A discharge system for a grain storage bin has a discharge augerextending from the center of the bin floor to an exterior location and a sweepaugerpivotally supported at an inner end on a post at the center and extendingacross thefloor to the periphery of the bin for sweeping movement over the floor. Thesweepauger is carried on a pivot link arm which pivots at one end on the post andat theother end on the sweep auger to allow it to move from a first position alongone sideof the discharge auger to a second position along the other side. The sweepaugeris driven by a wheel at the outer end carried on a plate attached to an endplate ofthe shroud of the sweep auger and extending parallel thereto to a locationbehindthe shroud at which is located the hydraulic motor directly driving the wheelwith themotor shaft parallel to the auger shaft and behind the shroud. An extra weightplatecan be slid into a receptacle on the mounting plate.
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