Hitachi LX70-7 LX80-7 Wheel Loader Workshop + Technical + Operational Principle Manual
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Hitachi LX70-7 LX80-7 Wheel Loader Workshop + Technical + Operational Principle Manual
This Manual Includes:
- Hitachi LX70-7 LX80-7 Wheel Loader Workshop Manual
- Hitachi LX70-7 LX80-7 Operational Principle Training Text Manual
- Hitachi LX70-7 LX80-7 Technical Manual
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DESCRIPTION:
Hitachi LX70-7 LX80-7 Wheel Loader Workshop + Technical + Operational Principle Manual
- With our pursuit of technological researches and vast experiences, we have been developing products of superior quality and reliability for complete customer satisfaction. To use the machines safely with its full performance for a long time, proper handling and periodical inspections/maintenance are essential.
- This manual describes mainly disassembly, inspection, assembly and adjustment of the main components and systems of the wheel loaders.
- For the structure and the principle of operation, refer to the service manual. We hope this manual will be your good companion in your servicing jobs.
- The values and descriptions given in this manual are subject to change owing to change of design or some other reason.
- Our company offers a wide variety of wheel loaders which have been enthusiastically welcomed by users all over the world. The Models LX70-7 and LX80-7, articulated type wheel loaders, are the latest products developed from years of research and experience.
- To get the most of the loader, it is required that you become familiar with its features, construction, operating and maintenance procedures.
- This Service Manual explains the structure of the above loaders for service personnel and shop workers. We hope it will be your reference guide during servicing jobs.. The descriptions and specifications described in this manual are subject to change without notice.
TABLE OF CONTENTS:
Hitachi LX70-7 LX80-7 Wheel Loader Workshop Manual
COVER…………………………………………………………………………… 1
IMPORTANT SAFETY NOTICE…………………………………………………………… 3
FOREWORD………………………………………………………………………… 5
0. GENERAL DESCRIPTION……………………………………………………………. 7
01. SAFETY PRECAUTIONS………………………………………………………… 9
02. FUNDAMENTAL KNOWLEDGE OF MAINTENANCE………………………………………… 12
03. CLEANING…………………………………………………………………. 15
04. STANDARD BOLT TIGHTENING TORQUE…………………………………………….. 16
05. LUBRICATION………………………………………………………………. 22
06. SAFETY PARTS TO BE REPLACED PERIODICALLY…………………………………….. 25
1. POWER TRAIN…………………………………………………………………… 27
11. DISASSMBLY AND REASSEMBLY OF HST PUM………………………………………… 29
11.1 DISASSEMBLY OF HST PUMP ………………………………………………. 31
11.2 REASSEMBLY OF HST PUMP………………………………………………… 33
11.3 DISASSMBLY AND REASSEMBLY OF COMBINATION VALVE 1…………………………. 35
11.4 DISASSMBLY AND REASSEMBLY OF COMBINATION VALVE 2…………………………. 38
11.5 STANDARD VALUES FOR MAINTENANCE………………………………………… 40
12. DISASSEBLY AND REASSEMBLY OF TRANSMISSION……………………………………. 41
12.1 DISASSMBLY OF TRANSMISSION…………………………………………….. 41
12.1.1 PREPARATION…………………………………………………….. 41
12.1.2 DISASSEMBLY OF TRANSMISSION CASE………………………………….. 41
12.1.3 DISASSEMBLY OF CLUTCH ASSEMBLY……………………………………. 46
12.1.4 DISASSEMBLY OF CONTROL VALVE……………………………………… 49
12.1.5 DISASSEMBLY OF OUTPUT SHAFT………………………………………. 49
12.2 REASSEMBLY OF TRANSMISSION……………………………………………. 51
12.2.1 REASSEMBLY OF OUTPUT SHAFT……………………………………….. 51
12.2.2 REASSEMBLY OF CONTROL VALVE………………………………………. 52
12.2.3 REASSEMBLY OF CLUTCH ASSEMBLY…………………………………….. 54
12.2.4 REASSEMBLY OF TRANSMISSION CASE…………………………………… 58
