The 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.
Model Power Years
No photo available Caterpillar 10-Ton 61hp 1925 -
Caterpillar 2-Ton tractor photo Caterpillar 2-Ton 27hp 1925 - 1928
Caterpillar 5-Ton tractor photo Caterpillar 5-Ton 44hp 1925 - 1926
No photo available Caterpillar AG4 0hp 1986 -
Caterpillar AG6 tractor photo Caterpillar AG6 240hp 1986 - 1993
Caterpillar D2 tractor photo Caterpillar D2 30hp 1938 - 1957
Caterpillar D4 tractor photo Caterpillar D4 57hp 1938 - 1957
Caterpillar D6 tractor photo Caterpillar D6 86hp 1941 - 1947
Caterpillar D7 tractor photo Caterpillar D7 99hp 1940 - 1961
Caterpillar D8 tractor photo Caterpillar D8 122hp 1941 - 1974
Caterpillar D9 tractor photo Caterpillar D9 286hp 1955 - 1959
Caterpillar Diesel Fifty tractor photo Caterpillar Diesel Fifty 73hp 1933 - 1936
No photo available Caterpillar Diesel Forty 62hp 1934 - 1936
No photo available Caterpillar Diesel Seventy-Five 103hp 1933 - 1935
No photo available Caterpillar Diesel Sixty 85hp 1931 - 1932
No photo available Caterpillar Diesel Sixty-Five 0hp 1932 - 1933
No photo available Caterpillar Diesel Thirty-Five 50hp 1933 - 1934
No photo available Caterpillar Fifteen 27hp 1928 - 1933
No photo available Caterpillar Fifty 67hp 1931 - 1937
No photo available Caterpillar Forty 62hp 1934 - 1936
No photo available Caterpillar R2 35hp 1934 - 1942
Caterpillar R3 tractor photo Caterpillar R3 46hp 1934 - 1935
No photo available Caterpillar R4 0hp 1938 - 1944
No photo available Caterpillar R5 65hp 1934 - 1940
Caterpillar RD4 tractor photo Caterpillar RD4 44hp 1935 - 1940
No photo available Caterpillar RD7 75hp 1935 - 1940
No photo available Caterpillar RD8 114hp 1935 - 1941
Caterpillar Seventy tractor photo Caterpillar Seventy 77hp 1933 - 1937
Caterpillar Seventy-Five tractor photo Caterpillar Seventy-Five 103hp 1933 - 1935
Caterpillar Sixty tractor photo Caterpillar Sixty 81hp 1925 - 1931
No photo available Caterpillar Sixty-Five 72hp 1932 - 1933
Caterpillar Ten tractor photo Caterpillar Ten 16hp 1928 - 1932
Caterpillar Thirty tractor photo Caterpillar Thirty 40hp 1925 - 1938
No photo available Caterpillar Thirty-Five 48hp 1932 - 1934
Caterpillar Twenty tractor photo Caterpillar Twenty 32hp 1927 - 1931
No photo available Caterpillar Twenty-Eight 0hp 1933 - 1935
Caterpillar Twenty-Five tractor photo Caterpillar Twenty-Five 27hp 1931 - 1933
Caterpillar Twenty-Two tractor photo Caterpillar Twenty-Two 32hp 1934 - 1939