Many people saw the john deere 4020 as revolutionary when it came to farming unlike other tractors at the time the jd forty twenty came with new driver protection a roll over guard that helped pave the way for safer farming not only did the 4020 offer improved protection but it also offered easy attachment of dual rear tire for extra traction. John deere 4020 tractor hp price review specs history serial numbers weight features images the john deere 4020 was an agricultural tractor model built by john deere manufacturing company from 1964 to 1972. Remember writing review of the john deere 4020 tractor write another of its pros and cons write your review on the purchase price of the john deere 4020 tractor and the costs associated with its use and servicing be as it uses during the harvest and typical field work write about your own experiences with the use or the experience of friends