Abstract: The adjustment assembly of a hydraulic steering system of a vehicle is provided. The adjustment assembly can be positioned between the steering column and the hydraulic steering unit of the system, to adjust the mutual angular position between the rotation angle of the steering column (?) and the effective steering angle at the wheels (?). The adjustment assembly includes an adjustment device including an electric motor and an electronic command unit controlling its actuation; an epicycloidal device including a satellite-carrying member operatively connected to the steering column; at least one satellite gear supported and guided in rotation by the satellite-carrying member; a first solar gear operatively connected to the hydraulic steering unit and to the at least one satellite gear; and a second solar gear operatively connected to the adjustment device and to the first solar gear to control the angular position and/or the rotation of the first solar gear.

Abstract: A wheel carrier assembly (10) of a machine for agricultural use, such as a tractor, has a drive axle (2) and steering wheels. The wheel carrier assembly (10) includes a constant-velocity joint (100) for the connection, upstream, of the wheel carrier assembly (10) to the transmission. The assembly includes, downstream, a rotation shaft (101) for the rotation of the wheel assembly. A disc brake device (200) controls the braking of the wheel assembly. A gear reducer (300), connects to the wheel assembly and to the rotation shaft (101). The disc brake device (200) is operationally connected to the rotation shaft (101) so that the braking action is applied directly on the rotation shaft, upstream of the gear reducer (300).