Bull

Diamond T Design

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Bull

A Little Bull model 5-12 at Newark
Vintage Tractor Show 2008

Bull Tractor Co.

Bull Tractor Co., Minneapolis, introduced its first tractor in 1913 with the lightweight three-wheeled Little Bull rated at 5-12 hp. It was one of the first tractors built to replace four horses on a gang plow. Its revolutionary design � compared to the heavyweight tractors of the time � featured one large and one small rear wheel to ride level when plowing. However, the larger of the rear wheels was the only one that was powered.

The Little Bull was followed in 1915 by a more powerful Big Bull with a 24 hp twin-cylinder, opposed engine developing 12 hp at the drawbar. Both tractors proved so popular that Bull Tractor Co. quickly became one of the largest producers of tractors in the U.S. Bull even signed to supply Massey-Harris, but supply problems prevented the company from delivering on the contract and the deal fell through. At the same time, farmers were finding that the tractor�s 3-wheel design could be unstable on hills and its open gears malfunctioned when dirt got into them. Bull Tractor Co. declared bankruptcy in 1920, shortly after Ford entered the market with a 4-wheel, mass-produced tractor at an economical price.