Bobcat 742B 743B Loader Service Manual 6720772 (6-12) – PDF DOWNLOAD
FILE DETAILS:
Bobcat 742B 743B Loader Service Manual 6720772 (6-12) – PDF DOWNLOAD
Language : English
Pages : 296
Downloadable : Yes
File Type : PDF
TABLE OF CONTENTS:
Bobcat 742B 743B Loader Service Manual 6720772 (6-12) – PDF DOWNLOAD
MAINTENANCE SAFETY 3
CONTENTS 5
FOREWORD 7
SAFETY INSTRUCTIONS 9
SERIAL NUMBER LOCATIONS 11
LOADER SERIAL NUMBER 11
ENGINE SERIAL NUMBER (743B) 11
ENGINE SERIAL NUMBER (742B) 11
DELIVERY REPORT 11
BOBCAT SKID STEER LOADER IDENTIFICATION 12
PREVENTIVE MAINTENANCE 13
SERVICE SCHEDULE 15
LIFTING AND BLOCKING THE LOADER 16
Procedure 16
PARKING THE BOBCAT LOADER 17
Procedure 17
TRANSPORTING THE BOBCAT LOADER 17
LIFT ARM SUPPORT DEVICE 18
To Engage Lift Arm Support Device 18
To Disengage Lift Arm Support Device 18
OPERATOR CAB 19
Raising The Operator Cab 19
Lowering The Operator Cab 19
SEAT BAR RESTRAINT SYSTEM 20
Description 20
Seat Bar Inspection 20
Seat Bar Maintenance 20
AIR CLEANER SERVICE (743B) 21
Replacement Of The Filter Element 21
AIR CLEANER SERVICE (742B) 23
Replacement Of The Filter Element 23
FUEL SYSTEM (743B) 24
Fuel Specifications 24
Filling The Fuel Tank 24
Fuel Filter 24
Removing Air From The Fuel System 25
FUEL SYSTEM (742B) 26
Fuel Specifications 26
Filling The Fuel Tank 26
Fuel Filter 26
ENGINE LUBRICATION SYSTEM (743B) 27
Checking Engine Oil 27
Replacing Oil And Filter 27
ENGINE LUBRICATION SYSTEM (742B) 29
Checking Engine Oil 29
Replacement Of Oil And Filter 29
ENGINE COOLING SYSTEM (743B) 30
Coolant Level 30
Cleaning The Cooling System 30
Removing Coolant From The Cooling System 30
ENGINE COOLING SYSTEM (742B) 32
Coolant Level 32
Cleaning The Cooling System 32
Removing Coolant From The Cooling System 32
ALTERNATOR BELT ADJUSTMENT (743B) 33
Adjusting The Alternator Belt 33
ALTERNATOR BELT ADJUSTMENT (742B) 34
Adjusting The Alternator Belt 34
GOVERNOR (742B) 35
Governor Belt Adjustment 35
Governor Adjustment 35
Governor Oil Level 35
USING A BOOSTER BATTERY (Jump Starting) 36
Procedure 36
HYDRAULIC/HYDROSTATIC SYSTEM 37
Checking And Adding Fluid 37
Hydraulic/Hydrostatic Filter Replacement 38
Removing The Hydraulic Fluid 38
SPARK ARRESTOR MUFFLER 39
Cleaning Procedure 39
TIRE MAINTENANCE 40
Wheel Nuts 40
Tire Rotation 40
Tire Mounting 40
FINAL DRIVE TRANSMISSION (CHAINCASE) 41
Checking And Adding Oil 41
LUBRICATING THE BOBCAT LOADER 42
Procedure 42
U–JOINT LUBRICATION 44
Procedure 44
REMOTE START SWITCH 44
Procedure 44
HYDRAULIC SYSTEM 45
HYDRAULIC / HYDROSTATIC SCHEMATICS 47
TROUBLESHOOTING 53
HYDRAULIC SYSTEM INFORMATION 54
Flare Connections 54
O–Ring Face Seal Connection 54
Straight Thread O–ring Fitting 54
Tubelines And Hoses 54
LIFT CYLINDER 55
Checking The Lift Cylinder(s) 55
Removal And Installation 55
TILT CYLINDER 57
Checking The Tilt Cylinder 57
Removal And Installation 57
HYDRAULIC CONTROL VALVE 59
Checking The Main Relief Valve W/Auxiliary Couplers (Opt ) 59
Checking The Main Relief Valve W/O Auxiliaries 60
Main Relief Valve Removal And Installation 61
Adjusting The Main Relief Valve 61
Removal And Installation 62
HYDRAULIC PUMP 64
Checking The Output Of The Hydraulic Pump 64
Removal And Installation 65
PORT BLOCK 66
Removal And Installation 66
Cold Weather By–Pass Valve 67
Case Drain Relief Valve 68
HYDRAULIC FLUID RESERVOIR 69
Removal And Installation 69
