Forage harvester with a conditioning unit movable between an operating position and a non-operating position

A self-propelled forage harvester having a frame, a chopping drum, an accelerator arranged downstream of the chopping drum, and a channel between the chopping drum and the accelerator, the channel having a section in which one of a conditioning unit and a hollow shell can be selectively inserted, wherein the conditioning unit and the hollow shell are jointly supported on a pivot arm pivotable by means of a displacement drive about a first pivot axis running horizontally and transverse to the forward direction, which arm is movable between an operating position of the conditioning unit, in which the conditioning unit is in the section, and a non-operating position of the conditioning unit, in which the shell is in the section, wherein the conditioning unit is mounted on the pivot arm rotatably about a second axis parallel to the first pivot axis and wherein the conditioning unit cooperates with the frame by means of a positive guide, which has the effect that the conditioning unit rotates about the second axis in the same direction as the pivot arm rotates around the first pivot axis.