Abstract: A cartridge type assembly is provided for use in conjunction with a housing wall having an opening thereof through which a rotary shaft projects. The assembly includes an inner bearing race supporting sleeve which is axially removably slidable, sealed relative to and releasably anchored in axial position on the shaft. A floating annular outer bearing race supporting housing is disposed about the sleeve and bearing structure including inner and outer races is stationarily supported from the sleeve and housing, respectively against axial and angular displacement relative thereto. The sleeve includes first rotary axial face seal ring structure removably stationarily supported therefrom in sealed engagement therewith and the housing includes second stationary axial face seal ring structure removably stationarily supported therefrom and with which the first rotary axial face seal ring structure is rotatably slidably engaged.