The article presents a kinematic analysis of a front bucket loader with a center pivot frame articulation. Due to the action of external loads, the values of reactions occurring on loader motor and loading axles are determined. The article contains the results of theoretical and experimental researches of the load allocation along the tractor axles on the basis of the cargo mass and the hoisting height. The dependencies of the force allocation along the loader axles are obtained according to the operating conditions.

Theoretical researches have been carried out and the obtained mathematical expressions characterize a periodic cycle loader with a center pivot frame articulation as a moving mechanical system. The type and the nature of movement of the loader operating element have been considered. The design parameters and the operating modes affect crucially on the interaction between the bucket and the cargo. We have obtained the interdependence between the velocity and the digging depth of a bucket frontlift into the bulk cargo, as well as the kinetic energy of a bucket frontlift as a system, in its initial position. During the force analysis it has been determined the impact of the studied factors on the tractive power of the frontlift and the total digging force, which depends on the tangent tractive power, rolling resistance force and frictional sliding force of a frontlift.

The spectrum of construction, industrial, agricultural and other bulk load includes a lot of names that vary in their physical, mechanical and volume-mass characteristics. Continuous-action loaders are developed and constantly improved for bulk load shipping. Their main operating element, which is responsible for the efficiency and power consumption of the drive, is a feeder. The feeder separates or grabs the load from the surface on which the bulk load is stored. It is proposed to use a combination feeder consisting of two operating elements, that will allow to grab the load and transport it simultaneously. The kinematic analysis of the feeder operation and its interaction with the load has been carried out. We have derived the parametric equations of the blade motion when the loader is traveling and the shaft is rotating in the coordinate form. Relying on the length of the blade trajectory, it is presented the expression for the determination of the continuous-action loader with the combination feeder efficiency. The efficiency depends on the physical and mechanical properties of the load, operational and design specifications of the feeder.

In order to improve the working capacity and life of bearing units, the dimensional analysis of the inner geometry of a cylindrical radial bearing was carried out. The assembly component, composed by the outer diameter dimensions of the raceway of the inner race, the inner diameter of the outer race and the two diameters of the rollers, was considered as a dimension chain. It is recommended, in order to reduce wear and friction losses, to produce the diametrical dimensions of the roller according to the fifth accuracy degree. It is established that the cause of the axial clearance between the roller and the double-flanged race is the distance between the contact points on the right and left flanges with the horizontal position of the roller, as well as the diagonal distance. Tolerances for ring dimensions, for such a combination, are recommended to accept with respect to accuracy degree 6.

The article presents the assessment data that explain how the defects impact on the bearing capacity of radio tower pylons and stress and strain state of the pylons. The obtained results raise the possibility of replacing the equipment set on the radio towers with the additional equipment, including the one for solar radiation regeneration.