Komatsu WB140N WB150N WB140-2N WB150-2N Backhoe Loader Workshop Repair Service Manual PDF - MKMTSWB140NWB150N.zip

A full service and repair manual, complete with electrical wiring diagrams, covering the Komatsu Backhoe Loader models WB140-2N and WB150-2N — packed with every technical detail needed to service, troubleshoot, fix, and rebuild these machines the way professional technicians do.

Contained in the Komatsu Backhoe Loader WB140-2N and WB150-2N workshop service repair manual:

* 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.

CEBM009802 - Backhoe Loader WB140-2N, WB150-2N Shop Manual.pdf

CEBM012701 - Backhoe Loader WB140-2N, WB150-2N Shop Manual.pdf

PRODUCT DETAILS:

Total Pages: 1,012 pages

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

Language: English

TABLE OF CONTENTS

CEBM009802 - Backhoe Loader WB140-2N, WB150-2N Shop Manual....1

COVER....1

CONTENTS....2

FOREWORD....11

SAFETY....11

SAFETY NOTICE....11

IMPORTANT SAFETY NOTICE....11

GENERAL PRECAUTIONS....11

PREPARATIONS FOR WORK....11

PRECAUTIONS DURING WORK....11

GENERAL....13

HOW TO READ THE SHOP MANUAL....14

VOLUMES....14

DISTRIBUTION AND UPDATING....14

FILING METHOD....14

REVISED EDITION MARK....14

REVISIONS....14

SYMBOLS....14

HOISTING INSTRUCTIONS....15

HOISTING....15

WIRE ROPES....15

COATING MATERIALS....16

STANDARD TIGHTENING TORQUE....18

STANDARD TIGHTENING TORQUE OF BOLTS AND NUTS....18

TIGHTENING TORQUE OF HOSE NUTS....19

TIGHTENING TORQUE OF SPLIT FLANGE BOLTS....19

TIGHTENING TORQUE FOR FLARED NUTS....19

ELECTRIC WIRE CODE....20

CLASSIFICATION BY THICKNESS....20

CLASSIFICATION BY COLOR AND CODE....20

CONVERSION TABLES....21

METHOD OF USING THE CONVERSION TABLE....21

10 STRUCTURE AND FUNCTION....27

POWER TRAIN....29

DESCRIPTION....29

TRANSMISSION....31

DIAGRAM OF THE POWER TRAIN....31

HYDRAULIC CONVERTOR-TRANSMISSION CIRCUIT DIAGRAM....32

DRIVE SHAFTS....41

FORWARD AND REVERSE....41

DRIVEN GEAR....41

4WD DRIVEN....42

CONTROL VALVE BLOCK....43

FRONT AXLE....44

DIFFERENTIAL....44

FINAL REDUCTION - JOINT....46

STEERING CYLINDER....48

REAR AXLE....50

DIFFERENTIAL....50

FINAL REDUCTION....52

BRAKES....54

HYDRAULIC PUMP....57

FUNCTION....62

STRUCTURE....62

OPERATION....63

PUMP OPERATION....63

CONTROL OF DELIVERY....64

PC VALVE, LS VALVE, SERVO PISTON....65

LS VALVE....66

PC VALVE....72

WORKING MODE SOLENOID VALVE....77

FUNCTION....77

OPERATION....77

STEERING UNIT....79

TECHNICAL DATA....79

OPERATION....79

HYDRAULIC CIRCUIT....80

SHOVEL CONTROL VALVE....81

2 SPOOL....81

3 SPOOL....85

BACKHOE CONTROL VALVE....89

6 SPOOL....89

7 SPOOL....94

FOR TELESCOPIC ARM....94

FOR HAMMER....94

8 SPOOL....97

FOR HAMMER AND TELESCOPE ARM....97

CLSS (CLOSED CENTER LOAD SENSING SYSTEM....98

CHARACTERISTICS....98

STRUCTURE....98

OPERATION....99

