This workshop service manual covers the Hitachi Zaxis series excavators, including variants such as the 200, 225USR, 225US, 230, and 270. These machines are engineered for demanding construction and earthmoving applications, featuring robust diesel engines, likely from the Cummins ISC/ISL series, providing approximately 160-190 horsepower. Their hydrostatic transmission and tracked drive system ensure reliable performance and maneuverability on various job sites. With operating weights ranging from approximately 20,000 to 27,000 kg, the Zaxis excavators are built for durability and efficiency. The purpose of this English-language workshop service manual is to provide comprehensive guidance for the service and repair of the Hitachi Zaxis excavators. It details essential maintenance procedures, including engine oil and filter replacement schedules, air filter maintenance, and hydraulic system upkeep. Technical specifications for the engine, hydraulics, and undercarriage are included, along with troubleshooting information. This manual serves as an indispensable resource for owners, mechanics, and technicians to ensure the optimal performance, longevity, and safe operation of their equipment.