Numerical software is indispensable in calculating effects of various parameters on the operation of a hydraulic device. The thesis presents the operation and use of the Easy5 software package. Included are the defining of the components, connections among them, as well as simulation settings. A hydraulic system that was used to measure values is presented. The numeric model is compared with a simple hydraulic system. The results are presented and commented on. The results of the research were expected, because with the numeric model cannot provide equal values to the measured ones.