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The article discusses the issues of reducing the productivity of grain cleaning machines as a result of clogging holes with seeds of the culture being cleaned and impurities. The analysis of indicators reflecting the clogging of sieves and their throughput is given. It is noted that the reduction of the clogging of the sieves is provided by the use of additional devices, the work of which is aimed at removing stuck seeds from the sieve cells. In order to determine the relationship between the physical and mechanical properties of seeds and the modes of operation of the sieve that affect the clogging of the sieves, an analysis of the forces holding stuck seeds in the cells of the sieve is given. Which showed that the main force holding the stuck seeds in the cells is the friction force. Gravity and elasticity have a significant influence on the amount of friction force of the seed against the cell walls. Graphs of the dependence of the change in the force pushing the grain through the hole on the angular frequency of the sieve oscillations are obtained. In addition, graphs of the dependence of the change in the force to be applied to the grain wedged in the sieve on the relative deformation of the grain are constructed. The obtained research results allow us to substantiate the parameters of devices for cleaning sieves, which will increase the productivity and quality of the products obtained. [ABSTRACT FROM AUTHOR]