Samson Tractor
A historic American tractor brand that operated from approximately 1900 to 1923 and became a General Motors division in 1917.
Last updated August 31, 2026
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Overview
Samson Tractor was an American agricultural-machinery brand associated primarily with farm tractors, with additional activity in trucks and an unsuccessful attempt to develop a passenger automobile. Its business originated with the Samson Iron Works in Stockton, California, which became known for producing farm tractors. The company was renamed the Samson Tractor Company in 1916 and the Samson Sieve-Grip Tractor Company in 1917, reflecting the importance of its Sieve-Grip tractor design and its developing product identity. General Motors acquired the company in 1917 under the leadership of William C. Durant. The purchase formed part of GM's effort to enter the agricultural-tractor market and compete with Ford Motor Company's commercially successful Fordson Model F. GM also acquired the Janesville Machine Company of Janesville, Wisconsin, in 1918 for $1 million. Rather than maintain two separate production centers, GM consolidated the Samson and Janesville operations in Janesville. In 1919, the Stockton operation was closed and the business was reorganized as the Samson Tractor Company Division of General Motors. The brand's best-known pre-acquisition product was the Sieve-Grip, a large, heavy three-wheeled tractor with a low-slung frame. Its engine was mounted centrally between a single front wheel and two straked rear wheels. Different versions were offered with varying engine capacities, including the Sieve Grip 6-12, the 10-25, and the 12-25. After GM's involvement, the range included models such as the Model 30X, Model S-25, Model M, and Model D, also known as the Samson Motor Cultivator or Iron Horse. The Model D was a walk-behind power unit that could be attached to agricultural implements rather than operated from a conventional seat. GM placed particular hopes in the four-wheel Samson Model M. Production began in May 1919 at an initial rate of about ten units per day. The tractor was initially priced at $650, a level intended to support competition with Fordson. The price soon rose to $840 because the original pricing proved unprofitable, undermining the plan to challenge Fordson through aggressive volume and pricing. The change illustrated the commercial difficulty GM faced in translating its industrial resources into a viable farm-equipment business. Samson also produced trucks from 1920 through 1923. The truck range included three-quarter-ton and one-and-one-quarter-ton models powered by a Chevrolet engine rated at 26 horsepower and derived from the Chevrolet 490 passenger car. Market success was limited. The company also announced a farm-oriented passenger car in 1919. Promoted as the "Whole Family Car," the proposed touring car was designed to seat up to nine people, with removable rear and jump seats to provide additional cargo capacity. It used a 118-inch wheelbase, a steel ladder frame, and a Chevrolet FB four-cylinder engine rated at 37 horsepower. GM planned substantial production, but only one prototype was built, making it an announced GM automobile that never entered series production. General Motors closed the unprofitable Samson division in 1923. The Janesville assembly facility was transferred to Chevrolet, after which Chevrolet and GMC trucks and sport-utility vehicles were produced there for many decades. The Samson name therefore disappeared as a commercial vehicle brand, but its tractors remain part of the early history of GM's agricultural-equipment strategy and of the development of American farm machinery.
History
The business that became Samson Tractor began as the Samson Iron Works in Stockton, California. Its early reputation came from the manufacture of farm tractors, especially the Sieve-Grip design. This was a substantial three-wheeled machine with a low chassis, a centrally placed engine, one front wheel, and two straked rear wheels. Several engine and power configurations were offered before the company entered General Motors' orbit. The enterprise adopted the Samson Tractor Company name in 1916 and was renamed the Samson Sieve-Grip Tractor Company in 1917. That same year, General Motors purchased the company under William C. Durant. GM's objective was to establish a presence in the agricultural-tractor market at a time when Fordson and other manufacturers were demonstrating the potential of standardized farm machinery. Samson consequently became one of GM's early attempts to diversify beyond automobiles and related motor vehicles. GM expanded its agricultural-equipment position in 1918 by purchasing Janesville Machine Company in Wisconsin for $1 million. The company decided to combine the two operations in Janesville. In 1919, GM shut down Samson's Stockton activities and reorganized the business as the Samson Tractor Company Division of General Motors in Janesville. The consolidation was intended to improve manufacturing focus and create a more efficient production base. The central product of GM's Samson program was the Model M, a new four-wheel tractor whose production began in May 1919. Output initially reached approximately ten units per day. The Model M was introduced at $650, a price intended to make it a serious competitor to Fordson. The price was later increased to $840 because the lower figure was not profitable. That increase weakened GM's plan to achieve high sales volume and limited the tractor's ability to compete on price. The broader Samson range included the Model 30X, Model S-25, and Model D. The Model D was also marketed as the Samson Motor Cultivator or Iron Horse. Unlike a conventional seated tractor, it was a walk-behind power unit that could be connected to implements. These products show that Samson's offering covered both full-size tractors and smaller, implement-oriented agricultural machines. The company expanded into commercial vehicles between 1920 and 1923 with three-quarter-ton and one-and-one-quarter-ton trucks. These vehicles used a Chevrolet 26-horsepower engine derived from the Chevrolet 490 passenger car. Their market performance was limited. Samson also announced a proposed passenger vehicle, the Whole Family Car, which was intended to be designed specifically around farmers' requirements. The nine-passenger touring-car concept featured removable rear and jump seats to increase carrying capacity, but only one prototype was completed. The Samson passenger car was announced by GM in 1919 with ambitious projected production volumes, yet it never reached series manufacture. The combination of weak tractor economics, limited truck success, and the failure to commercialize the automobile left the division without a sustainable product base. GM closed Samson in 1923 and transferred the Janesville facility to Chevrolet. The plant later supported Chevrolet and GMC truck and sport-utility-vehicle production until its closure in December 2008. Samson therefore existed as a commercial brand for roughly the first two decades of the twentieth century, with its final years defined by GM ownership and unsuccessful attempts to scale agricultural and related vehicle production.
