This manual covers the Kubota KH51/KH61, a versatile piece of equipment designed for demanding work. While specific production years are not detailed, the engineering behind these models emphasizes reliability and robust performance, making them suitable for a wide range of construction and industrial applications. The integrated hydraulic system, featuring a pump device, main control valve, swing device, and travel motor, is a key component in its operational efficiency. The purpose of this comprehensive Service Repair Manual is to provide detailed information for the maintenance, repair, and troubleshooting of the Kubota KH51/KH61. It encompasses general information, engine specifications, fuel and cooling systems, chassis components, transmission, brakes, steering, and the electrical system, including wiring diagrams. With extensive coverage of disassembly, assembly, maintenance standards, and troubleshooting guides for hydraulic, mechanical, and electrical issues, this manual serves as an essential resource for owners and technicians to ensure the optimal performance and longevity of the equipment.