A final drive system includes a spindle, an axle shaft, a planetary gear assembly, and a bearing assembly. The bearing assembly includes a bearing retainer plate and a shaft seal assembly. The shaft seal assembly seals the axle shaft with the bearing retainer plate. The shaft seal assembly includes a first side, second side, a housing member, bearing members, a sleeve member, and seal member. The housing member is removably attached and coaxially disposed to the bearing retainer plate. The bearing members are coaxially attached to the housing member. The sleeve member is coaxially attached to the bearing member and is removably attached to the axle shaft. The seal member is disposed between the sleeve member and the housing member proximal to the first side. The removable attachment of the housing member facilitates removal of the shaft seal assembly and access to the seal member through the first side.