HYDRAULIC CONTROL PEDALS 70
Removal And Installation 70
Adjustment 70
PEDAL INTERLOCK LINKAGE 71
Installation 71
Adjustment 71
HYDRAULIC FLUID FILTER HOUSING 72
Removal And Installation 72
HYDROSTATIC SYSTEM 73
TROUBLESHOOTING 75
HYDROSTATIC SYSTEM INFORMATION 76
High Pressure Relief/Replenishing Valve Function 76
FRONT PANEL 77
Removal And Installation 77
STEERING LEVERS 79
Removal And Installation 79
Repairing The Steering Levers 80
STEERING LINKAGE 81
Steering Linkage Adjustment 81
Removal And Installation 82
Repairing The Pintle Lever 83
HYDROSTATIC MOTOR 84
Removal And Installation 84
HYDROSTATIC PUMP 86
Checking Charge Pressure 86
Charge Pressure Relief Valve 86
Checking High Pressure Relief Valves 87
Removal And Installation 88
Hydrostatic Pump Rear Mount 91
High Pressure Hose Routing 91
Tow Valves 91
DRIVE SYSTEM 93
PARKING BRAKE 95
Adjustment 95
Removal And Installation 96
Brake Block And Pads 98
Brake Disc Removal And Installation 100
Rear Transmission Cover Installation 100
MOTOR CARRIER 101
Shaft Seal Replacement 101
Removal And Installation (Later Models) 103
Disassembly And Assembly (Later Models) 104
Disassembly And Assembly (Early Models) 104
AXLE SEAL 105
Removal And Installation 105
AXLE, SPROCKET AND BEARINGS 108
Removal And Installation 108
DRIVE CHAIN 112
Removal And Installation 112
CHAINCASE FLUID 113
Replacing The Chaincase Fluid 113
MAIN FRAME 115
OPERATOR CAB 117
Removal And Installation 117
OPERATOR CAB GAS CYLINDER 120
Removal And Installation 120
REAR DOOR 121
Door Latch Adjustment 121
Removal And Installation 122
REAR GRILL 123
Removal And Installation 123
BOB–TACH 124
Removal And Installation 124
Bob–Tach Lever And Wedge 127
LIFT ARMS 129
Removal And Installation 129
FUEL TANK 131
Removal And Installation 131
Fuel Tank Sender Switch 132
ELECTRICAL SYSTEM 133
ELECTRICAL SCHEMATICS 136
ELECTRICAL SYSTEM INFORMATION 143
TROUBLESHOOTING 143
BATTERY 144
Checking The Battery 144
Removal And Installation 144
ALTERNATOR BELT SHIELD (743B) 145
Removal And Installation 145
ALTERNATOR 146
Checking The Alternator Output (Old Style) 146
Checking The Alternator Regulator (Old Style) 147
Alternator Output Test (New Style) 148
Rectifier (Diode) Test (New Style) 148
Alternator Regulator Test (New Style) 149
Removal And Installation (743B) 150
Removal And Installation (742B) 150
Disassembly And Assembly (Old Style) 151
Disassembly and Assembly (New Style) 154
Stator Continuity Test 154
Stator Ground Test 154
Rotor Continuity Test 155
Rotor Ground Test 155
Rectifier Continuity (Diode) Test 155
Rectifier Continuity (Diode) Test (New Style) 156
STARTER 157
Checking The Starter 157
Removal And Installation (743B) 157
Removal And Installation (742B) 158
Parts Identification 159
Disassembly And Assembly 160
Replacing The Brushes 161
Cleaning and Inspection 162
ENGINE SERVICE 163
ENGINE SERVICE (Kubota 743B) 165
TROUBLESHOOTING 167
FUEL FILTER 168
Replacing The Fuel Filter 168
Removing Air From The Fuel System 168
GLOW PLUGS 168
Checking 168
ENGINE COMPRESSION 169
Checking 169
FUEL INJECTION PUMP 169
Removal and Installation 169
Timing The Injection Pump 170
Checking The Injection Pump 171
FUEL INJECTOR NOZZLES 172
Removal And Installation 172
Checking the Nozzles 173
ENGINE 174
Removal And Installation 174
RADIATOR AND OIL COOLER 176
Removal And Installation 176
