1988-1993 Hitachi EX270 & EX270LC Hydraulic Excavator Technical Manual

Field service reference for the Hitachi EX270 & EX270LC Hydraulic Excavator, covering engine, hydraulics, and electrical systems. PN D/A HYP-34A-21

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Document Details

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Document Number / Seller:
31003 / Donna Young
File Size:
46.45 MB
File Type:
PDF
Language:
English
Pages:
1062
Printable:
Yes
Category:
Excavator
Last updated / verified
Feb 24, 2026

Models Covered & Key Technical Specifications

Essential Technical Manual: Excavator Hitachi EX270 & EX270LC Hydraulic Excavator Technical Manual 1988-1993 Technical-Briefing 1988-1993 Hitachi EX270 & EX270LC Hydraulic Excavator Technical Manual | Series Suite.

  • Engineered Velocity Specs: For optimal operation, 17.7 establishes the core performance metric Benchmark.
  • Design Component Weight: The overall counterweight requires 5400 kg for standard balance Mapping.
  • Documented Addressable Resolution: 10 mm -- signifies the minimum clearance for key component alignment Configuration.
  • Prescribed Reservoir Specs: The main hydraulic tank requires 200 lit for standard operation Logic.
  • Nominal Interference Fit: Maximum output reaches 32 kgf/cm2 (3922 kpa) Parameters.
  • Primary Feed Speed: The air cleaner consists of 10 u elements to ensure optimal throughput Baseline.

Manual Description & Preview

Essential Technical Manual: Excavator Hitachi EX270 & EX270LC Hydraulic Excavator Technical Manual 1988-1993 Technical-Briefing

Year-Coverage: 1988-1993 // Engineering-Metrics: 1062 Pages / 46.4526 MB Logic // Procedure-Type: Service Manual.

Integrated-Framework Value Logic
GENERAL SPECIFICATIONS Dimensions Metrical Data
COMPONENT SPECIFICATIONS Engine Model H06C-TI
TORQUE REFERENCE Bolt Specification Torque Data
MAINTENANCE INTERVALS Lubrication Schedule Preventative Care
CONVERSION TABLE Units Conversions

Major sections focus on:

Excavator Hitachi EX270 & EX270LC Hydraulic Excavator Technical Manual: 1988-1993

This manual covers: This manual provides in-depth documentation on the construction, maintenance, and repair of the Hitachi EX270 and EX270LC hydraulic excavators. It details the various systems including the engine, hydraulic system, electrical system, and superstructure components.

Diagnostic procedures are covered for

systems and their components, offering troubleshooting guidance for common issues encountered during operation.

Wiring diagrams are provided for

clarity in understanding the electrical system's layout and component connections.

Fuel system procedures are documented for

ensuring the proper maintenance and repair of the fuel delivery and filtration systems. Reference data is included for specifications, conversion tables, and tightening torques to facilitate accurate servicing. This manual covers components such as the main pump, control valve, swing motor, and travel motor, detailing their specifications and assembly procedures.

...documents torque specifications for bolts to ensure proper component alignment retention.

FAQ

Does this manual include detailed section coverage for the engine, hydraulic systems, and electrical circuits? keyboard_arrow_down

Technical manual contains eleven distinct sections that cover the engine, hydraulic system, superstructure, undercarriage, front-end attachments, and electrical systems.

What document references and revision cues are associated with this technical manual? keyboard_arrow_down

Publication is designated as a technical manual for the specified hydraulic excavator series. It includes structured group contents, section indices, and standardized identification markers for all technical content.

Which system chapters contain exploded views or component specifications for the hydraulic assembly and pilot valve circuitry? keyboard_arrow_down

Section 4 and Section 7 of the document provide detailed information on the superstructure, including the hydraulic pump, control valves, swing devices, and pilot valve principles. The manual also includes hydraulic system chapters that outline the main circuit, pilot circuit, and extra control circuitry. These sections offer technical details and specification tables for the primary components of the hydraulic system.

Can the manual be accessed on multiple electronic devices immediately after purchase? keyboard_arrow_down

Manual is provided in a digital PDF format, which allows for instant download and viewing on various compatible electronic devices.

Is the EX270LC model series included in the scope of this technical documentation? keyboard_arrow_down

Manual serves as a technical resource for both the EX270 and EX270LC hydraulic excavator models manufactured between 1988 and 1993. It provides comprehensive specifications and diagrams relevant to these excavator series.

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