Abstract: A method and apparatus for a centrifugal pump according to which an annular retainer is positioned around a first end portion of a pump shaft, an open end portion of a compression cylinder is positioned around the first end portion of the pump shaft so that the pump shaft extends within an internal cavity of the compression cylinder, the compression cylinder is moved towards an annular groove formed in the first end portion of the pump shaft, and the annular retainer is sprung into the annular groove. In some embodiments, springing the annular retainer into the annular groove constrains one or more impellers and one or more annular spacers between the annular retainer and another annular retainer connected to the pump shaft.

Abstract: A method and apparatus for a centrifugal pump according to which an annular retainer is positioned around a first end portion of a pump shaft, an open end portion of a compression cylinder is positioned around the first end portion of the pump shaft so that the pump shaft extends within an internal cavity of the compression cylinder, the compression cylinder is moved towards an annular groove formed in the first end portion of the pump shaft, and the annular retainer is sprung into the annular groove. In some embodiments, springing the annular retainer into the annular groove constrains one or more impellers and one or more annular spacers between the annular retainer and another annular retainer connected to the pump shaft.

Abstract: A hydraulically operated planetary transmission and motor assembly mounted on the hub of two or more wheels of a four wheeled vehicle for providing wheel driving torque with the transmission set in drive. In an alternate form, the transmission and motor assembly is mounted on the hub of a winch to provide the power drive. The transmission is hydraulically engageable and disengageable and includes a lock whereby the transmission can be locked in either the engaged or disengaged position. The arrangement of components provides easy access for maintenance and for change out of gears to gear sets having different gear ratios all within the same transmission housing.