This manual covers the Kubota KH51 and KH61 compact excavators, designed for a variety of construction and landscaping tasks. These machines are engineered for durability and operational efficiency, featuring robust construction and user-friendly controls, typically including joystick operation for precise maneuvering. While specific engine details, displacement, power output, operating weight, digging depth, reach, and bucket capacity vary by model configuration, the core design emphasizes reliability and performance in demanding environments. Safety features such as a Roll-Over Protective Structure (ROPS) and seatbelts are integral to the operator's protection. The purpose of this comprehensive service and repair manual is to provide detailed information essential for the maintenance and repair of your Kubota KH51 or KH61 excavator. It covers a wide range of critical areas, including general maintenance procedures, troubleshooting common issues, engine and transmission service, brake system diagnostics, electrical system schematics, suspension and steering adjustments, cooling and fuel system upkeep, emission system servicing, and chassis repair. This manual is an indispensable resource for owners, technicians, and mechanics, offering the technical specifications and guidance needed to ensure optimal performance, longevity, and safe operation of the equipment.