12.3 STANDARD VALUES FOR MAINTENANCE………………………………………… 64
13. DESASSEMBLY AND REASSEMBLY OF DRIVE AXLE…………………………………….. 69
13.1 DISASSEMBLY………………………………………………………….. 69
13.2 REASSEMBLY…………………………………………………………… 79
13.3 TROUBLESHOOTING………………………………………………………. 96
13.4 STANDARD VALUES FOR MAINTENANCE………………………………………… 98
13.5 TIGHTENING TORQUE VALUES FOR MAIN BOLTS…………………………………. 99
2. BRAKE SYSTEM…………………………………………………………………..101
21. DISASSEMBLY AND REASSEMBLY OF BRAKE VALVE…………………………………….103
21.1 DISASSEMBLY…………………………………………………………..104
21.2 REASSEMBLY……………………………………………………………105
3. STEERING SYSTEM………………………………………………………………..107
31. DISASSEMBLY AND REASSEMBLY OF ORBITROL……………………………………….109
31.1 DISASSEMBLY…………………………………………………………..110
31.2 REASSEMBLY……………………………………………………………113
32. DISASSEMBLY ADN REASSEMBLY OF STEERING CYLINDER……………………………….117
32.1 DISASSEMBLY…………………………………………………………..118
32.2 INSPECTION……………………………………………………………119
32.3 REASSEMBLY……………………………………………………………120
33. DISASSEMBLY AND REASSEMBLY OF PRIORITY VALVE………………………………….123
33.1 DISASSEMBLY…………………………………………………………..124
33.2 REASSEMBLY……………………………………………………………124
4. HYDRAULIC SYSTEM……………………………………………………………….125
41. DISASSEMBLY AND REASSEMBLY OF MAIN PUMP………………………………………127
42. DISASSEMBLY AND REASSEMBLY OF MAIN VALVE……………………………………..130
42.1 DISASSEMBLY…………………………………………………………..131
42.2 TREATMENT AFTER DISASSEMBLY…………………………………………….132
42.3 REASSEMBLY……………………………………………………………133
42.4 ADJUSTMENT OF RELIEF VALVE……………………………………………..135
43A. DISASSEMBLY AND REASSEMBLY FO BOOM CYLINDER AND BUCKET CYLINDER (L12-3, LX70-7)….136
43A.1 DISASSEMBLY………………………………………………………….137
43A.2 INSPECTION…………………………………………………………..138
43A.3 REASEMBLY……………………………………………………………139
43B. DISASSEMBLY AND REASSEMBLY OF BUCKET CYLINDER (L16-3, LX80-7)………………….142
43B.1 DISASSEMBLY………………………………………………………….143
43B.2 INSPECTION…………………………………………………………..144
43B.3 REASSEMBLY…………………………………………………………..145
44. DISASSEMBLY AND REASSEMBLY OF TRAVEL DAMPER VALVE FOR APS (OPTION)………………148
44.1 DISASSEMBLY…………………………………………………………..149
44.2 TREATMENT AFTER DISASSEMBLY…………………………………………….151
44.3 REASSEMBLY……………………………………………………………151
44.4 ADJUSTMENT OF PRESSURE REDUCING VALVE SET PRESSURE………………………..153
44.5 MAINTENACE PROCEDURE OF SOLENOID VALVE…………………………………..154
5. ELECTRIC UNIT………………………………………………………………….157
51. ELECTRICAL EQUIPMENT LAYOUT DRAWING………………………………………….159
52. WIRE HARNESS (REFERENCE)……………………………………………………166
53. STARTING SYSTEM ELECTRIC CIRCUIT…………………………………………….177
54. ELECTRIC CIRCUIT DIAGRAM……………………………………………………179
6. ENGINE AND ACCESSORY……………………………………………………………183
GENERAL INFORMATION……………………………………………………………187
MAINTENANCE…………………………………………………………………..213
ENGINE ASSEMBLY 1……………………………………………………………..233
ENGINE ASSEMBLY 2……………………………………………………………..249
ENGINE ASSEMBLY 3……………………………………………………………..279
LUBRICATING SYSTEM…………………………………………………………….309
FUEL SYSTEM…………………………………………………………………..319
TURBOCHARGER………………………………………………………………….329
AIR COMPRESSOR………………………………………………………………..333
ENGINE ELECTRICALS…………………………………………………………….341
TROUBLESHOOTING……………………………………………………………….349
SPECIAL TOOL LIST……………………………………………………………..373
REPAIR STANDARDS………………………………………………………………377
CONVERSION TALBE………………………………………………………………397
REVISION REQUEST FORM……………………………………………………………..407
Hitachi LX70-7 LX80-7 Operational Principle Training Text Manual
RETURN…………………………………………………… 0
Operational Principle……………………………………… 1
FOREWORD…………………………………………………. 2
CONTENTS…………………………………………………. 4
0. SPECIFICATIONS…………………………………………. 8
0.1 Outer Views ……………………………………… 8
0.2 Specifications …………………………………… 10
