Hydrostatic drive unit of a vehicle

The vehicle (1) has a drive motor (4) and a hydrostatic drive unit, where one and another axle of vehicle (13) is coupled to the drive motor through the hydrostatic drive unit comprising a hydraulic circuit (10). The drive motor is coupled with hydraulic pumps (6,7), where each of the vehicle axles associated with hydraulic motors (11,24), is assigned to each of the hydraulic pumps. The hydraulic motor is detached- or coupled by a clutch (26), particularly a mechanical jaw clutch, which is operatively connected by the hydraulic motor of the vehicle axle.