Another of John Deere's "20 Series" tractors so named because they produced approximately 20% more power than the models they replaced, the 520 took the place of the Model 50. It was a general purpose 3 plow tractor available with wide, single, or tricyle front end. Buyers could also chose from gasoline, LP gas or All Fuel engines. Priced at about $2,300 you could, for an additional $38.50, order the optional Float Ride seat.