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    Caterpillar Tractor History

    caterpillar/22-01.jpgThe Caterpillar Tractor Company was formed in 1925 with the merger of the Holt and Best companies. Both had been independantly 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 reentered 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

    1920 - Caterpillar tractors
    2-Ton 5-Ton 10-Ton
    Sixty Thirty Twenty
    Fifteen Ten  

    1930 - Caterpillar tractors
    Diesel Sixty Fifty Twenty-Five
    Diesel Sixty-Five Sixty-Five Thirty-Five
    Diesel Fifty Diesel Seventy-Five Diesel Thirty-Five
    Seventy Seventy-Five Twenty-Eight
    Diesel Forty Forty R2
    R3 R5 Twenty-Two
    RD7 RD8 D2
    D4 R4  

    1940 - Caterpillar tractors
    D7 D6 D8

    1950 - Caterpillar tractors

    1980 - Caterpillar tractors
    AG4 AG6  

    Unknown year - Caterpillar tractors

    1980 - Challenger tractors

    1990 - Challenger tractors
    65B 75 65C
    75C 85C 35
    45 65D 70C
    75D 55 85D
    65E 75E 85E

    2000 - Challenger tractors
    MT425 MT445 MT455
    MT465 MT535 MT545
    MT565 MT635 MT645
    MT655 MT665 MT735
    MT745 MT755 MT765
    MT865 MT225 MT255
    MT265 MT275 MT285
    MT295 MT425B MT445B
    MT455B MT465B MT525B
    MT535B MT545B MT555B
    MT565B MT225B MT255B
    MT265B MT275B MT285B
    MT295B MT297B MT635B
    MT645B MT655B MT665B
    MT745B MT755B MT765B
    MT835B MT845B MT855B
    MT865B MT875B MT315B
    MT325B MT335B MT345B
    MT525B MT535B MT545B
    MT555B MT565B MT575B
    MT945B MT955B MT965B
    MT975B MT425B MT445B
    MT455B MT465B MT475B
    MT645C MT655C MT665C
    MT675C MT685C MT755C
    MT765C MT835C MT845C
    MT855C MT865C MT875C
    MT945C MT955C MT965C

    2010 - Challenger tractors
    MT585B MT595B MT645D
    MT655D MT665D MT675D
    MT685D MT555D MT565D
    MT575D MT585D MT595D
    MT755D MT765D MT515D
    MT525D MT535D MT545D
    MT455D MT465D MT475D
    MT485D MT495D MT645E
    MT655E MT665E MT675E
    MT685E MT755E MT765E
    MT775E MT845E MT855E
    MT865E MT875E  

    Unknown year - Challenger tractors
    MT835 MT845 MT855

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