In 1973, the Belarus models MTZ-501 and 521 received a Swedish Fernmo cab.

In 1975, the more powerful MTZ-80/82 equipped with a direct injection diesel engine, introduced in 1972, went into production. It featured a 1000 rpm power take-off, which was engaged with a key located underneath the tractor. The transmission included a mechanical overdrive that doubled the gears to 18+4 and provided a road speed of 33 km/h. The differential lock released automatically when the wheels were turned. There were three standard hydraulic outlets.

In the autumn of 1977, the cab was replaced with one manufactured by Maaseudun Kone, and the steering became hydrostatic. According to the advertising text, good visibility, light steering, a warm workplace in winter and fresh in summer, combined with thoughtfully positioned controls, were the defining features of the Belarus. Opinions on the placement of the controls may vary, but at least the steering wheel position was significantly improved. New was also the white color. Turbos were installed in the 505/525 models in Finland, increasing the power to 75 hp.

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