Power take-off connecting device to connect a power take-off drive of a vehicle to a power take-off drive of a mounted implement, wherein a power take-off connecting arrangement on the vehicle and therefore a releasable, frictionally attachable power take-off connecting arrangement on the mounted implement are present, wherein mechanical coupling elements are provided on the vehicle and mechanical mating coupling elements corresponding to them are provided on a mounted implement which can be pushed into each other and can be locked together, wherein the power take-off connecting arrangement on the vehicle and the power take-off connecting arrangement on the mounted implement, each attached axially on the vehicle or on the mounted implement, or on the coupling arrangement on the vehicle and the coupling arrangement on the mounted implement, are arranged such that, during the mechanical attachment of the vehicle and the mounted implement, the power take-off connecting arrangements are permanently coupled together, characterised in that the power take-off connecting arrangement on the vehicle comprises a coupling shaft, a bearing shaft connected to it and a connecting shaft wherein the bearing shaft is housed and supported in a bearing seat by means of a bearing arrangement, wherein the bearing shaft is connected to the bowl-shaped designed coupling shaft, wherein the coupling shaft 153 is secured and connected axially by a central screw connection 175 with the connecting end 165 of the bearing shaft 154 and the coupling shaft forms a connection or coupling with a bowl-shaped coupling hub of the power take-off connecting arrangement of a mounted implement on the mounted implement, wherein the coupling hub is established axially in a corresponding bearing seat in a docking slot of the mounted implement and, on the end nearest the coupling of the coupling shaft, has a corresponding set of external teeth to connect the coupling shaft with the internal teeth of the coupling hub, wherein the coupling hub has, on its connecting or coupling end, a bowl-shaped receptacle with internal teeth to mesh with the external teeth of the coupling shaft, wherein these teeth are designed correspondingly. the power take-off connecting arrangement on the vehicle and the power take-off connecting arrangement on the mounted implement, each attached axially on the vehicle or on the mounted implement, or on the coupling arrangement on the vehicle and the coupling arrangement on the mounted implement, are arranged such that, during the mechanical attachment of the vehicle and the mounted implement, the power take-off connecting arrangements are permanently coupled together, characterised in that the power take-off connecting arrangement on the vehicle comprises a coupling shaft, a bearing shaft connected to it and a connecting shaft wherein the bearing shaft is housed and supported in a bearing seat by means of a bearing arrangement, wherein the bearing shaft is connected to the bowl-shaped designed coupling shaft, wherein the coupling shaft 153 is secured and connected axially by a central screw connection 175 with the connecting end 165 of the bearing shaft 154 and the coupling shaft forms a connection or coupling with a bowl-shaped coupling hub of the power take-off connecting arrangement of a mounted implement on the mounted implement, wherein the coupling hub is established axially in a corresponding bearing seat in a docking slot of the mounted implement and, on the end nearest the coupling of the coupling shaft, has a corresponding set of external teeth to connect the coupling shaft with the internal teeth of the coupling hub, wherein the coupling hub has, on its connecting or coupling end, a bowl-shaped receptacle with internal teeth to mesh with the external teeth of the coupling shaft, wherein these teeth are designed correspondingly.