Quotes because I don't know enough to say that these bearings are truly sealed... but they have the rubbery rings around them.
viz:
These are a couple of PTO quick-release adapters that had finally gotten so nasty that they were neither quick nor releasing.
So I disassembled them, let them soak in degreaser for a couple days, and went at them with a toothbrush.
Surprise, surprise.... I found that they each have a (pressed-in?...I can't make it budge) bearing whose lube the degreaser probably made history.
So I need to re-lube those bad boyz.
My kneejerk reaction is to take a razor blade or some other thin tool and gently pry the black rings off... then clean the balls, re-pack with grease, and then hope the black rings go back into place and stay there.
I know this isn't rocket science.... but these things take quite a beating and I'd rather not mess up the "sealed" aspect and have them fail prematurely.
Methodology? Are they really "Sealed"?