This manual covers the Hitachi EX270-5 Excavator, equipped with ISUZU A-6BG1TQA, A-6BG1 TQA01, or HINO H07D engines. Designed for demanding operational environments, the EX270-5 represents a commitment to robust engineering and reliable performance in heavy-duty construction and excavation tasks. Its construction prioritizes durability and efficiency, making it a dependable choice for a wide range of professional applications. The purpose of this comprehensive service repair manual is to provide detailed guidance for the maintenance, repair, and troubleshooting of the Hitachi EX270-5 Excavator. It includes extensive information on operational principles, system components, troubleshooting procedures, hydraulic and electrical circuits, and workshop instructions for the upper structure, undercarriage, front attachment, and engine. This resource is intended for both do-it-yourself enthusiasts and experienced technicians, offering step-by-step instructions and illustrations to ensure the vehicle remains in optimal working condition.