This manual provides comprehensive service and repair information for the Hitachi EX230LC-5 Excavator, equipped with ISUZU A-6BG1TQA, A-6BG1 TQA01, or HINO H07D engines. Designed for professionals and owners alike, this guide details the engineering and operational principles of this robust construction equipment. It is intended to assist in maintaining the reliability and performance of the EX230LC-5 Excavator through accurate and thorough technical guidance. The scope of this manual encompasses all aspects of maintenance and repair, including detailed procedures for the upperstructure, undercarriage, front attachment, and engine systems. It features extensive troubleshooting guides, hydraulic and electrical circuit diagrams, connector information, and harness details. By following the step-by-step instructions, illustrations, and specifications, users can effectively diagnose issues, perform routine maintenance, and undertake complex repairs, ensuring the longevity and optimal functioning of their Hitachi EX230LC-5 Excavator.