1939-1968 International Harvester Series A, B, C, Cub, H, M, MTA, 4, 6, W6TA & 9 Wheel Type Tractors Shop Manual (P/N 74-547)
88 Pages • 110.78 MB • Instant, Printable PDF
Farmall Models Covered & Key Technical Specifications
Models: Series A, Series B, Series C, Cub, Series H, Series 4, Series M, Series 6, Series 9, MTA, W6TA
Sub-models / Variants: A, AV, Super A, Super AV, B, BN, C, Super C, Cub Lo-Boy, H, Super H, HV, Super HV, 04, OS4, W4, Super W4, M, Super M, Super MLPG, Super MTA, MD, Super MD, Super MD Diesel, MV, Super MV, Super MTA Diesel Hi-Clearance, MDV, Super MDV, Super MTA Diesel Hi-Clearance, Super MV LPG, 06, OS6, W6, Super W6, Super W6TA, ODS6, WD6, Super WD6, Super WD6TA, Super W6 LPG, W9, WR9, WR9S, WD9, WDR9, Super WD9, Super WDR9
Trade Names: Farmall, McCormick
Model Years: 1939–1968
Serial Numbers: Series H prior 21621, Series H after 21620, Series 4 (Super MV prior 45371, Super MV after 45370), Series 9 (WR9S, WD9, WDR9, Super WD9, Super WDR9)
Technical Data:
- Engine displacement: 59.5 cu in (Cub) to 350 cu in (Series 9)
- Engine configurations: 4-cylinder inline (gasoline, distillate, diesel, LPG)
- Drive system: 2WD (tricycle or adjustable axle configurations)
- Clutch types: Rockford or Auburn (spring loaded or over-center)
- Torque amplifier: Optional planetary gear reduction unit (1.482:1 reduction)
- Electrical systems: 6V magneto or battery-powered ignition
- Hydraulic systems: Touch-Control or independent Lift-All systems
Farmall Manual Features & Content Preview
- Original 88-page OEM publication (P/N 74-547) documenting critical maintenance for 1939–1968 International Harvester and Farmall wheel-type tractors
- Supported series include A, B, C, Cub, H, M, MTA, 4, 6, W6TA, and 9 across gasoline, distillate, and diesel engine variants
- Features 432 technical illustrations, exploded-view diagrams, and electrical schematics for complex engine and drivetrain assemblies
- Details factory specifications for advanced mechanical options, including the torque amplifier and independent power take-off units
Engine, Transmission, and Drivetrain Documentation
Restoring or maintaining vintage International Harvester equipment requires exact factory data. This manual outlines the core mechanical systems, starting with complete engine overhaul procedures. It breaks down cylinder head service, piston and sleeve specifications, and camshaft maintenance. You get precise procedures for engine removal, clutch assembly service, and final drive teardowns. The document also details steering gear, axle assemblies, and the exact service requirements for hydraulic Lift-All and Touch-Control systems, including pumps, control valves, and cylinders. Because vintage machinery carries inherent risks, always review the included factory safety warnings and pressure-relief procedures before cracking open hydraulic lines or lifting heavy chassis components.
Specification Highlights
Guessing torque values on a 1940s engine block is a bad idea. This manual eliminates the guesswork. Comprehensive tables document cylinder head bolt torque, valve tappet clearances (hot and cold), and crankshaft journal dimensions across all engine variants. Engine low idle speeds run between 425 and 525 rpm, depending on your exact series. The service data specifies crankshaft end play at 4 to 8 thousandths for most models, while intake valve seat angles are locked at a standard 45 degrees. You will also find itemized fluid capacities for transmissions, differentials, and cooling systems. Having these exact numbers on hand speeds up routine shop maintenance and ensures historically accurate, reliable rebuilds.
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