BLOWER HOUSING 177
Removal And Installation 177
ENGINE FLYWHEEL AND U–JOINT 178
Removal And Installation 178
Flywheel Ring Gear 178
MUFFLER 179
Removal And Installation 179
CYLINDER HEAD 180
Removal 180
Disassembly 181
Servicing 181
Valve Guide Installation 183
Assembly 185
Installation 185
ENGINE REPAIR 186
Gearcase Removal 186
Timing Gear, Camshaft And Oil Pump Removal 188
Pistons And Crankshaft Removal 189
Timing Gear And Camshaft Service 191
Servicing The Connecting Rods And Pistons 192
Crankshaft Service 194
Cylinder Liner Service 195
Lubrication System 196
Oil Pump Service 197
Water Pump Service 197
ENGINE ASSEMBLY 199
Crankshaft Installation 199
Installing The Pistons 199
Installing The Camshaft And Timing Gears 199
Gearcase Installation 201
ENGINE SERVICE (Mitsubishi 742B) 203
TROUBLESHOOTING 205
VALVE CLEARANCE 206
Adjustment 206
ENGINE COMPRESSION 207
Checking 207
IGNITION TIMING 208
Procedure 208
DISTRIBUTOR 209
Removal And Installation 209
Point Gap Adjustment 209
Disassembly And Assembly 210
Checking Centrifugal Advance 210
Checking Vacuum Advance 210
CARBURETOR 211
Description 211
Removal And Installation 214
Disassembly And Assembly 215
Adjustment 215
Governor Adjustment 216
FUEL PUMP 217
Removal And Installation 217
Inspection 217
Check The Fuel Pump 217
Fuel Filter 217
ENGINE BELT SHIELD 218
Removal And Installation 218
ENGINE 219
Removal And Installation 219
OIL COOLER AND BLOWER HOUSING 223
Removal And Installation 223
RADIATOR 226
Removal And Installation 226
ENGINE MUFFLER 227
Removal And Installation 227
ENGINE FLYWHEEL AND U–JOINT 228
Removal And Installation 228
Flywheel Ring Gear 228
ROCKER ARMS 229
Removal 229
Inspection 230
Installation 230
CAMSHAFT 233
Removal And Installation 233
Inspection 233
CYLINDER HEAD 234
Removal And Installation 234
Inspection 235
VALVES 236
Removal 236
Installation 236
Reconditioning The Valve And Valve Seat 237
Valve Seat Inserts 237
Valve Guide 238
Valve Spring 238
PISTON AND CONNECTING ROD 240
Removal 240
Disassembly 240
Inspection 241
Assembly 241
Installation 242
PISTON PIN 244
Assembly Of The Tool 244
Removal Of The Piston Pin 244
Installation Of The Piston Pin 245
CYLINDER LINERS 246
Checking 246
CRANKSHAFT AND MAIN BEARINGS 247
Description 247
Removal 247
Checking 247
Checking Oil Clearance (Plastic Gauge) 248
Installation 248
Crankshaft End Play 249
Rear Oil Seal 249
TIMING BELT 250
Adjustment 250
Removal 251
Inspection 252
Assembly 253
FRONT CASE AND OIL PAN 255
Removal And Installation 255
OIL PUMP 256
Removal 256
Inspection 256
Installation 256
Relief Valve 257
FRONT CASE SEAL 258
Removal And Installation 258
WATER PUMP 259
Removal And Installation 259
Inspection 259
THERMOSTAT 260
Removal And Installation 260
Inspection 260
SPECIFICATIONS 261
SPECIFICATIONS (743B) 263
SPECIFICATIONS 265
OPERATIONS & PERFORMANCE 265
ENGINE 265
HYDRAULIC SYSTEM 266
ELECTRICAL 266
DRIVE SYSTEM 266
CAPACITIES 266
TIRES 266
ENGINE SPECIFICATIONS 267
Fuel Injection Nozzles 267
Fuel Injection Pump 267
Cylinder Head 267
Valves 267
Valve Springs 267
Rocker Arms 267
Camshaft 267
Cylinders 268
Piston Rings 268
Pistons 268
Crankshaft 268
Oil Pump 268
Engine Oil 268
ENGINE BOLT TORQUES 269
SPECIFICATIONS (742B) 271
SPECIFICATIONS 273
LOADER DIMENSIONS 273
OPERATIONS & PERFORMANCE 273
ENGINE 273
HYDRAULIC SYSTEM 274
