Bobcat 753 Loader Service Manual 6720326 (6-12) – PDF DOWNLOAD
FILE DETAILS:
Bobcat 753 Loader Service Manual 6720326 (6-12) – PDF DOWNLOAD
Language : English
Pages : 358
Downloadable : Yes
File Type : PDF
TABLE OF CONTENTS:
Bobcat 753 Loader Service Manual 6720326 (6-12) – PDF DOWNLOAD
MAINTENANCE SAFETY 3
CONTENTS 7
FOREWORD 5
SAFETY INSTRUCTIONS 9
SERIAL NUMBER LOCATIONS 10
LOADER SERIAL NUMBER 10
ENGINE SERIAL NUMBER LOCATION 10
DELIVERY REPORT 10
BOBCAT LOADER IDENTIFICATION 11
PREVENTIVE MAINTENANCE 13
SERVICE SCHEDULE 15
LIFTING AND BLOCKING THE LOADER 16
Procedure 16
TRANSPORTING THE LOADER 17
Procedure 17
LIFTING THE LOADER 17
Procedure 17
LIFT ARM SUPPORT DEVICE 18
To Disengage Lift Arm Support Device 18
To Disengage Lift Arm Support Device 18
OPERATOR CAB 19
Description 19
Raising The Operator Cab 19
Lowering The Operator Cab 19
Raising The Operator Cab (W/Hand Controls) 20
Lowering The Operator Cab (W/Hand Controls) 21
SEAT BAR SYSTEM 22
Description 22
Seat Bar Inspection 22
Seat Bar Maintenance 22
AIR CLEANER 23
Replacement Of The Filter Element 23
FUEL SYSTEM 25
Fuel Specifications 25
Filling The Fuel Tank 25
Fuel Filter 25
Removing Air From The Fuel System 26
ENGINE LUBRICATION SYSTEM 27
Checking Engine Oil 27
Replacement Of Oil And Filter 27
ENGINE COOLING SYSTEM 29
Cleaning The Cooling System 29
Coolant Level 29
Removing Coolant From The Cooling System 30
ALTERNATOR BELT 31
Adjusting The Alternator Belt 31
USING A BOOSTER BATTERY (JUMP STARTING) 32
Procedure 32
HYDRAULIC/HYDROSTATIC SYSTEM 33
Checking And Adding Fluid 33
Hydraulic/Hydrostatic Filter Replacement 33
Hydraulic Reservoir Breather Cap 33
SPARK ARRESTOR MUFFLER 34
Cleaning Procedure 34
TIRE MAINTENANCE 35
Wheel Nuts 35
Tire Rotation 35
Tire Mounting 35
FINAL DRIVE TRANSMISSION (CHAINCASE) 36
Checking And Adding Oil 36
FAN GEARBOX 36
Checking Grease Level 36
DRIVE BELT 37
Adjustment 37
Drive Belt Replacement 38
LUBRICATION OF THE LOADER 39
Procedure 39
REMOTE START SWITCH 41
Procedure 41
DIAGNOSTIC TOOL 42
Procedure 42
SENDER AND SENSOR 42
Service Checks 42
Component 42
MONITOR SERVICE CODES 44
TROUBLESHOOTING THE BOSS® & LCD DISPLAY 46
HYDRAULIC SYSTEM 47
HYDRAULIC / HYDROSTATIC SCHEMATICS 49
TROUBLESHOOTING 61
HYDRAULIC SYSTEM INFORMATION 62
Flare Connections 62
O–Ring Face Seal Connection 62
Straight Thread O–Ring Fitting 62
Tubelines And Hoses 62
LIFT CYLINDER(S) 63
Checking The Lift Cylinder(s) 63
Removal And Installation 63
TILT CYLINDER 65
Checking The Tilt Cylinder 65
Removal And Installation 65
Rod End Seal 66
HYDRAULIC CONTROL VALVE 67
Checking The Main Relief Valve 67
Main Relief Valve Removal And Installation 68
HYDRAULIC CONTROL VALVE (753H) 69
Checking The Dual Pressure Main Relief Valve (Low Setting) 69
Checking The Dual Pressure Main Relief Valve (High Setting) 70
Adjusting The Dual Pressure Main Relief Valve (Low Setting) 72
Adjusting The Dual Pressure Main Relief Valve (High Setting) 73
SELECT VALVE (753H) 74
Checking The Main Relief Valve In High Horsepower Select Valve 74
HYDRAULIC CONTROL VALVE 75
Removal And Installation 75
HYDRAULIC PUMP 76
Checking The Output Of The Pump 76
Checking The Output Of The High Flow Pump 77
Removal And Installation 79
HYDRAULIC FILTER HOUSING 81
Removal And Installation 81
HYDRAULIC FLUID RESERVOIR 83
Removal And Installation 83
CONTROL PEDALS 84
Removal And Installation 84
Adjustment 84
PEDAL INTERLOCK LINKAGE 85
Removal And Installation 85
Adjustment 85
DIVERTER VALVE (OPT ) 86
Removal And Installation 86
HAND CONTROLS 87
Adjustment 87
Removal And Installation 88
HYDROSTATIC SYSTEM 97
TROUBLESHOOTING 99
HYDROSTATIC SYSTEM INFORMATION 100
Replenishing Valve Function 100
FRONT PANEL 101
Removal And Installation 101
STEERING LEVERS 103
Disassembly And Assembly 103
STEERING LEVER CONTROL HANDLE 105
Disassembly And Assembly 105
STEERING LINKAGE 106
508611001–90879511011001 & Above 511350001 & Above 511475001–75023511525001 & Above 512711001–11125, 11131 & 11139 106
Steering Linkage Adjustment 106
Removal And Installation 108
Centering Plate 109
Pintle Arm Repair 111
