Originally Posted by
philbob57
I always thought sealed bearings required no maintenance.
SEALED bearings means just that. The internals of the bearings are closed off from the rest of the world by some mechanical means. A precision fit washer, a rubber gasket, a scraper ring, a dust shield...
All bearings where you can't see into the balls are sealed bearings.
You're thinking about CARTRIDGE bearings.
These are normally not serviced, but simply replaced when they run rough or develop play.
If you are stubborn enough, cartridge bearings with removeable shields can be cleaned and relubed, but not adjusted for play.