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The ?20-20-20? program provides a 20% reduction in greenhouse gas emissions (CO2 equivalent) compared to 1990, ie a 20% reduction of the final energy consumption compared to 2005, by increasing of the energy efficiency and increasing the share of renewable sources in the total energy mix to at least 20% until 2020. Starting from this European directive, the authors propose to develop a method of assessing the wear and operating status of hydraulic pumps, rotary hydraulic motors and hydraulic cylinders, without nec...