512711126 – 11130, 11132 – 11138 & 11140 & Above 508690870 & Above 511475024 & Above 111
Steering Linkage Adjustment 112
Steering Neutral Adjustment 114
Removal and Installation 115
HYDROSTATIC MOTOR 117
Removal And Installation 117
HYDROSTATIC PUMP 119
Removal And Installation 119
OIL COOLER 122
Removal And Installation 122
DRIVE BELT TENSIONER PULLEY 123
Disassembly 123
Assembly 125
Checking Pulley End Play 129
DRIVE SYSTEM 131
PARKING BRAKE 133
Adjustment 133
Removal And Installation 134
Brake Block And Pads 137
Brake Discs 139
CENTER TRANSMISSION COVER 140
Installation 140
FRONT CHAINCASE COVER 141
Removal And Installation 141
REAR CHAINCASE COVER 141
Removal And Installation 141
MOTOR CARRIER 142
Shaft Seal Replacement 142
Removal And Installation (Later Models) 144
Disassembly And Assembly (Later Models) 145
Disassembly And Assembly (Early Models) 145
AXLE SEAL 146
Removal And Installation 146
AXLE, SPROCKET AND BEARINGS 149
Removal And Installation 149
Checking Axle End Play 149
DRIVE CHAIN 153
Removal And Installation 153
CHAINCASE FLUID 154
Replacing The Chaincase Fluid 154
MAIN FRAME 155
OPERATOR CAB GAS CYLINDER 157
Removal And Installation 157
Disassembly And Assembly 158
OPERATOR CAB 159
Removal And Installation 159
REAR DOOR 160
Removal And Installation 160
SEAT BAR 160
Removal 160
Installation 160
REAR GRILL 161
Removal And Installation 161
BOB–TACH 162
Removal And Installation 162
Bob–Tach Lever And Wedge 165
Bob–Tach Stops (If Equipped) 166
LIFT ARMS 167
Removal And Installation 167
FUEL TANK 169
Removal And Installation 169
Fuel Level Sender 170
ELECTRICAL SYSTEM 171
ELECTRICAL SCHEMATICS 173
ELECTRICAL SYSTEM INFORMATION 223
Description 223
TROUBLESHOOTING 223
BATTERY 224
Removal And Installation 224
ALTERNATOR 225
Checking The Alternator Output (Old Style) 225
Checking The Alternator Regulator (Old Style) 226
Alternator Output Test (New Style) 227
Rectifier (Diode) Test (New Style) 227
Alternator Regulator Test (New Style) 228
Removal And Installation (Old Style) 229
Disassembly (Old Style) 230
Checking The Rotor (Old Style) 230
Checking The Stator (Old Style) 231
Checking The Rectifier (Old Style) 231
Disassembly And Inspection (New Style) 233
Stator Continuity Test (New Style) 233
Stator Ground Test (New Style) 233
Rotor Continuity Test (New Style) 234
Rotor Ground Test (New Style) 234
Rectifier Continuity (Diode) Test (New Style) 234
Assembly (New Style) 235
STARTER 236
Checking The Starter 236
Removal And Installation 236
Disassembly And Assembly 237
Cleaning And Inspection 239
Parts Identification 240
OPERATING SYSTEM UNIT 241
Removal And Installation 241
INSTRUMENT PANEL (S/N 11079 & Above) 242
Removal And Installation 242
ENGINE SERVICE 243
TROUBLESHOOTING 245
RADIATOR 246
Removal And Installation 246
ENGINE MUFFLER 248
Removal And Installation 248
BLOWER HOUSING/FAN GEARBOX 249
Removal And Installation 249
Tension Pulley Removal And Installation 252
FAN GEARBOX 253
Disassembly 253
Long Housing 253
Short Housing 255
Assembly 258
Long Housing 258
Short Housing 260
Checking Backlash 263
Parts Identification 266
AIR CLEANER 267
Removal And Installation 267
ENGINE 269
Removal And Installation 269
S/N 11079 & Above 273
Installation 275
FLYWHEEL 276
Removal And Installation 276
Flywheel Ring Gear 276
BELT SHIELD 277
Removal And Installation 277
VALVE CLEARANCE 278
Adjustment 278
ENGINE COMPRESSION 278
Checking 278
GLOW PLUGS 279
Removal And Installation 279
Checking 279
FUEL INJECTION PUMP 280
Checking The Injection Pump 280
Adjusting Shut–Off Linkage 280
Removal And Installation 281
Timing The Injection Pump 283
FUEL INJECTION NOZZLES 284
Removal And Installation 284
Checking The Injector Nozzle 286
CYLINDER HEAD 287
Removal And Installation 287
Disassembly And Assembly 288
Servicing The Cylinder Head 289
Top Clearance 289
VALVE, VALVE SEAT AND GUIDE 290
Checking The Valve Guide 290
Reconditioning The Valve And Valve Seat 291
Valve Spring 292
ROCKER ARM AND SHAFT 293
Checking 293
TIMING GEARCASE COVER 294
Removal And Installation 294
IDLER GEAR AND CAMSHAFT 296
Removal And Installation 296
