A dynamoelectric machine mounting assembly characterized by having a vertically movable wedge bar that is slidably mounted between one end of a dynamoelectric machine pedestal and a beveled cam block that is welded in a fixed position on a metal foundation soleplate that supports the machine. The wedge bar is driven downward against the beveled cam surface by a plurality of bolts inserted through the wedge bar and threaded into the soleplate. Such downward movement of the wedge bar compresses it between the cam block and the machine pedestal to stress-load the wedge bar and rigidly fix the machine in position on the soleplate so that the machine does not move in an axial direction when thrust loads are applied to it along its drive shaft axis.