In the autumn of 1983, Maaseudun Kone's Progress cab and silver coloring were introduced also to the larger Belarus models. At the same time, especially in the larger model, several changes were made, which resulted in the model number increasing by five steps. The power rose to 85 horsepower, and the transmission ratios were altered so that the top speed increased close to forty km/h. The lifting capacity was also higher than before.

Here, only the models sold in Finland and Sweden are presented, where the 100 hp model was equipped with a turbo installed in Finland. At the same time, the factory also introduced more powerful models (MTZ-100, 1060/1062), which featured a 24+8 transmission as well as smaller series direct injection versions 570/572. Other versions than those presented here also came to Finland through unofficial importers.

In 1988 and 1989, models named Agrossi, equipped with Soviet-made cabs, were again brought to the Finnish market; these soon supplanted the more expensive Progress models. Agrossi could be optionally equipped with an electronic hydraulic system for the three-point hitch, developed by the Danish Belarus importer. The 526 HX, equipped with a direct injection diesel engine and a reduction fast gear, entered the Finnish market in 1990. Its gear shifting was modified to follow the normal H-pattern.

In 1994, the engine was improved, including replacement of the injection pump. At the same time, the brakes were enlarged and a domestic valve block for the external hydraulics was installed in Finland.

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