This manual covers the Hitachi Zaxis Dash-3 series excavators, including the 200-3, 225US-3, 225USR-3, 240-3, and 270-3 models. These machines are engineered for demanding construction and earthmoving applications, featuring robust diesel engines, hydraulic drive transmissions, and a 4WD system. With operating weights ranging from approximately 19,000 kg to 27,000 kg, and impressive digging depths and reaches, these excavators are designed for reliability and performance in various work environments. Their construction emphasizes durability and efficiency, making them a valuable asset for any heavy-duty operation. The purpose of this Service & Repair Workshop Manual is to provide comprehensive guidance for the maintenance, repair, and technical understanding of the Hitachi Zaxis Dash-3 excavators. It details essential procedures, including lubrication requirements, filter change intervals, and system specifications for hydraulics and engines. This manual serves as an indispensable resource for owners, technicians, and mechanics, enabling them to perform accurate diagnostics, conduct routine maintenance, and execute complex repairs, thereby ensuring the optimal performance and longevity of the equipment.