Case ih puma 155 tractor service repair manual

Printed in U.S.A.
Copyright © 2010 CNH America LLC. All Rights Reserved.
Case IH is a registered trademark of CNH America LLC.
Racine Wisconsin 53404 U.S.A.
PUMA 115
PUMA 125
PUMA 140
PUMA 155
Tractor with/without Multicontroller
Part number 87727132BNA
English
December 2010
Replaces part number 87727132
SERVICE MANUAL

SERVICE MANUAL
PUMA 115 , PUMA 125 Multicontroller , PUMA 125 , PUMA 140 Multicontroller
, PUMA 140 , PUMA 155 Multicontroller , PUMA 155
87727132B 13/04/2010

Contents
INTRODUCTION
HYDRAULIC - PNEUMATIC - ELECTRICAL - ELECTRONIC SYSTEMSA
PRIMARY HYDRAULIC POWER SYSTEM............................................... A.10.A
PRIMARY HYDRAULIC POWER SYSTEM Closed center mechanical remote valve .... A.10.B
PRIMARY HYDRAULIC POWER SYSTEM Electro-hydraulic remote valve.............. A.10.C
SECONDARY HYDRAULIC POWER SYSTEM........................................... A.12.A
PNEUMATIC SYSTEM .................................................................... A.20.A
ELECTRICAL POWER SYSTEM ......................................................... A.30.A
ELECTRICAL POWER SYSTEM ......................................................... A.30.A
ELECTRONIC SYSTEM .................................................................. A.50.A
FAULT CODES ............................................................................ A.50.A
ENGINE AND PTO IN ....................................................................B
ENGINE ................................................................................... B.10.A
FUEL AND INJECTION SYSTEM......................................................... B.20.A
AIR INTAKE SYSTEM..................................................................... B.30.A
EXHAUST SYSTEM....................................................................... B.40.A
ENGINE COOLANT SYSTEM ............................................................ B.50.A
LUBRICATION SYSTEM .................................................................. B.60.A
STARTING SYSTEM ...................................................................... B.80.A
TRANSMISSION, DRIVE AND PTO OUT.........................................C
TRANSMISSION Powershift .............................................................. C.20.E
ADDITIONAL REDUCERS Creeper...................................................... C.30.C
ADDITIONAL REDUCERS Overdrive .................................................... C.30.D
REAR PTO Hydraulic..................................................................... C.40.C
TRANSMISSION Semi-Powershift ....................................................... C.20.D
AXLES, BRAKES AND STEERING..................................................D
FRONT AXLE ............................................................................. D.10.A
REAR AXLE ............................................................................... D.12.A
2WD-4WD SYSTEM Hydraulic........................................................... D.14.C
87727132B 13/04/2010

STEERING Hydraulic..................................................................... D.20.C
STEERING AutoPilot ...................................................................... D.20.E
SERVICE BRAKE Mechanical ............................................................ D.30.B
SERVICE BRAKE Hydraulic.............................................................. D.30.C
SERVICE BRAKE Pneumatic ............................................................. D.30.E
PARKING BRAKE Mechanical ............................................................ D.32.B
BRAKE CONNECTION Hydraulic ........................................................ D.34.C
SUSPENSION Hydraulic ................................................................. D.40.C
WHEELS AND TRACKS Wheels......................................................... D.50.C
PARKING BRAKE Electronic ............................................................. D.32.D
FRAME AND CAB .........................................................................E
FRAME Primary frame .................................................................... E.10.B
SHIELD.................................................................................... E.20.A
USER PLATFORM ........................................................................ E.34.A
ENVIRONMENT CONTROL Heating, ventilation and air-conditioning.................... E.40.D
HITCH AND WORKING TOOL ........................................................H
HITCH Front hitch ......................................................................... H.10.B
HITCH Rear hitch......................................................................... H.10.C
HITCH Electronic draft control............................................................ H.10.D
87727132B 13/04/2010

