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To increase the efficiency of using agricultural powered machinery, it is necessary to improve the switching mechanism on the power take-off shaft. On tractors produced by the Minsk Tractor Plant, the power take-off drive is switched on by braking the power drum by tensioning the brake belt of a mechanical drive. The operation of such a switching mechanism leads to rapid wear of the brake belt due the belt impact on the drum during switching leads to an uneven decrease in the frequency of rotation of the drum. At the same time, during the standard on-time, the drum makes a significant angular displacement. This leads to significant wear of the friction lining of the belt. It is proposed to use electromagnets, instead of a mechanical drive, for tensioning the brake belt, which at the moment of switching on will press it against the switching drum in a mode that ensures a decrease in the angular displacement of the drum and, accordingly, ensures significantly less wear on the friction lining. A mathematical model of the angular displacement of the drum is proposed, on the basis of which an analytical expression for the belt wear rate is substantiated. Electromagnets must be connected through a microprocessor device that provides a change in the force of pressing the belt to the drum, at which the required intensity of reducing the angular velocity is achieved. In this case, the power of the agricultural machine drive will be taken into account. This mode of switching the power take-off drive will increase the service life of the brake belt. In this case, as the friction lining wears out, the braking efficiency will increase. This will require appropriate programming of the microprocessor control device for the electric drive to activate the power take-off shaft. Entering of inclusion of the wear maximum values of brake belt friction lining into the control module of the electric drive the will automate the processes of monitoring the technical condition and predicting the residual life of the belt to the maximum state. Keywords—power take-off shaft, switching mechanism, microprocessor device electric drive.

The Interrelation of Information System Characteristics and Parameters of Controlled Processes