This manual covers the Hitachi Hydraulic Excavator Zaxis ZX210W-3 and ZX220W-3 models. These machines are engineered for robust performance and reliability in demanding construction environments. Their design emphasizes efficiency and durability, making them suitable for a wide range of excavation and material handling tasks. The Zaxis series is known for its advanced hydraulic systems and operator comfort features, contributing to productive and safe operation. The purpose of this comprehensive service repair manual is to provide detailed technical information for the maintenance, diagnosis, and repair of your Hitachi Hydraulic Excavator. It includes essential procedures, specifications, and troubleshooting guides to assist owners, technicians, and mechanics in keeping the equipment in optimal working condition. By following the instructions within this manual, users can ensure the longevity and performance of their ZX210W-3 and ZX220W-3 excavators.