Hitachi ZX20U-5A Excavator WACD90-EN-00 (Preview)
WACD90-EN-00
INTRODUCTION
SYMBOL AND ABBREVIATION
SAFETY
SECTION AND GROUP CONTENTS
SECTION 1GENERAL
Group 1 Precautions for Disassembling and Assembling
Precautions for Disassembling and Assembling
Group 2 Tightening
Tightening Bolts and Nuts
Piping Joint
Group 3 Painting
Painting
Group 4 Bleeding Air
Bleeding Air from Hydraulic Oil Tank
Bleeding Air from Hydraulic System
Bleeding Air from Fuel System
Bleeding Air from Radiator
Group 5 Releasing Pressure
Releasing Pressure in Hydraulic Circuit
Group 6 Preparation
Preparation before Inspection and Maintenance
Group 7 Connect The Hose
Angle to connect the hose
SECTION 2MAINTENANCE STANDARD
Group 1 Upperstructure
Pump Device
Swing Motor
Group 2 Undercarriage
Travel Motor
Sprocket
Front Idler
Lower Roller
Track
Group 3 Front Attachment
Pin and Bushing
Side Cutter
Standard Dimensions for Arm and Bucket Connection
Cylinder
SECTION 3UPPERSTRUCTURE
Group 1 Canopy and Cab
Removal and Installation of Canopy
Group 2 Counterweight
Removal and Installation of Counterweight
Group 3 Main Frame
Removal and Installation of Main Frame
Group 4 Pump Device
Removal and Installation of Pump Device
Disassembly of Pump Device
Assembly of Pump Device
Group 5 Control Valve
Removal and Installation of Control Valve
Disassembly and Assembly of Control Valve
Disassembly of Body
Assembly of Body
Group 6 Swing Device
Removal and Installation of Swing Device
Disassembly of Swing Reduction Gear
Assembly of Swing Reduction Gear
Disassembly of Swing Motor
Assembly of Swing Motor
Group 7 Pilot Valve
Removal and Installation of Pilot Valve (Left)
Removal and Installation of Pilot Valve (Right)
Removal and Installation of Travel Pilot Valve
Removal and Installation of Blade Pilot Valve
Removal and Installation of Boom Swing Pilot Valve
Disassembly of Pilot Valves (Right and Left)
Assembly of Pilot Valves (Right and Left)
Disassembly of Travel Pilot Valve
Assembly of Travel Pilot Valve
Disassembly of Pilot Valves for Boom Swing, Blade, Auxiliary (Optional)
Assembly of Pilot Valves for Boom Swing, Blade, Auxiliary (Optional)
Group 8 Solenoid Valve
Removal and Installation of 2-Spool Solenoid Valve
Disassembly of 2-Spool Solenoid Valve
Assembly of 2-Spool Solenoid Valve
SECTION 4UNDERCARRIAGE
Group 1 Swing Bearing
Removal and Installation of Swing Bearing
Group 2 Travel Device
Removal and Installation of Travel Device
Disassembly of Travel Reduction Gear
Assembly of Travel Reduction Gear
Disassembly of Travel Motor
Assembly of Travel Motor
Disassembly of Brake Valve
Assembly of Brake Valve
Precautions for Using Floating Seal
Group 3 Center Joint
Removal and Installation of Center Joint
Disassembly of Center Joint
Assembly of Center Joint
Group 4 Track Adjuster
Removal and Installation of Track Adjuster
Disassembly of Track Adjuster
Assembly of Track Adjuster
Group 5 Front Idler
Removal and Installation of Front Idler
Disassembly of Front Idler
Assembly of Front Idler
Group 6 Upper and Lower Rollers
Removal and Installation of Lower Roller
Group 7 Track
Removal and Installation of Track
Group 8 Blade Cylinder
Removal and Installation of Blade Cylinder
Disassembly of Blade Cylinder
Assembly of Blade Cylinder
SECTION 5FRONT ATTACHMENT
Group 1 Front Attachment
Removal and Installation of Front Attachment
Group 2 Cylinder
Removal and Installation of Boom Cylinder
Removal and Installation of Arm Cylinder
Removal and Installation of Bucket Cylinder
Removal and Installation of Boom Swing Cylinder
Disassembly of Boom Cylinder
Assembly of Boom Cylinder
Disassembly of Arm, Bucket, and Boom Swing Cylinders
Assembly of Arm, Bucket, and Boom Swing Cylinders
SERVICE MANUAL REVISION REQUEST FORM
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