Wide span tractors/vehicles have good prospects as the mechanisation means for controlled traffic farming. The efficiency of the practical application of wide span tractors (vehicles) depends on the availability of the substantiated scientific basis or the theoretical basis for the research into their key properties, including among other factors the smoothness of movement. The aim of the research is to improve the smoothness of movement of wide span tractors (vehicles) by substantiating their configuration, design-and-process and other parameters as well as the properties of the longitudinal profile of the agricultural background irregularities in the ruts of the laid-down process track. The smoothness of movement of the wide span tractor (vehicle) as a dynamic system travelling in the ruts of the permanent process track substantially depends on the structure of the latter's longitudinal profile, the stiffness of tyres on the supporting wheels, while the dynamics of the vertical oscillations of the process section depends on its operating weight.

The pipe conveyor belt design principles are considered in these pages. A method of calculation is suggested for the load on the base support rollers resulting from the bending of the initially plane belt into a cylindrical shell for the circular cross-section upon the elasticity theory with a non-uniform modulus, considering elongation and contraction variations in the elasticity modulus of the belt inserts which are positioned above and below the neutral surface at bending.

In terms of the future development of the mechanization and automation of the agricultural production, the transition from the narrow-gauge towing tractor to the wide-span (gantry) traction and power unit, also called the agricultural gantry system, seems to be a promising trend. For the purpose of combining implements with the agricultural gantry system with the use of a manifold power take-off system, it is necessary to undertake theoretical research into such power units with regard to their suitability for their functional purpose. The aim of the investigations was to analyze the laws governing the effect that the parameters and operation conditions of agricultural gantry systems have on their power balances and at the same time to outline the principal trends for the development of the theory of such machines with that aim in view. As a result of the investigations, it has been established that the power intensity rate of such agricultural gantry systems travelling at working speeds within a range of 10 km•h -1 is equal to 23.5 kW•t -1 . Also, the agricultural gantry system is capable of producing a traction force of 6.37 kN•t -1 of its operating mass provided that a sufficient grip of its undercarriage on the surface of the permanent process track is ensured.

Mechanical processing of materials is critical to assessing the quality of processing accuracy. For machine elements determining the dimensions and tolerances are the most important dimensions of their surfaces, which work together. The shape-and position tolerances may raise the existence of failures in the performance and mechanisms of agricultural machinery. We hereby propose a method for the construction of small dimensional dynamic models, on the basis of which the modelling of the technological systems of mechanical processing is accomplished. It is necessary for increasing the manufacturing precision of these components.

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