Hitachi ZW370 G Wheel Loader Operational Principle Technical Manual
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Hitachi ZW370 G Wheel Loader Operational Principle Technical Manual
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Table of contents:
Hitachi ZW370 G Wheel Loader Operational Principle Technical Manual
CONTENTS
General Information ……………………………………………………………………………………………………………………………. 00-1
How to Use Manual …………………………………………………………………………………………………………………………. 00-2
Safety precautions …………………………………………………………………………………………………………………….. 00-2
Symbols …………………………………………………………………………………………………………………………………… 00-3
Outline …………………………………………………………………………………………………………………………………………… 00-4
Layout of main components ………………………………………………………………………………………………………… 00-4
Recommended lubricants …………………………………………………………………………………………………………… 00-8
Coolant ……………………………………………………………………………………………………………………………………. 00-9
Lubrication chart ……………………………………………………………………………………………………………………… 00-10
Weight of main components ……………………………………………………………………………………………………….00-11
Bolt tightening torque ……………………………………………………………………………………………………………….. 00-12
Hose band tightening torque ……………………………………………………………………………………………………… 00-16
Liquid gasket and screw lock agent ……………………………………………………………………………………………. 00-17
Cautions regarding welding repair service …………………………………………………………………………………… 00-19
Measurement for Performance Check …………………………………………………………………………………………………… 03-1
Cautions on Safety ………………………………………………………………………………………………………………………….. 03-2
Standard Measurement Values for Performance Check ……………………………………………………………………….. 03-3
Function & Structure Chassis Group ……………………………………………………………………………………………………… 12-1
Front Chassis …………………………………………………………………………………………………………………………………. 12-2
Loading linkage …………………………………………………………………………………………………………………………. 12-2
Loading linkage pin ……………………………………………………………………………………………………………………. 12-4
Rear Chassis …………………………………………………………………………………………………………………………………. 12-5
Fuel tank (S/N 0101~0262, 9001~9064) ……………………………………………………………………………………….. 12-5
Fuel tank (S/N 0263~, 9065~) ……………………………………………………………………………………………………… 12-6
Floor board mount ……………………………………………………………………………………………………………………… 12-7
Center Pin ……………………………………………………………………………………………………………………………………… 12-8
Upper center pin ……………………………………………………………………………………………………………………….. 12-8
Lower center pin ……………………………………………………………………………………………………………………….. 12-8
Dust seal ………………………………………………………………………………………………………………………………….. 12-9
Check & Adjustment Chassis Group ……………………………………………………………………………………………………… 13-1
Linkage Pin ……………………………………………………………………………………………………………………………………. 13-2
Liner ………………………………………………………………………………………………………………………………………… 13-2
Center Pin ……………………………………………………………………………………………………………………………………… 13-5
Adjusting shim …………………………………………………………………………………………………………………………… 13-5
Grease nipple installation direction ………………………………………………………………………………………………. 13-5
Installing bearing outer ring …………………………………………………………………………………………………………. 13-6
Function & Structure Power Group ……………………………………………………………………………………………………….. 22-1
Power Line …………………………………………………………………………………………………………………………………….. 22-2
Engine / Transmission ……………………………………………………………………………………………………………………… 22-3
Engine / transmission mount ……………………………………………………………………………………………………….. 22-3
Radiator …………………………………………………………………………………………………………………………………………. 22-4
Radiator mount ………………………………………………………………………………………………………………………….. 22-5
Propeller Shaft ……………………………………………………………………………………………………………………………….. 22-6
Second propeller shaft assembly …………………………………………………………………………………………………. 22-7
Third propeller shaft assembly …………………………………………………………………………………………………….. 22-8
Axle Assembly ………………………………………………………………………………………………………………………………… 22-9
Axle Support …………………………………………………………………………………………………………………………………. 22-12
Differential Gear ……………………………………………………………………………………………………………………………. 22-18
Function of T.P.D ……………………………………………………………………………………………………………………… 22-22
Operation of T.P.D ……………………………………………………………………………………………………………………. 22-23
Check & Adjustment Power Group ………………………………………………………………………………………………………… 23-1
Engine …………………………………………………………………………………………………………………………………………… 23-2
Measuring engine speed …………………………………………………………………………………………………………….. 23-2
Measuring engine oil pressure …………………………………………………………………………………………………….. 23-2
