Farmall M

The Farmall M is a classic row-crop tractor known for its versatility and long-lasting performance. Produced from 1939 to 1954 by Farmall, a division of International Harvester, it became a staple on farms across the United States and beyond. With various engine options and configurations, the Farmall M was a reliable workhorse, handling a wide range of agricultural tasks. Its enduring popularity among farmers and collectors alike speaks to its enduring legacy in the world of farming equipment.

Farmall M Specs
Production Years1939 – 1954
TypeRow-Crop tractor
ManufacturerFarmall (a part of International Harvester)
Made inBuilt in Rock Island, Illinois, USA
Total Built270,140
Original Price$1,440 (1946), $2,600 (1952)
VariantsMD (diesel engine), MV (high-crop), MDV (diesel high-crop), AM (Australian-built M, built 1949-1954), BM (British-built M), W-6 (standard-front), I-6 (industrial)
Engines Overview
International Harvester4.1L 4-cyl distillate
International Harvester4.1L 4-cyl gasoline
Engine Detail
Displacement247.7 ci (4.1 L)
Bore/Stroke3.875×5.25 inches (98 x 133 mm)
Compression4.75:1 (distillate), 4.5:1 (gasoline)
Rated RPM1,450
Firing Order1-3-4-2
Oil Capacity8 qts (7.6 L)
Coolant Capacity24 qts (22.7 L)
TypeSliding gear
Gears5 forward and 1 reverse
Farmall M Power
Drawbar (claimed)25 hp (18.6 kW)
Belt (claimed)31-33 hp (23.1 kW)
Plows3 (14-inch)
Drawbar (tested)33.1 hp (24.7 kW)
PTO (tested)36.07 hp (26.9 kW)
Belt (tested)36.66 hp (27.3 kW)
DriveTwo-wheel drive
BrakesMechanical contracting band brakes
Operator StationOpen
TypeLift-All (Early
Power Take-off (PTO)
Rear RPM540 (1.375)
Farmall M Tires
Ag Front6.00-16
Ag Rear11-38
Ag Front (Steel)22.50×4
Ag Rear (Steel)51×8, 10-38, 12-38, 11.25-36
Wheelbase88.5 inches (224 cm)
Length133 inches (337 cm)
Width84 inches (213 cm)
Height78.3 inches (198 cm)
Shipping Weight4,858 lbs (2,203 kg)
Ballasted Weight6,770 lbs (3,070 kg)
Front Tread9.125 inches (23 cm)
Rear Tread52 to 88 inches (132 to 223 cm)
International Harvester 30 Loader
Breakout Force5,000 lbs (2,268 kg)
Breakout Force (at Pin)1,500 lbs (680 kg)
Height (at Pin)96 inches (243 cm)
Boom Cylinder Diameter3.0 inches (7 cm)
Weight1,270 lbs (576 kg)
Bucket Width43.5 inches (110 cm)
Farmall M Overview

The Farmall M, manufactured by Farmall, a division of International Harvester, is a historical icon in the world of tractors. Produced from 1939 to 1954, this row-crop tractor was renowned for its ruggedness and versatility. It featured a choice of two engines, one powered by distillate and the other by gasoline, both with a 4-cylinder liquid-cooled vertical I-head design. With its displacement of 4.1 liters, it offered a good balance of power and fuel efficiency for its time.
The Farmall M had a 5-speed sliding gear transmission, providing adequate control and adaptability for various farming tasks. It was equipped with mechanical contracting band brakes and manual steering, reflecting the simplicity of tractor technology during that era. The hydraulics, known as Lift-All, were available with two pressure options, 500 psi in the early models and 800 psi in the later versions, enabling the use of various implements.

In today’s context, the Farmall M serves as a historical relic, showcasing the early innovations in tractor design and manufacturing. Collectors and enthusiasts appreciate it not only for its functionality but also for its significance in the evolution of farming equipment. With its robust build and nostalgic appeal, the Farmall M remains a sought-after model among tractor collectors, providing a glimpse into the rich history of agricultural machinery.

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