This paper deals with creation of methodology that can be effectively used in design and development of a more complex hydrostatic system. In future, the designed hydraulic system should fulfill given functions respecting the given parameters. It is usually possible to create such a system using several methods but not all of them lead to a full success without a risk of failure. It is not possible to create clear-cut directions for reliable option of design methodology but in dependence on the type of solved problem and demands on the results, a suitable choice of methodology can be shown e. g. by means of an example of verified and successful process of system designing. Using the concrete example, the paper shows a methodology of successful development of a hydraulic system where demanding research claims had to be fulfilled. To carry out this research, it was necessary to use a special experimental stand and computer modeling to gain the optimum effectiveness.