That's the problem ,, too much grease , amazing ,you try to grease them up thinking your doing the right thing . must have just stopped the rollers turning properly and I presume they were just rubbing ,, friction causing heat .. Of course this being the bottom roller bearing on a vertical shaft, has to be preloaded right to get those bottom bearings running , don't think so much of a problem on my lathe bearings ….anyway thanks All that helped me
Mike