Under operating conditions, the power plant of a machine-tractor unit experiences changes in a wide range of changes in speed and load conditions. The vibrations arising from this, in addition to discomfort and additional loads on the components and mechanisms of the power plant, also cause excessive fuel consumption and power loss. Reducing the negative impact of vibration on effective performance of a power plant is proposed by creating supports with adjustable characteristics. The stiffness and damping coefficients were selected as the determined parameters. For tractor power plants, taking into account their layouts and design features, a design scheme with two attachment points in front with vertical movement and one hinge point at the rear was selected. As disturbing moments, we consider both the internal imbalance of the power plant itself and the external effects of the variable resistance moment and the shock of the supports themselves. Changes in the stiffness and damping coefficients of the supports used make it possible to reduce the oscillation amplitudes of the power plant under variable operating conditions, which will improve its utilization rates.