Servicing The Camshaft 297
Servicing The Idler Gear And Shaft 298
TIMING GEARS 299
Checking Backlash 299
FUEL CAMSHAFT 300
Removal And Installation 300
Governor 300
CRANKSHAFT GEAR 301
Removal And Installation 301
OIL PUMP 301
Removal And Installation 301
Oil Pump Service 301
Checking Engine Oil Pressure 302
Relief Valve 302
PISTON AND CONNECTING ROD 303
Removal And Installation 303
Servicing The Piston And Connecting Rod 304
Connecting Rod Alignment 306
CRANKSHAFT AND BEARINGS 307
Removal And Installation 307
Servicing The Crankshaft And Bearings 308
CYLINDER BORE 312
Checking The Cylinder Bore 312
WATER PUMP 313
Disassembly And Assembly 313
SPECIFICATIONS 315
753 LOADER SPECIFICATIONS 317
LOADER DIMENSIONS 317
OPERATIONS & PERFORMANCE 317
ENGINE 317
HYDRAULIC SYSTEM 318
ELECTRICAL 318
DRIVE SYSTEM 318
CAPACITIES 318
TIRES 318
753H LOADER SPECIFICATIONS 319
LOADER DIMENSIONS 319
OPERATIONS & PERFORMANCE 319
ENGINE 319
HYDRAULIC SYSTEM 320
ELECTRICAL 320
DRIVE SYSTEM 320
CAPACITIES 320
TIRES 320
ENGINE SPECIFICATIONS 321
Fuel Injection Nozzles 321
Fuel Injection Pump 321
Cylinder Head 321
Valves 321
Valve Springs 321
Valve Timing 321
Rocker Arms 321
Camshaft 322
Tappet 322
Cylinders 322
Piston Rings 322
Piston 322
Connecting Rod 322
Oil Pump 322
Crankshaft 323
Timing Gear 323
Thermostat 323
Crankshaft Re–Grind Data 324
Torque For General Metric Bolts 325
TORQUE SPECIFICATIONS FOR LOADER 326
HYDRAULIC/HYDROSTATIC FLUID SPECIFICATIONS 327
STANDARD TORQUE SPECIFICATIONS FOR BOLTS 328
DECIMAL AND MILLIMETER EQUIVALENTS 329
U S TO METRIC CONVERSION 329
SERVICE MANUAL REVISIONS 331
750-001 331
750-002 333
750-003 335
750-004 337
750-005 339
750-006 341
750-007 343
750-008 345
750-009 347
750-010 349
750-011 351
750-012 353
750-013 355
750-014 357
DESCRIPTION:
Bobcat 753 Loader Service Manual 6720326 (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:
1. 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.
2. The Operation & Maintenance Manual delivered with the loader gives operating information as well as
routine 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.
3. 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.
4. The FIEI Safety Manual delivered with the loader gives general safety information.
5. The Service Manual and Parts Manual are available from your dealer for use by mechanics to do
shop–type service and repair work.
Wear tight fitting clothing and any other required safety apparel when operating or servicing the loader.
• Wear safety glasses when maintaining or servicing the loader.
• Exhaust gases can kill, vent engine exhaust outdoors.
• Know where fire extinguishers and first aid kits are located and how to use them.
• Do not run the Bobcat loader where exhaust, arcs, sparks or hot components can contact flammable material, explosive
dust or gases.
• Check fuel and hydraulic tubes, hoses and fittings for damage and leakage. Never use open flame or bare skin to check
for leaks. Tighten or replace any parts that show leakage. Always clean fluid spills. Do not use gasoline or diesel fuel
for cleaning parts. Use commercial nonflammable solvents.
• Clean the loader before doing any welding. Cover rubber hoses, battery and all other flammable parts. Keep a fire extinguisher
near the loader when welding
• Have good ventilation when welding or grinding painted parts. Wear a dust mask when grinding painted parts. Toxic dust
and gas can be produced.
• Stop the engine and let it cool before adding fuel. No smoking.
• Use the procedure in this manual for connecting and charging batteries.J
• Use the procedure in the Operator’s Manual for cleaning the spark arrestor muffler after each 100 hours of operation.
VIDEO PREVIEW OF THE MANUAL:
IMAGES PREVIEW OF THE MANUAL:
PLEASE NOTE:
- This is the SAME manual used by the dealers to troubleshoot any faults in your vehicle. This can be yours in 2 minutes after the payment is made.
- Contact us at [email protected] should you have any queries before your purchase or that you need any other service / repair / parts operators manual.
S.V