The studies talk about the features of moldboard and milling tillage. An analysis of current trends in the field of soil cultivation allows us to conclude that currently special attention is paid to reducing the energy intensity of the processing process. Forestry machines with bar working bodies have undoubted advantages over moldboard and milling machines, since during their operation they require much less power. Two transmission schemes were considered - chain and branched. When considering chain circuits with several variants of flywheels and passive working bodies, significant amplitudes of oscillations in transmissions appeared in the region of natural frequencies, and resonance phenomena when the frequencies of forced oscillations coincided with natural ones. Calculations have shown that an increase in the moment of inertia of the tractor engine flywheel by 3.14 times does not have a significant effect on the change in the natural frequencies of oscillations in the propulsion drive transmission, but causes them to decrease by 1.4 times. It follows that when the moments of inertia of rotating masses change, it is necessary to analyze the vibrations that occur in branched transmissions with active bar working bodies with significant moments of inertia.