This manual covers the Hitachi Zaxis 50U excavator, a robust machine from the Zaxis Series. Engineered for demanding work environments, this compact excavator offers reliable performance and efficient operation. Its hydrostatic swing and travel system, coupled with a water-cooled diesel engine, provides precise control and power for various construction and landscaping tasks. The Zaxis 50U is designed with operator comfort and productivity in mind, featuring a sturdy build and essential operational capabilities for its class. This Service Repair Workshop Manual in English provides comprehensive instructions for mechanics and technicians. It details full service and repair procedures, including maintenance schedules, filter replacement guides, and troubleshooting diagnostics. The manual also includes technical specifications for the hydraulic system, undercarriage, and dimensions, along with crucial safety procedures. Its purpose is to ensure the Zaxis 50U excavator is maintained and repaired to optimal working condition, maximizing its lifespan and operational efficiency.