In the scientific work we describe how ecological transmission-hydraulic fluid degrades during operation of agricultural and forestry machinery. We focused on investigating the physical-chemical properties of ecological transmission-hydraulic fluid. Measuring and sampling was performed under laboratory conditions, using a simulation device for testing transmission-hydraulic circuits in agricultural and forestry machinery.

The aim of the present article is the construction of a device for measuring and testing hydrostatic converters and subsequent verification measurement of the proposed device. This device will allow the measurement and testing of hydraulic pumps under laboratory conditions. In our case, we will test the hydraulic pump UD–25R, which is used in hydraulic drives of agricultural machines. Last but not least, the device described in the article can be used to test individual energy carriers used in hydraulic systems. The described device can simulate conditions that occur in operation. Using verification measurements we have proved that the designed laboratory equipment is suitable for testing hydraulic components and also allows monitoring and testing of the properties of individual hydraulic fluids. The measurement will result in a change in flow rate over time.