The Massey Ferguson MF135 and MF148 tractors, produced between 1964 and 1976, represent a significant era in agricultural machinery, known for their robust engineering, reliability, and versatility. The MF135, in particular, achieved global popularity for its dependable performance, while the MF148 offered a more powerful option. These tractors, powered by diesel engines and featuring manual transmissions, often with the option of a Multi-Power system, were designed to meet the demanding needs of farming and various industrial applications. Their British heritage is rooted in a long tradition of agricultural equipment manufacturing, positioning them as key competitors against other major brands of their time. This comprehensive service repair workshop manual provides extensive coverage for the Massey Ferguson MF135 and MF148 tractors. It details all aspects of maintenance, from routine checks and fluid specifications to complete rebuilds and advanced diagnostics. The manual covers engine systems, drivetrain, chassis, electrical components, braking, and hydraulics, offering step-by-step instructions, troubleshooting guides, and highly detailed exploded diagrams for precise repair and assembly. This resource is essential for owners, mechanics, and technicians seeking to maintain the operational integrity and longevity of these iconic tractors, empowering them with factory-level information to perform all necessary adjustments and repairs effectively.