This manual covers the International Harvester Farmall A, AV, B, and BN series tractors, produced from the late 1930s through the 1950s. These tractors were engineered by International Harvester as versatile and affordable machines for small to medium-sized farms, often featuring a distinctive frame designed for row crop cultivation. Their robust construction and reliable performance have made them enduring choices for restoration projects and continued agricultural use. This illustrated parts catalog provides comprehensive details for all components of these classic tractors. The purpose of this manual is to serve as an indispensable resource for owners, mechanics, and technicians. It offers detailed part identification, exploded view diagrams for assembly guidance, and a numerical index of all part numbers, crucial for accurate ordering and repair. Coverage includes all major systems such as the engine, chassis, transmission, drivetrain, hydraulics, electrical, cooling, fuel, and braking systems, as well as operator controls and attachments. This guide is designed to facilitate maintenance, repair, and restoration, ensuring the longevity and proper functioning of your International Harvester Farmall tractor.