The 520 and 620, equipped with yellow stripes, were introduced in the summer of 1956. At this point, John Deere had made the decision to discontinue 2-cylinder engines, but the development of a new engine series still took several years. Therefore, the 520 and 620 still had 2-cylinder gasoline engines. In the 520, only the compression ratio, and consequently the power, had been increased. The 620 had a new engine block and an improved engine design in many respects. The PTO clutch was now, as standard, a separate unit. The new seat suspension was adjustable according to the driver's weight. The 620 model was now equipped with a three-point hitch with a draft control system.

The 520 was available only as a row-crop version. The 620 had a parallel model equipped with a standard front axle.

This is an automated translation. Please report any issues in the translation.