Propeller Shaft ……………………………………………………………………………………………………………………………….. 23-3
Propeller shaft phase …………………………………………………………………………………………………………………. 23-3
Second propeller shaft alignment …………………………………………………………………………………………………. 23-3
Propeller shaft tightening torque ………………………………………………………………………………………………….. 23-4
Axle ………………………………………………………………………………………………………………………………………………. 23-5
Axle nut tightening procedure ……………………………………………………………………………………………………… 23-5
Differential gear adjustment procedure …………………………………………………………………………………………. 23-7
Function & Structure Torque Converter and Transmission Group ……………………………………………………………… 32-1
Torque Converter ……………………………………………………………………………………………………………………………. 32-2
Torque converter structure ………………………………………………………………………………………………………….. 32-2
Power flow path ………………………………………………………………………………………………………………………… 32-2
Torque multiplication ………………………………………………………………………………………………………………….. 32-2
Torque Converter Gear Pump …………………………………………………………………………………………………………… 32-3
Gear pump specifications …………………………………………………………………………………………………………… 32-3
Gear pump specifications …………………………………………………………………………………………………………… 32-4
Clutch combination ……………………………………………………………………………………………………………………. 32-5
Planetary gear …………………………………………………………………………………………………………………………… 32-5
Shift lever position ……………………………………………………………………………………………………………………… 32-5
QUAD switch operation ………………………………………………………………………………………………………………. 32-5
Gear train and number of teeth ……………………………………………………………………………………………………. 32-6
Clutch Pack ……………………………………………………………………………………………………………………………………. 32-9
Power Flow Path in the Transmission ………………………………………………………………………………………………. 32-10
Hydraulic System Diagram …………………………………………………………………………………………………………….. 32-15
Hydraulic Circuit Diagram ………………………………………………………………………………………………………………. 32-16
Oil Flow ……………………………………………………………………………………………………………………………………….. 32-17
Oil flow in the torque converter line …………………………………………………………………………………………….. 32-17
Oil flow to the clutch …………………………………………………………………………………………………………………. 32-17
T/C and T/M Oil Circulation …………………………………………………………………………………………………………….. 32-18
Modulator Valve Unit ……………………………………………………………………………………………………………………… 32-19
Interior schematic (example) ……………………………………………………………………………………………………… 32-21
Modulation Mechanism ………………………………………………………………………………………………………………….. 32-22
Modulator valve function …………………………………………………………………………………………………………… 32-22
Modulator valve operation …………………………………………………………………………………………………………. 32-24
Clutch Solenoid Valve ……………………………………………………………………………………………………………………. 32-25
For high/reverse and speed clutches ………………………………………………………………………………………….. 32-27
Check & Adjustment Torque Converter and Transmission Group ……………………………………………………………… 33-1
Clutch Oil Pressure and Time Lag …………………………………………………………………………………………………….. 33-2
Measuring clutch oil pressure ……………………………………………………………………………………………………… 33-2
Measuring clutch time lag …………………………………………………………………………………………………………… 33-4
Function & Structure Hydraulic Group ……………………………………………………………………………………………………. 42-1
Flushing Hydraulic Circuit ………………………………………………………………………………………………………………… 42-2
Purpose of flushing ……………………………………………………………………………………………………………………. 42-2
Cautions on Hydraulic Parts Replacement …………………………………………………………………………………………. 42-3
Hydraulic Circuit Symbols ………………………………………………………………………………………………………………… 42-4
Hydraulic lines …………………………………………………………………………………………………………………………… 42-4
Pumps & motors ………………………………………………………………………………………………………………………… 42-4
Cylinders ………………………………………………………………………………………………………………………………….. 42-4
Operation methods …………………………………………………………………………………………………………………….. 42-5
Pressure control valve ………………………………………………………………………………………………………………… 42-5
Flow control valve ……………………………………………………………………………………………………………………… 42-5
Directional control valve ……………………………………………………………………………………………………………… 42-6
Check valve ………………………………………………………………………………………………………………………………. 42-6
Miscellaneous hydraulic symbols …………………………………………………………………………………………………. 42-7
Hydraulic System Operation …………………………………………………………………………………………………………….. 42-8
Hydraulic system operation outline ………………………………………………………………………………………………. 42-8
Layout of Hydraulic Units ……………………………………………………………………………………………………………….. 42-10
Hydraulic Tank ………………………………………………………………………………………………………………………………. 42-11
Hydraulic tank specifications ……………………………………………………………………………………………………… 42-11
