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The results of the field research studying the effects of aggregates with heavy payload machines on the soil are presented. The influence of maximum tire pressure on soil while changing the pressure in a wide range is analyzed. The main characteristics of the machines, such as total mass; running gear load level; tire air pressure; maximal pressure on soil; soil density and the dip of the machine's track are shown. The experiment has been made on different soil types. Changes of relative strain of loose and solid sandy clay are displayed. Dependence of soil density is evaluated on maximal tire pressure on the soil while different wheel trace. The research show that use of agricultural machines' tires with pressure equal 200 kilopascals instead of 370 kilopascals decline the influence of running gear on soil but doesn't solve the problem of soil preconsolidation.
