A sweep assembly rotatable along a sweep path in a bin and comprising a housing, a particulate sweep assembly to move particulate matter, and a sweep drive assembly to move the sweep assembly across the floor surface. At least one support assembly may have a support condition characterized by the support assembly providing support to the housing of the sweep assembly and a non-support condition characterized by the support assembly not providing support to the housing. The support assembly may change from the support condition to the non-support condition by movement of the sweep assembly along the sweep path. In some embodiments, the support assembly may comprise a sweep-mounted component moving with the sweep assembly along the sweep path and a floor-mounted component being stationary with respect to movement of the sweep assembly along the sweep path.