The Massey Ferguson 670, 690, and 698 series tractors, produced from the late 1970s through the 1980s, represent a robust line of utility tractors renowned for their versatility and durability in agricultural and industrial applications. These tractors are powered by reliable Perkins diesel engines, ranging from 3 to 6 cylinders, and feature a range of transmission options including the Multi-Power system and standard gearboxes. Their construction emphasizes strength and serviceability, making them a favored choice for demanding tasks. This manual serves as a comprehensive guide to understanding, maintaining, and repairing these iconic machines. This Service Repair Manual provides extensive coverage for the Massey Ferguson 670, 690, and 698 tractors. It details complete engine overhaul procedures for various Perkins diesel engines, along with in-depth instructions for the fuel, cooling, lubrication, transmission, hydraulic, PTO, braking, steering, and electrical systems. The manual includes scheduled maintenance guidelines, systematic troubleshooting charts, detailed repair and adjustment procedures, and rebuild instructions for major components. Technical specifications, torque values, fluid capacities, and safety guidelines are also provided, making it an indispensable resource for owners, operators, and technicians aiming to ensure optimal performance and longevity of their tractors.