Hitachi EX300, EX300LC, EX300H, EX300LCH 1988-1991 Excavator Service Manual (P/N HU11-1A)
1,033 Pages • 50.03 MB • Instant, Printable PDF
Hitachi Models Covered & Key Technical Specifications
Models: EX300, EX300LC, EX300H, EX300LCH
Model Years: 1988–1991
Serial Numbers: EX300: 02001–02488, 02492–02579, 02489–02491, 02580 and up
Technical Data:
- Engine: Hino EP 100-T, water-cooled, 4-cycle, 6-cylinder, turbocharged diesel
- Engine displacement: 8821 cm³
- Engine rated output: 158 kW at 2000 rpm
- Max engine torque: 814 N.m at 1600 rpm
- Main pump: HPV145CW-28A variable displacement axial piston pump
- Hydraulic rated pressure: 350 kgf/cm² (travel), 285 kgf/cm² (front)
- Bucket capacity: 1.00 m³ to 1.86 m³ (PCSA heaped)
- Electrical system: 24V starting and charging system
Hitachi Manual Features & Content Preview
- Original OEM publication, Index EX300-1A, encompassing 1033 pages of diagrams, maintenance schedules, and assembly/disassembly documentation for major sub-systems
- Covers 1988–1991 Hitachi EX300, EX300LC, EX300H, and EX300LCH excavators, including standard and long-crawler variants
- Documents critical service intervals, torque specifications, and hydraulic circuit logic for the Hino EP100-T power plant
- Provides the essential framework for technicians maintaining EX-series hydraulic systems, superstructures, and front-end attachments
Excavator System Documentation
The service manual details the operational principles and maintenance requirements for the hydraulic, electrical, and mechanical systems. It breaks down the structure and assembly of the superstructure, undercarriage, and front-end attachments, including the boom, arm, and bucket. You will find dedicated sections addressing the main hydraulic circuit, pilot pump logic, and swing devices, alongside electrical system diagnostics for monitors and alarm devices. Additional chapters explain the factory procedures for engine service and fuel systems. This includes precise documentation for the Hino EP100-T engine, fuel injection pump, and turbocharger components.
Technical Reference and Specification Highlights
This documentation provides comprehensive data for unit identification and assembly maintenance. Torque values are clearly mapped out for essential fasteners. For instance, swing bearing bolts require 931 N.m (687 ft.lbs), while boom cylinder pins are set at 850 N.m (627 ft.lbs). Fluid capacities are also fully detailed: the engine takes 28 liters of oil, the cooling system holds 15.5 liters, and the hydraulic tank requires 265 liters for standard operations. Keep in mind that working on heavy machinery involves significant physical risks; these specifications are intended to supplement professional knowledge, so always verify procedures against the original manufacturer metrics before beginning any hands-on maintenance. The manual serves as a complete, authoritative reference for chassis, engine, and hydraulic specifications across the entire EX-series fleet.
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