INTRODUCTION
87727132B 13/04/2010
1

INTRODUCTION
Foreword
Technical Information
This manual has been produced by a new technical information system. This new system is designed to deliver
technical information electronically through CD-ROM and in paper manuals. A coding system called ICE has been
developed to link the technical information to other Product Support functions e.g. Warranty.
Technical information is written to support the maintenance and service of the functions or systems on a customers
machine. When a customer has a concern on his machine it is usually because a function or system on his machine
is not working at all, is not working efficiently, or is not responding correctly to his commands. When you refer to the
technical information in this manual to resolve that customers concern, you will find all the information classified using
the new ICE coding, according to the functions or systems on that machine. Once you have located the technical
information for that function or system then you will find all the mechanical, electrical or hydraulic devices, compo-
nents, assemblies and sub assemblies for that function or system. You will also find all the types of information that
have been written for that function or system, the technical data (specifications), the functional data (how it works),
the diagnostic data (fault codes and troubleshooting) and the service data (remove, install adjust, etc.).
By integrating this new ICE coding into technical information , you will be able to search and retrieve just the right
piece of technical information you need to resolve that customers concern on his machine. This is made possible by
attaching 3 categories to each piece of technical information during the authoring process.
The first category is the Location, the second category is the Information Type and the third category is the Product:
• LOCATION - is the component or function on the machine, that the piece of technical information is going to
describe e.g. Fuel tank.
• INFORMATION TYPE - is the piece of technical information that has been written for a particular component or
function on the machine e.g. Capacity would be a type of Technical Data that would describe the amount of fuel
held by the Fuel tank.
• PRODUCT - is the model that the piece of technical information is written for.
Every piece of technical information will have those 3 categories attached to it. You will be able to use any combination
of those categories to find the right piece of technical information you need to resolve that customers concern on his
machine.
That information could be:
• the description of how to remove the cylinder head
• a table of specifications for a hydraulic pump
• a fault code
• a troubleshooting table
• a special tool
87727132B 13/04/2010
3

INTRODUCTION
How to Use this Manual
This manual is divided into Sections. Each Section is then divided into Chapters. Contents pages are included at the
beginning of the manual, then inside every Section and inside every Chapter. An alphabetical Index is included at the
end of a Chapter. Page number references are included for every piece of technical information listed in the Chapter
Contents or Chapter Index.
Each Chapter is divided into four Information types:
• Technical Data (specifications) for all the mechanical, electrical or hydraulic devices, components and, assemblies.
• Functional Data (how it works) for all the mechanical, electrical or hydraulic devices, components and assemblies.
• Diagnostic Data (fault codes, electrical and hydraulic troubleshooting) for all the mechanical, electrical or hydraulic
devices, components and assemblies.
• Service data (remove disassembly, assemble, install) for all the mechanical, electrical or hydraulic devices, com-
ponents and assemblies.
Sections
Sections are grouped according to the main functions or a systems on the machine. Each Section is identified by
a letter A, B, C etc. The amount of Sections included in the manual will depend on the type and function of the
machine that the manual is written for. Each Section has a Contents page listed in alphabetic/numeric order. This
table illustrates which Sections could be included in a manual for a particular product.
SECTION
A - Distribution Systems
B - Power Production
C - Power Train
D - Travelling
E - Body and Structure
F - Frame Positioning
G - Tool Positioning
H - Working Arm
J - Tools and Couplers
K - Crop Processing
L - Field Processing
PRODUCT
Tractors X X X X X X X X
Vehicles with working arms: backhoes,
excavators, skid steers, .....
X X X X X X X X X
Combines, forage harvesters, balers, .... X X X X X X X X X X
Seeding, planting, floating, spraying
equipment, ....
X X X X X X X X X
Mounted equipment and tools, ..... X X X X
87727132B 13/04/2010
4

