A grain cake breaker device is provided for placement within a storage bin to facilitate the removal of grain therefrom. The device includes a support structure having a number of legs which are connected to the storage bin floor at their lower ends. The legs converge together at their upper ends where they are joined with a hydraulic cylinder. The hydraulic cylinder is connected to a shaft which extends downwardly toward the bottom of the storage bin. A plurality of nonrotatable, rigid cutting arms extend outwardly and upwardly from the shaft. When the hydraulic cylinder is powered, the shaft moves in a substantially vertical reciprocal direction so that the cutting arms loosen caked grain when contacted by the cutting arms. The grain then flows to the bottom of the storage bin where it is carried from the storage bin by a conveyor.