Oliver Hart-Parr Tractors

With the merger of the Oliver Chilled Plow Works and the Hart-Parr Tractor Company, a completely new tractor was designed using ideas from both companies. The result of this merger was the introduction of the Oliver Hart-Parr Row Crop tractor in 1930. This was a single-front wheel machine having holes in the frame for pipe-mount implements.

In 1931 the single wheel was replaced by two narrow wheels. After the Row Crop was tested in Nebraska in April of 1930, it became the 18-27. This model used a Waukesha/Oliver engine while burned gas or kerosene. It was produced until 1937.

The next model in the line-up was the 18-28, which was basically the same tractor as the 18-27 but was the standard version. It also had a slight increase in RPMs, which gained the model one belt horsepower. This model was also produced until 1937.

The 28-44 was the larger tractor in the lineup. Rated as a 3-5 plow tractor, it was also introduced in 1930. This tractor had several variations with the most unique being the Thresherman’s Special. It was equipped with a whistle and solid cast disc wheels. The High Compression Special was a 28-44 but burned only gasoline and had a different head on it. The high compression head resulted in a rating of 32-50 although that model was never tested in Nebraska.

In 1935 Oliver introduced their new design in tractors. The model 70 was born with a 6-cylinder Continental engine and a styling not seen before in the tractor world. This model set the trend for all tractors of the future. When the 70 was first introduced it had both the name Oliver and Hart-Parr on the radiator casting. Today this model is known as the unstyled 70. It was built until 1937 as a Row Crop, Standard or orchard model.


Serial Numbers:

Row Crop 18-27 (Single Front Wheel)
1930 100 001 - 102 648
1931 102 649 - 103 300

Row Crop 18-27 (Dual Front Wheels)
1931 103 301 - 103 318
1932 103 319 - 103 617
1933 103 618 - 104 038
1934 104 039 - 104 850
1935 104 851 - 107 311
1936 107 312 - 108 573
1937 108 574 - 109 151

Model 18-28
1930 800 001 - 800 459
1931 800 460 - 800 963
1932 800 964 - 800 984
1933 800 985 - 801 050
1934 801 051 - 801 240
1935 801 241 - 801 989
1936 801 990 - 802 937
1937 802 938 - 803 928

Model 28-44
1930 500 001 - 503 599
1931 503 600 - 506 184
1932 506 185 - 506 211
1933 506 212 - 506 254
1934 506 255 - 506 400
1935 506 401 - 507 175

Model 28-44 & High Compression Special
1936 507 176 - 508 015
1937 508 016 - 508 917

Row Crop 70 (Oliver Hart-Parr Style)
1935 200 001 - 200 685
1936 200 686 - 208 728
1937 208 729 - 216 925

Standard 70 (Oliver Hart-Parr Style)
1936 300 001 - 300 633
1937 600 634 - 301 802