INTRODUCTION
This manual contains these Sections. The contents of each Section are explained over the following pages.
Contents
INTRODUCTION
DISTRIBUTION SYSTEMS A
POWER PRODUCTION B
POWER TRAIN C
TRAVELLING D
BODY AND STRUCTURE E
TOOL POSITIONING G
CROP PROCESSING K
Section Contents
SECTION A, DISTRIBUTION SYSTEMS
This Section covers the main systems that interact with most of the functions of the product. It includes the central
parts of the hydraulic, electrical, electronic, pneumatic, lighting and grease lubrication systems. The components that
are dedicated to a specific function are listed in the Chapter where all the technical information for that function is
included.
SECTION B, POWER PRODUCTION
This Section covers all the functions related to the production of power to move the machine and to drive various
devices.
SECTION C, POWER TRAIN
This Section covers all the functions related to the transmission of power from the engine to the axles and to internal
or external devices and additional Process Drive functions.
SECTION D, TRAVELLING
This Section covers all the functions related to moving the machine, including tracks, wheels, steering and braking. It
covers all the axles both driven axles and non-driven axles, including any axle suspension.
SECTION E, BODY AND STRUCTURE
This Section covers all the main functions and systems related to the structure and body of the machine. Including
the frame, the shields, the operator’s cab and the platform.
SECTION G, TOOL POSITIONING
This Section covers all the functions related to the final and/or automatic positioning of the tool once the tool is posi-
tioned using the Working Arm or the machine frame.
SECTION K, CROP PROCESSING
This Section covers all the functions related to crop processing.
87727132B 13/04/2010
5

SERVICE MANUAL
HYDRAULIC - PNEUMATIC - ELECTRICAL - ELECTRONIC SYSTEMS
PUMA 115 , PUMA 125 Multicontroller , PUMA 125 , PUMA 140 Multicontroller
, PUMA 140 , PUMA 155 Multicontroller , PUMA 155
87727132B 13/04/2010
A

HYDRAULIC - PNEUMATIC - ELECTRICAL - ELECTRONIC SYSTEMS - PRIMARY HYDRAULIC POWER
SYSTEM
PRIMARY HYDRAULIC POWER SYSTEM - Torque
BRJ4969C 1
PRIMARY HYDRAULIC POWER SYSTEM - Special tools
DESCRIPTION PART NUMBER
Tee adaptor 11/16 ORFS female x
11/16 ORFS male x 7/16 UNF female
380000570*
Tee adaptor 7/16 JIC female x 7/16
JIC male x 7/16 UNF female
380000571*
Adaptor M10 banjo x 7/16 UNF
female
380000572*
Tee adaptor 9/16 ORFS female x
9/16 ORFS male x 7/16 UNF female
380000573*
Blanking Cap 9/16 ORFS 380000574*
Adaptor 7/16 UNF female x 1/2 BSP
male
380000576*
Adaptor 7/16 UNF female x M12 x
1.5p male
380000577*
Adaptor 7/16 UNF female x M14 x
1.5p male
380000578*
Adaptor M14 banjo x M14 x 1.5p
female
380000579*
Tee adaptor 7/16 UNF female x 1/4
BSP hose tail x 1/2 hose
380000580*
7/16 UNF male Quick release adaptor 380000492*
Adaptor M10 x 1.0p x 7/16 UNF
female
380000493*
Tee adaptor 1” ORFS female x 1”
ORFS male x 7/16 UNF female
380000517
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A.10.A / 4

SYSTEM
Pressure Gauge 0–10 bar 380000551#
Pressure Gauge 0–40 bar (5 off) 380000552#
Pressure Gauge 0–250 bar 380000553#
Remote valve coupling 380000554#
Quick release adaptor 380000543
Pressure gauge hose 380000545#
1/8 NPT fitting to attach hose 292246
to gauge
380000544#
Adaptor M10 x 1.0p x 7/16 JIC male
(enables use of gauges with 7/16 JIC
hoses if used)
380000494
diagnostic switch 380000488
Bypass connector 380000561
Trailer brake fitting 380000550#
Flow Meter 120 ltr/min minimum
(procure locally)
* Part of hydraulic adaptor kit
380000464
# Part of hydraulic pressure test kit
380000240
Remote Valve check valve removal
tool
380002720
Charge pump pressure test adaptor 380200015
Lift ram pressure test tee piece 13/16
ORFS
380200012
Oil cooler pressure test adaptor 380200006
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A.10.A / 5

