McCormick Farmall A/B Tractor Parts Catalog (P/N 357070 R91)

• Covers 1939–1955 McCormick Farmall A, AV, B, and BN tractors, including specific engine variants for gasoline, kerosene, and distillate fuel systems
• 229-page official International Harvester parts publication, P/N 357070 R91, incorporating Revision No. 1 from July 1955
• Contains over 100 exploded-view diagrams and a complete numerical index of part numbers and assembly pages
• Provides the most accurate identification for the transition from earlier TC-26-E documentation, essential for matching serialized engine and chassis components

Assembly and System Coverage

You need the right part numbers to keep these vintage tractors running. This catalog breaks down the Farmall series from end to end. Every chapter is organized by tractor unit. It starts at the carbureted engine and its internal components, then works outward to the electrical systems, chassis, and optional attachments. You get clear exploded views of major sub-assemblies like the crankcase, fuel tank, transmission, and final drive. These diagrams make it easy to pinpoint specific hardware, right down to the correct bolts, nuts, and gaskets. Detailed tables list every part alongside its reference number, original serial range, and required quantity. Always verify your tractor's exact serial number against the manual before ordering components or starting heavy teardowns to ensure proper fitment and safe machine operation. Correct identification takes the guesswork out of your restoration or routine maintenance.

Technical Specification Preview

Engine data covers standard production blocks alongside specific fuel-burning variants. You will find exact part numbers for valve spring collar keys, cylinder head studs, and altitude-specific piston ring replacement kits. Transmission sections log the necessary gear shift rail guides, bearing specifications, and spline shaft components. The electrical diagrams document different lighting and starting setups. This includes specific parts for Bosch and Delco-Remy generators, as well as battery ignition distributors. For the drivetrain, the final drive and differential sections highlight critical wear items. You can easily locate axle housing gaskets, bearing shims, and rear wheel shaft variants for both standard and high-clearance configurations. Everything in this OEM parts manual is geared toward accurate, factory-correct component identification across the entire production run.