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Re: [TowerTalk] Yaesu GS-065 thrust bearing

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Yaesu GS-065 thrust bearing
From: "Roger (K8RI) on TT" <K8RI-on-TowerTalk@tm.net>
Date: Mon, 02 Jun 2014 23:16:54 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On 6/2/2014 1:12 PM, David Robbins wrote:
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?

Welll...I'm in central Michigan. About 25 miles from Saginaw Bay (fresh water) and many hundreds of miles from salt water, unless you count our winter roads. <:-)) I went through a TB-3 and a TB-4 in less than 6 years. The races wore to the point that the top sat on the bottom and the edges of the races were like razor blades

Admittedly, I overloaded them, but wanted to see if they'd stand up. I don't have the name handy, but there are bearings available that twist-lock to the mast and come in 2 and 4 bolt mounts. I'm sure some of the group have the names and numbers.

They do need a slight mod to keep water from collecting on the bearing. They are smoother, stronger, and a fraction of the cost of TB series of bearings. They do require a yearly greasing (probably more often when located near the coast.)


Jun 2, 2014 01:03:10 PM, charlie@thegallos.com wrote:

Exactly what I'd do if I needed to rebuild a thrust bearing, unless I could get 
some free torlon or vespel (haha, I'm funny, those are crazy expensive and 
overkill)

Low rotation rate, shock loaded, out in the weather, where they wi

Tip over towers that slightly invert the mast when down, only need a collar or collars to prevent the mast from sliding out with "Plastic bearings". A plastic washer between the collars might help.

73

Roger (K8RI)

ll receive little in the way of maintenance is the place where engineering plastics like 
nylatron gsm shine. Heck, I can't see why any tower thrust bearing mfg would do anything 
else except to market to folks who say "ball bearings have to be better than 
PLASTIC"



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