SYSTEM
Hydraulic pump Variable displacement pump - Torque
Refer to PRIMARY HYDRAULIC POWER SYSTEM - Torque (A.10.A)
Hydraulic pump Variable displacement pump - General specification
Type Variable Displacement Closed Centre
Load Sensing Piston Pump
Maximum Flow @ engine rated speed 113 l/min (29.85 US gpm)
Minimum Output @ 2200 ERPM (new pump) 95 - 105 Ltr/min@ One Remote Valve
.25.1 - 27.7 US gal/min.
Minimum Output @ 2200 ERPM (new pump) 110 - 113 Ltr/min
.29 - 29.8 US gal/min.
Charge Pressure (piston pump in standby) 6 - 8 bar
.( 87 - 116 lbf/in²)
Low Standby Pressure 25 - 27 bar (362.500 - 391.500 psi)
High Standby (maximum system) Pressure 210 bar (3045.00 psi)
Regulated Low Pressure 18 bar (261.00 psi).
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SYSTEM
Charge pump - General specification
Charge Pump ( 106 Ltr/Min )
Type Gear Type Pump
Charge Pressure Filter Dump Valve Crack open @ 6.9 bar ( 100 lbf/in2)
Fully Open @ 12.4 bar ( 180 lbf/in2)
Charge Pressure Minimum 1.6 - 3.4 bar ( 23 - 50
lbf/in2)
@ 2100 rev/min and variable flow
piston pump ‘On Load’
Charge Pressure Switch Close @ 0.55 - 0.82 bar ( 8 - 12
lbf/in2)
Making charge pressure warning light
flash
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A.10.A / 7

SYSTEM
PRIMARY HYDRAULIC POWER SYSTEM - Static description
The hydraulic systems can be separated into the following circuits :-
High Pressure Circuit
Hydraulic Lift Assembly.
Remote Control Valves.
Trailer Brake (Where Fitted)
Suspended Front Axle.
Front Lift (Where fitted).
Steering Circuit
Steering Motor and Cylinders
Low Pressure Circuit
Independent Power Take Off (PTO).
Differential Lock
Front Wheel Drive engagement
Transmission clutch and synchroniser engagement
Creeper engagement (Where fitted)
Front PTO (Where fitted)
50 kph engagement (Where fitted)
Lubrication Circuit
PTO Clutch Plates
Transmission Clutch Plates.
Transmission Shaft Pressure Lube
Pump Drive Gear Bearing.
Hydraulic Lift Cross Shaft
Options/Configurations
Hydraulic Pump/ HPL/ Remote Valve Options
Less Hydraulic Trailer Brakes With Hydraulic Trailer Brakes Hydraulic Trailer Brake Italy
Variable Displacement Pump.
EDC
Mechanical Remote
Valves
2 Non Configurable
2 Configurable
1 Non Configurable + 2 Configurable
2 Non Configurable + 2 Configurable
Electro-Hydraulic
Remote Valves
2, 3, or 4 Electro hydraulically operated valves
Transmission 18 X 6 40KM/H SEMIPOWERSHIFT
18 X 6 35KM/H SEMIPOWERSHIFT
18 X 6 40KM/H FULLPOWERSHIFT
Table 1
The high pressure circuit is of the ‘Closed Centre Load Sensing’ design on all tractor model options fed by a Variable
Displacement Pump.
Figure 1 shows the variable displacement pump and filter assembly.
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SYSTEM
BAIL07APH323ASA 1
Closed centre remote valves .
There are two types of remote valves available for the closed centre system. Standard fitting are the mechanical
remote valves operated via a cable from within the cab and optional are electro hydraulically operated valves, (1)
Figure 2, which are operated by electrical switches and have their own in built processor to control oil flow via a
solenoid valve.
BSE3604B 2
The hydraulic lift Electronic Draft Control valve (EDC valve) is a stack type proportional solenoid operated valve (1)
mounted with the remote control valves at the rear of the tractor. (Refer to HITCH Electronic draft control - Static
description (H.10.D))
BSE3604A 3
Tractors installed with the electronic draft control hydraulic lift assembly use a unique operator control panel.
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A.10.A / 9