Hydraulic oil level check ……………………………………………………………………………………………………………. 42-11
Hydraulic tank (S/N 0101~0450, 9001~) ……………………………………………………………………………………… 42-12
Hydraulic tank (S/N 0451~) ……………………………………………………………………………………………………….. 42-15
Hydraulic Pump …………………………………………………………………………………………………………………………….. 42-17
Loading and pilot and brake pump ……………………………………………………………………………………………… 42-19
Pump specifications …………………………………………………………………………………………………………………. 42-19
Steering pump (S/N 0101~0258, 9001~9065) ……………………………………………………………………………… 42-20
Pump specifications …………………………………………………………………………………………………………………. 42-20
Steering pump (S/N 0259~0398, 9066~) …………………………………………………………………………………….. 42-21
Pump specifications …………………………………………………………………………………………………………………. 42-21
Steering pump (S/N 0399~) ………………………………………………………………………………………………………. 42-23
Pump specifications …………………………………………………………………………………………………………………. 42-23
Hydraulic pump principle …………………………………………………………………………………………………………… 42-25
Hydraulic pump wear plate ………………………………………………………………………………………………………… 42-26
Hydraulic pump bushing lubrication ……………………………………………………………………………………………. 42-26
Hydraulic Cylinder …………………………………………………………………………………………………………………………. 42-27
Boom cylinder …………………………………………………………………………………………………………………………. 42-27
Bucket cylinder ………………………………………………………………………………………………………………………… 42-28
Steering cylinder ……………………………………………………………………………………………………………………… 42-29
Hydraulic cylinder specifications ………………………………………………………………………………………………… 42-30
Loading System ……………………………………………………………………………………………………………………………. 42-31
Reducing Valve (for Pilot Pressure) …………………………………………………………………………………………………. 42-32
Pilot Valve (S/N 0101~0290, 9001~9080) …………………………………………………………………………………………. 42-33
Pilot valve (S/N 0291~0408, 9081~) ………………………………………………………………………………………………… 42-38
Pilot valve (S/N 0409~0410) …………………………………………………………………………………………………………… 42-43
Pilot valve (S/N 0411~) ………………………………………………………………………………………………………………….. 42-48
Multiple Control Valve (KML35A/2T003B) …………………………………………………………………………………………. 42-53
Multiple control valve specifications ……………………………………………………………………………………………. 42-54
Multiple control valve main relief valve ……………………………………………………………………………………….. 42-55
Multiple control valve overload relief valve ………………………………………………………………………………….. 42-57
Multiple control valve make-up valve ………………………………………………………………………………………….. 42-59
Multiple control valve bucket spool …………………………………………………………………………………………….. 42-60
Multiple control valve boom spool ………………………………………………………………………………………………. 42-62
Adapter (Orifice) ……………………………………………………………………………………………………………………………. 42-65
Vibration Damper (OPT) ………………………………………………………………………………………………………………… 42-66
Vibration damper hydraulic circuit ………………………………………………………………………………………………. 42-66
Vibration damper operation ……………………………………………………………………………………………………….. 42-67
Vibration damper hydraulic line ………………………………………………………………………………………………….. 42-76
Steering System ……………………………………………………………………………………………………………………………. 42-77
Orbitrol® ………………………………………………………………………………………………………………………………………. 42-78
Orbitrol® specification ………………………………………………………………………………………………………………. 42-78
Orbitrol® structure ……………………………………………………………………………………………………………………. 42-79
Orbitrol® operation …………………………………………………………………………………………………………………… 42-80
Orbitrol® feed-back mechanism operation …………………………………………………………………………………… 42-82
Steering speed and flow rate control ………………………………………………………………………………………….. 42-83
Hydraulic pump oil amount and steering force ……………………………………………………………………………… 42-83
Orbit rotor operation principle ……………………………………………………………………………………………………. 42-84
Steering Valve (KVS32-A4.0) ………………………………………………………………………………………………………….. 42-85
Steering valve operation …………………………………………………………………………………………………………… 42-88
Steering plunger variable throttle ……………………………………………………………………………………………….. 42-90
Steering valve flow control plunger …………………………………………………………………………………………….. 42-91
Steering valve main relief valve …………………………………………………………………………………………………. 42-92
Steering valve overload relief valve ……………………………………………………………………………………………. 42-94
Steering pilot circuit and its operation …………………………………………………………………………………………. 42-96
Stop Valve ……………………………………………………………………………………………………………………………………. 42-98
Stop valve function …………………………………………………………………………………………………………………. 42-100
