![]() The Model "40" was at the bottom of the line with 23 HP on the drawbar. John Deere decided to abandon their confusing letter system for a numbered system of increasingly more powerful machines. By 1952, the last vestiges of wartime restrictions were gone and the tractor market had become a highly competitive battle between powerful companies. The Model "M" was added in 1947 with a hydraulic mechanism. The more powerful row crop Model "G" was added in 1937. To meet the needs of row crop farmers, John Deere had relied on the Models "A" (with 28 HP) and "B" (with 17 HP) from the mid 30s into the 50s. Because the company wasn't sure that the "R" would sell well, they kept the "D" in production well into the 50s. The "D" was the top of the line until the Model "R" was introduced in 1949 powered by Deere's first diesel engine. It had been adapted from the original Waterloo Boy tractor in 1923 and was in continuous production until 1953, selling 160,000 units. As the 50s began, John Deere's tractor catalog featured from the lowest horsepower ratings to the highest the "B," the "M," the "A," the "G," the venerable "D" and the new "R." The Model "D" was the granddaddy of the entire line.
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