Date: Mon, 02 Jun 2014 12:12:02 -0500 (CDT)
From: David Robbins <k1ttt@verizon.net>
To: towertalk@contesting.com
Subject: Re: [TowerTalk] Yaesu GS-065 thrust bearing
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I have a tb-3 that has been in the air for almost 30 years now, has outlived
several rotors, a bunch of antennas, and a set of guy wires... and I haven't
looked at it since I put it up there... it just keeps on turning. I have
several others on different towers that have been up there 15 to 20 years that
have never been touched either. just how old are these tb-3's that are
requiring all this work??? have they been used in a salt spray environment?
## I had a pair of NEW Rohn TB-4 bearings on my trylon tower 10 yrs ago.
All 3 set scews, the .375 inch ones..every 120 degs, all rusted out asap,
including the lock down nuts ! They seized up, and I had to drill em out.
They also made this grinding noise after only a few months. I was not
impressed. I use the peer bearings on my UST- HDX-689, two of em. zero
problems. They come with the eccentric locking collar + grease nipples.
## the rohn TB-3-4 are just ball bearings riding in an aluminum race. No
way to lube em either. They are NO bargain for the $$ either. Use a real
thrust bearing....if you want it to last.
Jim VE7RF
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