I have heard that you can over grease a bearing. Anyway, I bought these 1200 pound capacity casters (4" dia x 2" wide steel wheels) for the back of my motorhome where it sometimes drags tail on driveways. I mounted them yesterday and then greased them. They still made some metallic noise so I added more grease until they got quiet. But now they don't spin as freely. I think I put too much grease--way too much. But I am thinking it doesn't matter because they do turn fairly easily and are only going to be used on occasion, not continually. What do you think?