Caterpillar farm tractors by power

Related brands: Challenger.

Caterpillar Twenty-Two tractorThe Caterpillar Tractor Company was formed in 1925 with the merger of the Holt and Best companies. Both had been independently developing and manufacturing tracked machinery, Holt having acquired the patents of the Hornsby company of England, which had also developed early tracked steam engines. Although heavily involved in the farming market during the early and mid 20th century, Caterpillar began to focus on construction equipment as tractors with rubber tires came to dominate the farming market. In 1987, Caterpillar rentered the agricultural market with the Challenger line of rubber-tracked tractors. In 2002, Caterpillar sold the line to AGCO who manufacture the tractors under the AGCO Challenger brand and sell through Caterpillar dealers.

Caterpillar Inc. - offical site
AGCO Challenger - official site
AMCOC - Antique Caterpillar Machinery Owners Club
Antique Caterpillar Machinery Enthusiasts - antique Cat forums
Caterpillar Skid-steer loaders - information on Caterpillar skid-steer loaders at DiggerData.com

Also Caterpillar Industrial tractors Skid-steer loaders
Sort tractors by Model, Factory or Series
ModelPowerYears
Ten15 hp[B]1928 - 1932
Fifteen22 hp[B]1929 - 1933
2-Ton27 hp[B]1925 - 1928
D230 hp[P]1938 - 1957
Twenty-Two32 hp[B]1934 - 1939
Twenty32 hp[B]1927 - 1931
Twenty-Five33 hp[B]1931 - 1933
R236 hp[B]1934 - 1942
R440 hp[B]1938 - 1944
Thirty40 hp[B]1925 - 1938
Twenty-Eight41 hp[B]1933 - 1935
D444 hp[B]1938 - 1959
RD444 hp[B]1935 - 1940
5-Ton44 hp[B]1925 - 1926
R346 hp[B]1934 - 1935
Thirty-Five48 hp[B]1932 - 1934
Diesel Thirty-Five50 hp[B]1933 - 1934
Forty54 hp[B]1934 - 1936
10-Ton61 hp[B]1925
Diesel Forty62 hp[B]1934 - 1936
R564 hp[B]1934 - 1940
Fifty67 hp[B]1931 - 1937
Diesel Fifty73 hp[B]1933 - 1936
RD775 hp[B]1935 - 1940
Seventy77 hp[B]1933 - 1937
Sixty81 hp[B]1925 - 1931
Diesel Sixty85 hp[B]1931
Diesel Sixty-Five85 hp[B]1931 - 1932
D686 hp[B]1941 - 1947
Sixty-Five87 hp[B]1932 - 1933
D799 hp[B]1940 - 1961
Seventy-Five103 hp[B]1933 - 1935
Diesel Seventy-Five103 hp[B]1933 - 1935
RD8114 hp[B]1935 - 1936
D8115 hp1937 - 1965
AG6240 hp1986 - 1993
D9286 hp1955 - 1959
AG4unknown1986
[B]: Engine power estimated from belt horsepower. [P]: Engine power estimated from PTO horsepower. See individual tractor data listing for power details.

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