UNLOADING VALVE....101

FUNCTION....101

OPERATION....101

INTRODUCTION OF THE LS PRESSURE....104

OPERATION....104

DELIVERY COMPENSATION....105

INTRODUCTION....105

FUNCTION....105

OPERATION....105

LIFD CONTROL SYSTEM....108

FUNCTION....108

OPERATION....108

LS DECOMPRESSION VALVE....109

DESCRIPTION....109

OPERATION....109

PRESSURE CUT-OFF VALVE....110

DESCRIPTION....110

OPERATION....110

PRIORITY VALVE (ONLY FOR THE 2-3 SPOOL CONTROL VALVE)....111

FUNCTION....111

SOLENOID VALVE....112

SOLENOID VALVE BLOCK ST1 - DIFFERENTIAL LOCKING - BACKHOE BOOM LOCKING...112

SAFETY VALVE....113

BRAKE PUMP....115

SHOVEL CYLINDERS....117

RAISE CYLINDER....117

DUMP CYLINDER....117

BACKHOE CYLINDERS....119

BOOM....119

ARM....119

BUCKET....120

OUTRIGGERS....120

BOOM SWING....121

TELESCOPIC ARM....121

CHARACTERISTICS....122

FRONT WORKING EQUIPMENT....124

SWING BRACKET....126

BACKHOE WORKING EQUIPMENT....127

AIR CONDITIONING UNIT....129

FUNCTION....130

20 TESTING, ADJUSTING AND TROUBLESHOOTING....131

STANDARD VALUE TABLES FOR ENGINE....133

STANDARD VALUE TABLE FOR CHASSIS....135

SPECIAL TOOLS....161

ENGINE SPEED....162

VALVE CLEARANCE....163

COMPRESSION PRESSURE....164

FUEL INJECTION TIMING....165

FAN AND ALTERNATOR DRIVE BELT....167

TENSION CHECK....167

TENSION ADJUSTMENT....167

COMPRESSOR DRIVE BELT....168

CHECKING TENSION....168

TENSION ADJUSTMENT....168

ACCELERATOR PEDAL AND LEVER TRAVEL....169

ACCELERATOR PEDAL TRAVEL ADJUSTMENT....169

ACCELERATOR LEVER TRAVEL ADJUSTMENT....170

BRAKE PEDAL TRAVEL AND MICROSWITCHES....171

MASTER CYLINDER ROD ADJUSTMENT....171

MICROSWITCHES ADJUSTMENT....171

CHECKING ADJUSTMENT....171

BLEEDING AIR....172

BLEEDING AIR FROM PUMP....172

BLEEDING AIR FROM CYLINDERS....172

BLEEDING AIR FROM OIL TANK....173

HYDRAULIC OIL TANK PRESSURIZATION....173

RELEASING RESIDUAL PRESSURE FROM THE CIRCUITS....173

BLEEDING AIR FROM THE BRAKING CIRCUIT....173

CHECKING AIR BLEEDING FROM BRAKING CIRCUIT....174

ATTACHMENTS HYDRAULIC CIRCUIT....175

INTRODUCTION....175

TESTING AND SETTING GENERAL VALVES....178

FRONT SHOVEL CONTROL VALVE (2-3 SPOOLS)....178

BACKHOE CONTROL VALVE (6-7-8 SPOOLS)....178

TESTING SECONDARY VALVES....178

SETTING MAIN AND SECONDARY VALVES....180

MAIN RELIEF VALVES....180

SECONDARY VALVES....181

LOAD SENSING SIGNAL (LS VALVE)....182

LOAD SENSING VALVE ADJUSTMENT....182

UNLOADING VALVE....183

UNLOADING VALVE ADJUSTMENT....183

UNLOADING VALVE FUNCTION....184

PRIORITY VALVE....185

TESTING PRIORITY VALVE OPERATION....185

CLEANING PRIORITY VALVE....185

STEERING CONTROL SYSTEM PRESSURE....186

TESTING....186

SETTING....186

BRAKE SYSTEM....187

TESTING CIRCUIT AND BRAKE PUMP TIGHTNESS....187

TESTING BRAKING GROUP LEAK TIGHTNESS....187

ENGINE SPEED UNDER LOAD....189

PREPARING THE MACHINE....189

TESTING WITH THE TORQUE CONVERTER UNDER STRESS....190

