Hitachi EX300-3, EX300LC-3 Excavator Service & Workshop Manual, PDF Repair Guide

Hitachi EX300-3, EX300LC-3 Service & Repair Manual - 1995

Professional maintenance and repair of heavy excavation equipment require factory-level precision to minimize operational downtime and extend component service life. This manual provides the high-level technical intelligence necessary for technicians to perform exact adjustments, complex troubleshooting, and full system overhauls in accordance with original manufacturer standards.

Model Coverage & Hardware Details:

• Hitachi EX300-3 (1995-1997)
• Hitachi EX300LC-3 (1995-1997)
• Hardware Profile: Equipped with the ISUZU 6SD1-TPD engine, a 4-cycle, vertical, 6-cylinder inline, water-cooled direct injection diesel unit with a piston displacement of 9.839 L.

Professional Benefits:

• Cost Efficiency: Detailed wear limits and service standards prevent the unnecessary replacement of expensive hydraulic and engine components.
• Operational Safety: Step-by-step safety procedures for high-pressure fluid handling and pressurized cooling system maintenance ensure a zero-accident workshop environment.
• Technical Accuracy: Verified factory torque values and relief valve settings eliminate errors in hydraulic system calibration.
• Diagnostic Speed: Logical troubleshooting flowcharts for the EC (Engine Control) and PVC (Pump Valve Control) systems reduce diagnostic time.

What’s Included in This Service Manual Set:

This document is a dual-structured technical resource comprising:

• Technical Manual (T/M): Delivery/redelivery info, operational performance tests, and system troubleshooting.
• Workshop Manual (W/M): Maintenance standards, removal/installation, and detailed assembly/disassembly procedures.
• Documentation Scope: Covers specific book volumes for Machine Specifications, Upperstructure, Undercarriage, and Attachment systems (Form Number 140T-01-01).

Box 2: TECHNICAL DATA & STRUCTURE (Deep Dive)

Technical Identification & Specifications

• Serial Number Locations:
  • Machine Identification: The machine type and manufacturing number plate are located on the main frame (Applicable Serial No. 15K 07 001 and more).
  • Engine Identification: Found on the engine block identification plate for the ISUZU 6SD1-TPD.
  • Component IDs: Specific serial number plates are situated on the Hydraulic Pump, Travel Motor, and Swing Motor for precise part tracking.
• Factory Specifications (Proof of Depth):
  • Main Relief Pressure (Digging/Swing): 29.4 MPa (300 kgf/cm², 4,266 psi).
  • Travel Relief Pressure: 34.3 MPa (350 kgf/cm², 4,977 psi).
  • Cylinder Compression: 2.84 MPa (29 kgf/cm²) at 200 min⁻¹.
  • Valve Clearance (Inlet/Exhaust): 0.4 mm / 0.4 mm (measured when cool).
  • Engine Rated Output: 161.8 kW at 2,000 rpm (220 PS).

Visual & Diagnostic Features

• System Schematics: Contains full "Hydraulic Circuit" diagrams detailing neutral, parallel, and confluence passages, as well as comprehensive "Electrical Equipment" specifications.
• Mechanical Illustrations: Features "Exploded Views" and cross-sectional diagrams of the Pump Device, Swing Device, and Control Valve assemblies.
• Diagnostic Logic: Provides functional descriptions of "Speed Sensing" control and "Summation Control" used to regulate pump torque and prevent engine overloading.

Contents at a Glance

• Section 01: Specifications (General Info, Working Ranges, Interchangeability).
• Section 02: Upperstructure (Layout, Pump Device, Swing Device, Control Valve).
• Section 03: Undercarriage (Travel Device, Center Joint, Track Adjuster).
• Section 05: Engine (Main Specs, Performance Curves, Lubrication System).

Professional Value

Specific technical utility: Provides factory wear limits and service standards, such as the 30 µm minimum plating thickness for cylinder rods and specific cracking pressures for the Swing Parking Brake (2.84 MPa). These tolerances ensure that rebuilt components maintain technical integrity and reach their full operational lifespan.