Technical Manual Hitachi ZW20 Wheel Loader | T4EJ-E-00

Technical Manual Hitachi ZW20 Wheel Loader T4EJ-E-00 (Preview)

COVER
INTRODUCTION
SAFETY
SECTION AND GROUPCONTENTS
SECTION 1 GENERAL
Group 1 Specification
Specifications
Group 2 Component Specifications
Engine
HST Pump
Gear Pump
Orbitroll
Group 3 Component Layout
Main Component (Overview)
Main Component (Power Line)
Hydraulic System (Overview)
Electrical System (Overview)
Electrical System (Monitor Panel)
Engine
HST Pump
HST Motor
Reduction
Control Valve
SECTION 2 SYSTEM
Group 1 Fuel System
Outline
Group 2 Hydraulic System
Outline
HST Circuit
HST Oil Filter
Brake Circuit
Steering Circuit
Main Circuit Diagram
Group 3 Electrical System
Outline
Electrical Circuit Diagram
Power Circuit
Electric Power Circuit (Key Switch: OFF)
Preheat Circuit (Key Switch: HEAT)
Preheat Circuit (Key Switch: START)
Charging Circuit
Starting Circuit
Stop Circuit
Monitor Indicator Circuit
Gauge Circuit
Travel Circuit
Parking Brake Circuit
Light Circuit
Horn Circuit
Auto Leveler Circuit
SECTION 3 COMPONENT OPERATION
Group 1 HST Pump
HST Circuit
HST Pump
High-Pressure Relief Valve
Low-Pressure Relief Valve
HST Pump Characteristic Curve
DA Control
Displacement Angle Return Force and Advance
Inching Valve
Automatic Transmission Function
Torque Control Function
Group 2 HST Motor
HST Motor
Constand Control (HA Control)
Group 3 Axle
Axle
Differential Assembly
Final Drive Assembly
Group 4 Brake
Service Brake
Parking Brake
Towing Machine Method (In Emergency)
Wet Type Brake Assembly in Reduction Gear
Master Cylinder
Group 5 Orbitroll
Power Steering (Orbitroll)
Operation in Neutral
At Right Swing Operation
At Relief Valve Operation
Group 6 Control Valve
Control Valve
Operation
Operation of Tilt Section
Operation of Lift Section and Spool
Detent Operation
Relief Valve
Anti-Void Valve
Group 7 Main Pump
Main Pump
Return Filter
SECTION 4 OPERATIONAL PERFORMANCE TEST
Group 1 Introduction
Operational Performance Tests
Preparation for Performance Tests
Group 2 Standard
Standard
Group 3 Engine Test
ACT. Eng Speed
Engine Compression Pressure
Valve Clearance
Nozzle
Group 4 Wheel Loader Test
Travel Speed
Service Brake Control Function
Parking Brake Control Function
Hydraulic Cylinder Cycle Time
Hydraulic Cylinder Drift Check
Control Lever Operating Force
Control Lever Stroke
Main Relief Set Pressure
Steering Relief Pressure
DA Control Pressure in HST Pump
Low Relief Pressure in HST Pump
High Relief Pressure in HST Pump
SECTION 5 TROUBLESHOOTING
Group 1 Diagnosing Procedure
Introduction
Diagnosing Procedure
Group 2 Failure List
Trouble Symptoms Regarding the Engine
Trouble Symptoms Regarding the Vehicle Performance
Group 3 Engine
Group 4 Vehicle Performance
SERVICE MANUAL REVISION REQUEST FORM