This manual covers the Massey Ferguson MF135 and MF148 tractors, renowned for their robust engineering and reliability in agricultural applications. The MF135, produced from 1964 to 1972, is celebrated as one of Massey Ferguson's most successful utility tractors, known for its versatility. The MF148, manufactured between 1972 and 1978, built upon the MF135's legacy, offering enhanced power for more demanding tasks. These tractors, primarily built in the UK, feature dependable Perkins diesel engines, with the MF135 utilizing the 3.152 model and the MF148 the 4.203 model, providing approximately 40-60 PTO horsepower depending on the specific configuration. This comprehensive service and repair manual provides detailed information essential for the maintenance and upkeep of your Massey Ferguson tractor. It covers all aspects of service and repair, including in-depth engine overhaul procedures, transmission servicing for both standard and Multi-Power gearboxes, brake system diagnosis, and detailed electrical system guidance with wiring diagrams. Furthermore, the manual offers procedures for suspension, steering, cooling, fuel injection, and chassis systems, alongside general maintenance, troubleshooting, and periodic lubrication schedules. This resource is invaluable for tractor owners, independent mechanics, and agricultural workshops seeking to ensure the longevity and optimal performance of their MF135 or MF148.