Combine harvester

A combine harvester (1) comprising

• a grain tank (3) having an upper opening (21);
• and
• a foldable attachment (2) disposed on the upper opening (21), the foldable attachment comprising two opposing, one-piece, flat attachment parts (23a, 23b) and two opposing, multiple-component, flat attachment parts (24a, 24b),
• wherein the attachment parts (23a, 23b, 24a, 24b) are swivellably disposed on the upper edge of the upper opening (21) of the grain tank (3), are swivellably connected to one another and in lying-flat, closed positions, form a cover that at least partially closes the opening (21), and in erected filling positions, increase the volume of the grain tank (3);
• and
• wherein motion sequences for moving or transitioning the multiple-component attachment parts (24a, 24b) from the closed positions into the filling positions, and vice versa, are decoupled from corresponding motion sequences for the one-piece attachment parts (23a, 23b), via an additional folding plane on one of the multiple-part attachment parts (24a, 24b) arranged so that the multiple-component attachment parts (24a, 24b) overlap in sections in the closed position.