ELECTRICAL 274
DRIVE SYSTEM 274
CAPACITIES 274
TIRES 274
ENGINE SPECIFICATIONS 275
General 275
Cylinder Head 275
Cylinder Block 275
Piston 275
Piston Pin 275
Connecting Rod 276
Crankshaft 276
Flywheel 276
Camshaft 276
Valve Train 276
Valve Guide 277
Valve Spring 277
Rocker Arm And Shaft 278
Oil Pump 278
Fuel Pump 278
Carburetor 278
Water Pump 278
Thermostat 278
Starter 279
Alternator 279
Distributor 279
Spark Plugs 279
Engine Torque 279
TECHNICAL DATA 281
HYDRAULIC/HYDROSTATIC FLUID SPECIFICATIONS 283
DECIMAL AND MILLIMETER EQUIVALENTS 284
U S TO METRIC CONVERSION 284
TORQUE FOR GENERAL METRIC BOLTS 285
STANDARD TORQUE SPECIFICATIONS FOR BOLTS 286
SERVICE MANUAL REVISIONS 287
742B, 743B–001 287
742B, 743B–002 289
742B, 743B–003 291
742B, 743B–004 293
742B, 743B-005 295
DESCRIPTION:
Bobcat 742B 743B Loader Service Manual 6720772 (6-12) – PDF DOWNLOAD
FOREWORD:
This manual is for the Bobcat loader mechanic. It provides necessary servicing and adjustment procedures for the Bobcat loader and its component parts and systems. Refer to the Operation & Maintenance Manual for operating instructions, starting procedure, daily checks, etc.
SAFETY INSTRUCTIONS:
The following publications provide information on the safe use and maintenance of the loader and attachments:
• The Delivery Report is used to assure that complete instructions have been given to the new owner and that the machine
is in safe operating condition.
• The Operation & Maintenance Manual delivered with the loader gives operating information as well as routin e
maintenance and service procedures. It is a part of the loader and must stay with the machine when it is sold. Replacement
Operation & Maintenance Manuals can be ordered from your Bobcat loader dealer.
• The loader has machine signs (decals) which instruct on the safe operation and care. The signs and their locations are
shown in the Operation & Maintenance Manual. Replacement signs are available from your Bobcat loader dealer.
• The loader has a plastic Operator’s Handbook fastened to the operator cab. Its brief instructions are convenient to the
operator. The handbook is available from your dealer in an English edition or one of the following languages: French,
German, Italian, Dutch & Spanish editions.
• The EMI Safety Manual (available in Spanish) delivered with the loader gives general safety information.
• The Service Manual and Parts Manual are available from your dealer for use by mechanics to do shop–type service and
repair work.
• The Skid–Steer Loader Operator Training Course is available through your local dealer. This course is intended to provide
rules and practices for correct operation of the Bobcat loader. The course is available in English and Spanish versions.
• The Bobcat Skid–Steer Loader Safety Video is available from your Bobcat Dealer.
VIDEO PREVIEW OF THE MANUAL:
IMAGES PREVIEW OF THE MANUAL:
PLEASE NOTE:
- This is the same manual used by the dealers to diagnose and troubleshoot your vehicle
- You will be directed to the download page as soon as the purchase is completed. The whole payment and downloading process will take anywhere between 2-5 minutes
- Need any other service / repair / parts manual, please feel free to contact [email protected] . We still have 50,000 manuals unlisted
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