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.

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.

The axle load acts on the box unit and has shock-pulse nature when the car is moving, that can lead to a mutual change in the surface positions of the roller ends with the edges of the bearing races. The ways are proposed to optimize the internal geometry of the radial and end contact elements of the roller bearing of the axle box unit. It is proposed to eliminate the occurrence of possible conditions that lead to the movement of bearing rollers into the thrust and locking of bearing rollers by increasing the minimum limit in the axle clearance of the axle box.