SILO UNLOADER

A leveling device for the wheel-driven frame of a silo unloader which encloses means for transporting ensilage over which it travels, the inner end of which is supported at about the silo center and the outer end of which is rotatable thereabout near the silo wall, comprising means for raising or lowering said outer end depending upon the angle the frame makes with the wall of the silo, said means comprising a wall-engaging wheel, a first arm on which said wheel is mounted to position it at a selected location above the frame, a shaft pivoted in said frame and to which said arm is rigidly connected, a second arm rigidly connected to said shaft, generally parallel to the frame and shorter than the first arm, a bar extending through a slot in and at approximately right angles to the frame to move up and down therein, means pivotally connecting the free end of said second arm to said bar, and means connecting the ends of said bar to the respective unloader driving wheels, so that as the wall wheel moves up or down along said wall it simultaneously effects lowering or raising of the frame outer end with respect to said driving wheels.