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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.