By mid-decade, John Deere updated their entire line with more power and features, that this series essentially took them into the 70s. So, in 1963, John Deere rounded out the line with the "5010." It had 106 HP compared the "8020's" 150 HP, but it cost a third less at $10,730. But even its 72 HP engine wasn't enough for large western wheat farmers. All of these models had four-cylinder engines except for the "4010" with a six. But the horsepower went up from 22 to 30 for the same dollars. For instance, at the bottom of the line, both the old Model "330" and the new "1010" cost around $2,200. All of these models were priced at about the same level as their predecessors and so were very attractive. Then, in 1961, the "3010" was marketed with 51 HP and the "1010" with 30 HP. The "2010" with 39 HP and the "4010" with 72 HP were the first models out. In 1960, Deere heralded the new decade with a new series, all with either four or six cylinder engines.
But it signaled a new beginning for Deere. At more than $30,000, it was also 5½-times more expensive than any previous model, and so probably less than 100 of the "8010/8020" model line sold. That was three times the number of cylinders in any previous Deere tractor and more than double the horsepower. In the fall of 1959, John Deere shocked the tractor business when it introduced the huge Model "8010." With a six-cylinder diesel motor purchased by Deere from General Motors, the "8010" produced at least 150 horsepower at the drawbar and could pull eight plows at seven miles per hour. The series got upgraded power ratings and a host of features for comfort and ease of use. Buyers in 1958 didn't know it yet, but the new 30 Series tractors were to be the last two-cylinder series. These were simple engines that could produce remarkable power.
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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