One of the significant factors influencing the operation of the tractor is the unsteady load that occurs when starting off, during the initial period of acceleration and deceleration. The elastic-damping mechanisms are used to reduce the negative consequences of such loads. Scientists still develop and study their application. In this article, the analysis of the cross correlation function and the analysis of the mutual spectral density of two processes were carried out. The analyzed process-es were the engine crankshaft speed and the drive wheel speed. This analysis shows the change in the speed of the passing load frequencies along the shaft line of the traction class 1.4 wheeled trac-tor power transmission, where an elastic-damping mechanism is installed. The studies were carried out for the operating conditions of a tractor with a seeder. The purpose of the study was to deter-mine the effect of the elastic-damping mechanism installed in the power transmission of a tractor on its operation with a trailed seeder. In the general case, the object of research is the functioning of a tractor of traction class 1.4 process, which is located in a unit with a seeder. Analysis of the mutual correlation function of the two processes showed a change in the speed of the passing load frequen-cies along the shaft line. The ratio of the propagation time of the disturbance signal in the experi-mental tractor in relation to the production version along the shaft line when aggregating the tractor with the seeder decreases by 40.1%. The analysis of the mutual spectral density shows a shift in the frequency of disturbing influences in relation to the serial version and a decrease in their value when the tractor is aggregated with a seeder by 33.3%. The value of the mutual spectral density is lower in the experimental version of the tractor, which may mean that the elastic-damping mechanism, as an element of the power transmission, absorbs part of the load fluctuations and reduces their propagation speed along the shaft line.

Improving the operational efficiency of mobile energy vehicles is one of the main factors contributing to increased productivity while significantly reducing non-productive energy costs. Of no small importance are developments that are associated with the improvement of the design of transmissions of wheeled agricultural mobile energy vehicles, for which an indispensable condition is to increase labor productivity in agricultural production. The achievement of the required characteristics of mobile energy vehicles is determined by the properties of the transmission, as well as the interaction of the systems associated with it. One of the main qualities of the transmission is the ability to absorb torsional vibrations and damp the load. The article presents studies on establishing the constructive improvement of the transmission of a mobile energy vehicle by installing a developed elastic-damping mechanism in it using the example of a tractor of a small traction class. Taking into account the relevance of the topic under discussion in this article, it is necessary to determine the effect of the elastic-damping mechanism installed in the tractor transmission on its operation with a transport trailer, based on the field measurements carried out using the method of correlation — spectral analysis. The purpose of the study was to determine the effect of the elastic-damping mechanism installed in the power transmission of a tractor on its operation with a transport trailer. In this article, the analysis of the cross-correlation function and the analysis of the mutual spectral density of two processes were carried out: the engine crankshaft speed and the drive wheel speed. The analysis of the cross-correlation function shows the change in the propagation speed of the passing frequencies of load oscillations along the shafting by 39%. The analysis of the mutual spectral density shows that there is an absorption of a part of the load fluctuations propagating along the shafting and a shift in the frequency of disturbing influences by up to 68.3%.