Contact Rohn then.
They run dry. If they were meant to be lubed they would have a grease
fitting on them.
Mike W0MU
J6/W0MU November 21 - December 1 2011 CQ WW DX CW
W0MU-1 CC Cluster w0mu.net
On 10/12/2011 9:26 PM, jcjacobsen@q.com wrote:
> Doug has a question:
> ----- Original Message -----
>
>
>
> Would either of you gentlemen please provide for me the instructions from
> Rohn that states that their TB-3 thrust bearings are to be run dry. I know
> that they are sold dry. I am looking for facts from Rohn that say that these
> bearings should not be lubricated. I am not interested in any information
> except from Rohn.
>
>
>
> Doug
>
>
>
>> -----Original Message-----
>> I use White Lithium grease. Some rotator manufacturers are using it
>> now. For thrust bearings...It all depends. ROHN says to run theirs dry.
>> 73
>> Roger (K8RI)
> Doug,
>
> #1. I do know that my TB-3 has been in the air since 1991, unlubed, and is
> still going strong.
> #2. I seem to remember that there was a rather limited instruction sheet with
> the new bearing that said don't lube, but I'll be dipped if I can find it in
> my files.
> #3. The fact that it was built WITHOUT a grease fitting, and would have to be
> removed from the tower and disassembled to grease it says volumes in my book.
> #4. The archives show a couple of entries from YEARS ago saying not to lube
> the bearings. They weren't designed to be lubed. One of them is from Steve,
> K7LXC, who should know if ANYONE does:
>
> <SNIP>
>
>
> From: K7LXC@aol.com
>
>
>
> In a message dated 97-01-12, you write:
>
>
>
>> Since this is an open design for a bearing and it's
>> turning slow, one would think it shouldn't need any
>> lube. Right or wrong?
> The LXC Prime Directive for tower and antenna projects is to "do what the
> manufacturer says". The corollary to that is "don't do what they don't tell
> you". In other words, Rohn didn't say to lubricate the TB-3 so you shouldn't.
> Since it only turns one RPM, there's not much that is going to happen to it
> during normal use.
>
>
>
> Lubricating it will actually cause premature failure because the grease will
> hold onto any contaminants that are blown through in the wind (dust, rain,
> etc.). The same is true for crankup cables: do not use a grease on them.
> There are special lightweight cable lubricants that you should use that will
> soak into the cables without attracting contaminants. In the case of Rohn
> thrust bearings, leave 'um alone. And like Rod, N4SI, says, if in doubt -
> throw it away and get a new one.
>
>
>
> Steve K7LXC
>
>
>
>
> <SNIP>
>
>
>
>
> I hope this helps.
>
>
>
>
>
> Good luck with whatever project you have going.
>
>
>
>
> 73
>
> K9WN Jake
>
>
> _______________________________________________
>
>
>
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