Hitachi ZW50 Wheel Loader Electrical Circuit Diagram + Technical Manual
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Hitachi ZW50 Wheel Loader Electrical Circuit Diagram + Technical Manual
This Listing includes all of the manuals mentioned below:
- Hitachi ZW50 Wheel Loader Technical Manual
- Hitachi ZW50 Wheel Loader Electrical Circuit Diagram Manual
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DESCRIPTION:
Hitachi ZW50 Wheel Loader Electrical Circuit Diagram + Technical Manual
- This manual is written for an experienced technician to provide technical information needed to maintain and repair this machine.
- Be sure to thoroughly read this manual for correct product information and service procedures.
- If you have any questions or comments, at if you found any errors regarding the contents of this manual, please contact using “Service Manual Revision Request Form” at the end of this manual.
- This manual consists the Technical Manual and the Workshop Manual.
- Information included in the Technical Manual: technical information needed for redelivery and delivery, operation and activation of all devices and systems, operational performance tests, and troubleshooting procedures.
- Information included in the Workshop Manual: technical information needed for maintenance and repair of the machine, tools and devices needed for maintenance and repair, maintenance standards, and removal/installation and assemble/ disassemble procedures.
TABLE OF CONTENTS:
Hitachi ZW50 Wheel Loader Technical Manual
T4ER-EN-00………………………………………….. 1
INTRODUCTION………………………………………… 3
SAFETY……………………………………………… 5
SECTION AND GROUP CONTENTS……………………………. 37
SECTION 1 GENERAL……………………………………. 39
GENERAL / Specification…………………………… 41
SPECIFICATIONS……………………………….. 41
GENERAL / Component Specification………………….. 43
ENGINE………………………………………. 43
HST PUMP…………………………………….. 44
GEAR PUMP……………………………………. 45
ORBITROLL……………………………………. 46
GENERAL / Component Layout………………………… 47
MAIN COMPONENT (OVERVIEW)……………………… 47
MAIN COMPONENT (POWER LINE)……………………. 49
HYDRAULIC SYSTEM (OVERVIEW)……………………. 50
ELECTRICAL SYSTEM (OVERVIEW)…………………… 51
ELECTRICAL SYSTEM (METER PANEL)………………… 53
ENGINE………………………………………. 54
HST PUMP…………………………………….. 55
REDUCTION……………………………………. 56
CONTROL VALVE………………………………… 57
SECTION 2 SYSTEM…………………………………….. 60
SYSTEM / Fuel System……………………………… 62
OUTLINE……………………………………… 62
SYSTEM / Hydraulic System…………………………. 64
OUTLINE……………………………………… 64
HST CIRCUIT………………………………….. 65
HST OIL FILTER……………………………….. 67
BRAKE CIRCUIT………………………………… 68
PARKING BRAKE CIRCUIT…………………………. 69
STEERING CIRCUIT……………………………… 71
MAIN HYDRAULIC CIRCUIT………………………… 73
SYSTEM / Electrical System………………………… 76
OUTLINE……………………………………… 76
ELECTRICAL CIRCUIT (FRONT SIDE)………………… 77
ELECTRICAL CIRCUIT (REAR SIDE)…………………. 78
ELECTRICAL CIRCUIT (COUPLER POSITION)…………… 79
FUSE VALUE AND CIRCUIT MANE……………………. 80
ELECTRICAL POWER CIRCUIT………………………. 82
PREHEAT CIRCUIT (KEY SWITCH: HEAT)……………… 83
PREHEAT CIRCUIT (KEY SWITCH: START TO ON)……….. 84
CHARGING CIRCUIT……………………………… 85
STARTING CIRCUIT……………………………… 86
STOP CIRCUIT…………………………………. 87
MONITOR INDICATOR CIRCUIT……………………… 88
GAUGE CIRCUIT………………………………… 89
