Hitachi

Repair Manual

EX25-2

EX30-2 EX35-2

EX40-2 EX45-2

Contents

TECHNICAL MANUAL EX12-2 to EX45-2

INTRODUCTION

SECTION 1 GENERAL

Specifications

Specifications

Working Range-Transportation

Engine Specification

Interchangeability

Component Layout

Main Components

Electrical System (Overall System)

Electrical System (Relays)

Electrical System (Monitor and Switches)

SECTION 2 SYSTEM

Hydraulic System

Outline

Main Circuit

Pilot Circuit

SECTION 3 COMPONENOPERATION

Pump Device

Outline

Main Pump

Pilot Pump

Swing Device

Outline

Swing Motor

Parking Brake Changeover Valve

Valve Unit

Swing Reduction Gear

Control Valve

Outline

Hydraulic Circuit

Flow Combiner Valve

Main Relief Valve

Overload Relief Valve

Make-up Valve

Pilot Valve

Outline

Operation

Travel Device

Outline

Travel Motor

Travel Brake Valve

Travel Reduction Gear

Others (Upper structure)

Pilot Shut-Off Valve

Solenoid Valve

Others (Undercarriage)

Swing Bearing

Center Joint

Track Adjuster

SECTION 4 OPERATIONAL PERFORMANCE TEST

Introduction

Operational Performance Test

Preparation for Performance Tests

Engine Test

Engine Speed

Engine Compression Pressure

Valve Clearance

Nozzle Check

Injection Timing

Excavator Test

Travel Speed

Track Revolution Speed

Mist rack Check

Travel Motor Leakage

Swing Speed

Swing Function Drift Check

Swing Motor Leakage

Maximum Swing able Slant Angle

Swing Bearing Play

Hydraulic Cylinder Cycle Time

Dig Function Drift

Control Lever Operating Force

Control Lever and Pedal Stroke

Combined Boom Raise / Swing Function Ch

Component Test

Primary Pilot Pressure

Secondary Pilot Pressure

Main Relief Valve Set Pressure

Overload Relief Valve Set Pressure

Swing Motor Relief Valve Set Pressure

Swing Motor Drainage

Travel Motor Drainage

Standard

Operational Performance Standard

SECTION 5 TROUBLESHOOTING

Diagnosing Procedure

Introduction

Diagnosing Procedure

Troubleshooting A

Troubleshooting A Procedure

Engine system Troubleshooting

Actuator Operating System Troubleshooting

Front Attachment System Troubleshooting

Swing System Troubleshooting

Travel System Troubleshooting

Blade System Troubleshooting

Troubleshooting B

Troubleshooting Procedure

Malfunction of Coolant Temperature Gauge

Malfunction of Fuel Gauge

Malfunction of Alternator Indicator

Malfunction of Engine Oil Pressure Indicator

Malfunction of Overheat Indicator

Malfunction of Fuel Level Indicator

Malfunction of Air Filter Restriction Indicator

Malfunction of Buzzer

Malfunction of Hour Meter

Electrical System Inspection

Precautions For Inspection And Maintenance

Fuse Continuity Test

Batter Voltage Check

Voltage Check

Continuity Check

ATTACHED DIAGRAM LIST

EX12-2 EX15-2 EX18-2 Electrical Circuit (Type A)

EX12-2 EX15-2 EX18-2 Electrical Circuit (Type B)

EX22-2 EX25-2 EX30-2 EX35-2 EX40-2 EX45-2 Electrical Circuit (Type A)

EX22-2 EX25-2 EX30-2 EX35-2 EX40-2 EX45-2 Electrical Circuit (Type B)