Stop valve operation ………………………………………………………………………………………………………………. 42-101
Reducing Valve (for Orbitrol®) ……………………………………………………………………………………………………….. 42-102
Steering Line Filter ………………………………………………………………………………………………………………………. 42-103
Fan Motor System ……………………………………………………………………………………………………………………….. 42-105
Fan Motor Line (S/N 0101~0230) …………………………………………………………………………………………………… 42-106
Fan motor (GM30C) (S/N 0101~0230) ……………………………………………………………………………………… 42-108
Valve assembly (for fan motor) ………………………………………………………………………………………………… 42-109
Relief valve (two-step relief) …………………………………………………………………………………………………….. 42-110
Relief valve (two-step relief) operation ………………………………………………………………………………………..42-111
Solenoid valve (for fan speed control) ……………………………………………………………………………………….. 42-113
Fan Motor Line (S/N 0231~) ………………………………………………………………………………………………………….. 42-114
Fan motor (GM30C) (S/N 0231~0313) ……………………………………………………………………………………… 42-117
Fan motor (GM30W) (S/N 0314~0398) ……………………………………………………………………………………… 42-118
Fan motor (FM30) (S/N 0399~) ………………………………………………………………………………………………… 42-120
Thermo sensing valve …………………………………………………………………………………………………………….. 42-122
Fan motor relief valve assembly ………………………………………………………………………………………………. 42-124
Fan motor relief valve ……………………………………………………………………………………………………………… 42-125
Fan motor check valve (make-up valve) ……………………………………………………………………………………. 42-125
Fan Motor Line (S/N 9001~9010) …………………………………………………………………………………………………… 42-126
Fan motor (GM30C) (S/N 9001~9010) ……………………………………………………………………………………… 42-128
Valve assembly (for fan motor) ………………………………………………………………………………………………… 42-129
Relief valve (two-step relief) …………………………………………………………………………………………………….. 42-130
Relief valve (two-step relief) operation ………………………………………………………………………………………. 42-131
Solenoid valve (for fan speed control) ……………………………………………………………………………………….. 42-133
Fan Motor Line (S/N 9011~) ………………………………………………………………………………………………………….. 42-134
Fan motor (GM30C) (S/N 9011~9065) ……………………………………………………………………………………… 42-137
Fan motor (GM30W) (S/N 9066~) ……………………………………………………………………………………………. 42-138
Thermo sensing valve …………………………………………………………………………………………………………….. 42-140
Fan motor relief valve assembly ………………………………………………………………………………………………. 42-142
Fan motor relief valve …………………………………………………………………………………………………………….. 42-143
Fan motor check valve (make-up valve) ……………………………………………………………………………………. 42-143
Emergency Steering (for Europe) ………………………………………………………………………………………………….. 42-144
Emergency steering operation condition ……………………………………………………………………………………. 42-144
Emergency steering line oil flow ………………………………………………………………………………………………. 42-144
Emergency steering motor and pump ……………………………………………………………………………………….. 42-146
Check & Adjustment Hydraulic Group ……………………………………………………………………………………………………. 43-1
Loading/Steering Circuit Relief Valve …………………………………………………………………………………………………. 43-2
Loading circuit relief valve setting pressures …………………………………………………………………………………. 43-2
Steering circuit relief valve setting pressures …………………………………………………………………………………. 43-7
Hydraulic Cylinder …………………………………………………………………………………………………………………………. 43-12
Cylinder natural drift …………………………………………………………………………………………………………………. 43-12
Stop Valve ……………………………………………………………………………………………………………………………………. 43-14
Stop valve adjustment procedure ………………………………………………………………………………………………. 43-14
Fan Revolution (S/N 0101~) …………………………………………………………………………………………………………… 43-15
Fan maximum revolution measurement (S/N 0101~0230) …………………………………………………………….. 43-15
Fan maximum revolution measurement (S/N 0231~) ……………………………………………………………………. 43-17
Fan Revolution (S/N 9001~) …………………………………………………………………………………………………………… 43-19
Fan maximum revolution measurement (S/N 9001~9010) …………………………………………………………….. 43-19
Fan maximum revolution measurement (S/N 9011~) ……………………………………………………………………. 43-21
Function & Structure Brake Group ………………………………………………………………………………………………………… 52-1
Brake System Outline ……………………………………………………………………………………………………………………… 52-2
Service brake ……………………………………………………………………………………………………………………………. 52-2
Parking brake ……………………………………………………………………………………………………………………………. 52-2
Auto brake ……………………………………………………………………………………………………………………………….. 52-2
Adjustment of axle internal pressure …………………………………………………………………………………………….. 52-2