TRAVEL CIRCUIT……………………………….. 90
TRAVEL CIRCUIT (FORWARD)………………………. 91
TRAVEL CIRCUIT (BACKWARD)……………………… 92
PARKING BRAKE CIRCUIT…………………………. 93
LIGHT CIRCUIT………………………………… 99
HORN CIRCUIT………………………………….100
AUTO LEVELER CIRCUIT…………………………..100
SECTION 3 COMPONENT OPERATION………………………….103
COMPONENT OPERATION / HST Pump……………………..105
HST CIRCUIT…………………………………..105
HST PUMP……………………………………..106
HIGH-PRESSURE RELIEF VALVE……………………..108
HST PUMP CHARACTERISTIC CURVE…………………..110
DA CONTROL……………………………………111
DISPLACEMENT ANGLE RETURN FORCE AND ADVANCE………120
INCHING VALVE…………………………………121
AUTOMATIC TRANSMISSION FUNCTION…………………122
TORQUE CONTROL FUNCTION………………………..122
COMPONENT OPERATION / HST Motor…………………….123
HST MOTOR…………………………………….123
PILOT PRESSURE PROPORTIONAL CONTROL (HD CONTROL)….124
CONSTANT PRESSURE CONTROL………………………124
HD CONTROL……………………………………125
COMPONENT OPERATION / Axle…………………………129
AXLE…………………………………………129
DIFFERENTIAL ASSEMBLY………………………….130
FINAL DRIVE ASSEMBLY…………………………..131
COMPONENT OPERATION / Brake………………………..133
SERVICE BRAKE…………………………………133
PARKING BRAKE…………………………………136
TOWING MACHINE METHOD (IN EMERGENCY)…………….138
WET TYPE BRAKE ASSEMBLY IN REDUCTION GEAR………..139
MASTER CYLINDER……………………………….140
COMPONENT OPERATION / Orbitroll…………………….141
POWER STEERING (ORBITROLL)……………………..141
OPERATION IN NEUTRAL…………………………..143
AT RIGHT SWING OPERATION……………………….144
AT RELIEF VALVE OPERATION………………………145
COMPONENT OPERATION / Control Valve…………………147
CONTROL VALVE…………………………………147
OPERATION…………………………………….148
OPERATION OF TILT SECTION………………………150
OPERATION OF LIFT SECTION………………………153
DETENT OPERATION………………………………157
RELIEF VALVE………………………………….158
ANTI-VDID VALVE……………………………….160
COMPONENT OPERATION / Main Pump…………………….161
MAIN PUMP…………………………………….161
RETURN FILTER…………………………………162
SECTION 4 OPERATIONAL PERFORMANCE TEST………………….164
OPERATIONAL PERFORMANCE TEST / Introduction………….166
OPERATIONAL PERFORMANCE TESTS…………………..166
PREPARATION FOR PERFORMANCE TEST………………..167
OPERATIONAL PERFORMANCE TEST / Standard……………..168
PERFORMANCE STANDARD…………………………..168
OPERATIONAL PERFORMANCE TEST / Engine Test…………..170
ACT. ENG SPEED………………………………..170
ENGINE COMPRESSION PRESSURE…………………….171
VALVE CLEARANCE……………………………….172
NOZZLE……………………………………….174
OPERATIONAL PERFORMANCE TEST / Wheel Loader Test……..176
TRAVEL SPEED………………………………….176
SERVICE BRAKE CONTROL FUNCTION………………….178
PARKING BRAKE CONTROL FUNCTION………………….179
HYDRAULIC CYLINDER CYCLE TIME…………………..180
HYDRAULIC CYLINDER DRIFT CHECK………………….182
CONTROL LEVER OPERATING FORCE…………………..183
CONTROL LEVER STROKE…………………………..184
MAIN RELIEF SET PRESSURE……………………….185
STEERING RELIEF PRESSURE……………………….186
DA CONTROL PRESSURE IN HST PUMP…………………187
LOW RELIEF PRESSURE IN HST PUMP…………………188
HIGH RELIEF PRESSURE IN HST PUMP………………..189
SECTION 5 TROUBLESHOOTING……………………………..191
TROUBLESHOOTING / Diagnosing Procedure………………193
INTRODUCTION………………………………….193
DIAGNOSING PROCEDURE…………………………..194
TROUBLESHOOTING / Failure List……………………..197
TROUBLESHOOTING / Engine…………………………..199
TROUBLESHOOTING / Vehicle Performance……………….209
SERVICE MANUAL REVISION REQUEST FORM……………………274
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