SYSTEM
BSE2884A 4
(1). Draft sensitivity control knob (2). Drop rate control knob
(3). Height limit control knob (4). Slip limit control knob
BRL6436B 5
Puma Models from Serial No Z9BL40001 and Z9BL60001
(1). Wheel slip control knob (2). EHR Function control knob
(3).Front hitch height limit control knob (4). Drop rate control knob
(5). Draft sensitivity control knob (6). Rear hitch height limit control knob
BAIL06CCM153ASA 6
(1). Stop adjuster thumbwheel (2). Position control Knob
(3). Draft loading wheel (4). Raise/lower switch
The raise and lowering functions of the electronic draft control lift system can also be operated from the rear fender
switch (1)
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A.10.A / 10

SYSTEM
BRE1483B 7
The raise and lowering functions of the electronic draft control lift system can also be operated from the
rear fender switch (1)
BRK5798B 8
Puma Models from Serial No Z9BL40001 and Z9BL60001
The raise and lowering functions of the electronic draft control lift system can also be operated from the rear fender
switches (1) and (2)
BSE3774A 9
Mechanical remote control valves (1) are also available with electronic draft control. (2). Mechanical remotes are also
available with a combination configurable and non configurable valve slices . See Table 1
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A.10.A / 11

SYSTEM
BSF3967A_430 10
Located below the Electronic Draft Control valve (Where fitted), is the Hydraulic Power Tapping port (Power Beyond)
block.This includes a priority valve and also a low pressure regulating valve (1). This block also has a flange plate
which allows the addition of a trailer brake valve.
BSE3845A 11
1. Power Beyond Ports 2. Pressure Relief Valve
NOTE: Semi Powershift transmission tractors have two shift buttons plus an extra range button on the reverse side
of the handle.
CLOSED CENTRE LOAD SENSING HIGH PRESSURE HYDRAULIC CIRCUIT
The principal of operation of the closed centre load sensing high pressure hydraulic circuit with variable flow piston
pump is to supply oil flow on demand. It also enables simultaneous operation of the trailer brakes, hydraulic lift,
remote control valve assemblies and front axle suspension where fitted. The load sensing variable flow piston pump
offers significant benefits in reducing the engine power loss that occurs in open centre systems where a high volume
of oil, often far in excess of demand, is continuously pumped round the hydraulic circuit even when they are not being
operated.
A fixed displacement pump (Charge Pump) serves as an initial displacement pump for the variable displacement pump
. The variable displacement pump first of all supplies oil to the trailer brake valve (where fitted), the remote valves
and electronic draft control valve and a pilot oil supply with lower priority. The highest load pressure is indicated to
the flow and compensating valve on the pump via the load sensing line. The flow and compensator valve controls
the pump pressure in such a way that it always exceeds the highest load pressure by a pre-set difference. A priority
valve for low pressure circuit demand is located in the bottom subplate of the remote valve stack. Tractors fitted with
Electro-hydraulic remote valves also have high pressure oil supplied from the variable displacement pump to the top
plate of the remote valve stack. The oil passes through the top plate via a small filter and a pressure limiting valve (
20 - 22 Bar). The oil is then directed to the pilot oil supply of the electro-hydraulic control valve.
87727132B 13/04/2010
A.10.A / 12

SYSTEM
BAIL07APH330GSA 12
1. High Pressure Feed to Electro-Hydraulic Valve Pilot
Line
2. Electro-Hydraulic Remote Valves
3. Electronic Draft Control Valve 4. Trailer Brake Valve (Where Fitted)
5. Low Pressure Feed 6. Load Sensing Line
7. Lubrication Manifold 8. Low Pressure Feed to 50 km/h 19th Gear Clutch
Manifold
9. Variable Displacement Pump 10. Flow and Pressure Compensator Valve
11. High Pressure Feed to Electro-Hydraulic Remote
Valves
12. Return line from Hydraulic Lift Cylinder
13. Feed to trailer brake Coupler
The main filter (1) and the charge filter (2) Figure 13 are installed on tractors with variable displacement pump (CCLS
system).
1. Main Intake (Suction) Filter
2. Charge Filter
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SYSTEM
BAIS06CCM055AVA 13
Two valves are located within the filter assembly cap. These are (1) the 0.8 bar (11.600 psi) supplementary lube
valve and the 3 bar (43.500 psi) charge pressure bypass valve (2).
BRJ5174B 14
High Pressure Hydraulic System, Variable Displacement Pump (CCLS) - Electrical Switches
1. Low Charge Pressure Warning Switch
2. Intake Filter restriction (vacuum) Switch
3. Low Oil Temperature Switch
BAIL07APH325ASA 15
Mid-Mount Remote Valves.
Optional additional remote valves are mounted under the cab. Connected into the high pressure oil line supplied from
the hydraulic pump after the trailer brake valve and operated via a joystick control in the cab. (Refer to Mid-mount
remote control valve - Static description (A.10.C))
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A.10.A / 14