TESTING THE TORQUE CONVERTER AND HYDRAULIC SYSTEM UNDER STRESS....190

POWER TRAIN GROUP....191

PREPARING THE MACHINE....191

CONVERTER OIL PRESSURE....191

CLUTCH ENGAGEMENT PRESSURE....192

POWER TRAIN CLUTCHES....193

PREPARATION OF THE MACHINE....193

TESTING....193

SENSOR FOR RETURN TO DIG DEVICE....194

CAUSES OF HYDRAULIC DRIFT....195

FRONT EQUIPMENT....195

TESTING OF FRONT BUCKET LIFTING....195

TESTING OF FRONT BUCKET DUMPING....196

BACKHOE....197

BOOM TESTING....197

ARM TESTING....197

BUCKET TESTING....198

OUTRIGGER TESTING....199

AIR CONDITIONING UNIT....200

TESTING THE WORKING TEMPERATURE....200

CHECKING THE UNIT....201

EMPTYING THE AIR CONDITIONING UNIT....201

FRONT AXLE....203

REAR AXLE....208

TRANSMISSION....213

30 DISASSEMBLY AND ASSEMBLY....217

METHOD OF USING THIS MANUAL....222

REMOVAL OR INSTALLATION OF PARTS OR ASSEMBLIES....222

PRECAUTIONS DURING SERVICE OR REPAIR OPERATIONS....222

REMOVAL PRECAUTIONS....223

INSTALLATION PRECAUTIONS....223

SPECIAL TOOLS....224

ENGINE COMPONENTS....227

CYLINDER HEAD ASSEMBLY....227

CRANKSHAFT DAMPER AND PULLEY ASSEMBLY....227

ENGINE OIL COOLER ASSEMBLY....227

ENGINE OIL PUMP ASSEMBLY....227

FUEL INJECTION PUMP ASSEMBLY....227

FUEL INJECTOR ASSEMBLY....227

FRONT AND REAR ENGINE OIL SEAL ASSEMBLY....227

GOVERNOR ASSEMBLY....227

THERMOSTAT ASSEMBLY....227

TURBOCHARGER ASSEMBLY....227

WATER PUMP ASSEMBLY....227

FRONT END LOADER CYLINDER LOCK....228

LOCKING PROCEDURES....228

STARTER, ALTERNATOR AND COMPRESSOR....229

STARTER MOTOR....229

REMOVAL....229

INSTALLATION....229

ALTERNATOR....230

REMOVAL....230

INSTALLATION....231

REFRIGERANT COMPRESSOR....232

REMOVAL....232

INSTALLATION....233

BATTERY DISCONNECT SWITCH....234

REMOVAL....234

INSTALLATION....234

FRONT COUNTERWEIGHT....235

REMOVAL....235

INSTALLATION....235

RADIATOR, CONDENSER AND OIL COOLERS....236

RADIATOR....236

REMOVAL....236

INSTALLATION....238

REFRIGERANT CONDENSER....239

REMOVAL....239

INSTALLATION....239

HYDRAULIC OIL COOLER....240

REMOVAL....240

INSTALLATION....240

TRANSMISSION OIL COOLER....241

REMOVAL....241

INSTALLATION....241

MUFFLER AND EXHAUST STACK....242

MUFFLER....242

REMOVAL....242

INSTALLATION....242

EXHAUST STACK....243

REMOVAL....243

INSTALLATION....243

ENGINE HOOD AND OPERATORS CAB....244

ENGINE HOOD....244

REMOVAL....244

INSTALLATION....245

OPERATORS CAB....246

REMOVAL....246

INSTALLATION....250

AIR CONDITIONING AND HEATER....252

REMOVAL....252

INSTALLATION....253

FUEL AND HYDRAULIC OIL TANKS....254

FUEL TANK....254

REMOVAL....254

INSTALLATION....255

HYDRAULIC TANK....256

REMOVAL....256

INSTALLATION....257

ENGINE AND TRANSMISSION....258

REMOVAL....258

INSTALLATION....263

PISTON PUMP....264

REMOVAL....264

INSTALLATION....265

TRANSMISSION....266

REMOVAL....266