Brake Units Layout ………………………………………………………………………………………………………………………….. 52-3
Unloader Valve ……………………………………………………………………………………………………………………………….. 52-4
Unloader valve operation ……………………………………………………………………………………………………………. 52-6
Valve Unit ………………………………………………………………………………………………………………………………………. 52-7
Reducing Valve ………………………………………………………………………………………………………………………………. 52-8
Brake Accumulator Line …………………………………………………………………………………………………………………… 52-9
Brake circuit check valve …………………………………………………………………………………………………………… 52-12
Brake Valve ………………………………………………………………………………………………………………………………….. 52-13
Brake main valve (left pedal) ……………………………………………………………………………………………………… 52-13
Brake pilot valve (right pedal) …………………………………………………………………………………………………….. 52-15
Brake valve performance chart ………………………………………………………………………………………………….. 52-17
Brake valve outline …………………………………………………………………………………………………………………… 52-20
Stop Lamp Pressure Switch ……………………………………………………………………………………………………………. 52-22
Pressure switch (for stop lamp) ………………………………………………………………………………………………….. 52-22
Pressure switch (for declutch) ……………………………………………………………………………………………………. 52-23
Service Brake ……………………………………………………………………………………………………………………………….. 52-24
Service brake operation ……………………………………………………………………………………………………………. 52-24
Service brake friction plate ………………………………………………………………………………………………………… 52-25
Service brake steel plate …………………………………………………………………………………………………………… 52-25
Service brake piston …………………………………………………………………………………………………………………. 52-26
Service brake pedal stroke adjusting mechanism (S/N 0101~0311, 9001~9095) ……………………………… 52-28
Brake circuit air bleeding procedure ……………………………………………………………………………………………. 52-30
Parking Brake ……………………………………………………………………………………………………………………………….. 52-32
Parking brake operation chart ……………………………………………………………………………………………………. 52-32
Parking Brake (Rear) …………………………………………………………………………………………………………………….. 52-33
Parking brake solenoid valve (rear) ……………………………………………………………………………………………. 52-34
Parking brake manual release procedure (rear) …………………………………………………………………………… 52-35
Parking brake spring chamber …………………………………………………………………………………………………… 52-37
Parking Brake (Front) (for Europe only) ……………………………………………………………………………………………. 52-38
Parking brake solenoid valve (front) ……………………………………………………………………………………………. 52-39
Front parking brake auto adjuster mechanism ……………………………………………………………………………… 52-40
Parking brake line air bleeding procedure (front parking) ………………………………………………………………. 52-41
Parking brake manual release procedure (front) …………………………………………………………………………… 52-42
Auto Brake …………………………………………………………………………………………………………………………………… 52-43
Auto brake circuit …………………………………………………………………………………………………………………….. 52-43
Auto brake operation set value ………………………………………………………………………………………………….. 52-43
Shuttle valve …………………………………………………………………………………………………………………………… 52-45
Check & Adjustment Brake Group ………………………………………………………………………………………………………… 53-1
Brake Circuit Oil Pressure ………………………………………………………………………………………………………………… 53-2
Unloader valve setting pressure ………………………………………………………………………………………………….. 53-2
Accumulator circuit pressure ……………………………………………………………………………………………………….. 53-4
Brake valve oil pressure ……………………………………………………………………………………………………………… 53-6
Service Brake …………………………………………………………………………………………………………………………………. 53-8
Service brake performance check ……………………………………………………………………………………………….. 53-8
Service brake friction plate wear measurement ……………………………………………………………………………… 53-9
Parking Brake ………………………………………………………………………………………………………………………………. 53-12
Parking brake performance check ……………………………………………………………………………………………… 53-12
Parking brake clearance adjustment …………………………………………………………………………………………… 53-14
Function & Structure Electrical Group ……………………………………………………………………………………………………. 62-1
How to Use Electrical Wiring Diagram ……………………………………………………………………………………………….. 62-2
Utilisation des schémas des câblages électriques (FRANÇAIS) ……………………………………………………………. 62-3
Verwendung des elektrischen Schaltplans (DEUTSCH) ……………………………………………………………………….. 62-4
Modalità di utilizzo dello schema dei collegamenti elettrici (ITALIANO) …………………………………………………… 62-5
Cómo utilizar un Diagrama de Alambrado Eléctrico (ESPAÑOL) …………………………………………………………… 62-6
Como Utilizar o Diagrama de Ligações Eléctricas (PORTUGUÊS) ………………………………………………………… 62-7
Electrical Cable Color Codes ……………………………………………………………………………………………………………. 62-8
