meshes both with the loose wheel 5 and also with the loose wheel 21 by means of the clutch 9 for a forward gear the loose wheel 21 can be connected to the fixed wheel 22 and the fixed wheel 23 whereas the fixed wheel 22 and the fixed wheel 23 are connected to the shaft 24 and the loose wheel 21 is mounted to rotate on the shaft 24 the fixed wheel 23 meshes with the fixed wheel 25 which is arranged in a rotationally fixed manner on the shaft 26 mounted to rotate on the shaft 26 is the loose wheel 28 which can be connected by means of the first gear clutch 27 to the fixed wheel 25 the loose wheel 28 meshes with the fixed wheel 29 which is connected in a rotationally fixed manner to the shaft 30 on which the loose wheel 32 is mounted to rotate by means of the third gear clutch 31 the fixed wheel 29 can be connected to the loose wheel 32 the loose wheel 32 meshes with the fixed wheel 18 which is connected in a rotationally fixed manner to the shaft 33 and can be connected by means of the second gear clutch 34 to the loose.