Abstract: A drive mechanism suitable for vertical pumps driven by hollow shaft motors includes an output shaft, a variable speed transmission unit for mounting above the motor, and means for vertically adjusting the position of the output shaft, the adjusting means being located above the transmission unit.

Abstract: An improved stuffing box can effect an auxilliary static seal with a moveable shaft to allow replacement of packing elements. The stuffing box includes a sealing ring concentrically disposed around the shaft and means for mounting the sealing ring radially spaced apart from the shaft to permit lubricating fluid to flow between the sealing ring and the shaft during movement of the shaft. The stuffing box also includes a seal container axially moveable along the shaft for pressing the sealing ring radially against the shaft to form the static seal.