I recently refurbished my 20 year old US Tower TX-472 and TRX-80HD raising
fixture.
In examination of the sealed bearings used on both tower and raising fixture, I
found several that were binding - badly. This occurred without load.
I soaked them in household vinegar for a few days, and the bearings were back
to "freewheeling". I neutralized the acid with water, and stored them in
kerosene before reinstalling.
I suspect there was a small amount of rust inside the bearings that was
converted to water soluble form with the vinegar (acetic acid).
Hope this helps someone, as a check with UST reveals replacements are very
expensive ($100+)
I did give them a shot with PreLube 6 along with the cables, and all seems well
at this time.
Kim
K4ATX
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