Abstract: A method for converting a locomotive traction motor originally equipped with sleeve bearings to roller bearings is provided. The ensuing method includes removing all parts of the original motor leaving only the motor frame. Recesses are then machined in the motor frame at both the pinion end and commutator end. The recesses are sized accordingly, to receive the roller bearings, which have a larger diameter then the sleeve bearings. Upper and lower frame inserts, each having an additional mounting opening, are then mounted to the machined frame to increase the strength and stiffness around the machined regions. A replacement axle is then equipped with the roller bearings, a pair of labyrinth seals, a gear and a pair of wheels. A pair of bearing housings may then be placed over the roller bearings. Each bearing housings has a reservoir that when the traction motor is assembled, is in communication with the roller bearings.