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Gray Tractor
Explore 6 farm tractor models. Follow a model into its engine specifications, transmissions, dimensions, historical photographs, and available test records.
About Gray Tractor
Gray Tractor began building drum-drive tractors in Minneapolis in 1914 using a design developed by W. C. Knapp. The factory closed in 1927 after bankruptcy and a brief restart.
- Beginning
- 1914 production; Knapp’s experiments from 1908
- Founder / origin
- Design associated with W. C. Knapp; company founders unverified
- Known for
- Drum-driven early farm tractors
- Sale / later history
- Bankruptcy in 1924; production resumed before closure in 1927
History and legacy
Wartime exports to France were important. The post-bankruptcy operation also exported to Canada, so the bankruptcy date and final factory closure describe separate events; a successor buyer is not named in the reviewed account.
Sources & further reading
History reviewed 2026-10-20.
Showing 6 of 6 models
22-40
1923–1927
40 hp
Engine estimate from belt power
Unknown
Drive
18-36
1918–1921
36 hp
Engine estimate from belt power
Unknown
Drive
20-36
1922–1924
36 hp
Engine estimate from belt power
Unknown
Drive
20-35
1914–1916
35 hp
Engine estimate from belt power
Unknown
Drive
18-30
1917
30 hp
Engine estimate from belt power
Unknown
Drive
15-25
1915–1916
25 hp
Engine estimate from belt power
Unknown
Drive
Index power values can include estimates derived from belt or PTO power. They are identified on each model card and are not interchangeable with a measured engine rating. Model years and missing values follow the source index.