Electrical Circuit Symbols ………………………………………………………………………………………………………………… 62-9
Sensor Mount ……………………………………………………………………………………………………………………………….. 62-10
Fuse ……………………………………………………………………………………………………………………………………………..62-11
Fuse box ………………………………………………………………………………………………………………………………… 62-12
Fusible link ……………………………………………………………………………………………………………………………… 62-13
Engine Start Circuit ……………………………………………………………………………………………………………………….. 62-15
Engine start circuit diagram (S/N 0101~0360, 9001~) …………………………………………………………………… 62-15
Neutral starter …………………………………………………………………………………………………………………………. 62-15
Engine start circuit diagram (S/N 0361~) …………………………………………………………………………………….. 62-16
Neutral starter …………………………………………………………………………………………………………………………. 62-17
Starter switch …………………………………………………………………………………………………………………………… 62-18
Battery relay ……………………………………………………………………………………………………………………………. 62-19
Alternator I terminal wire …………………………………………………………………………………………………………… 62-19
Diode unit ……………………………………………………………………………………………………………………………….. 62-20
Neutral relay ……………………………………………………………………………………………………………………………. 62-20
Magnet switch …………………………………………………………………………………………………………………………. 62-21
Voltage relay …………………………………………………………………………………………………………………………… 62-22
Power Generating/Charging Circuit …………………………………………………………………………………………………. 62-23
Alternator ………………………………………………………………………………………………………………………………… 62-23
ECM (Engine Controller) ………………………………………………………………………………………………………………… 62-24
Function of ECM ……………………………………………………………………………………………………………………… 62-24
Connection diagram …………………………………………………………………………………………………………………. 62-24
Monitor lamp test ……………………………………………………………………………………………………………………… 62-25
Failure diagnosis ……………………………………………………………………………………………………………………… 62-26
Quantum fault code information …………………………………………………………………………………………………. 62-31
Accelerator pedal …………………………………………………………………………………………………………………….. 62-38
Accelerator pedal …………………………………………………………………………………………………………………….. 62-40
Transmission Control Circuit and Monitor Circuit (S/N 0101~0358, 9001~) …………………………………………… 62-42
Controller ………………………………………………………………………………………………………………………………… 62-42
Controller connection diagram …………………………………………………………………………………………………… 62-44
Controller function ……………………………………………………………………………………………………………………. 62-45
Transmission Control Circuit and Monitor Circuit (S/N 0359~) ……………………………………………………………… 62-64
Machine control unit (MCU) ………………………………………………………………………………………………………. 62-64
Machine control unit (MCU) connection diagram ………………………………………………………………………….. 62-66
Emergency steering function (For Europe only) ……………………………………………………………………………. 62-68
Monitoring System ………………………………………………………………………………………………………………………… 62-69
Monitor controller …………………………………………………………………………………………………………………….. 62-69
Monitor controller connection diagram ………………………………………………………………………………………… 62-70
Monitor controller function …………………………………………………………………………………………………………. 62-71
Instrument Panel and Switch ………………………………………………………………………………………………………….. 62-74
Instrument panel ……………………………………………………………………………………………………………………… 62-74
Instrument panel rear surface ……………………………………………………………………………………………………. 62-75
Gauge circuit …………………………………………………………………………………………………………………………… 62-76
Tachometer circuit ……………………………………………………………………………………………………………………. 62-77
Fuel gauge circuit …………………………………………………………………………………………………………………….. 62-78
Electrical Detent Circuit ………………………………………………………………………………………………………………….. 62-80
Bucket leveler …………………………………………………………………………………………………………………………. 62-80
Boom kick-out (option) ……………………………………………………………………………………………………………… 62-81
Detent solenoid ……………………………………………………………………………………………………………………….. 62-82
Diode …………………………………………………………………………………………………………………………………………… 62-83
Diode check method ………………………………………………………………………………………………………………… 62-84
Caution for diode check method ………………………………………………………………………………………………… 62-84
Surge voltage and surge suppression diodes ………………………………………………………………………………. 62-86
Diagnostic System ………………………………………………………………………………………………………………………… 62-87
Diagnostic system flow …………………………………………………………………………………………………………….. 62-87
Monitor controller …………………………………………………………………………………………………………………….. 62-91
Diagnostic failure history indication and deletion ………………………………………………………………………….. 62-94
Diagnostic switch …………………………………………………………………………………………………………………….. 62-96
