The rake machine plays an important role in forage harvesting, especially haymaking. This written work is about a universal mobile hydraulic device, which is primarily suitable for steep slopes, but can also be used for work on plain fields. In the final thesis we design the construction solution for the grass raking using a hydraulic system, integrated into an existing mobile construction of a single-axle tractor designed for working on steep slopes. With the help of 3D modelling software, the model for a prototype was created. For the dimensioning of the hydraulic device measurements were made on an existing hydraulic axial piston pump. The hydraulic parameters were calculated. The prototype was manufactured and tested in operation. Selected hydraulic components are presented, these are actuators, directional and flow control valves. Finally, the results are presented after the completion of the first tests. Data about the rake machine is also presented along with a comparison to competing machines.
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