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[TowerTalk] Thrust bearing

To: <>
Subject: [TowerTalk] Thrust bearing
From: (
Date: Wed, 12 Sep 2001 09:03:55 EDT
In a message dated 9/12/01 1:14:41 AM Pacific Daylight Time, 

> I got 2@ rohn TB-3 bearings and found that the couldn't be lubed.  NO 
>  grease fittings.  I guess this is 'extra care in engineering".  So I 
>  dis-assembled the bearing, drilled vertically down from the top cover to 
>  the race and then drilled at a 90 degree angle to the first hole and 
>  installed a zerk fitting, and then plugged the original hole from the top.

    First, you copied the ENTIRE DIGEST in this post. That was totally 
unnecessary. Please only copy the germane part - NOT the whole thing.

    Your modification of the Rohn bearing was also unnecessary as well as the 
wrong thing to do. The Rohn TB's are designed to be non-lubricated. Since the 
bearings are not sealed, any airborne grit or dirt will be attracted to the 
grease in your bearing and will contribute to premature failure. 
>  Now I've got a pretty good bearing and it can be greased.

    The whole thing only turns at one rpm - what advantage would there be in 
lubricating it? The major failure mode of the Rohn TB's seems to be damage to 
the aluminum races - not rust. Since the races are aluminum, they don't rust. 
The ball bearings can get some surface rust but that typically isn't fatal. 

    Corollary to the LXC Prime Directive:"DID the manufacturer tell you to do 

Cheers,    Steve     K7LXC
Tower Tech 

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