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Caterpillar tractors by year

Also see Challenger.



Caterpillar Tractor History

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

ModelPowerYears
2-Ton27 hp1925 - 1928
5-Ton44 hp1925 - 1926
10-Ton61 hp1925
Sixty81 hp1925 - 1931
Thirty40 hp1925 - 1938
Twenty32 hp1927 - 1931
Fifteen27 hp1928 - 1933
Ten16 hp1928 - 1932
Diesel Sixty85 hp1931 - 1932
Fifty67 hp1931 - 1937
Twenty-Five27 hp1931 - 1933
Diesel Sixty-Fiveunknown1932 - 1933
Sixty-Five72 hp1932 - 1933
Thirty-Five48 hp1932 - 1934
Diesel Fifty73 hp1933 - 1936
Diesel Seventy-Five103 hp1933 - 1935
Diesel Thirty-Five50 hp1933 - 1934
Seventy77 hp1933 - 1937
Seventy-Five103 hp1933 - 1935
Twenty-Eightunknown1933 - 1935
Diesel Forty62 hp1934 - 1936
Forty62 hp1934 - 1936
R235 hp1934 - 1942
R346 hp1934 - 1935
R565 hp1934 - 1940
Twenty-Two32 hp1934 - 1939
RD444 hp1935 - 1940
RD775 hp1935 - 1940
RD8114 hp1935 - 1941
D230 hp1938 - 1957
D457 hp1938 - 1957
R4unknown1938 - 1944
D799 hp1940 - 1961
D686 hp1941 - 1947
D8122 hp1941 - 1974
D9286 hp1955 - 1961
AG4unknown1986
AG6240 hp1986 - 1993
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