This manual covers the Massey Ferguson MF390, MF390T, and MF398 tractor models, renowned for their robust engineering and reliability in agricultural applications. Produced during the late 20th century, these tractors represent a significant evolution in Massey Ferguson's lineup, known for their versatility and durability. The MF390T variant, in particular, highlights the integration of turbocharging for enhanced power and efficiency. This comprehensive resource is designed to support owners and technicians in maintaining these dependable machines. The purpose of this workshop service and repair manual is to provide detailed guidance for the maintenance, troubleshooting, and repair of your Massey Ferguson tractor. It encompasses a wide range of systems, including the engine, transmission, hydraulic system, electrical system, brakes, and steering. With hundreds of pages featuring step-by-step instructions, detailed illustrations, diagrams, and troubleshooting sections, this manual empowers both experienced mechanics and do-it-yourself owners to perform all necessary service procedures, from routine maintenance to complete component overhauls, ensuring optimal performance and longevity.