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The present article addresses issues related to the development of a scientifically-based classification of agricultural tractors with consideration of problems associated with international harmonization of testing requirements and classification parameters; it describes the disadvantages of classification of tractors by maximum towing power achieved on a concrete surface, which is used abroad. The authors state the requirements for towing and power classification of agricultural tractors, which should act as a framework for energy harmonization of sets of tractors with sets of machines independently from developers and manufacturers; and demonstrate the need for harmonization of typical size classification series of towing and power parameters with series of preferred numbers recommended by International Organization for Standardization (ISO).

The objective of this study is to identify the most popular agricultural tractor models in Russia by their engine ratings and countries of origin. This review presents an analysis of changes in the composition of engine-ratings and sales volume of agricultural tractors in the Russian market between 2008 and 2014. Including knock-down kits, the countries of origin are Russia, the CIS-countries and non-CIS Countries. The variety of manufacturers, highlight the leading international companies which have supplied up to 200 units is discussed. The papers shows that CIS-manufactured tractors represent the greatest number in the market - up to 57 per cent, tractors from non-CIS countries occupy up to 12 per cent of the market, and the number of Russian models is quite limited - 3.0 per cent in 2012 and 3.4 per cent in 2014.