1 and the hydraulic fan. Flow is then provided
to the loader and transmission servo joysticks.

E-33 9803-9950-3 E-33

 Section E - Hydraulics

Motor
Hydraulic Fan Motor

Introduction 6 Remove the hydraulic motor, cap the ports with

blanking caps to prevent loss of fluid and ingress of
The cleanliness of this component is critical and must dirt.
conform to JCB standard 9993/0003.
Replacement
Removal
1 Replacement is a reversal of the removal procedure.

!MWARNING 2 Ensure all hoses and ports are clean and free from
Make the machine safe before working on it. Park the dirt.
machine on level ground and lower the loader arm.
Stop the engine and remove the starter key. Make sure
the park brake is engaged. Disconnect the battery to
prevent the engine being started. Block all four
wheels.
3-3-1-2

!MWARNING
Hydraulic Pressure
Hydraulic fluid at system pressure can injure you.
Before connecting or removing any hydraulic hose,
residual hydraulic pressure trapped in the service
hose line must be vented. Make sure the hose service
line has been vented before connecting or removing
hoses. Make sure the engine cannot be started while
the hoses are open.
INT-3-1-11_2

1 Make the machine safe with the loader arm on the

ground. Refer to Maintenance, Prepare the
Machine for Maintenance.

2 Mark all hoses to ensure correct replacement.

3 Remove the hoses, cap the ends with blanking caps

to prevent loss of fluid and ingress of dirt.

4 Remove the fan from the motor and disconnect the

electrical connections.

5 Support the hydraulic motor and remove the two M10

bolts.

Component weight 14.3 lbs (6.5 kg)

E-39 9803-9950-3 E-39

 Section E - Hydraulics
Motor
Hydraulic Fan Motor

5
4
6

6 1

3
T056060
Fig 29. Hydraulic Motor

Table 30.
Item Description
1 Hydraulic fan motor
2 Adaptor
3 Adaptor
4 Bolt M10
5 Washer M10
6 Lock nut M10
7 Adaptor

E-40 9803-9950-3 E-40

 Section E - Hydraulics
Hydraulic System
Hydraulic Tank

5 2
6

6 3
T056150
Fig 30. Hydraulic Tank

Replacement Table 32.

Port Torque
1 Replacement is a reversal of the removal procedure. 2 110 Nm
4 150 Nm
2 Ensure all hoses and ports are clean and free from
dirt. 5 27 Nm
7 150 Nm
Table 31.
8 150 Nm
Item Torque
1 10 Nm
3 30 Nm
6 22 Nm
9 22 Nm

E-42 9803-9950-3 E-42