The study aimed at qualification of the criteria for selecting the suspension system parameters for wheeled agricultural tractors and for evaluating their quality at the stage of engineering design. The problem to be solved consists in fact that both, ergonomic and technical standards (such as ISO and GOST), comprise the qualitative characteristics of suspension system only, whereas constructor designing new product needs the numerical values of particular parameters. A proposal was suggested to divide all the criteria dealing with the tractor suspension system into four groups, such as: - criteria for evaluating tractor steerability, safety and braking ability, - criteria for evaluating the loads of transmissions and construction elements of the tractor, - criteria concerning the tractor driver’s comfort, - criteria for evaluating tractor performance quality. Analysis of some research works considering the problems of spring suspension systems enabled to determine the quantitative criteria for evaluating suspension system for each group. Majority of the criteria for evaluating the quality of spring suspension system are applied to instantaneous values of tractor wheel resistance forces and to kinematic parameters (displacement, velocity, acceleration) for characteristic points of machine framing construction. The application of these numerical values is convenient both, at mathematical modelling with the use of „automatic design system” and during practical testing of the machine spring suspension system.
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