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Cross Motor Hart-Parr Tractors

Following the failure of the Little Devil, the Hart-Parr Company came out with a newly designed model, the 12-25. This tractor was also known as the New Hart-Parr. After some improvements had been made, the tractor was re-rated as a 15-30A but was referred to as the “30.” It was built until 1922.


The next new model was the “20” or the 10-20B. The tractor was a smaller version of the “30” and was powered with a 2-cylinder crossmotor. It was built until 1922.


In 1922, the “30” was revised and became the 15-30C. The frame was made of channel iron, while the previous models used a cast iron frame. However, the engine remained the same. This model was built until 1924 when it was replaced by the 16-30E.

In 1922, the “20” was also revised. It became the 10-20C and also used the channel iron frame. The engine bore increased on this model, while the stroke remained the same. This tractor was built until 1924.


In 1923, Hart-Parr introduced the “40” or the 22-40. The “40” used two 10-20 engines side by side and was known as the Twin-Two engine. This model was produced until 1927.


The 16-30E replaced the 15-30C and was built from 1924-1926. Few changes were made, but the 16-30 had closed spur gears, and the band clutch was replaced with a disc clutch. The 16-30E was replaced by the 16-30F in 1926. This model was built less than a year before it was replaced by the 18-36G.


In 1924, the 10-20C was replaced by the 12-24E. It incorporated the same changes with the clutch and gears that the 16-30F had. It also used a new steering system with an enclosed gear set. This model was built until 1926.


Production of the 18-36G began in 1926. It eventually evolved into the 18-36G & H and went through several changes before being retired in 1930. The tractor was classified as a 3-4 plow tractor.


The 12-24G (1926-1927) began with an increased engine size. It used a two-speed transmission. It evolved into the 12-24H with a 3-speed transmission in 1927 and was produced until 1930.

The 28-50 replaced the 22-40 and was the last true Hart-Parr model to be released. This tractor also used the twin-two engine with two 12-24H blocks side by side. The 28-50 had a two-speed transmission, but a three-speed could be purchased as an option.

Serial Numbers

New Hart-Parr (12-25) 

& Model 30 (15-30 A)

1918- 8 401 - 9 001

1918- 9 201 - 9 32

1919- 9 383 - 13 017

1920- 13 018 - 14 198

1920- 15 550 - 18 474

1921- 18 475 - 18 8411

1922- 18 842 - 19 125

Model 30 (15-30 C)

1922 21- 001 - 21 392

1923 21- 393 - 21 864

1924 21- 865 - 22 300

Model 16-30 E

1924- 22 501 - 22 600

1925- 22 601 - 24 000

Model 16-30 F

1926- 24 001 - 26 000

Model 18-36 G

1926- 26 001 - 26 361

1927- 26 362 - 28 850

Model 18-36 H

1927- 28 851 - 29 635

1928- 29 636 - 33 752

Model 18-36 I

1928- 33 753 - 34 566

1929- 34 567 - 35 000

1929- 85 001 - 89 159

1930- 89 160 - 90 698

Model 20 (10-20 B)

1920- 35 001 - 35 024

1921- 35 025 - 35 199

1922- 35 200 - 35 319

Model 20 (10-20 C)

1922- 35 501 - 35 521

1923- 35 522 - 35 749

1924- 35 750 - 35 922

Model 12-24 E

1924- 36 001 - 36 074

1925- 36 075 - 36 580

1926- 36 581 - 37 100

Model 12-24 G

1926- 37 101 - 37 189

1927- 37 190 - 37 900

Model 12-24 H

1927- 37 901 - 38 118

1928- 38 119 - 39 686

1929- 39 687 - 42 278

1930- 42 279 - 43 253

Model 40 (22-40)

1923- 70 001 - 70 019

1924- 70 020 - 70 094

1925- 70 095 - 70 250

1926- 70 251 - 70 490

1927- 70 491 - 70 500

Model 28-50 (Narrow Radiator)

1927- 70 501 - 70 741

1928- 70 742 - 70 951

Model 28-50 (Wide Radiator)

1928- 70 952 - 70 967

1929- 70 968 - 71 401

1930- 71 402 - 71 701

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