SYSTEM
BAIL06CCM088ASA 16
Suspended front axle control valve (where fitted)
The suspension control valve is located on the right hand side of the tractor. High pressure oil is fed from the power
beyond port on the sub plate of the remote valve stack and with the use of processor controlled PWM valves controls
the flow of oil to the suspension cylinder (Refer to SUSPENSION Hydraulic - Static description (D.40.C))
BAIL07APH357HSA 17
Front Axle Suspension Cylinder
BSE3769A 18
Steering Motor
All models use a fixed displacement motor. Also fitted as an option on some models is a Turn Assist valve (1) which
is coupled to the steering motor (2) .
87727132B 13/04/2010
A.10.A / 15

SYSTEM
BAIL07APH352ASA 19
Steering Cylinders.
Receives high pressure oil directly from the steering motor.
BSE2868B 20
Load Sensing Shuttle Valve.
Located in each remote valve slice, the Electronic Draft Control valve and between the trailer brake valve, front sus-
pension valve and mid-mounted valves, where fitted, is the load sensing shuttle valve (2) Figure 21. This allows the
function with the highest pressure demand to send sensing pressure to the load sensing valve, Figure 22, on the
variable displacement pump.
BSB0388A_436 21
1. Load Sensing Line
2. Pressure Compensator Valve
3. Flow Compensating Valve
4. Valve Body
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A.10.A / 16

SYSTEM
BAIL07APH326ASA 22
Operation of the closed centre high pressure hydraulic circuit is as follows:-
The components in the high pressure hydraulic circuit are connected by their load sensing lines to the hydraulic load
sensing valve which controls the output of the hydraulic pump.
When the trailer brakes, remote control valves, hydraulic lift or front axle suspension (where fitted) are operating, the
load sensing valve on variable flow piston pump, compares the pressure in the component load sense line with the
output pressure of the hydraulic pump.
If pump output pressure is less than the combined pressure of the load sense line and spring force of the flow con-
trol valve, then pump output continues to increase. When circuit demand is satisfied pump pressure overcomes the
combined pressure of the load sense line and flow compensating valve spring. This moves the spool in the flow com-
pensating valve to the right, allowing control pressure oil to be directed to the variable flow swash plate servo piston,
which de-strokes the pump to adjust output to circuit demand.
High Pressure oil is fed to a subplate at the bottom of the remote valve stack where it is directed to the Trailer Brake
valve which has priority for safety reasons. The oil is then redirected to the Electronic Draft Control Valve and the
Electro-Hydraulic Remote Valves. Within the subplate is a pressure compensating valve which diverts the oil to the
low pressure system at a pressure of 18 bar (261.00 psi).
High Pressure oil is also fed to the top of the Remote Valve stack through an end plate which incorporates a pressure
limiting valve and this supplies oil at 20 - 22 bar to the pilot line galleries in the Electro-Hydraulic Remote Valves.
Surplus oil from the charge pump to the variable displacement pump is fed past the 0.8 bar valve and boosts the
pressure in the lubrication circuit.
The trailer brake valve is located on the sub plate of the remote valve stack. The valve diverts oil pressure to the
trailer brakes whenever the brake pedals are depressed.
The trailer brake has absolute priority over other services in the circuit.
BAIL07APH327ASA 23
The remote valves are available as two, three or four valves per tractor.
The valves can be double-acting with float and kick out.
Double acting convertible to single-acting with float.
Double acting convertible to single-acting.
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SYSTEM
BSE3664A_442 24
BAIL07APH328ASA 25
When the oil is cold and pressure differential across the oil cooler is higher than 6 bar ( 87 lbf/in2) the cooler by-pass
valve (1) located in the transmission top cover will operate to ensure that adequate flow to the lubrication circuit is
maintained. This feature of diverting oil from the cooler assists in aiding a rapid warm up of oil in cold weather con-
ditions.
The steering pump / steering return oil is directed through the oil cooler at the front of the tractor and is limited to a
maximum pressure of 5.59 bar (81.06 psi)) by the lubrication relief valve located in the transmission top cover.
87727132B 13/04/2010
A.10.A / 18

