The gear (2) has a center rod (8) extended between a center rod receiving slot (9) of a tractor (1) and a center rod receiving region (10) formed at a tool (3). The center rod comprises an abutment element (12) that is provided at a connection head (13) of the center rod, where the connection head faces the tractor. The abutment element is lockable together with the connection head in the receiving slot. The abutment element is movable relative to the connection head. The abutment element and the connection head form a pre-assembled unit.
