Hitachi EX120-3 Excavator Technical Workshop Manual PDF Download

Description

Manual Overview

This is the official Hitachi EX120-3 Excavator Technical Workshop Manual (T/M and W/M). This 1,000+ page manual is written for experienced technicians and provides the complete technical information needed for maintenance, repair, troubleshooting, and operational performance testing. It is the definitive service resource for the EX120-3 model, covering both the technical theory (T/M) and the hands-on workshop procedures (W/M).

Models Covered

This manual applies to the Hitachi EX120-3 excavator, specifically for units with serial numbers 12V-40001 and up. It includes detailed information for various arm lengths (2.10 m, 2.52 m, and 3.01 m) and a full range of shoe types, including grouser, flat, and rubber crawler options.

Main Systems & Subjects Included

• Engine: Full technical specifications and service procedures for the ISUZU 4BD1T engine, including cooling, lubrication, starting, fuel, and pre-heat systems.
• Hydraulic System: In-depth coverage of the main pump, pilot pump, control valve, swing device, travel device, and all cylinders. Includes detailed diagrams and explanations of load sensing and speed sensing controls.
• Electrical System: Complete electrical system diagrams and troubleshooting for main circuits, control systems, monitor panels, and all sensors (EC, PVC, DP, A, P, T).
• Operational Performance Tests: Step-by-step procedures for engine tests, excavator tests (travel speed, swing speed, etc.), and hydraulic component tests to ensure peak machine performance.
• Troubleshooting: Extensive diagnostic section with fault code lists for EC and PVC controllers and detailed troubleshooting flow charts for engine, actuator, and system malfunctions.
• Specifications: Complete technical data including weights, working ranges, service refill capacities, and component specifications for every major part.

Repair & Maintenance Coverage

This manual enables the technician to perform all workshop-level service tasks, from standard maintenance to major repairs and rebuilds. It includes detailed removal/installation and disassembly/assembly procedures for the engine, hydraulic pumps, control valves, swing and travel drives, and the undercarriage. All necessary maintenance standards, tool specifications, and torque values are provided.

Why This Manual Is Useful

This is the only comprehensive technical reference needed to keep an EX120-3 excavator operating at its full potential. It empowers you to diagnose complex electronic and hydraulic faults quickly, accurately tune engine and pump performance, and confidently perform major component overhauls, saving thousands in dealer repair costs.

Instant PDF Download

This is a digital product. Upon purchase, you will receive immediate access to download the complete manual in PDF format. It is fully searchable and can be used on any device, making it an indispensable tool for any workshop or field technician.