I have not worked on this particular electric motor, but I have replaced bearings on a furnace fan motor. The furnace motor had bronze sleeve type bearings. A replacement was found at a local hardware store that had a large selection of fasteners, etc in sliding trays. The standard size sleeve bearing that was available matched the ID and OD of the motor bearing, but was longer, so I had to cut it to match the length. Then carefully press out the old bearing and press in the new one, and lubricate with sae 20 machine oil periodically.