This manual covers the Hitachi Zaxis 240-3 Hydraulic Excavator, a robust machine designed for demanding construction and earthmoving applications. Engineered for reliability and efficiency, this excavator features a powerful HINO J05E-TSS diesel engine producing approximately 160 HP, a hydrostatic transmission with a 2-speed travel system, and a substantial operating weight of around 23,300 kg. Its substantial dimensions, including a digging depth of up to 6,720 mm and a reach of 10,030 mm, make it a versatile tool for a wide range of tasks. The Zaxis 240-3 is built to deliver consistent performance and durability in challenging environments. The purpose of this English-language Factory Service Repair Manual is to provide comprehensive information for the maintenance, repair, and servicing of the Hitachi Zaxis 240-3 Hydraulic Excavator. It details essential procedures, technical specifications, and diagnostic information necessary for optimal operation and longevity. Key areas covered include engine maintenance, hydraulic system servicing, drivetrain adjustments, and fluid capacity guidelines. This manual serves as an indispensable resource for owners, operators, and technicians, ensuring that the excavator can be kept in peak condition, minimizing downtime and maximizing productivity.