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SYSTEM
Power beyond - Overview
BRL6472B 1
1.Load sensing port M14 2.Pressure port M22 x 1.5/15.5
3.Low pressure return port 3/4 BSP fitting 4.Return oil line M27 x 2/19
87727132B 13/04/2010
A.10.A / 19

SYSTEM
Hydraulic pump - Static description
The variable flow closed centre load sensing hydraulic pump assembly is mounted on the right hand side of the rear
axle centre housing and contains within its body two hydraulic pumps See Figure 1.
• A charge pump of the gear type to supply oil at a charge pressure of 3 bar ( 44 lbf/in2) to a variable flow closed
centre load sensing hydraulic piston pump.
• A variable flow closed centre load sensing piston type hydraulic pump supplying oil to the high pressure circuits
for operation of:-
Trailer Brake (Where fitted)
Hydraulic Lift Assembly
Remote Control Valves
Front Axle Suspension (Where fitted)
Front Lift (Where fitted)
Mid Mount remote valves (Where fitted)
Principal of Operation
Both pumping elements are driven by a ‘live’ drive gear train directly connected to the PTO clutch input drive shaft
and driven by the engine flywheel.
The operating principal of the fixed displacement gear pump is to provide a constant oil flow directly related to the
rotation speed of the pump.
The operating principal of a variable flow piston pump is to provide oil flow on demand and minimises the engine
power absorbed in driving the hydraulic pump when the hydraulic circuits do not require maximum pump flow.
The variable flow piston pump in hydraulic systems therefore has distinct power loss advantages over fixed displace-
ment gear type pumps, which continually provide oil flow and absorb engine power even when the hydraulic circuits
do not require the total pump output.
Variable Displacement Piston Pump (Refer to Hydraulic pump Variable displacement pump - Sectional view
(A.10.A))
The major components of the variable flow piston pump with closed centre load sensing are:-
• A nine element pumping head.
• A plate mechanism (swash plate) to adjust piston stroke and corresponding pump output.
• A load sensing valve which monitors the requirements of the hydraulic circuits and signals the pump to increase
or decrease hydraulic oil flow accordingly.
The nine element pumping head is cylindrical in shape and has nine barrels, into each of which, is installed a piston.
On the end of each piston is pressed a slipper which always remains in contact with the face of the swash plate located
at the front of the pumping head.
The drive shaft, which is driven by the pump drive gear, rotates the pumping head. As the pumping head rotates, the
pistons move in and out of their barrels, following the contour of the swash plate. For every revolution of the drive
shaft each piston completes one pumping cycle.
The swash plate, which does not rotate but pivots about the front of the pumping head, is the control mechanism that
limits the stroke of each piston and works in conjunction with the pressure and flow compensating valves in the load
sensing line.
As the pumping head rotates each barrel passes over the inlet and then the outlet ports of the pump. During the inlet
cycle for each piston and barrel, oil is pumped into the barrel pushing the piston forward so that it always remains in
contact with the swash plate. The stroke of each piston and volume of oil charged into its barrel is therefore dependent
on the angle of the swash plate.
After a piston and barrel has completed the inlet stroke, further rotation of the head aligns the barrel with the outlet
port. Oil within the barrel is then forcibly ejected by the piston through the exhaust port to the hydraulic circuits.
87727132B 13/04/2010
A.10.A / 20