1. ENGINE AND RELATED COMPONENTS……………………………. 12
1.1 Engine ………………………………………….. 12
1.2 Lubricating System ……………………………….. 16
1.3 Cooling System …………………………………… 17
1.4 Fuel System ……………………………………… 19
1.5 Intake and Exhaust System …………………………. 21
1.6 Electrical System ………………………………… 23
1.7 Engine Control Unit ………………………………. 25
2. POWER TRAIN……………………………………………. 28
2.1 HST Unit ………………………………………… 30
2.1.1 Hydraulic Drive …………………………….. 30
2.1.2 HST and HST Charge Circuit …………………… 33
2.1.3 HST Control ………………………………… 36
2.2 HST Pump ………………………………………… 38
2.2.1 General Description …………………………. 39
2.2.2 Pump Control ……………………………….. 45
2.2.3 Neutrol Damp Solenoid Valve ………………….. 58
2.2.4 FNR Solenoid Valve ………………………….. 59
2.3 HST Motor ……………………………………….. 61
2.3.1 General Description …………………………. 62
2.3.2 Regulator ………………………………….. 66
2.3.3 Motor Combination Valve ……………………… 68
2.3.4 Motor Tilt-Rolling Seed Control Valve …………. 70
2.3.5 Stock-Pile & Snow (S&S) Mode (Option for LX80-7)…. 71
2.4 Transmission …………………………………….. 73
2.4.1 Clutch Shaft ……………………………….. 77
2.4.2 Transmission Control Valve …………………… 79
2.4.3 Transmission Circuit ………………………… 80
2.4.4 Quick Shift Switch (QSS) (Option) …………….. 84
2.5 Propeller Shaft ………………………………….. 86
2.6 Drive Axles (Front and Rear) ………………………. 88
2.6.1 Axle ………………………………………. 88
2.6.2 Differential ……………………………….. 92
2.6.3 Final Reduction Gear ………………………… 94
2.7 Wheel Assembly (Tire and Wheel) ……………………. 96
2.7.1 Tire ………………………………………. 96
2.7.2 Wheel ……………………………………… 96
3. BRAKE SYSTEM…………………………………………… 98
3.1 Service Brake ……………………………………. 99
3.1.1 General Description (Brake Line) ……………… 99
3.1.2 Brake Valve …………………………………104
3.1.3 Disk Brake ………………………………….108
3.1.4 Brake Oil Tank ………………………………109
3.2 Parking Brake …………………………………….110
3.2.1 General Description (Brake Line) ………………111
3.2.2 Parking Brake Electric Circuit ………………..114
3.2.3 Parking Brake ……………………………….117
3.2.4 Adjusting Parking Brake ………………………118
4. STEERING SYSTEM…………………………………………120
4.1 General Description ……………………………….120
4.2 Oil Circulation Routes …………………………….122
4.3 Steering Wheel Unit ……………………………….123
4.4 Steering Valve (Orbitrol) ………………………….124
4.5 Priority Valve ……………………………………129
4.6 Cushion Valve (LX80-7 only) ………………………..134
4.7 Steering Cylinder ………………………………..136
5. FRAME AND COCKPIT……………………………………….138
5.1 Frame ……………………………………………138
5.2 Center Hinge Pin ………………………………….140
6. HYDRAULIC SYSTEM………………………………………..144
6.1 Oil Circulation Routes …………………………….144
6.2 Pump …………………………………………….146
6.3 Control Valve …………………………………….150
6.3.1 General Description ………………………….150
6.3.2 Operation …………………………………..153
6.3.3 Relief Valve ………………………………..157
6.4 Valve Controls……………………………………..160
6.5 Oil Tank …………………………………………162
7. LOAD HANDLING SYSTEM…………………………………….164
7.1 Boom, Bellcrank, and Bucket ………………………..165
7.1.1 General Description ………………………….165
7.1.2 Bucket ……………………………………..168
7.1.3 Bucket Leveler ………………………………169
7.1.4 Boom Kickout (Option) ………………………..170
7.2 Cylinders ………………………………………..171
7.2.1 Boom Cylinders ………………………………171
7.2.2 Bucket Cylinder ……………………………..171
8. ELECTRIC SYSTEM…………………………………………176
8.1 Lighting Unit …………………………………….176
8.2 Meters and Switches ……………………………….177
8.2.1 Operating Status Monitors (Cluster Meter Unit) ….177
8.2.2 Lighting Switch and Turn Signal Switch …………179
8.3 Location of Relays ………………………………..180
8.4 Electric Circuit Diagram …………………………..181
SERVICE MANUAL REVISION REQUEST FORM…………………………182
THE ATTACHED DIAGRAM LIST…………………………………..183
Hitachi LX70-7 LX80-7 Technical Manual
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