This manual covers the Hitachi Hydraulic Excavator Zaxis ZX210W-3 and ZX220W-3 models. These excavators are engineered for robust performance and reliability in demanding construction and industrial applications. Their design emphasizes efficiency, operator comfort, and advanced hydraulic systems, making them a preferred choice for professionals seeking durable and productive heavy machinery. The purpose of this service manual is to provide comprehensive guidance for the maintenance, repair, and technical understanding of the Hitachi Zaxis ZX210W-3 and ZX220W-3 excavators. It details essential procedures, troubleshooting steps, technical specifications, and safety protocols. This resource is designed to assist owners, technicians, and mechanics in ensuring the optimal performance, longevity, and safe operation of these machines.