EN
Demands imposed to exploitation systems of agricultural tractors and machinesare more and more often considered and formulated. It was found that effectivity of technical objects decreases, in many cases, due to high exploitation inputs, which often exceed the inputs of designing and manufacturing. High expolitation inputs can be decreased by quality improvement of technical objects in the subsystem of their utilisation and maintainance. To achieve this purpose, there is need for rational, base don scientific bases, exploitation of technical objects.