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The term "Dubuque" refers to the John Deere Dubuque Works and ANY tractor that was made there. The "M","MT","40", "420", "430", "435" and "440" tractors are "Dubuque" tractors, as opposed to the "Waterloo" tractors which of course were built in Waterloo, Iowa. The "1010", "2010", "1020", "1520","2020", "1530", "2030", "2630", "2440" and "2640" tractors built in Dubuque are ALSO "Dubuque" tractors. Production of AG tractors was discontinued in 1980, about halfway through the production run of the "2440" and "2640" tractors, so anything built after sometime in 1980, which is a John Deere utility tractor would NOT be a "Dubuque" tractor but would be a "Mannheim (Germany)" tractor. All of the two cylinder engines made there were of the vertical arrangement. They also made 3,4, and 6 cylinder engines there. The engines found in the 2510 and 2520 are the same as found in the 2020 and 2030. ALso, the 6329 diesel and 6303 gas engines found in the 4030 tractor were DUBUQUE engines even though, like the 2510 and 2520, the 4030 was built in Waterloo. Also, the 435 and 440 tractors equiped with diesel engines had Detroit Diesel, GM built 2-53 engines, but the tractors are considered to be "Dubuque".
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