Hydraulic is used in many areas and standards are rising. Today's state of the art of what exists and what is employed to reduce the noise. For noise reduction using the latest pump , hoses , hydraulic valves with low noise production , linear dampers , etc.. In the second part are measurement procedures and presents the results of rehabilitation. We can reduce noise of the sound source imply and for the affordably price. Absorbing foam is better than rubber insulation but what we use is a matter of compromise.