Abstract: A hub adapted to support an electromagnetic clutch and a hydraulic pump thereon is disclosed. The hub is generally hollow and cylindrical in shape, including a first annular mounting portion having an inner cylindrical mounting surface. The inner cylindrical mounting surface is sized to receive and precisely position therein a cylindrical flange of the hydraulic pump. The hub also includes an enlarged cylindrical flange portion disposed adjacent to the first mounting portion. A plurality of apertures are formed through the flange portion for securing it to an external mounting bracket. The hub further includes a second annular mounting portion having an outer cylindrical mounting surface. The outer cylindrical mounting surface is sized to receive and precisely position thereon a bearing assembly of the electromagnetic clutch. Thus, the hub provides precise co-axial mounting surfaces for both the hydraulic pump and the electromagnetic clutch.