a ball 14 at the front end of the piston 6 this ball 14 forming a part of a ball joint the cylinder drum 3 is supported in the housing 2 on a bearing surface 15 made of peek that is the bearing surface 15 forms a radial bearing at the end facing away from the swashplate 10 is provided a pressure plate 16 into which sleeves 17 are inserted which form a connection between the pressure plate 16 and the cylinders 4 the pressure plate 16 bears on a control plate 18 which is provided with a cover 19 made of peek the control plate 18 is arranged to be fixed in the housing 2 here a bolt 20 retains it the pressure plate 16 rotates together with the cylinder drum 3 in relation to the control plate 18 so that the control plate 18 can position the inlet and outlet of hydraulic fluid for the cylinder 4 correctly the pressure plate 16 is pressed against the control plate 18 by the force of a spring 21 the sleeves 17 permit a slight axial movement of the cylinder drum 3 in relation to the pressure plate 16 at the same time the spring 21 provides a certain pressure with which the holddown plate 9 presses.