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The work of the air-and-screen cleaner of a grain combine harvester is considered. Flows of grainstraw heap supplied for cleaning are evaluated. The methods of splitting the heap into grain and nongrain parts are described. To improve the work of the grain combine harvester cleaner, several design solutions are proposed that make possible an intensified fractionation of straw-grain heap. In the modified design of the lipped screen, the combs of the upper working sections of neighboring louver boards are offset by one half of the comb pitch The paper outlines the technological process of air-screen cleaning in a combine harvester. The uniformity of the air flow in the cleaning of the combine, which ensures the efficiency of the work, is considered. The authors give account of straw-grain flows supplied for cleaning in the form of a heap. The ways of dividing the heap into grain and the non-grain part are shown, in particular. To improve the cleaning process in a combine harvester, a number of design solutions have been proposed, which makes it possible to intensify the process of dividing straw-grain heaps into fractions. This provides for an increased heap division into grain and nongrain parts. To isolate small impurities, an additional fine-mesh sieve is installed in the cleaning system between the lower sieve and the inclined bottom. This is relevant when cleaning clogged weeds of crops. Grain falls on this sieve and slides over it to get to the grain auger, while fine impurities pass through the sieve. In order to remove these impurities from the cleaning system, a sluice gate is installed at the lower end of the inclined bottom. Such a design of the cleaning system allows obtaining cleaner grain in the combine harvester, which will result in reduced energy consumption in its post-harvest processing.

Experimental determination of ploughing quality and energy consumption carried out on loamy soils most common for the arable lands in European part of Russia. The field tests done for three standard types of mouldboard body surfaces: cultural, semi-helicoidal (cylindroid) and helicoidal. Results shows that bodies with cylindroid mouldboard surface had better soil crumbling against cultural (digger) body surfaces. Helicoidal bodies supplied better quality of soil layer turnover than cultural and semi-helicoidal ones. Designed plough construction allowed change ploughshares installation angles relative to the furrow line from 25 to 55°. Optimal ploughshares angle to the furrow line obtained 45…50°. The traction resistance force of the plough equipped with helicoidal bodies was measured 6…8% lower than cultural bodies and 3…4% lower than cylindroid ones at tractor speed 2.5…3.0 m-s-1.

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Method of determination of optimal service-area radius for machinery recycling enterprise is presented. Specific operational costs during transportation of recycled machinery, is calculated. Allocation scheme of such enterprises within the Moscow region territory is proposed.