The Hitachi Zaxis series excavators, including models 200, 225USR, 225US, 230, and 270, represent a line of robust construction equipment designed for demanding work environments. These excavators are engineered with powerful diesel engines, hydrostatic transmissions, and advanced hydraulic systems featuring variable displacement piston pumps, ensuring efficient operation and reliable performance. With features such as enclosed cabs equipped with air conditioning, pilot controls, and a range of compatible attachments like buckets, hydraulic hammers, and grapples, the Zaxis series is built for versatility and operator comfort across various heavy-duty applications. Their construction emphasizes durability and operational longevity. This Factory Service Repair Manual provides comprehensive guidance for the Hitachi Zaxis excavators. It covers essential maintenance procedures, detailed troubleshooting steps, and critical technical specifications necessary for the upkeep and repair of these machines. The manual is intended for owners, mechanics, and technicians, offering the necessary information to ensure optimal performance, safety, and extended service life. Key areas include engine and hydraulic system maintenance, undercarriage servicing, and an overview of safety features such as ROPS certified cabs and safety interlocks.