Kent-Moore Tools
Kent-Moore J-36135 Universal Cup Installer

This tool is adjustable and designed for installing bearing cups from 3-5/8" to 6-12/2" OD of tractor/trailer wheels from 11, 000 to 50, 000 lb capacity. Adjust and lock the jaws to the cup ID, slip on the new cup, put it all in place and hit the handle with a hammer. No more worrying about damaging the bearing because the cup was improperly installed.