Komatsu PW148-8 Wheeled Excavator Workshop Service Repair Manual PDF - MKMTSPW148.zip

This is a full workshop service and repair manual, complete with electrical wiring diagrams, for the Komatsu PW148-8 Wheeled Excavator. Inside, you'll find every technical detail needed to service, troubleshoot, fix, and rebuild the machine just like an expert mechanic would.

The Komatsu PW148-8 Wheeled Excavator workshop service and repair manual contains:

* Numbered table of contents easy to use so that you can find the information you need fast.

* Detailed sub-steps expand on repair procedure information

* Numbered instructions guide you through every repair procedure step by step.

* Troubleshooting and electrical service procedures are combined with detailed wiring diagrams for ease of use.

* Notes, cautions and warnings throughout each chapter pinpoint critical information.

* Bold figure number help you quickly match illustrations with instructions.

* Detailed illustrations, drawings and photos guide you through every procedure.

* Enlarged inset helps you identify and examine parts in detail.

PRODUCT DETAILS:

Total Pages: 1,158 pages

File Format: PDF (Internal Links, Bookmarked, Table of Contents, Searchable, Printable, high quality)

Language: English

VEBM720100 - Wheeled Excavator PW148-8 Shop Manual.pdf

MAIN SECTIONS

VEBM720100 PW148-8.....1

CONTENTS.....3

FOREWORD.....5

Safety.....5

Important safety notice.....5

General precautions.....5

Preparations for work.....5

Precautions during work.....6

General.....7

General.....7

Structure and function.....7

Testing, adjusting and troubleshooting.....7

Disassembly and assembly.....7

Maintenance standard.....7

How to read the shop manual.....8

Volumes.....8

Distribution and updating.....8

Filing method.....8

Revised edition mark.....8

Revisions.....8

Symbols.....8

Hoisting instructions.....9

Hoisting.....9

Wire Ropes.....9

Coating materials.....10

Standard tightening torque.....12

Standard tightening torque of bolts and nuts.....12

Tightening torque of hose nuts.....13

Tightening torque of split flange bolts.....13

Tightening torques for hoses (taper seal type and face seal type).....13

Tightening torque for 107 engine series (bolts and nuts).....14

Tightening torque for 107 engine series (eye joints).....14

Tightening torque for 107 engine series (tapered screws).....14

Electric wire code.....15

Classification by thickness.....15

Classification by color and code.....15

Conversion tables.....16

Method of using the conversion table.....16

Units.....22

GENERAL.....23

Specification dimension drawings.....24

Dimensions.....24

Working ranges.....26

Working range: 1 piece boom.....26

Working range: 2 piece boom.....27

Specifications.....29

Weight table.....31

1 piece boom.....32

2 piece boom.....33

Fuel, coolant and lubricants.....34

STRUCTURE AND FUNCTION.....35

KOMTRAX terminal system.....269

Service brake and suspension system.....264

Braking system.....264

Operation.....267

Steering system.....251

Operating principles.....251

Dynamic Steering.....251

2 - stage principle.....251

1. Condition 1.....252

2. Condition 2.....253

3. Condition 3.....254

4. Condition 4.....255

5. Condition 5.....256

6. Condition 6.....257

7. OLS priority valve.....258

8. Load sensing steering unit.....259

Travel system.....231

Travel circuit.....231

1. Travel motor.....232

2. Travel pedal.....241

3. Forward / Neutral / Reverse switch (F-N-R).....242

4. Forward / Reverse travel solenoid.....243

5. Travel / neutral solenoid.....244

6. Travel creep solenoid.....245

Operational and control features.....246

Operational and Control features (1).....246

Operational and Control features (2).....246

Operational and Control features (3).....247

7. 2-Stage relief solenoid.....248

8. Transmission clutch control valve.....250

1st attachment circuit hydraulic performance (main valve bypassed).....230

Sensor.....221

Coolant temperature sensor.....222

Oil pressure switch.....222

Rotation sensor.....223

Boost pressure and temperature sensor.....223

WIF (Water-In-Fuel detection) sensor.....224

Engine oil level sensor.....224

Coolant level sensor.....225

Coolant temperature sensor.....226

Hydraulic oil temperature sensor.....226

Fuel level sensor.....226

Air cleaner clogging sensor.....227

Overload Caution sensor.....227

Swing proximity sensor.....228

Travel PPC sensor.....228

PPC pressure sensor.....228

Park brake pressure sensor.....229

Brake accumulator low pressure sensor.....229

Brake stop light sensor.....229

Overload warning device.....220

