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
• Details specific assemblies including Marvel-Schebler carburetors, Zenith carburetors, International Type H-4 magnetos, Rockford clutches, Atwood clutches, Donaldson air cleaners, pneumatic Lift-All systems, and power take-off units
• Covers chassis and optional equipment like belt pulley attachments, adjustable front axles, steering mechanisms, radiator shutters, foot brakes, swinging drawbars, pneumatic tire pumps, and spark arresters

Assembly and System Coverage

You need the right part numbers to keep these vintage tractors running. This PDF 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 transmission gear schematics and carburetor parts views 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.

While a parts manual does not feature written step-by-step repair instructions, the highly detailed sequence of washers, shims, and gears in these clutch assembly drawings acts as a visual guide. This allows you to confidently tackle complex tasks like rebuilding the Rockford clutch or overhauling the transmission yourself, saving the heavy labor costs of a professional shop. 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 prevents costly aftermarket mismatch errors and speeds up your troubleshooting process.

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 mapped out in clear drivetrain layout charts. The electrical section provides complete wiring diagrams to document different lighting and starting setups. This includes specific parts for Bosch and Delco-Remy generators, as well as battery ignition distributors and magneto assembly drawings. For the drivetrain, the final drive schematics 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.