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When laying mineralized strips in forest soils, the working body meets with stumps and roots, the tractor unit overcomes areas of increased load, which have different characteristics in terms of resistance moment amplitudes and durations. The unit in the process of operation is a mechanical system "energy medium + tool + external environment". To achieve optimal performance of aggregates, the parameters of their dynamic systems should be close to the dynamics of the forces of resistance to movement. Substantiation of its energy and dynamic parameters, when the technological process takes place with long-term energy-intensive load fluctuations on the working organ, it is necessary to find links between the dynamic characteristics of the energy means, tools and the external environment. Load fluctuations cause a decrease in the engine load factor of the power vehicle and its efficiency. It follows from this that the determination of the optimal design parameters of the unit and its working body, as well as operating modes, is automatic. The purpose of theoretical research should be to substantiate the possibilities of overcoming overloads when the working body meets the stump due to the kinetic energy of the rotating masses of the engine and the transmission, to determine the optimal energy and dynamic parameters of the unit. At the same time, a methodology for studying the behavior of a dynamic system under the influence of an unsteady load should be developed. Based on the study of the interaction of the unit, as a dynamic system, with the external environment, the optimal parameters of the tractor for planting forest crops, caring for them, and other low-energy-intensive work, ensuring an increase in its productivity and a reduction in the cost of work, are justified. [ABSTRACT FROM AUTHOR]