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 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 seamlessly via the built-in search
• Contains 85 system-specific assembly schematics, 19 main torque specification tables, and comprehensive electrical circuit diagrams
• Essential engineering data for heavy-duty field maintenance and component repair
• Instant download provided directly in your order confirmation
• Laid out for standard letter and A4 printing

Documentation Overview

The Hitachi EX270 and EX270LC technical manual delivers a clear look at the machine's construction, hydraulic system architecture, and electrical control logic. It details the internal functions of the Hino H06C-TI engine alongside superstructure components like hydraulic pumps and control valves. You get immediate access to the baseline metrics required to troubleshoot the E-P control system and integrated alarm diagnostic circuits. Working with heavy machinery requires strict adherence to proper shop safety protocols, especially when servicing high-pressure hydraulic lines. Extensive sections dive into undercarriage assembly, center joint maintenance, and the operational theory behind the equipment. This reference cuts out the guesswork for professional service environments by offering clear alignment values and reliable diagnostic data.

Specification Highlights

Critical limits and performance curves are clearly defined for mechanics on the shop floor. You will find exact main pump flow rates and relief valve settings mapped across varying serial number ranges. The manual lists the main hydraulic pump pressure for travel at 325–350 kgf/cm2 (31900–34300 kpa), depending on your specific unit. Coolant system capacity is officially documented at 15 liters. Tightening the boom cylinder piston nut requires absolute precision; the technical data specifies exactly 810 ± 81 kgf-m (5856 ± 586 ft.lbs) of torque. Track tension guidelines and dedicated lubrication intervals are included to help maintain fleet readiness and support any complex system repair.