Abstract: A bearing and seal assembly for use in a hydraulic pump has a housing with a stepped outer diameter. The smaller diameter encloses a roller bearing and is adapted to sealingly seat in the pump housing. The larger diameter is disposed within the pump housing and encloses a seal member adapted to sealingly contact a stationary internal pump component so as to cooperate therewith in sealing against leakage of high pressure fluid from the pump. A shoulder between the stepped diameters abuts a radial inner wall of the pump housing. The high pressure fluid within the pump acts on the seal end of the assembly thereby urging the shoulder to remain in abutment and assist in sealing against fluid leakage.