This workshop service manual covers the Kubota KH51 excavator, a robust machine designed for various digging and construction tasks. Engineered for reliability and efficiency, the KH51 features a water-cooled, 4-cycle diesel engine, ensuring dependable performance in demanding environments. Adherence to recommended maintenance schedules and the use of genuine Kubota parts and approved lubricants are crucial for maximizing the lifespan and operational satisfaction of this versatile equipment. The purpose of this comprehensive manual is to provide detailed guidance for the repair, maintenance, and servicing of the Kubota KH51 excavator. It includes step-by-step repair procedures, troubleshooting guides for addressing unusual noises or performance changes, and essential technical specifications such as tightening torques and wear limits. Safety is paramount, with accident prevention guidelines and specific DANGER, CAUTION, and NOTE remarks integrated throughout to ensure safe operation and repair practices. This manual is an indispensable resource for owners, mechanics, and technicians.