WORKSHOP MANUAL EX12-2 to EX45-2

INTRODUCTION

SAFETY

SECTION 1 GENERAL INFORMATION

Precautions for Disassembling and Assembling

Precautions for Disassembling and Assembling

Tightening

Tightening Torque Specifications

Torque Circuit

Piping Joint

SECTION 2 UPPERSTRUCTURE

Canopy

Remove and Install Canopy

Counterweight

Remove and Install Counterweight

Pump Device

Remove and Install Pump Device

Disassemble and Assemble Pump Device

Maintenance Standard

Control Valve

Remove and Install Control Valve

Disassemble and Assemble Control Valve

Swing Device

Remove and Install Swing Device

Disassemble and Assemble Swing Reduction Gear

Disassemble and Assemble Swing Motor

Maintenance Standard

Pilot Valve

Remove and Install pilot Valve

Disassemble and Assemble Pilot Valve

Solenoid Valve

Disassemble and Assemble Travel Speed Change Solenoid Vavle

SECTION 3 UNDERCARRIAGE

Swing Bearing

Remove and Install Swing Bearing

Travel Device

Remove and Install Travel Device

Disassemble and Assemble Travel Device

Maintenance Standards

Center Joint

Remove and Install Center Joint

Disassemble and Assemble Center Joint

Track Adjuster

Remove and Install Track Adjuster

Front Idler

Remove and Install Front Idler

Maintenance Standards

Upper and Lower Rollers

Remove and Install Upper Roller

Remove and Install Lower Roller

Maintenance Standards

Track

Remove and Install Rubber Track

Maintenance Standard

SECTION 4 FRONATTACHMENT

Front Attachment

Remove and Install Front Attachment

Maintain Standards

Cylinders

Remove and Install Cylinders

Disassemble and Assemble Cylinders

SECTION 5 ENGINE EEX25-2 EX30-2 EX35-2 EX40-2 EX45-2

Introduction

Specifications

Performance Curves

Dimensions

M. MECHANISM

F. FEATURE

1. Engine Body

[1] Cylinder Block

[2] Cylinder Head

[3] Crankshaft

[4] Piston and Piston Rings

[5] Connecting Rod

[6] Camshaft

[7] Flywheel

[8] Rocker Arm

2. Lubrication System

[1] General

[2] Oil Pump

[3] Relief Valve

[4] Oil Filter Cartridge

[5] Oil Pressure Switch

3. Cooling System

[1] General

[2] Water Pump

[3] Thermostat

[4] Radiator

[5] Radiator Cap

4. Intake/Exhaust System

[1] Air Cleaner

[2] Muffler

5. Fuel System

[1] General

[2] Injection Pump

[3] Injection Nozzle

[4] Fuel Filter

[5] Governor

[6] Automatic Advance Timer

6. Electrical System

[1] Charging System

S. DISASSEMBLING AND SERVICING

G. GENERAL

[1] Engine Identification

[2] General Precautions

[3] Tightening Torques

[4] Troubleshooting

[5] Servicing Specifications

[6] Maintenance Check List

[7] Check and Maintenance

[8] Special Tools

1. Engine Body

Checking and Adjusting's

Disassembling and Assembling

[1] Draining Water and Oil

[2] External Components

[3] Cylinder Head and Valves

[4] Gear Case

[5] Piston and Connecting Rod

[6] Flywheel and Crankshaft

Servicing

[1] Cylinder Head

[2] Timing Gear and Camshaft

[3] Piston and Connecting Rod

[4] Crankshaft

[5] Cylinder

2. Lubricating System

Checking

Servicing

[1] Oil Pump

3. Cooling System

H Checking

[1] Fat Belt

[2] Radiator

Disassembling and Assembling

4. Fuel System

H Checking and Adjusting

[1] Injection Pump

[2] Injection Nozzle

H Disassembling and Assembling

[1] Injection Pump

[2] Injection Nozzle

5. Electrical System

Checking

[1] Starter

[2] Glow Plug

Disassembling and Assembling

[1] Starter

[2] Alternator

Servicing

[1] Starter

[2] Alternator

Download Links: Hitachi EX25-2 EX30-2 EX35-2 EX40-2 EX45-2 Repair Manual [Excavator]

https://youfixthis.com/hitachi-ex25-2-ex30-2-ex35-2-ex40-2-ex45-2-repair-manual-

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Download Links: Hitachi EX25-2 EX30-2 EX35-2 EX40-2 EX45-2 Repair Manual [Excavator]

https://youfixthis.com/hitachi-ex25-2-ex30-2-ex35-2-ex40-2-ex45-2-repair-manual-

excavator