This manual covers the Hitachi EX270-5 Excavator, designed for demanding operational environments. It provides comprehensive service and maintenance information for all models, engines, and trim types, including those with ISUZU A-6BG1TQA, A-6BG1 TQA01, and HINO H07D engines. The EX270-5 is engineered for reliability and performance, making it a valuable asset for various construction and industrial applications. The purpose of this workshop repair service manual is to equip owners, mechanics, and technicians with the necessary knowledge for effective maintenance and repair. It details operational principles, troubleshooting procedures, system overviews, component operations, and performance tests. Additionally, it includes extensive information on hydraulic and electrical circuits, wiring diagrams, upperstructure, undercarriage, front attachments, and engine-related components, ensuring that all aspects of the excavator can be properly serviced.