grain tanks of harvesting machines frequently have an irregularly shaped interior which is difficult to fill completely and to unload . a conveyor system is proposed facilitating loading and unloading of the grain tank . the conveyor system comprises a conveyor arrangement which contains conveyor elements that can be driven and that can be moved vertically depending on the height of the crop deposit . the conveyor arrangement is mounted to the interior wall of the grain tank by a four bar linkage . during the filling process , the conveyor elements act as distributors filling in unused areas of the grain tanks . during the unloading process , they act as conveyors directing grain to the unloading auger .