1986-1994 Hitachi EX120 & EX120-2 Excavator Technical Manual
Wiring diagrams, specifications, and troubleshooting procedures for Hitachi EX120 & EX120-2 excavators, covering operation, systems, and components. Ref: T105-01-01-002
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Models Covered & Key Technical Specifications
Reference-Grade Repair Safety Manual: Hitachi Official Hitachi EX120 & EX120-2 Excavator - Technical Manual (Operational Principle & Troubleshooting) 1986-1994 Specification-Guide
Hitachi EX120 & EX120-2 Excavator Manual | Hitachi Excavator Portfolio.
- Nominal Adjustment Range: 2.52 m is configured at 2.52 m in arm context Mapping.
- Principal Power Rating: For optimal operation, 11800 kg defines the basic machine weight Framework.
- Rated Temperature Range: 450 W -- signifies the active printing consumption Threshold.
- Technical Operational Speed: The undercarriage requires 2.5 / 3.4 mph for standard operation Logic.
- Standard Pressure Rating: Ground pressure reaches 0.37 bar Parameters.
- Design Specification Values: The track shoe width is set to 500 mm Endings.
Professional Workshop Service Manual & Technical Specifications
Reference-Grade Repair Safety Manual: Hitachi Official Hitachi EX120 & EX120-2 Excavator - Technical Manual (Operational Principle & Troubleshooting) 1986-1994 Specification-Guide
Application-Range: Hitachi EX120 / EX120-2 // Conceptual-Layout: Excavator / Undercarriage Logic // Model-Specs: 1986-1994
Organized into dedicated modules for
EX120 Excavator Systems & Components
This manual provides comprehensive documentation for the Hitachi EX120 and EX120-2 excavators, detailing various operational systems and essential components. It includes in-depth information on hydraulics, engine systems, electrical diagrams, and undercarriage structures, ensuring a thorough understanding of the machine's functionality. The document is structured to guide users through different aspects of the excavator, from general specifications to specific component details and troubleshooting.
Transmission service information covers the power train and related hydraulic systems.
HVAC system procedures are included for climate control maintenance.
Torque specifications are documented for key engine and hydraulic components to ensure proper assembly.
Parts identification is covered for all major assemblies, including the undercarriage and superstructure.
Removal procedures are documented for critical components such as the pump and control valves.
| Component | Rating | Calibration-Spec |
|---|---|---|
| Hydraulic System | High Pressure | Specific component ratings |
| Engine | Electronic Control | RPM and speed parameters |
| Electrical System | Voltage Distribution | Circuit ratings |
| Undercarriage | Track System | Dimension and wear specs |
| Control Valve | Flow Control | Pressure compensation values |
The manual documents torque specifications for flange face sealing to ensure proper assembly.
Table of Contents Summary:
- Group 01 - Fuels and Lubricants
- Group 03 - Pump Device
- Group 04 - Swing Devices
- Group 02 - Engine Control System
- Group 01 - Component Location
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