The Hitachi Zaxis 225USRLCK-3 is a robust hydraulic excavator engineered for demanding construction and industrial applications. This Dash-3 generation model, powered by an Isuzu AA-6HK1XQS direct injection diesel engine producing 161 net horsepower, features a hydrostatic transmission for precise control and variable travel speeds. With an operating weight of 21,800 kg, a maximum digging depth of 6,680 mm, and a standard bucket capacity of 1.03 m³, the Zaxis 225USRLCK-3 is designed for efficiency and reliability in various operational environments. Its construction emphasizes durability and performance, making it a capable machine for extensive earthmoving tasks. This comprehensive service manual provides detailed technical information and procedures for the Hitachi Zaxis 225USRLCK-3 hydraulic excavator. Covering essential aspects such as maintenance schedules, diagnostic routines, repair instructions, and technical specifications for its Isuzu engine and hydrostatic drivetrain, this manual is an indispensable resource. It is intended for technicians and service personnel, offering the necessary guidance to ensure optimal performance, longevity, and safe operation of the equipment. The manual's extensive coverage aids in efficient troubleshooting and effective maintenance, supporting the machine's overall productivity.