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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Komatsu Hitachi manual preview - 1986-1994 Hitachi EX120 & EX120-2 Excavator Technical Manual
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Document Details

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Document Number / Seller:
30396 / Linda Taylor
File Size:
32.22 MB
File Type:
PDF
Language:
English
Pages:
451
Printable:
Yes
Category:
Hitachi
Last updated / verified
Mar 14, 2026

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.

Manual Description & Preview

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

FAQ

What technical reference categories and machine dimension data are included in the specification sections of this document? keyboard_arrow_down

Specification groups contain detailed tables covering operating weights, ground pressure ratings, and machine dimensions like track shoe width and swing radius. These tables provide a structured summary of the Hitachi EX120 and EX120-2 design values for reference purposes.

Is there a specific publication or group marking system shown in this technical manual? keyboard_arrow_down

Each page in this technical manual is marked with a specific group and section number, following the example notation format provided in the introduction pages.

Are there reference tables for service refill capacities and fluid volumes in this manual? keyboard_arrow_down

Manual includes a dedicated service refill capacities table that lists standard volumes for engine coolant, fuel, hydraulic oil, and various gear systems. These tables serve as a quick reference for the specified capacities required for the machine.

Which pages feature diagrams that illustrate the main machine components for the excavator? keyboard_arrow_down

Specification section includes an exploded view style diagram that labels the primary components of the front-end attachment, upperstructure, and undercarriage.

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