Hydraulic device (10, 100) with radial pistons comprising: - a shaft (12, 112) arranged along an axis (11, 111); - a cover (13, 113) forming a casing element, the cover and the shaft being free to rotate with respect to one another; - a distribution assembly comprising: - a multi-lobe cam (14, 114); - a cylinder block (15, 115) radially facing the cam (14, 114), said cylinder block comprising a plurality of cylinders (17, 117) wherein are arranged pistons guided so as to slide radially in the respective cylinders of the cylinder block and bearing on the lobes of the cam; - a distributor (16, 116) configured to exert a thrust force against the cylinder block (15, 115) along the axis (11, 111) of the shaft so as to successively apply a fluid under pressure to said pistons; - a first mechanical bearing (21; 121a, 121b) mounted in radial contact between the cover (13, 113) and the shaft (12, 112), and - a set (22, 122) of second mechanical bearings comprising at least one second mechanical bearing (22a; 22b; 22c, 22d; 22e; 122a; 122b, 122c) mounted in radial contact between the cover (13, 113) and the shaft (12, 112), said set (22, 122) of second mechanical bearings being configured to take up the thrust force exerted by the distributor (16, 116); wherein the first mechanical bearing is a radial contact ball bearing and characterized in that the first mechanical bearing and the set of second mechanical bearings are arranged on either side of the distribution assembly. - a shaft (12, 112) arranged along an axis (11, 111); - a cover (13, 113) forming a casing element, the cover and the shaft being free to rotate with respect to one another; - a distribution assembly comprising: - a multi-lobe cam (14, 114); - a cylinder block (15, 115) radially facing the cam (14, 114), said cylinder block comprising a plurality of cylinders (17, 117) wherein are arranged pistons guided so as to slide radially in the respective cylinders of the cylinder block and bearing on the lobes of the cam; - a distributor (16, 116) configured to exert a thrust force against the cylinder block (15, 115) along the axis (11, 111) of the shaft so as to successively apply a fluid under pressure to said pistons; - a multi-lobe cam (14, 114); - a cylinder block (15, 115) radially facing the cam (14, 114), said cylinder block comprising a plurality of cylinders (17, 117) wherein are arranged pistons guided so as to slide radially in the respective cylinders of the cylinder block and bearing on the lobes of the cam; - a distributor (16, 116) configured to exert a thrust force against the cylinder block (15, 115) along the axis (11, 111) of the shaft so as to successively apply a fluid under pressure to said pistons; - a first mechanical bearing (21; 121a, 121b) mounted in radial contact between the cover (13, 113) and the shaft (12, 112), and - a set (22, 122) of second mechanical bearings comprising at least one second mechanical bearing (22a; 22b; 22c, 22d; 22e; 122a; 122b, 122c) mounted in radial contact between the cover (13, 113) and the shaft (12, 112), said set (22, 122) of second mechanical bearings being configured to take up the thrust force exerted by the distributor (16, 116);