A system is able to handle oscillations –– i.e. oscillations may occur –– if a periodic exchange of energy takes place between two energy stores (spring-mass system, e.g. a hydrostatic transmission, in which the rotating mass acts as an inductive accumulator and the oil pillar as a capacitive accumulator (spring)).
In hydraulic systems, however, oscillations also occur, for example if a hydraulic capacity is controlled by an integral control element in the pressure control circuit, as is the case for a pressure-regulated pump.