Technical Manual Hitachi ZW370-6 Wheel Loader | TONHJ40-EN-01

Technical Manual Hitachi ZW370-6 Wheel Loader TONHJ40-EN-01 (Preview)

TONHJ40-EN-01
CONTENTS

INTRODUCTION
SYMBOL AND ABBREVIATION
SECTION AND GROUP CONTENTS
SECTION 1GENERAL
Group 1 Specifications
Specifications
Weight of Main Components
Group 2 Component Layout
Main Component (Overview)
Main Component
Electric Component Layout (Overview)
Electrical System (Cab)
Electrical System (Relays)
Electrical System (Around Hydraulic Oil Tank)
Electrical System (Around Fuel Tank)
Engine
Aftertreatment Device/Air Cleaner
Hydraulic Pump
Transmission and Torque Converter Assembly
Multiple Control Valve
Brake Charge Valve (Unloader Valve)
Combination Valve (Brake Manifold Valve)
Flow Regulator Valve
Steering Valve
Ride Control Valve
Fuel Priming Pump (US Option)
Emergency (Secondary) Steering Group
Joystick Steering Hydraulic Component Layout (Electric JSS)
Joystick Steering Cab Components
Group 3 Component Specifications
Engine
Engine Accessories
Hydraulic Component
Electrical Component
SECTION 2 SYSTEM
Group 1 Controller
Outline
CAN Circuit
Group 2 Control System
Outline
Engine Control
Pump Control
Transmission Control
Fan Control, Valve Control
Other Controls
JSS Control System (Electric Type)
Combined Electric and Hydraulic Control Circuit
Group 3 Engine System
Outline
Engine Sensors
Fuel Injection Control
EGR Control
Preheating Control
Variable Turbocharger Control
Urea SCR System
Engine Output Restriction (Inducement)
Aftertreatment Device
Aftertreatment Device Regeneration Control
Group 4 Hydraulic System
Outline
Pilot Circuit
Brake Priority Circuit
Service Brake Circuit
Parking Brake Circuit
Auto Brake Circuit
Lift Arm / Bucket Operation Control Circuit
Fan Circuit
Main Circuit
Steering Priority Circuit
Steering Operation Control Circuit
Neutral Circuit
Flow Rate Control Circuit
Relief Circuit
Other Circuits
Pump Control Circuit
Parallel Circuit Flow Rate Control
Single Operation Circuit
Combined Operation Circuit
Ride Control Circuit
Emergency (Secondary) Steering Circuit
Joystick Steering Hydraulic System
Group 5 Electrical System
Outline
Main Circuit
Electric Power Circuit (Key Switch: OFF)
CAN Circuit
Accessory Circuit (Key Switch: ACC)
Starting Circuit (Key Switch: START)
Neutral Engine Start Circuit
Charging Circuit (Key Switch: ON)
Surge Voltage Prevention Circuit
Pilot Shut-Off Circuit (Key Switch: ON)
Auto Shut-Down (Idling Stop) Circuit
Engine Stop Circuit
Monitor Circuit
Air Conditioner Circuit
Steering Column Monitor Circuit
Head Light Circuit
Hazard Light Circuit (Key Switch: OFF)
Turn Signal Light Circuit
Horn Circuit (Key Switch: OFF)
Reverse Light/Buzzer Circuit
Brake Light Circuit
Parking Brake Circuit
Accessory Circuit
Work Light Circuit
Wiper Circuit
Cab Light Circuit
JSS Electrical System
Outline
SECTION 3 COMPONENT OPERATION
Group 1 Pump Device
Hydraulic Pump Outline
Main Hydraulic Pump
Regulator
Accessory Pump
Pump Delivery Pressure Sensor
Group 2 Control Valve
Outline
Hydraulic Circuit
Main Relief Valve
Main Relief Valve Operation
Overload Relief Valve (with Make-Up Function)
Overload Relief Valve Operation
Make-up Valve Operation
Bleed-Off Compensation Spool
Bleed-Off Compensator
Bucket Spool
Lift Arm (Boom) Spool
Lift Arm Flow Rate Control Valve
Ride Control
Pump Control Valve (Negative Control Relief Valve)
Group 3 Cooling Fan System
Cooling Fan System Layout
Fan Pump (Accessory Pump)
Fan Motor
Fan Control Valve
Group 4 Steering Pilot Valve
Outline
Location
Overview
Steering Pilot Valve Specifications
Structure
Operation
Joystick Steering Control Valve
Group 5 Steering Valve
Outline
Steering Valve Main Component
Operation
Steering Valve Meter-In Compensator
Steering Main Relief Valve
Steering Overload Relief Valve
Steering Spool Variable Orifice
Steering Pilot Circuit and Its Operation
Flow Amplifier Notch and Pilot Orifice
Group 6 Pilot Valve
Outline (Fingertip Control Type Pilot Valve for Front Attachment)
Operation
Electromagnetic Detent
Outline (Joystick Type Pilot Valve for Front Attachment)
Operation
Electromagnetic Detent
Group 7 Charging Circuit
Outline
Brake Charge Valve (Unloader Valve)
Combination Valve (Manifold Block)
Combination Valve (Solenoid Valve Block)
Combination Valve (Reducing Valve Block)
Service Brake Accumulator
Group 8 Drive Unit
Outline
Torque Converter (Lock-Up)
Transmission
Operation of Transmission
Clutch Pack
Power Flow Path in the Transmission
Transmission Control Valve
Drive Unit Circuit
Group 9 Axle
Outline
Rear Axle Assembly
Front Axle Assembly
Differential
Torque Proportioning Differential (TPD)
Limited Slip Differential (LSD)
Service Brake
Parking Brake
Parking Brake Manual Release
Group 10 Brake Valve
Outline
Service Brake Operation
Bleed Air from Service Brake Circuit
Pressure Switch (for Stop Lamp)
Pressure Sensor (for Declutch)
Auto Brake Operation
Bleed Air from Auto Brake Circuit
Group 11 DEF Supply System
System Overview
DEF
DEF Tank
Hose Urea
DEF Sensor Unit
DEF Supply Module
Coolant Line
Coolant Control Valve Air Bleeding Procedure
Group 12 Others
Propeller Shaft
Flow Regulator Valve
Emergency (Secondary) Steering Pump
Ride Control Valve
Ride Control Accumulator
Steering Accumulator
Priority Hammer Valve
Axle Oil Cooler
SERVICE MANUAL REVISION REQUEST FORM