Outline.....220

Function.....220

Structure.....220

Machine monitor system.....204

Monitor panel.....205

Outline.....205

Monitor control, display portion.....208

Monitor gauge displays.....212

Keypad layout.....217

Declaration of switch function on keypad.....218

Electrical control system.....181

Machine control system diagram.....182

1. Engine and pump control function.....183

Function.....184

Function.....188

Function.....190

Function.....192

Operation.....193

Function.....194

Function.....196

Function.....198

Function.....201

Specifications.....202

Function.....202

Function.....203

Operation.....203

Electrical system.....174

Engine control.....174

1. Operation of System.....174

2. Component.....175

Engine controller.....176

Pump controller.....178

Electrical wiring diagramm.....173

Air conditioner.....172

Air conditioner piping.....172

Work equipment.....166

Work equipment.....167

1. Dimension of arm.....168

2. Dimension of bucket.....170

Dozer cylinder.....164

Function.....165

Outrigger cylinder.....162

Function.....163

Hydraulic cylinder.....160

Boom cylinder.....160

Arm cylinder.....160

Bucket cylinder.....160

Adjust cylinder.....161

Boom safety valve.....158

Operation.....159

Solenoid valve block.....146

ON / OFF Solenoid valves (3 way valve).....148

Operation.....148

ON / OFF Solenoid valves (4 way valve).....150

Operation.....150

Hi/ Lo Solenoid valve (4 way valve).....152

Operation.....152

Attachment PPC valve.....154

Function.....155

Operation.....155

Work equipment - Swing PPC valve.....142

Operation.....144

Travel PPC pedal.....140

Centre swivel joint.....139

CLSS.....117

Outline of CLSS.....117

Features.....117

Structure.....117

Basic Principle.....118

Operation for each function and valve.....120

Hydraulic circuit diagram and name of valves.....120

1. Unload valve.....122

Function.....122

Operation.....122

Operation.....123

Operation.....124

2. Introduction of LS pressure.....125

Work equipment valve.....125

Function.....125

Operation.....125

3. LS bypass plug.....126

Outline.....126

Operation.....126

4. Pressure compensation valve.....128

Function.....128

Operation.....129

5. Area ratio of pressure compensation valve.....130

Function.....130

6. Boom regeneration circuit.....132

Function.....132

Operation.....132

Function.....133

Operation.....133

7. Arm regeneration circuit.....134

Function.....134

Operation.....134

Function.....135

Operation.....135

8. Swing bleeding valve.....136

Function.....136

Operation (In fine control operation).....136

9. Variable type pressure compensation valve (for service).....137

Function.....137

Simultaneous operation with work equipment under heavy load (boom RAISE, etc.).....137

10. LS select valve.....138

Function.....138

Operation.....138

Control valve.....106

Outline.....106

Pilot pressure control (PPC) system.....104

Function.....105

Operation.....105

Hydraulic pump.....81

Function.....83

Structure.....83

Operation.....84

LS valve.....86

PC valve.....87

Function.....88

Operation.....90

1. LS valve.....90

2. PC valve.....94

LS(PC)-EPC valve.....101

Function.....102

Operation.....102

Hydraulic tank.....79

Specifications.....80

Hydraulic circuit diagram.....78

Hydraulic equipment layout drawings.....76

Orbitrol valve.....75

Specifications.....75

Structure and function.....75

Steering column.....74

Steering system.....73

Structure and function.....73

Accumulator for brake valve.....72

Specifications.....72

Structure ans function.....72

Power brake valve.....70

Specifications.....71

Function.....71

Priority valve.....69

Specification.....69

Function.....69

Brake/steer pump.....68

Specifications.....68

Function.....68

Braking system.....66

Structure and function.....67

Suspension lock cylinder.....64

Specifications.....64

Structure and function.....64

Circuit.....65

Axle oscillation.....65

Axle.....60

Outline.....60

Clutch control circuit.....58

Function.....59

Travel motor.....54

Function.....55

Operation of travel motor.....56

ATT EPC valve assembly.....53

Shematic.....52

Quick coupler control valve.....51

Specification.....51

Operation.....51

Transmission.....48

Specifications.....48

Function.....49

Undercarriage.....46

Swing machinery & motor.....41

Specification.....42

Operation of swing lock.....43

Relief valve portion.....44

Operation.....44

Swing circle.....40

Specifications.....40

Power train.....38

Radiator, oil cooler, aftercooler and fuel cooler.....37

Engine related parts.....36

Outline.....36

TESTING AND ADJUSTING.....271