Hitachi ZW20 Wheel Loader Service Manual

Hitachi ZW20 Wheel Loader Service Manual

$33.00

Service Manual (Troubleshooting) : Vol. No.T4EJ-E-00 (264 Pages)
Workshop Manual : Vol. No.W4EJ-E-00 (220 Pages)

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  • Description
  • Table of Content
  • Reviews (0)

Description

Hitachi ZW20 Wheel Loader Service Manual

The manual is applicable for the Hitachi ZW20 Wheel Loader Model

Format: PDF
Language: English
Service Manual consists of the following:

For Model ZW20 as mentioned above:

Service Manual (Troubleshooting) : Vol. No.T4EJ-E-00 (264 Pages)
Workshop Manual : Vol. No.W4EJ-E-00 (220 Pages)

Table of Content of the Workshop Manual

SECTION 1 GENERAL
Group 1 Precautions for Disassembling
and Assembling
Group 2 Tightening
Group 3 Painting
SECTION 2 BODY
Group 1 Control Valve
Group 2 Main Pump
SECTION 3 TRAVEL SYSTEM
Group 1 Cab
Group 2 HST Pump
Group 3 HST Motor
Group 4 Reduction Gear
Group 5 Axle
Group 6 Master Cylinder
Group 7 Power Steering
Group 8 Steering Cylinder
SECTION 4 FRONT ATTACHMENT
Group 1 Front Attachment
Group 2 Cylinder

Table of Content of the Technical Manual

SECTION 1 GENERAL
Group 1 Specification
Group 2 Component Specifications
Group 3 Component Layout
SECTION 2 SYSTEM
Group 1 Fuel System
Group 2 Hydraulic System
Group 3 Electrical System
SECTION 3 COMPONENT OPERATION
Group 1 HST Pump
Group 2 HST Motor
Group 3 Axle
Group 4 Brake
Group 5 Orbitroll
Group 6 Control Valve
Group 7 Main Pump
SECTION 4 OPERATIONAL PERFORMANCE TEST
Group 1 Introduction
Group 2 Standard
Group 3 Engine Test
Group 4 Wheel Loader Test
SECTION 5 TROUBLESHOOTING
Group 1 Diagnosing Procedure
Group 2 Failure List
Group 3 Engine
Group 4 Component Layout

 Manual guide composition

Hitachi ZAXIS ZW20 service manual consists of the Troubleshooting and the Workshop Manual.

  • Information included in the Service 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.

DA Valve

Hitachi ZW20The gear pump is coaxially connected to HST pump for the charge and pilot.
The gear pump flow rate is changed in proportion to the engine speed.
All of flow rate flows to the charge circuit through the orifice of DA valve.
DA valve decreases charge pressure to generate control pressure by using the signal based on the pressure difference caused by the flow rate change between the front and rear of orifice.
Therefore, the pump displacement angle is controlled by pressure almost in proportion to the engine speed.
The charging pump delivery flow rate in proportion to the engine speed flows to charging circuit [C] through port [A].
DA valve decreases charging circuit [C] pressure to generate control pressure in control circuit [B] by using the signals based on the spring force by spring (4) and the pressure difference caused by the flow rate change between the front and rear of orifice (6).
1 – Control Cartridge
2 – O-Ring
3 – Set Screw
4 – Adjust Spring
5 – Differential Piston
6 – Orifice
A- DA Valve Primary side (From Charging Pump) B- DA Valve Secondary side (To Control Circuit) C- DA Valve Secondary side (To Charging Circuit) D- DA Valve Drain

 

 

  • Workshop Manual
  • SECTION 1 GENERAL INFORMATION
    Group 1 Precautions for disassembling and
    Assembling
    Group 2 Tightening Torque
    Group 3 Painting
    Group 4 Bleeding Air from Hydraulic Oil Tank
    SECTION 2 UPPERSTRUCTURE
    Group 1 Cab
    Group 2 Counterweight
    Group 3 Main Frame
    Group 4 Pump Device
    Group 5 Control Valve
    Group 6 Swing Device
    Group 7 Pilot Valve
    Group 8 Pilot Shut-Off Valve
    Group 9 Signal Control Valve
    Group 10 Travel Shockless Valve
    Group 11 Solenoid Valve
    Group 12 Pilot Relief Valve
    Group 13 Steering Valve
    Group 14 Brake Valve
    Group 15 Accumulator Charging Valve
    Group 16 Transmission Control Valve
    SECTION 3 UNDERCARRIAGE
    Group 1 Swing Bearing
    Group 2 Travel Motor
    Group 3 Center Joint
    Group 4 Transmission
    Group 5 Axle
    Group 6 Axle Lock Cylinder
    Group 7 Operate-Check Valve
    Group 8 Propeller Shaft
    SECTION 4 FRONT ATTACHMENT
    Group 1 Front Attachment
    Group 2 Cylinder
    Group 3 Hose-Rupture Safety Valve
    Group 4 Operate-Check Valve
    SECTION 5 ENGINE

    Service Manual (Troubleshooting)
    SECTION 4 OPERATIONAL PERFORMANCE
    TEST
    Group 1 Introduction
    Group 2 Standard
    Group 3 Engine Test
    Group 4 Excavator Test
    Group 5 Component Test
    Group 6 Adjustment
    SECTION 5 TROUBLESHOOTING
    Group 1 General
    Group 2 Component Layout
    Group 3 Troubleshooting A
    Group 4 Troubleshooting B
    Group 5 Troubleshooting C
    Group 6 Electrical System Inspection
    Group 7 ICX

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