This service repair manual covers Massey Harris models 44, 55, 81, and 82 tractors, encompassing all variants, engines, and transmission types. Massey Harris, a pioneering American manufacturer, is renowned for its innovative and durable agricultural machinery. The tractors in this series, particularly the 44 and 55, represent significant advancements from the late 1940s and 1950s, known for their robust construction and reliable performance in their operational era. These machines were designed for demanding agricultural tasks, offering dependable power and functionality. This comprehensive factory service repair workshop manual provides detailed information essential for maintaining and repairing your Massey Harris tractor. It includes step-by-step procedures for engine overhaul, fuel and ignition systems, transmission, clutch, hydraulics, steering, brakes, and the electrical system. The manual also covers chassis, front and rear axles, power take-off, and bodywork, along with essential maintenance schedules, troubleshooting guides, and detailed technical specifications such as torque values and fluid requirements. Its factory-level detail, complete with high-quality diagrams and exploded views, makes it an invaluable resource for both do-it-yourself owners and professional mechanics.