- 1923
Samson division closed
[1]General Motors closed the unprofitable Samson division and reassigned the Janesville plant to Chevrolet.
- 1920
Samson truck production begins
[1]Samson entered truck production with three-quarter-ton and one-and-one-quarter-ton models.
- 1919
Stockton operations closed and Model M production begins
[1]GM consolidated Samson in Janesville and began producing the four-wheel Model M in May.
- 1918
Janesville Machine Company acquired
[1]GM acquired Janesville Machine Company for $1 million and selected Janesville as the combined production center.
- 1917
GM acquires Samson
[1]General Motors purchased Samson and the business was again renamed the Samson Sieve-Grip Tractor Company.
- 1916
Business renamed Samson Tractor Company
[1]The Stockton agricultural-machinery business adopted the Samson Tractor Company name.
- 1900
Samson Iron Works established
[1]The business that developed into Samson Tractor was established in Stockton, California, and became associated with farm-tractor production.
Products and positioning
A farm-equipment brand positioned around robust agricultural tractors and practical power units, later used by General Motors in an attempt to establish a competitive presence in the American tractor market.
Three-wheeled farm tractor
Samson Sieve-Grip
The Sieve-Grip was Samson's principal early tractor line and the product most closely associated with the brand before and around the GM acquisition. It used a heavy, low-slung three-wheel layout, with the engine positioned centrally between a single front wheel and two straked rear wheels. The line included multiple power configurations, including the 6-12, 10-25, and 12-25 versions.
Four-wheel farm tractor · 1919
Samson Model M
The Model M was GM's modern four-wheel Samson tractor and the centerpiece of its attempt to compete with Fordson. Production began in May 1919 at approximately ten units per day. It initially sold for $650, but the price was raised to $840 after GM found the original level unprofitable, weakening its intended high-volume market position.
Motor cultivator / walk-behind power unit
Samson Model D
Also known as the Samson Motor Cultivator and Iron Horse, the Model D was a compact agricultural power unit designed to be attached to implements. It differed from a conventional tractor by operating as a walk-behind machine without a driver's seat.
Light and medium-duty trucks · 1920
Samson trucks
Samson produced three-quarter-ton and one-and-one-quarter-ton trucks from 1920 to 1923. They used a Chevrolet engine rated at 26 horsepower, derived from the power unit used in the Chevrolet 490 passenger car. The trucks achieved limited commercial success.
Proposed passenger automobile · 1919
Samson Whole Family Car
The Whole Family Car was a proposed nine-passenger touring automobile designed around farm use. It featured a 118-inch wheelbase, a conventional steel ladder frame, and removable rear and jump seats that could increase cargo capacity. GM announced the vehicle in 1919, but only one prototype was built and series production never began.
Brand decisions
1923
General Motors exits the Samson tractor businessStrategyBackground
The Samson division remained unprofitable despite GM's consolidation and product expansion.
Action taken
GM closed the Samson division and transferred its Janesville assembly plant to Chevrolet.
Aftermath
The Samson brand ceased operating, while the Janesville facility continued under Chevrolet and later supported Chevrolet and GMC vehicle production.
1919
Production consolidated in JanesvilleStrategyBackground
GM had acquired Janesville Machine Company and wanted to operate the related agricultural-equipment businesses from one manufacturing center.
Action taken
GM closed Samson's Stockton operation and operated the business as the Samson Tractor Company Division of General Motors in Janesville.
Aftermath
The consolidation created a single production base but did not make the Samson business profitable enough to survive.
1919
Model M price increasedPrice changeBackground
The Model M was introduced at a price intended to support high-volume competition with Fordson, but the initial price proved unprofitable.
Action taken
The Model M price was raised from $650 to $840.
Aftermath
The higher price undermined the plan to outsell Fordson and contributed to the commercial difficulties of the Samson program.
Model M listed price. $650 → $840 (1919)
1917
General Motors enters the tractor market through SamsonM&ABackground
GM sought to participate in the growing American farm-tractor market and to challenge the commercial success of Fordson.
Action taken
GM purchased Samson and incorporated it into the company's agricultural-machinery activities.
Aftermath
Samson became a GM brand, with production later consolidated in Janesville, Wisconsin.
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