This manual covers the HITACHI ZX 170W-3 and ZX 190W-3 HYDRAULIC EXCAVATOR models. These machines are engineered for demanding hydraulic excavation tasks, offering robust performance and reliability in various work environments. Their design emphasizes durability and operational efficiency, making them a trusted choice for construction and heavy-duty applications. The purpose of this workshop service repair manual is to provide comprehensive guidance for the maintenance and repair of your HITACHI hydraulic excavator. It includes detailed procedures, technical specifications, and troubleshooting information essential for ensuring optimal performance and longevity. This resource is intended for technicians and mechanics to effectively service and maintain the equipment.