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FYI: I recently had a problem on one of my towers that seemed
like the rotor was failing and did not want to turn fully. After
some heavy winds up here I suspected rotor damage. It turned out
( no pun intended) that at the top of the US Tower crankups there
is a 6 inch sleeve that the mast goes through. In the sleeve
there are 2 square headed bolts that are used to lock down the
mast when you are pulling the rotator out. In investigating
the problem, I found that one of the bolts had vibrated in and was
gouging the mast, creating a friction point that impeded the
rotor. I backed them out and secured them so they would not
vibrate back in and it all worked fine. Last night I noticed the
same effect on another tower, and when I climbed it today I found
the same problem. Easy fix.
If you have a similar tower you may want to check
to see if your bolts are secured before you end up damaging your
mast or rotor.