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Hart-Parr
Explore 21 farm tractor models. Follow a model into its engine specifications, transmissions, dimensions, historical photographs, and available test records.
About Hart-Parr
Charles Hart and Charles Parr established an engine business in Madison, Wisconsin, in 1897 and moved to Charles City, Iowa, in 1901. Their gasoline-tractor operation later joined Oliver in 1929.
- Beginning
- 1897 engine business; Charles City move in 1901
- Founder / origin
- Charles Hart and Charles Parr
- Known for
- Pioneering gasoline tractors
- Sale / later history
- Merged into the Oliver company in 1929
History and legacy
The founders met as engineering students at Wisconsin. City and engineering-history sources distinguish the original engine enterprise from the 1901 factory move and the first production tractors of the early 1900s. The Oliver merger in 1929 carried that manufacturing lineage into a larger group.
Sources & further reading
- TractorData — Hart-Parr history and model archive (opens in a new tab)
- Charles City — documented engine-business origins (opens in a new tab)
- ASME — Hart-Parr engineering landmark (opens in a new tab)
History reviewed 2026-10-20.
Showing 21 of 21 models
60-100
1911–1912
111 hp
Engine estimate from belt power
Unknown
Drive
40-80
1908–1909
110 hp
Source index power
2WD Only
Drive
Old Reliable 30-60
1907–1918
66 hp
Engine estimate from belt power
2WD Only
Drive
28-50
1927–1930
55 hp
Engine estimate from belt power
2WD Only
Drive
22-45
1903–1911
50 hp
Engine estimate from belt power
2WD Only
Drive
28-44
1930–1937
48 hp
Engine estimate from belt power
2WD Only
Drive
Steel King
1916
44 hp
Engine estimate from belt power
2WD Only
Drive
20-40
1912–1914
44 hp
Engine estimate from belt power
Unknown
Drive
40
1923–1927
44 hp
Engine estimate from belt power
2WD Only
Drive
18-36
1926–1930
40 hp
Engine estimate from belt power
2WD Only
Drive
Oil King 23-35
1916–1919
38 hp
Engine estimate from belt power
2WD Only
Drive
New Hart-Parr
1918–1919
33 hp
Engine estimate from belt power
2WD Only
Drive
16-30
1924–1926
33 hp
Engine estimate from belt power
2WD Only
Drive
17-30
1901–1906
33 hp
Engine estimate from belt power
2WD Only
Drive
30
1919–1924
33 hp
Engine estimate from belt power
2WD Only
Drive
18-28
1930–1936
31 hp
Engine estimate from belt power
2WD Only
Drive
Crop Maker 17-27
1916–1917
30 hp
Engine estimate from belt power
2WD Only
Drive
Row Crop 18-27
1930–1935
30 hp
Engine estimate from belt power
2WD Only
Drive
12-24
1924–1930
26 hp
Engine estimate from belt power
2WD Only
Drive
Little Devil 25-22
1914–1916
24 hp
Engine estimate from belt power
2WD Only
Drive
20
1920–1924
22 hp
Engine estimate from belt power
2WD Only
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.