Farmall Super A, A-1, AV & AV-1 Tractors McCormick 1947–1960 Parts Catalog (P/N TC-39C)

• Covers 1947–1960 McCormick Farmall Super A, A-1, AV, and AV-1 tractors, including 3x4 and 3-1/8x4 engine configurations and fuel-type variants.
• Official International Harvester parts publication TC-39C (revised January 1960).
• Contains hundreds of exploded-view diagrams to identify component relationships, precise part numbers, and serial-number-specific configurations.
• Details the Touch-Control hydraulic system, Hydra-Creeper attachment, Fast-Hitch setups, power take-off, and steering mechanism.
• Outlines Carter, Marvel-Schebler, and Zenith carburetors, plus Auburn or Rockford clutches, and Delco-Remy generators.

Parts Catalog Breakdown

Clocking in at over 290 pages, this digital PDF reference breaks down the entire tractor assembly. It specifically highlights the mechanical differences between the C-113 and C-123 engine platforms. Sections isolate the engine block, valve assemblies, ignition systems, and transmission components. While a parts manual lacks written step-by-step instructions, the intricate assembly drawings and component views serve as a visual teardown and reassembly guide. Seeing exactly how the final drive or transmission shafts stack up allows you to complete a complex fix yourself, bypassing a costly trip to the mechanic. Exploded diagrams make it easy to verify components by visual description or numerical part code. It serves as the definitive reference for distinguishing early-production parts (pre-250001 serial range) from later model variants.

Specialized indexes allow quick cross-referencing for the chassis, hydraulic system, and electrical components. If you are dealing with routing issues, the included Wiring diagrams and cable routing schematics provide essential guidance for your diagnostic workflow. The catalog lists parts in logical groups using detailed parts charts, detailing required quantities and exact serial number breaks for accurate procurement. When matching parts for high-pressure hydraulic lines or electrical harnesses, always verify component compatibility against your specific serial number to prevent equipment failure or operational hazards. Standard hardware is clearly delineated from specialized OEM components, saving significant time when sourcing replacements during routine maintenance or a major repair in the shop. Having the correct part numbers prevents ordering the wrong hardware, keeping you from tying up a service bay for weeks.

Component Specification Preview

Technical data includes engine operating speeds, transmission backlash tolerances, and lift capacities. The engine data section documents head gaskets and piston ring sets tailored for gasoline, distillate, and kerosene setups. Cylinder head specifications explicitly state the intake valve clearance (0.11–0.20 mm). The C-123 engine block assemblies are mapped out alongside all relevant serial number breaks. Magneto and battery ignition systems are fully segmented, detailing the exact distributor caps, rotors, and coil assemblies required for your specific build.

When conducting intensive troubleshooting on these McCormick powerplants, a frequent mechanical trap is ignoring the specific serial number breaks (around 310300) for thin-wall versus thick-wall cylinder sleeves; forcing the wrong sleeve set into the block inevitably leads to severe fitment issues and internal coolant leaks. Furthermore, successfully rebuilding the highly sensitive Touch-Control block requires perfectly matching the internal control valves and O-rings, as using incorrect early-style hardware will cause immediate fluid bypass.