The invention is directed to a crop tank system with a crop tank (3) for receiving harvested crop (C) and with a fill level sensor arrangement (4) for detecting fill level information regarding the crop tank (3). It is proposed, that the fill level sensor arrangement (4) comprises a radar sensor (5), which is sending out and receiving radar rays (6,7), which radar rays (6,7), depending on the fill level (8) of the crop (C) contained in the crop tank (3), are penetrating the crop (C) contained in the crop tank (3) and/or are reflected by the crop (C) contained in the crop tank (3) and that the fill level sensor arrangement (4) comprises an electronic sensor control (9) which determines the fill level information based on the received radar rays (7).
