This manual provides comprehensive service and repair information for the Hitachi EX270LC-5 Excavator, equipped with ISUZU A-6BG1TQA, A-6BG1 TQA01, or HINO H07D engines. Designed for mechanics worldwide, this resource details operational principles, troubleshooting, system overviews, component functions, and performance testing specific to this model. It covers essential areas such as the upperstructure, undercarriage, front attachments, and engine systems, ensuring detailed guidance for maintaining and repairing the EX270LC-5 Excavator. The scope of this manual encompasses detailed step-by-step instructions, diagrams, illustrations, and wiring schematics for both hydraulic and electrical circuits. It serves as an indispensable tool for owners and service professionals, offering the same technical specifications and repair procedures utilized by authorized dealers. By providing clear, concise text and visual aids, this manual empowers users to perform maintenance, diagnostics, and repairs efficiently and safely, thereby promoting a deeper understanding and informed management of their equipment.