The Hitachi Zaxis 27U-2 is a compact excavator from the U-2 Series, engineered for reliability and performance in various construction and landscaping applications. This diesel-powered machine features an Isuzu 4LE2-XBJA engine, delivering 20.1 kW (27.0 hp) of net power, and a water-cooled system for optimal operating temperatures. Its robust design includes a hydraulic motor for travel drive with high/low speed selection, a hydraulic system operating at 21 MPa, and a pump flow rate of 55.6 L/min. With an operating weight of 2690 kg and dimensions optimized for maneuverability, the Zaxis 27U-2 is built to handle demanding tasks efficiently. This Service Repair Manual provides comprehensive guidance for maintaining and repairing the Hitachi Zaxis 27U-2 excavator. It covers essential areas including detailed maintenance procedures for engine oil, hydraulic filters, and fluid capacities, alongside technical specifications for the engine, transmission, and hydraulic systems. Safety guidelines and troubleshooting information are also included to assist owners, mechanics, and technicians in ensuring the longevity and optimal performance of the equipment. This manual is an indispensable resource for all service-related activities.