An agricultural harvester (10) includes a chassis (12) and a grain tank (28) carried by the chassis (12). The grain tank (28) includes a frame (70) having an opening (72) formed therethrough； a pair of tank cover sections (74, 76) movably associated with the frame (70) such that the tank cover sections (74, 76) can switch between an open position and a covering position relative to the opening (72) of the frame (70)； and at least one actuator (78) linked to at least one of the tank cover sections (74, 76) and configured to selectively provide a switching force. The agricultural harvester (10) is characterized by a force assistor (80) or a brake (120) linked to one of the tank cover sections (74, 76) and configured to apply an assist force or a braking force, respectively, to one of the tank cover sections (74, 76) but not the other tank cover section (76, 74).
