An actuating unit (50) for a sorting device (10), the actuating unit (50) comprising a flap holder (60) and at least one flap (80, 80′) having a drive component (81, 81′) for transmitting a drive force to a drive wheel (32) of a transport unit (18), the flap (80, 80′) being displaceably mounted in the flap holder (60) between a resting position and a drive position, a movement limiting component (82) being provided on the flap (80, 80′), said movement limiting component cooperating with a movement limiting element (63), such that the displacement movement of the flap (80, 80′) is limited in the direction of the resting position and/or in the direction of the drive position. Sorting device (10) having such an actuating unit (50) and method for mounting such an actuating unit (50).