Kubota U48-4, Workshop Manual

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CONTENTS
TO THE READER
TO THE READER
INFORMATION
CONTENTS
INFORMATION
1. SAFETY FIRST ............................................ I-1
2. SAFETY DECALS ........................................ I-4
GENERAL
CONTENTS
GENERAL
1. CHECKING EXCAVATOR
IDENTIFICATION ........................................G-1
2. ENGINE IDENTIFICATION .........................G-2
3. GENERAL PRECAUTIONS.........................G-4
4. HANDLING PRECAUTIONS FOR
ELECTRICAL PARTS AND WIRING...........G-8
5. TIGHTENING TORQUES..........................G-12
6. NEW PRODUCT FEATURE
(EUROPEAN VERSION) ...........................G-17
7. NEW FEATURES OUTLINE......................G-20
8. QUALITY SPECIFICATIONS ....................G-22
9. WATER AND OIL QUANTITY ...................G-33
10. DESCRIPTION OF PARTS .......................G-34
11. MAINTENANCE CHECK LIST ..................G-41
MACHINE BODY
CONTENTS
SERVICING
1. FRONT OPERATING MACHINE............... 1-S1
2. SWIVEL FRAME........................................ 1-S3
3. TRACK FRAME ....................................... 1-S21
ENGINE
CONTENTS
GENERAL
1. ENGINE .....................................................2-G1
2. SPECIAL TOOLS ......................................2-G5
MECHANISM
1. FEATURE ................................................. 2-M1
2. ENGINE BODY......................................... 2-M2
3. LUBRICATING SYSTEM.......................... 2-M7
4. COOLING SYSTEM ................................. 2-M8
5. FUEL SYSTEM....................................... 2-M10
SERVICING
1. TROUBLESHOOTING............................... 2-S1
2. SERVICING SPECIFICATIONS ................ 2-S4
3. TIGHTENING TORQUES........................ 2-S10
4. CHECKING, DISASSEMBLING AND
SERVICING ............................................. 2-S13
HYDRAULIC SYSTEM
CONTENTS
MECHANISM
1. DIAGRAM OF HYDRAULIC CIRCUIT...... 3-M1
2. HYDRAULIC DEVICE LAYOUT ............... 3-M3
3. FEATURES............................................... 3-M4
4. PUMP ....................................................... 3-M8
5. CONTROL VALVE.................................. 3-M32
6. SWIVEL MOTOR.................................... 3-M54
7. TRAVEL MOTOR.................................... 3-M60
8. HYDRAULIC CYLINDER ........................ 3-M82
9. PILOT VALVE......................................... 3-M92
10. UNLOAD VALVE .................................. 3-M103
11. HOLDING VALVE ................................. 3-M107
12. SERVICE PORT ................................... 3-M111
SERVICING
1. PUMP.........................................................3-S1
2. CONTROL VALVE...................................3-S34
3. SWIVEL MOTOR.....................................3-S63
4. SWIVEL JOINT ........................................3-S77
5. TRAVEL MOTOR.....................................3-S81
6. HYDRAULIC CYLINDER .......................3-S140
7. PILOT VALVE (CONTROL) ...................3-S153
8. PILOT VALVE (TRAVEL).......................3-S163
9. PILOT VALVE (BLADE, SWING)...........3-S173
10. UNLOAD VALVE ...................................3-S184
11. THIRD LINE VALVE ASSEMBLY ..........3-S189
12. ROUTING OF HYDRAULIC HOSES .....3-S191
13. BOOM HOLDING VALVE ......................3-S217
14. MEASURING HYDRAULIC DEVICE
PERFORMANCE ...................................3-S223
15. TROUBLESHOOTING...........................3-S244
ELECTRICAL SYSTEM
CONTENTS
SERVICING
1. ELECTRONIC DEVICE LAYOUT ..............4-S1
2. WIRING CIRCUIT ......................................4-S2
3. TROUBLESHOOTING (START-UP
EQUIPMENT VERSION) .........................4-S13
4. INSPECTIONS.........................................4-S15
5. Instrument Panel Operating Guide ..........4-S22
6. TROUBLESHOOTING (METER
PANEL EDITION) ....................................4-S77
CABIN
CONTENTS
MECHANISM
1. AIR CONDITIONING SYSTEM................. 5-M1
2. WIPER .................................................... 5-M20
SERVICING
1. TROUBLESHOOTING...............................5-S1
2. MAINTENANCE AND
SERVICE RELATED SPECIFICATIO
NS ..............................................................5-S4
3. TORQUE....................................................5-S5
4. PRECAUTIONS WHEN REPAIRING
THE REFRIGERANT SYSTEM .................5-S6
5. INSPECTING AND CHARGING THE
REFRIGERANT SYSTEM .......................5-S12
6. INSPECTION AND DISASSEMBLY ........5-S21
7. CABIN REMOVAL AND MOUNTING ......5-S38
8. WINDOW WASHER ................................5-S40
9. LIGHTING DEVICES (CAB WORK
LIGHT, INTERIOR LIGHT) ......................5-S43
10. REMOVAL AND INSTALLATION OF
GLASS.....................................................5-S46
11. FRONT WINDOW....................................5-S49
KiSC issued 03, 2010 A