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 was built from 1924 until 1925. It was then replaced with the 16-30F. Few changes were made but the F model had closed spur gears and the band clutch was replaced with a disc clutch. The 16-30F was only built in 1926.

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 2-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 3-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