MODM (S/N 0361~) ………………………………………………………………………………………………………………………. 62-97
MODM function ……………………………………………………………………………………………………………………….. 62-97
Monitor Changeover ………………………………………………………………………………………………………………… 62-97
MODM: Input/output monitor – Input/output signal correspondence table ………………………………………. 62-104
Check & Adjustment Electrical Group ……………………………………………………………………………………………………. 63-1
Cautions Regarding Electric Circuit Check …………………………………………………………………………………………. 63-2
Disconnecting or reinstalling connector ………………………………………………………………………………………… 63-2
How to attach the probes of the circuit tester …………………………………………………………………………………. 63-4
Electrical Transmission Control System Troubleshooting Flowchart ………………………………………………………. 63-5
Standard troubleshooting flowchart ………………………………………………………………………………………………. 63-5
Transmission Controller Abnormal Operation Judgment ………………………………………………………………………. 63-6
Transmission controller check …………………………………………………………………………………………………….. 63-6
Transmission controller LED indicator ………………………………………………………………………………………….. 63-8
Electrical Circuit Check ………………………………………………………………………………………………………………….. 63-10
Shift lever input electrical circuit check ……………………………………………………………………………………….. 63-10
Inching (declutch) input electrical circuit check …………………………………………………………………………….. 63-12
QUAD switch input electrical circuit check …………………………………………………………………………………… 63-14
Machine speed sensor input electrical circuit check ……………………………………………………………………… 63-15
Clutch solenoid valve output electrical circuit check ……………………………………………………………………… 63-16
Modulator valve output electrical circuit check ……………………………………………………………………………… 63-18
Check output circuit wiring ………………………………………………………………………………………………………… 63-19
Neutral relay electrical circuit check ……………………………………………………………………………………………. 63-20
Parking brake electrical circuit check ………………………………………………………………………………………….. 63-21
Auto brake electrical circuit check ………………………………………………………………………………………………. 63-24
Gauge circuit electrical circuit check …………………………………………………………………………………………… 63-26
Fuel level gauge electrical circuit check ………………………………………………………………………………………. 63-28
Shift Lever ……………………………………………………………………………………………………………………………………. 63-30
Operation force measurement …………………………………………………………………………………………………… 63-30
Function & Structure Operator Station Group …………………………………………………………………………………………. 72-1
Cabin …………………………………………………………………………………………………………………………………………….. 72-2
Glass ……………………………………………………………………………………………………………………………………….. 72-3
Wiper mount ……………………………………………………………………………………………………………………………… 72-6
Wiper motor ………………………………………………………………………………………………………………………………. 72-7
Operator Seat …………………………………………………………………………………………………………………………………. 72-9
Steering and Transmission Shift Lever ……………………………………………………………………………………………… 72-10
Tilt case ………………………………………………………………………………………………………………………………….. 72-11
Column shaft …………………………………………………………………………………………………………………………… 72-12
Shift lever ……………………………………………………………………………………………………………………………….. 72-12
Air Conditioner ……………………………………………………………………………………………………………………………… 72-13
Air conditioner components ……………………………………………………………………………………………………….. 72-13
Air conditioner structure ……………………………………………………………………………………………………………. 72-14
Cooling mechanism ………………………………………………………………………………………………………………….. 72-19
Cooling circuit ………………………………………………………………………………………………………………………….. 72-21
Electrical circuit ……………………………………………………………………………………………………………………….. 72-22
Air conditioner functions of components ……………………………………………………………………………………… 72-23
Charge of refrigerant ………………………………………………………………………………………………………………… 72-50
Air conditioner troubleshooting …………………………………………………………………………………………………… 72-65
Check & Adjustment Operator Station Group …………………………………………………………………………………………. 73-1
Air Conditioner ……………………………………………………………………………………………………………………………….. 73-2
Adjustment of lubricating oil quantity when components of air conditioner are replaced ………………………. 73-2
Adjustment of air gap (between hub and rotor) in compressor magnetic clutch ………………………………….. 73-5
Parts to be replaced periodically ………………………………………………………………………………………………….. 73-6
Cross-Section Drawing & Diagrams ………………………………………………………………………………………………………. 92-1
Axle Assembly ……………………………………………………………………………………………………………………………….. 92-2
