I think that you will find that this disassembly is specific to each boat's design, so no generic postulations will apply.
The bearings can be of different types: simple sleeve bearings usually made of some slippery plastic or perhaps scintered bronze ("Oilite"), and on to elaborate ball or needle bearings. I think that Harken
manufactures some of the latter...
At any rate, the main issue will be to determine if they have worn to the point where there is too much slop in them. A simple shake test, in or out of the water
, should give you an idea about this. But, catastrophic bearing failure is unlikely, so don't put too much worry into this one.
The larger issue is the shaft and the webbing inside the rudder blade. These are often made of stainless, and there are many reports of catastrophic failure in these items. There have been several threads on CF in the past few months relating to such things, and the bottom line is that there isn't any easy way to determine the internal condition of the rudder. The marque's known history
of "no failures" is encouraging, tho'.
Good luck with your preparations, and good sailing
Jim and Ann s/v Insatiable II lying Cairns, Qld Oz