1988-1993 Hitachi EX270 & EX270LC Hydraulic Excavator Technical Manual

1988–1993 Hitachi EX270 & EX270LC Excavator Technical Manual

• Built for owners and workshops servicing the 1988–1993 Hitachi EX270 & EX270LC hydraulic excavator, covering standard, deluxe, and super deluxe machine variants
• Official OEM technical publication with content revisions updated through the early 1990s production cycle
• Features 1062 pages of detailed construction diagrams, system theory, and maintenance procedures
• Cross-reference lookup works via the built-in search
• File link appears in your order confirmation straight away
• Laid out for standard letter and A4 printing
• Contains 85 system-specific assembly schematics, 19 main torque specification tables, and comprehensive electrical circuit diagrams
• This 1988–1993 Hitachi EX270 & EX270LC technical manual provides the foundational engineering data required for heavy-duty field maintenance and component rebuilds on the EX-series hydraulic platform

Documentation Overview

The 1988–1993 Hitachi EX270 & EX270LC technical manual describes the machine construction, hydraulic system architecture, and electrical control logic. Chapters detail the internal function of the Hino H06C-TI engine, superstructure components including the hydraulic pumps and control valves, as well as undercarriage assembly and center joint maintenance. Extensive sections cover operational theory, component disassembly, and the technical specifications required for structural repairs and attachment maintenance.

Technical content also explores the E-P control system, monitoring system features, and the integrated alarm diagnostic circuits used in this excavator. Procedures for routine maintenance include fluid change schedules for the hydraulic, transmission, and swing reduction systems. The final chapters provide detailed alignment values and system-level pressure data essential for professional service environments.

Specification Highlights

Specifications cover engine performance curves, main pump flow rates, and relief valve settings across varying serial number ranges. Main hydraulic pump pressure for travel is listed at 325–350 kgf/cm2 (31900–34300 kpa) depending on the unit. Coolant system capacity is documented at 15 liters. The boom cylinder piston nut tightening torque is specified at 810 ± 81 kgf-m (5856 ± 586 ft.lbs). Maintenance intervals for track tension and lubrication points are included to assist in fleet upkeep. This technical manual is a must-have reference for professionals and qualified technicians handling the maintenance and system-level repairs for the 1988–1993 Hitachi EX270 & EX270LC hydraulic excavator series.