SYSTEM
BAIL07APH329FSA 1
Variable Displacement Hydraulic Pump Installation
1 High Pressure Feed to Remote Valve Stack 2 Load Sensing Valve
3 Variable Displacement Pump 4 Intake Filter
5 Filter Restriction Switch 6 Low Oil Temperature Switch
7 Charge Pressure Filter 8 Charge Pump
9 Pressure Switch Manifold 10 Charge Pressure Switch
11 Brake Lubrication Hose 12 Pilot Feed to Electro Hydraulic Remotes (Where fitted)
The location of the principal components in the hydraulic pump assembly are identified above. These items are shown
on the hydraulic circuit diagrams which describe the operating modes of the pump. The principal function of the valves
and switches is as follows:-
Intake Filter and Restriction Switch (5)
Oil for both the charge and steering pump is drawn from the rear axle centre housing via the intake filter (4). The filter
incorporates a by-pass valve, which is an integral part of the replaceable filter and it is therefore essential that the
correct filter is installed at every filter change.
When the filter is blocked the oil filter restriction vacuum switch (5) is activated and illuminates the oil filter restriction
warning light on the instrument panel.
Because oil is more viscous (thicker) when cold and can falsely indicate that the filter requires servicing a low tem-
perature oil switch (6) is also used in the filter restriction circuit. This switch ensures that the warning light will not
operate if the oil temperature is less than 40 °C.
Charge Pump (8)
The charge pump ( Refer to Charge pump - Exploded view (A.10.A) supplies oil at a charge pressure of 3 bar ( 44
lbf/in2 to the variable flow closed centre load sensing pump.
Low Charge Pressure Switch (6)
87727132B 13/04/2010
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SYSTEM
The low charge pressure switch will cause a light to ‘Flash’ on the instrument cluster whenever the charge pressure
is less than 0.75 bar ( 11 lbf/in2)
Charge Pressure Filter Dump Valve (Refer to (14) Charge pump - Exploded view (A.10.A))
The charge pressure filter dump valve is a safety relief valve for relieving excess pressure on the charge pump should
the filter be restricted. This valve will start to operate if the charge pressure exceeds 6 bar ( 87 lbf/in2).
Charge Pressure Valve
The charge pressure valve diverts excess oil supplied by the charge pump and not required by the variable flow piston
pump to the inlet port of the steering and lubrication circuit pump.
This valve starts to operate at a pressure of 1 bar ( 14.5 lbf/in2) and when fully open limits the charge pressure circuit
oil to 3 bar ( 44 lbf/in2) .
Flow and Pressure Compensating Valves (Refer to Compensator - Exploded view (A.10.A))
Output from the variable flow piston pump is determined by adjusting the angle of the swash plate in the pump. The
flow compensating valve senses the circuit operating pressure and adjusts the swash plate angle to control pump
output.
If pump output and circuit pressure rises to 210 bar (3045.00 psi) the pressure compensating valve overrides the flow
compensating valve and adjusts the swash plate angle to limit maximum system pressure.
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SYSTEM
Hydraulic pump - Dynamic description
Refer to Figure 1.
The charge pressure pump draws oil through the charge pump inlet filter.
Oil drawn by the charge pump flows through the charge pressure filter to the variable flow piston pump and also
through the charge pressure valve to the inlet port of the steering pump.
Because output from the charge pump can exceed the combined demand of the steering and variable displacement
pumps an open gallery between the inlet side of the charge and steering pumps allows excess flow to the inlet side
of the steering pump to be returned to the inlet side port of the charge pump.
The variable flow closed centre load sensing hydraulic pump operates progressively in 5 modes:-
Generating Low Pressure Standby pressure
Low Pressure Standby
High Pressure Circuit Maximum Demand
High Pressure Circuit Low Demand
Maximum System Pressure
(High Pressure Standby)
A. Load Sensing Line from High pressure circuit components.
B. Return to Reservoir from flow and pressure compensating valves.
C. Gallery to Swash Plate servo piston from flow and compensating valves
D. System Pressure sensing gallery to flow and pressure compensating valves
E. System pressure supply to low pressure regulating valve
F. Regulated Low pressure oil supply
G. System pressure outlet from low pressure regulating valve
H. Low pressure regulating valve spool sensing gallery
87727132B 13/04/2010
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Case ih puma 155 tractor service repair manual

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Case ih puma 155 tractor service repair manual