1. A coupling hook for the lower link of an agricultural tractor, the coupling hook (1) having a hook body (3) with at least one receiving element (4) for the coupling body (2) and at least one receiving chamber ( 5), in which at least one retainer (6) is held, which is arranged to interchange between the locking position locking and locking the coupling body (2) and the release position pulled into the receiving chamber (5) so that the coupling body ( 2) can be removed from the receiving element (4), and the coupling body (2) p When pressed into the receiving element (4), the latch (6) can be moved to the activation position, so that the latch (6) then automatically switches to the fixation position, characterized in that the latch (6) is in active connection with at least one with a cam (9) of at least one locking lever (10) movable, wherein the cam locks the lock (6) in its locked position, so that it resists emanating from the engaged coupling body (2) and acts on the lock (6) ) effort and can, with one st hand, by directed towards the receiving element (4) force and, on the other hand, by adjusting the locking lever (10) is transferred to a position osvobozhdeniya.2. The coupling hook according to claim 1, characterized in that the latch (6) is configured to swap limitedly in the direction of the receiving element (4), and the latch (6) in the clutch position rearranged to the receiving element (4) is pressed into the release position .3. Coupling hook according to claim 1 or 2, characterized in that the locking lever (10) and / or the lock (6) is pre1. Сцепной крюк для нижней тяги сельскохозяйственного трактора, причем сцепной крюк (1) имеет тело (3) крюка с, по меньшей мере, одним приемным элементом (4) для сцепного тела (2) и, по меньшей мере, одну приемную камеру (5), в которой удерживается, по меньшей мере, один фиксатор (6), который выполнен с возможностью перестановки между обхватывающим и блокирующим сцепное тело (2) положением фиксации и положением осв
