(slightly off topic - this is about a modern raker/scarifier)
A couple of years ago I attempted to use my Al-Ko scarifier to get the moss out of my lawn. The engine seemed to be labouring a bit, but since the grass at the edge (where I started) was a little long, I kept going. Then the smoke started coming out, so I stopped. As you do. It turned out...
... that the bearing fixed to the end of the scarifier drum had seized since last use, and the 1000W motor was simply turning the entire bearing within the plastic mounting, which promptly melted and sealed itself shut. The manual (I post-checked) makes no mention of checking or lubricating this bearing.
I have now found that I can get the mount point apart (brutality, knives, saws and mole grips were involved), and that the mount point is in fact a replaceable sub-assembly, available as a spare part (which may raise suspicions as to its design life). I also cleaned up the old seized bearing, so I could read its model number; turns out to be 6001-zz.
I have replaced the seized bearing with a lovely new bearing, and bolted it in place, and used the specified-in-the-manual theadlock.
Now to my actual question: in a once bitten, twice shy, kind of way, I intend to check that this bearing turns OK before each use (I don't scarify very often, so this is not a major issue). But is there any kind of maintainance/lubrication I can perform on a shielded bearing ?