This manual covers the HITACHI EX400-3 and EX400-3C EXCAVATOR models. These excavators are engineered for demanding operational environments, offering robust performance and reliability. Their design emphasizes durability and efficiency, making them suitable for a wide range of heavy-duty construction and excavation tasks. The HITACHI EX400-3 series is built to withstand rigorous use while providing operators with the power and control necessary for complex projects. The purpose of this comprehensive service repair manual is to provide detailed instructions and procedures for the maintenance, repair, and troubleshooting of your HITACHI EXCAVATOR. It is designed to assist owners, technicians, and mechanics in effectively diagnosing and resolving issues, ensuring the continued optimal performance and longevity of the equipment. This manual covers all essential aspects of the vehicle's operation and upkeep.