John Deere 4020 Overview Engine Transmission Dimensions Photos Tests Attachments 1963 - 1972 New Generation Series Row-Crop tractor Series map: 4230↑ 1973-1977 4000 4020 4320 107.7hp* 101.3hp* 127.8hp* 4010↓ 1960-1963 *Estimated engine power for comparison only. Production Manufacturer John ...