The harvester (1) has one-piece and multipiece attachment parts forming a cover that partially closes an opening (21), in a flat closed position. The attachment parts increase volume of a grain tank (3) in an erected filling position. Motion sequences are provided for moving or transitioning of the multipiece attachment parts from the closed position into the filling position and vice versa in a folding plane. The motion sequences for the one-piece attachment parts are decoupled so that the multipiece attachment parts overlap in sections in the closed position.
