This manual covers the Nuffield Universal 3 and Universal 4 tractor and industrial models, primarily produced from the late 1950s through the 1960s. These vehicles, developed by the Nuffield Organization and later part of British Leyland, were known for their sturdy construction and reliability in agricultural and industrial applications. The Universal series represented a robust evolution of earlier Nuffield designs, offering dependable performance with features such as diesel engines, manual transmissions with range gearboxes, and PTO capabilities. They are recognized for their solid engineering, making them enduring machines for their intended purpose. This comprehensive Service Repair Workshop Manual provides in-depth technical information for maintaining and repairing your Nuffield Universal tractor. It covers all aspects of the vehicle, including detailed procedures for engine overhaul, transmission servicing, hydraulic system repair, steering and brake system maintenance, and electrical system troubleshooting. The manual includes step-by-step instructions, illustrations, and wiring diagrams to assist owners, mechanics, and technicians. Its purpose is to ensure the continued operational efficiency and longevity of these vintage tractors through thorough servicing and accurate repair.