The set screw has been set in with two or three punch set marks. There have
been a few times
I had to use a pointed carbon speed cutter to free up the set screw. ( was at
the point of rounding it off )
I also use a round end de burring tool to smooth out the bearing run surface.
As there are two side to a pan cake there are two opinion regarding lube on as
TB# or TB4 type bearing.
I subscribe to the LIGHT film of snowmobile grease configuration.
and use lock-tight ( Blue) on the set screw when re-assemble .
Wayne ,W3EA
> Date: Tue, 28 May 2013 09:09:23 -0700
> From: hdmc38@bellsouth.net
> To: n4ua.va@gmail.com
> CC: hdmc38@bellsouth.net; towertalk@contesting.com
> Subject: Re: [TowerTalk] Is Rohn TB3 Thrust bearing OK to use with "flat
> spots" on bearings?
>
> Thanks to all. I totally forgot about the set screw. You got your ifo now
> John.
> 73 DE K4XZ Joe Patrick
> God Made Man
> Sam Colt Made Them Equal
>
>
>
>
> ________________________________
> From: George Dubovsky <n4ua.va@gmail.com>
> To: Joseph or Ruth Patrick <hdmc38@bellsouth.net>
> Sent: Tue, May 28, 2013 11:39:22 AM
> Subject: Re: [TowerTalk] Is Rohn TB3 Thrust bearing OK to use with "flat
> spots"
> on bearings?
>
>
> In general, the bearing balls will be fine (diametrically) but the races will
> have pockets worn in them - this is the most common failure on the TB-3. The
> balls are steel, the races aluminum. The bearing will not just come apart.
> Look
> for a set screw in the collar. It will probably be rusted/corroded in place;
> soak it with penetrating oil like Kroil or PB Blaster and let it sit for a
> while. Put a good fitting hex wrench in the set screw, remove it, and you
> will
> be able to shake the balls out one by one (over a bucket, hopefully... ;-)
> Then
> the bearing halves will come apart.
>
> Clean, and reassemble in reverse order - do not use grease.
>
> 73,
>
> geo - n4ua
>
>
>
>
> On Tue, May 28, 2013 at 10:52 AM, Joseph or Ruth Patrick
> <hdmc38@bellsouth.net>
> wrote:
>
> If the bearing races are good then you could just replace the bearings.
> >You should be able to buy them at most bearing supply houses. The top of a
> >TB-3
> >just lifts off and the bearings spill out everywhere. Put the bearing in a
> piece
> >of Tupperware to catch the bearings. As I recall the bolts are not stainless.
> >They do have a point on one end and a square head. Just take it apart, If the
> >races are good then get new bearings. and put it back together. NO GREASE.
> >The
> >bolts could probably be galvanized or stainless. Just use the proper
> >installation for whatever type you use. Grade 5 or up.It's been awhile since
> >I
> >have looked at one so correct me if I'm wrong. Maybe you even have the
> >bearing
> >one your bench. Much easier to work on Good Luck
> > 73 DE K4XZ Joe Patrick
> >God Made Man
> >Sam Colt Made Them Equal
> >
> >
> >
> >
> >________________________________
> >From: John W <xnewyorka@hotmail.com>
> >To: TowerTalk <towertalk@contesting.com>
> >Sent: Tue, May 28, 2013 10:12:07 AM
> >Subject: [TowerTalk] Is Rohn TB3 Thrust bearing OK to use with "flat spots"
> >on
> >bearings?
> >
> >
> >I have an old Rohn TB3 that came with a used tower I bought. Cosmetically it
> >looks good and spins without any unusual noise, but it feels like the
> >bearings
> >are somewhat oval in shape instead of round. It's hard to explain, but it's
> >almost like a sort of ratcheting effect, like there is a little notch every
> >few
> >degrees, so that it almost 'clicks' into place, but without a clicking sound.
> >
> >
> >I haven't tested it with a load, but I assume it would probably spin OK with
> >only a very small increase in friction.
> >
> >
> >
> >
> >Can it be used like this, or does it need to be repaired? If it needs to be
> >repaired, how does it come apart and where can I obtain replacement bearings
> for
> >it?
> >
> >
> >
> >On a related note, is it recommended to use stainless bolts for the set
> >screws
> >that hold the mast in place, or galvanized? (The originals are gone.)
> >
> >
> >
> >Thanks,
> >
> >
> >
> >John
> >
> >W2ID
> >
> >_______________________________________________
> >
> >
> >
> >_______________________________________________
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> >TowerTalk@contesting.com
> >http://lists.contesting.com/mailman/listinfo/towertalk
> >_______________________________________________
> >
> >
> >
> >_______________________________________________
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> >TowerTalk@contesting.com
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> >
> _______________________________________________
>
>
>
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