The majority of old motors which are greased with grease zerks are likely to be found with windings caked with old grease because people just pumped grease in over the years without removing purge plugs prior.... The proper procedure is: Remove purge plug, pump grease into the bearing until you see the grease from your gun emerge from the purge plug..Run motor one minute with purge plug removed..Stop motor.. Wipe excess grease from purge plug hole... Install purge plug.. DO NOT ADD MORE GREASE...Use this procedure once a year and your motors will thank you for it.. Many motors have been ruined by grease entering the windings causing temperature rise and failed insulation.. Cheers from Louisiana; Ramsay 1