This paper analyses the key aspects of the operation of geroler hydraulic motors, widely used rotary hydraulic motors. The focus is on understanding their performance, efficiency and durability in different working conditions. The work includes a theoretical analysis of the principles of work, supported by modelling. Furthermore, experimental tests conducted to characterize the motors in terms of torque, speed, flow and efficiency are considered. Special attention is paid to the analysis of factors that influence the wear of internal components. The results of the analysis provide deeper insight into the behaviour of geroler hydraulic motors, identify areas for potential improvements in design and application and for optimizing their operation and extending their service life in various industrial and mobile applications. In conclusion, the work contributes to a better understanding of hydraulic motors, which is crucial for engineers and technicians involved in the design, application and maintenance of hydraulic systems.

This paper presents a procedure for probabilistic analysis of joint load carrying capacity as a randomly variable quantity on the example of a cylindrical press fit joint of a bronze ring with teeth and a worm gear hub. By fitting the set of results obtained by a series of FEM simulations for characteristic values of input parameters (interference and material characteristics), the coefficients of a second-order multidimensional polynomial as a "response surface" for the output quantity - joint load carrying capacity were determined. By MC simulation, generating random parameters according to the known laws of statistical distributions and evaluating the previously obtained higher-order polynomial, a statistical set was obtained, the processing of which determines the distribution parameters of the randomly variable output quantity. The described procedure is applicable to a wide class of probabilistic design problems that are analyzed using FEM analysis.

Paint production and for that colour mixing is an important process which has wide applications in several field. There are various kinds of colour mixing that can be done. It can either be additive colour mixing or subtractive colour mixing. Generally, there are various kinds of paint mixing machines available in the market. They vary in their size, shape, technology and methodologies. The aim of this paper is to present a calculation and analyse of hydraulic system for paint mixing machine. The paint mixing machine has the task of mixing the oil paint components in vessel until the finished mass is obtained. As oil paint is a typical representative of rheological materials where the viscosity depends on the shear rate, it is necessary to mix different paint structures during processing at different speeds - the number of revolutions of the propeller must be changes.