This manual covers the Farmall A, AV, B, and BN tractor models, produced between 1939 and 1953. These tractors, powered by C-series and MV-series engines, represent a significant advancement in farm mechanization, offering versatility and reliability for family farms. The Farmall A series, in particular, was designed as an affordable and efficient solution for a wide range of agricultural tasks, contributing to a legacy as a leading manufacturer of agricultural machinery. Their robust engineering and straightforward design made them a staple on farms for many years. This comprehensive English-language manual, identified by parts catalog number TC-26, is presented in a searchable and bookmarked format for ease of use. It includes a detailed Service and Repair Manual covering all major systems from the engine and drivetrain to the chassis and electrical components, with step-by-step procedures for disassembly, reassembly, maintenance, and troubleshooting. Additionally, an Illustrated Parts Catalog (IPC) for the Farmall A and AV models provides exploded views, part numbers, and descriptions, essential for accurate part identification and ordering. This resource is invaluable for owners, mechanics, and restoration enthusiasts seeking to maintain, repair, or restore these iconic tractors.