Oscillation actuator is used in places where it is necessary to perform an alternating motion with fixed amplitude corresponding to the stroke of the cylinder. The movement of the piston rod of the cylinder can be continuously, without stopping, from one end position of the piston rod cylinder or a delay (break) in one of two positions. Since the ultimate micro switches are not used for reversing of the direction, it is possible that it integrates in a very dirty and wet environments. The cylinder is the furthest from the damping of strokes and the hydro units have hydraulic accumulators, so the system itself is soft and quiet, without the shock. The actuator works synchronously with the starting working machines. On customer's request the actuator can have other technical characteristics.