The Hitachi Zaxis ZX210W-3 and ZX220W-3 are robust hydraulic excavators from the Zaxis-3 generation, engineered for demanding construction and industrial applications. These machines feature a powerful Hino J05E-TT turbocharged, intercooled, common rail diesel engine, delivering approximately 165 HP for the ZX210W-3 and 172 HP for the ZX220W-3, all while adhering to EPA Tier 3 and EU Stage IIIA emission standards. With a hydrostatic transmission offering two speed modes and an operating weight ranging from 21,000 to 22,000 kg, these excavators are designed for reliability and efficient performance in various work environments. This Workshop Service Manual provides comprehensive guidance for the maintenance and repair of the Hitachi Zaxis ZX210W-3 and ZX220W-3 hydraulic excavators. It covers essential areas including detailed technical specifications, engine and hydraulic system diagnostics, drivetrain information, and recommended service intervals for fluids and filters. The manual is an indispensable resource for owners, technicians, and mechanics, offering the necessary procedures and data to ensure optimal operation, longevity, and safety of the equipment.