Date: Mon, 16 Apr 2018 21:41:36 -0700
From: Dana Roode K6NR <dana.roode@gmail.com>
To: reflector Towertalk <towertalk@contesting.com>
Subject: Re: [TowerTalk] Slow/Stuck rotator in one direction
<Hi all,
<Thanks to everyone who responded to my email below. I have resolved the
problem, which, long story short, was the thrust bearing. The bearing on
the TX-455 has a "Eccentric Locking Collar". When I got up on the tower
and looked at the bearing it was very dirty. I loosened the allen screw,
freed the collar with a punch, raised the collar out of the way and tried
the rotator again. It worked perfectly. I cleaned it out best I could
with a degreaser, added new grease, and put the collar back down and it all
works fine now.
I was sure how to put the collar back in place; what I read online is that
you use a punch in the direction "the shaft rotates" - which is both ways
in the case of a mast but figured it would be opposite of the way I got it
off. I wasn't sure how the collar fit downward on the bearing but think I
got it right. Couldn't hammer the punch like I read since the bearing
turns. Snugged it up and tightened the allen screw and it seems OK, but
must be a clearer instruction out there for these collars somewhere.
<Dana
## I have a UST HDX-689... which uses a pair of those peer brand
thrust bearings + mating eccentric locking collars. One is at top of tower,
and the 2nd one is down 4 feet into the tower.
Rotor is 6 ft down from the top of tower. I can easily hammer
the locking collar..in either direction..with a small drift punch.
The collar locks in either direction, but the bearing does NOT turn with it.
IE: bearing will turn freely, regardless of whether the locking collar is
locked cw, or ccw, or not locked at all, and is between those two positions.
## You may have the locking collar installed incorrectly. On second
thought,
the mast cant rotate anyway, since its captivated by the rotor. Both my
bearings
came with grease nipples. Just pump correct grease into em, until a bit of
the old
grease oozes out the sides / top of the bearing. You can also replace the
grease fitting
with fittings that have a 45 –65-90 deg angle, if that makes it easier to get
the grease gun in there.
I would put some never seize on those allen screws, or replace em with hex head
types, or SS
hex head types,..and still coat em with never seize. Then you will have less
hassle to get them loose,
if required.
Jim VE7RF
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