Fiat-Hitachi EX135 Excavator Service Manual (1997-2002)

Technical Scope of the Fiat-Hitachi EX135

• Covers 1997–2002 Fiat-Hitachi EX135 crawler excavators equipped with the IVECO 8045.25.282 turbocharged diesel engine
• Official Fiat-Hitachi technical publication Form No. 604.06.827, Edition XI, 1997
• Documents key operational principles through 52 detailed system diagrams, hydraulic flow schematics, and electrical component layouts
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• Laid out for standard letter and A4 printing
• This 1997 edition establishes the baseline operational principles for the EX135 series, detailing the functionality of the variable displacement pump, swing motor, and control valve assemblies

Operational Principles and System Layout

The Fiat-Hitachi EX135 manual provides a technical overview of machine systems, focusing on the functional relationships between components. It details the interaction between the Main Controller (MC), electronic sensors, and hydraulic actuators. Prose sections explain the logic behind the engine control functions, including Normal, HP Mode, E Mode, Auto-Idle, and the Engine Learning system. The document further describes the arm regenerative valve operation and how signal pilot pressures influence the performance of the hydraulic travel and work circuits.

Specification and Hydraulic Data Preview

Technical data is presented through clear descriptive catalogs of system capabilities. The hydraulic system documentation covers main relief valve settings, pilot pump specifications, and travel motor displacement control parameters. The Fiat-Hitachi EX135 main pump flow is documented at 94.5 L/min per pump in the specification section. Electrical system details include fuse box ratings, relay configurations, and monitor panel functions. Intake air heater circuit logic is provided for cold-weather starting. The IVECO 8045.25.282 engine displacement is specified at 3907 cm³ in the main specifications. Reference only — always consult a certified technician before performing service on this equipment.

An official 633-page Fiat-Hitachi technical manual covering the 1997–2002 EX135, documenting operational principles, system logic, and technical specifications for the hydraulic, electrical, and powertrain components of the unit.