This manual covers the Hitachi Zaxis 270-3 Class excavator, a robust piece of equipment engineered for demanding construction and earthmoving tasks. As part of the 3rd Generation Zaxis Series, this model benefits from advanced design principles focused on reliability, performance, and operational efficiency. It is powered by a diesel engine, commonly an Isuzu AH-6HK1X, with a displacement of 7.8 L, delivering substantial gross power. Its hydraulic system, featuring variable displacement piston pumps and motors, ensures precise control and power delivery for a wide range of applications, from excavation to material handling. The operating weight is approximately 27,000 kg, and it is equipped to handle buckets with capacities from 0.9 to 1.5 m³. This Service Repair Workshop Manual provides comprehensive guidance for maintaining and repairing the Hitachi Zaxis 270-3 Class excavator. It details essential maintenance procedures, including engine oil and hydraulic oil specifications and capacities, as well as filter replacement intervals. Technical specifications cover engine performance, transmission details, dimensions, and operational data such as swing and travel speeds. Safety guidelines and troubleshooting information are also included to assist operators, mechanics, and technicians in ensuring the longevity and optimal performance of the equipment. The manual is presented in English and is compatible with Windows and Mac operating systems.