1988-1991 Hitachi EX300, EX300LC, EX300H, EX300LCH Excavator Service Manual
Technical reference spanning EX300, EX300LC, EX300H, EX300LCH models: hydraulic system diagrams, engine specifications, and maintenance procedures. Part number: HU11-1A
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Sample pages from the 1988-1991 Hitachi EX300, EX300LC, EX300H, EX300LCH Excavator Service Manual manual
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Hitachi Models Covered & Key Technical Specifications
Models: EX300, EX300LC, EX300H, EX300LCH
Build 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
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1988–1991 Hitachi EX300 Excavator Technical Scope
- Covers 1988–1991 Hitachi EX300, EX300LC, EX300H, and EX300LCH excavators, including standard and long-crawler variants
- Original OEM publication, Index EX300-1A, includes complete technical maintenance and operational theory
- Documents critical service intervals, torque specifications, and hydraulic circuit logic for the Hino EP100-T power plant
- Includes 1033 pages of diagrams, maintenance schedules, and assembly/disassembly documentation for major sub-systems
- File link appears in your order confirmation straight away
- Suitable for printing individual sections for shop-floor use
- This 1988–1991 Hitachi EX300 service manual provides the essential framework for technicians maintaining the EX-series hydraulic systems, superstructures, and front-end attachments
Excavator System Documentation
The 1988–1991 Hitachi EX300 service manual details the operational principles and maintenance requirements for the hydraulic, electrical, and mechanical systems. The document covers the structure and assembly of the superstructure, undercarriage, and front-end attachments including the boom, arm, and bucket. Detailed sections address the main hydraulic circuit, pilot pump logic, swing devices, and electrical system diagnostics for monitors and alarm devices.
Additional chapters explain how factory workshop documentation is structured regarding engine service and fuel systems. This section outlines the how factory workshop documentation is structured procedures for the Hino EP100-T engine, fuel injection pump, and turbocharger components.
Technical Reference and Specification Highlights
This manual provides comprehensive data for unit identification and assembly maintenance. Torque values are documented for essential fasteners including swing bearing bolts at 931 N.m (687 ft.lbs) and boom cylinder pins at 850 N.m (627 ft.lbs). Engine oil capacity is listed at 28 liters. Coolant capacity for the 1988–1991 Hitachi EX300 is documented at 15.5 liters. The hydraulic tank capacity for standard operations is specified at 265 liters. All service data shown here is for reference only — qualified technicians and the original OEM documentation remain the authoritative source for any hands-on work. An official 1033-page Hitachi OEM workshop manual covering the 1988–1991 Hitachi EX300, EX300LC, EX300H, and EX300LCH, documenting engine, hydraulic, electrical, and chassis specifications for the EX-series machine fleet.
Document Reference: Index EX300-1A, Original OEM manufacturer publication
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