Torque Converter and Transmission ………………………………………………………………………………………………….. 92-3
Loading/Steering Hydraulic Line (S/N 0101~0230) ………………………………………………………………………………. 92-4
Loading/Steering Hydraulic Line (S/N 0231~) ……………………………………………………………………………………… 92-5
Loading/Steering Hydraulic Circuit (S/N 9001~9010) …………………………………………………………………………… 92-6
Loading/Steering Hydraulic Circuit (S/N 9011~) …………………………………………………………………………………… 92-7
Brake Circuit ………………………………………………………………………………………………………………………………….. 92-8
Electrical Wiring Diagram (1/2) (S/N 0101~0237) ………………………………………………………………………………… 92-9
Electrical Wiring Diagram (2/2) (S/N 0101~0237) ………………………………………………………………………………. 92-10
Electrical Wiring Diagram (1/2) (S/N 0238~0242) ………………………………………………………………………………..92-11
Electrical Wiring Diagram (2/2) (S/N 0238~0242) ………………………………………………………………………………. 92-12
Electrical Wiring Diagram (1/2) (S/N 0243~0358) ………………………………………………………………………………. 92-13
Electrical Wiring Diagram (2/2) (S/N 0243~0358) ………………………………………………………………………………. 92-14
Electrical Wiring Diagram (1/3) (S/N 0359~) ……………………………………………………………………………………… 92-15
Electrical Wiring Diagram (2/3) (S/N 0359~) ……………………………………………………………………………………… 92-16
Electrical Wiring Diagram (3/3) (S/N 0359~) ……………………………………………………………………………………… 92-17
Electrical Wiring Diagram (1/2) (S/N 9001~9010) ………………………………………………………………………………. 92-18
Electrical Wiring Diagram (2/2) (S/N 9001~9010) ………………………………………………………………………………. 92-19
Electrical Wiring Diagram (1/2) (S/N 9011~9064) ………………………………………………………………………………. 92-20
Electrical Wiring Diagram (2/2) (S/N 9011~9064) ………………………………………………………………………………. 92-21
Electrical Wiring Diagram (1/2) (S/N 9065~9080) ………………………………………………………………………………. 92-22
Electrical Wiring Diagram (2/2) (S/N 9065~9080) ………………………………………………………………………………. 92-23
Electrical Wiring Diagram (1/2) (S/N 9081~) ……………………………………………………………………………………… 92-24
Electrical Wiring Diagram (2/2) (S/N 9081~) ……………………………………………………………………………………… 92-25
Electrical wiring diagram abbreviation chart (S/N 0101~0360, 9001~) ………………………………………………….. 92-26
Electrical wiring diagram abbreviation chart (S/N 0361~) ……………………………………………………………………. 92-27
Electrical Wiring Diagram (CAB) ……………………………………………………………………………………………………… 92-28
Electrical Connection Diagram (S/N 0101~0237) ………………………………………………………………………………. 92-30
Electrical Connection Diagram (S/N 0238~0252) ………………………………………………………………………………. 92-31
Electrical Connection Diagram (S/N 0253~0360) ………………………………………………………………………………. 92-32
Electrical Connection Diagram (S/N 0361~) ……………………………………………………………………………………… 92-33
Electrical Connection Diagram (S/N 9001~9064) ………………………………………………………………………………. 92-34
Electrical Connection Diagram (S/N 9065~) ……………………………………………………………………………………… 92-35
Electrical Equipment Layout …………………………………………………………………………………………………………… 92-36
Electrical Circuit Diagram (Cabin Air Conditioner) ……………………………………………………………………………… 92-55
Electrical Wiring Diagram (Cabin Air Conditioner) ……………………………………………………………………………… 92-56
Equipment Operation Table (Cabin Air Conditioner) …………………………………………………………………………… 92-57
Description:
Hitachi ZW370 G Wheel Loader Operational Principle Technical Manual
- Foreword To ensure good machine performance, reduce failures or problems, and prolong the service life of each component, it is necessary to operate the machine as is directed in the Operator and Maintenance Manual
- . To effectively diagnose and repair the machine, it is important to follow the guidelines laid out in this Shop Manual. General Information Function and structure For the engine, refer to the engine Shop Manual provided by the engine manufacturer.
- The purpose of this manual is to provide information on the product and the correct maintenance and repair methods. Please read this manual to ensure correct troubleshooting and good repair service. This manual will be periodically reviewed and revised for more satisfactory content. If you have any opinion or requests, please inform us.
Please Note:
- This is the SAME exact manual used by your dealers to fix your vehicle.
- The same can be yours in the next 2-3 mins as you will be directed to the download page immediately after paying for the manual.
- Any queries / doubts regarding your purchase, please feel free to contact [email protected]
Emir Boden –
Good product highly recommended seller