The analysis of the Russian market of agricul-tural tractors which basis is made by the model ranges of power saturated mobile power means of the wheel formula 4k4a of the improved classical configuration with the increased diameter of the operated wheels constructed on nominal opera-tional engine capacity was carried out. For effective use of such tractors in modern technologies of till-age and seeding the need of regulation and rational distribution of operational weight on leading bridges was shown. The basic principles and methods of rational ballasting of tractors for adaptation to oper-ational technologies of tillage on the basis of creat-ed models and the developed algorithm with the use of the main indicator of technological effective-ness, i.e. specific material capacity (weight) as the parameter of optimization were proved. On the ba- sis of the results of the experiment and modeling specific material capacity of the tractors of different complete sets was defined and its rational distribu-tion on the leading bridges for each group of relat-ed operations of tillage was proved. Initial for bal-lasting the basic complete set of the tractor with rated capacity on unary wheels and with a mini-mum specific weight of 51.5 kg/kW without remov-able ballast for the performance of low-power-intensive operations of the surface treatment of the soil and direct crops with the maximum working speed of 3.33 m/s (12.0 km/h) referred to the third group was accepted. The options of placement of ballast freights ahead of the skeleton were given in lobbies and back wheels which provide the tractor with basic complete set adaptation and on dual wheels to more power-intensive related operations of tillage of the first and second groups at values of rated speed of 2.20 and 2.70 m/s. The technique of definition and rational distribution of specific weight on axes due to ballasting for different technologies of tillage was recommended when using tractors with a power of 140-280 kW.