To make operating a hydraulic drive mechanism above its admissible maximum rotational speed without separating the mechanical connection to the drive wheel possible, the motor (1) is adjusted in displacement to almost no displacement and the pressure-medium supply line (2) and the pressure-medium return line (3) operate a hydraulic drive with at least a hydrostatic radial piston motor (7, 9) exclusively with the supply pressure (20) connected.

 
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> Hub motor formed in a wheel

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