Airman AX55U-6A (Hitachi ZX55U-5A) Hydraulic Excavator Technical Manual and Circuit Diagrams

Airman AX55U-6A (Hitachi ZX55U-5A) Hydraulic Excavator Technical Manual and Circuit Diagrams

This manual provides detailed technical information, precise specifications, and step-by-step procedures required for accurate diagnostics and efficient service operations.

• TAEB-EN-00
• INTRODUCTION
• SYMBOL AND ABBREVIATION
• SAFETY
• SECTION AND GROUP CONTENTS
• SECTION 1 GENERAL
  • Group 1 Specifications
    • Std. Specification
    • Working Ranges
  • Group 2 Component Layout
    • Main Component
    • Electrical System (Overview)
    • Electrical System (Relays)
    • Electrical System (Relays) (Cab Spec. Machine)
    • Electrical System (Monitor, Switches)
    • Electrical System (Battery Room)
    • Engine
    • Swing Device
    • Revolution Sensing Valve/Pilot Filter
    • Travel Device
    • Auxiliary Flow Rate Selector Valve (Optional)
    • Control Valve
    • 2-Spool Solenoid Valve
  • Group 3 Component Specifications
    • Engine
    • Engine Accessories
    • Hydraulic Component
    • Electrical Component
• SECTION 2 SYSTEM
  • Group 1 Control System
    • Outline
    • Engine Control
    • Pump Control
    • Valve Control
    • Other Control
  • Group 2 Hydraulic System
    • Outline
    • Pilot Circuit
    • Main Circuit
  • Group 3 Electrical System
    • Outline
    • Main Circuit
    • Electric Power Circuit (Key Switch: OFF)
    • CAN Circuit
    • Electric Power Circuit (Key Switch: ON)
    • Preheating Circuit (Key Switch: ON)
    • Starting Circuit (Key Switch: START)
    • Charging Circuit (Key Switch: ON)
    • Pilot Shut-Off Circuit (Key Switch: ON)
    • Auto Shut-Down Circuit (OP)
    • Engine Stop Circuit (Key Switch: OFF)
• SECTION 3 COMPONENT OPERATION
  • Group 1 Pump Device
    • Outline
    • Main Pump P1
    • Flow Rate Control
    • Control by Signal Pressure
    • Control by Own Pump Pressure
  • Group 2 Revolution Sensing Valve
    • Outline
    • Operation
  • Group 3 Swing Device
    • Outline
    • Swing Reduction Gear
    • Swing Motor
    • Parking Brake
    • Valve Unit
  • Group 4 Control Valve
    • Outline
    • Hydraulic Circuit
    • Main Relief Valve
    • Overload Relief Valve (with Make-Up Function)
    • Make-Up Valve
    • Boom Anti-Drift Valve
    • Flow Rate Control Valve
    • Unload Valve
    • Differential Reducing Valve
    • Pressure Compensator
  • Group 5 Pilot Valve
    • Outline
    • Operation (Front Attachment / Swing and Travel Pilot Valves)
    • Operation (Boom Swing / Blade / Auxiliary (Optional) Pilot Valve)
    • Shockless Function (Only for Travel Pilot Valve)
    • Shuttle Valve (Optional)
  • Group 6 Travel Device
    • Outline
    • Travel Reduction Gear
    • Travel Motor
    • Parking Brake
    • Travel Brake Valve
  • Group 7 Others (Upperstructure)
    • 2-Spool Solenoid Valve
    • Torque Control Solenoid Valve (Only Machine with the Air Conditioner (Optional) Attached)
    • Auxiliary Flow Rate Selector Valve (Optional)
  • Group 8 Others (Undercarriage)
    • Swing Bearing
    • Center Joint
    • Track Adjuster
• SECTION 4 OPERATIONAL PERFORMANCE TEST
  • Group 1 Introduction
    • Operational Performance Tests
    • Preparation for Performance Tests
  • Group 2 Standard
    • Operational Performance Standard Table
    • Main Pump P-Q Diagram
    • Sensor Activating Range
  • Group 3 Engine Test
    • Engine Speed
    • Lubricant Consumption
  • Group 4 Machine Performance Test
    • Travel Speed
    • Track Revolution Speed
    • Mistrack Check
    • Travel Parking Leakage
    • Swing Speed
    • Swing Function Drift Check
    • Swing Motor Leakage
    • Maximum Swingable Slant Angle
    • Swing Bearing Play
    • Hydraulic Cylinder Cycle Time
    • Dig Function Drift Check
    • Control Lever Operating Force
    • Control Lever Stroke
    • Combined Operation of Boom Raise / Swing Function Check
    • Clearance of Front Attachment Connecting Part
  • Group 5 Component Test
    • Primary Pilot Pressure
    • Secondary Pilot Pressure
    • Main Relief Set Pressure
    • Overload Relief Valve Set Pressure
    • Pump Driving Torque
    • Swing Motor Drainage
    • Travel Motor Drainage
    • Revolution Sensing Valve Output Pressure (Pressure PGR)
    • Pump Delivery Pressure
    • Auxiliary Flow Rate Selector Valve Pressure (Optional)
• SECTION 5 TROUBLESHOOTING
  • Group 1 Diagnosing Procedure
    • Introduction
    • Diagnosis Procedure
    • Electric System Inspection
    • Precautions for Inspection and Maintenance
    • Instructions for Disconnecting Connectors
    • Fuse Inspection
    • Slow Blow Fuse Inspection
    • Battery Voltage Check
    • Alternator Check
    • Continuity Check
    • Voltage Inspection Method
    • Check by False Signal
  • Group 2 Monitor
    • Outline
    • Operating Procedures of Service Menu
    • Inspection of Fuel Gauge, Battery Voltage, Hour Meter, and Destination No
    • Fuel Gauge and Coolant Temperature Gauge
    • Factory Setting
  • Group 3 Troubleshooting A
    • Troubleshooting A (Base Machine Diagnosis by Using Fault Codes) Procedure
    • Fault Code List
    • Fault Code W: 1304
    • Fault Code W: 1310
    • Fault Code W: 2304
    • Fault Code W: 2306
    • Fault Code W: 2307
  • Group 4 Troubleshooting B
    • Troubleshooting B (Machine Diagnosis by Using Troubleshooting Symptom) Procedure
    • Engine System Troubleshooting
    • All Actuator System Troubleshooting
    • Front Attachment System Troubleshooting
    • Swing System Troubleshooting
    • Travel System Troubleshooting
    • Blade System Troubleshooting
    • Boom Swing System Troubleshooting
    • How to Lowering Boom in Case of Emergency and When Engine Stops
• SERVICE MANUAL REVISION REQUEST FORM
• The Attached Diagram List

Language: English
Format: PDF

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