Shift device of a power take-off transmission

A shift device of a power take-off (PTO) transmission of an agricultural utility vehicle, in particular a tractor, comprising an input shaft driven by an engine of the utility vehicle, and an output shaft, the input shaft being connectable to the output shaft by way of first, second and third gear pairs, in order to transmit torque from the input shaft to the output shaft via one of the three gear pairs, three gear wheels of the gear pairs being assigned to the input shaft, three gear wheels of the gear pairs being assigned to the output shaft, one gear wheel of a gear pair being rotationally fixed to one of the input shaft or the output shaft and the other gear wheel of the gear pair being rotationally fixable to one of the output shaft or the input shaft by a gearshift sleeve, the two gear wheels of a gear pair intermeshing with one another, the output shaft having a recess, in which a PTO stub shaft is reversibly introduced, a carrier component on which the gear wheels, embodied in the form of loose gears, of the second and third gear pair, are rotatably supported and wherein the carrier component can be rotationally fixed to one of the output shaft and the input shaft, a mechanism, actuated by a PTO stub shaft and which serves to actuate a gearshift sleeve, provided on the output shaft and rotationally fixed to the output shaft, being provided on the output shaft, the gearshift sleeve in one shift position of the gearshift sleeve being rotationally fixed to a gear wheel of a first gear pair, wherein in another shift position of the gearshift sleeve no rotationally fixed connection exists between the gearshift sleeve and gear wheel of the first gear pair and wherein by means of a further gearshift sleeve a rotationally fixed connection is established with one of a gear wheel of the second gear pair or with a gear wheel of the third gear.