In addition to the advanced engine technology, the "10" series tractors offered many other upgrades from the older two-cylinder models they replaced, including significantly higher horsepower-to-weight ratio, advanced hydraulics, more convenient and comfortable operator stations, and many other improvements. Of the "10" series John Deere tractors introduced in 1960, the 4010 was by far the most popular, with more than 58,000 units sold from 1960 to 1963. The success of the "10" series John Deere tractors, led by the 4010, helped propel John Deere from a 23% market share in 1959 to 34% by 1964 when the 4020 was introduced, making it the top manufacturer of farm equipment in the United States.