TT's
Having limited enc with the Yaesu thrust bearing. My thoughts are aimed at the
Rohn TB-3 TB-4 style thrust bearings.
These Bearing have been on the Armature scene for many a moon and as Steve has
said Have no provision for a grease fitting and maybe under normal applications
you will get many a year service from them. Well I am a belt and suspenders
type... I learned how to remove the internal allen set screw by die grinding
the punched the secured them in place. The first bearing was removed from a
full size 40 meter beam, The beam was left in the N/E position 95 % of the
time. Upon examining the unit ti was obvious while rotating the base and top in
opposite it felt LUMPY ! like a old COLD bias ply tire . This bearing was to
be used hopefully on my new 40 meter tower project. I disassembled the unit ..
Lot's fun shacking the balls out the little hole where the set screw was :)
you then can separate the two.. WOW the 20 plus years of rocking had in fact
made small shallow incidents from the steel balls. A quick smooth out with a
round noise digrinder crinder smoother it out.. I then got new balls and used
an acid brush to give the race alight coat of blue snowmobile grease.
I have done this procedure on other installations where the TB3 was used...
In the first two weeks of this Oct I rehabbed the 40 meter tower.. New Paint
New feed lines , rebuilt rotor and new Beam ( y'all might remember my
adventures with the CC 240MX ) I also disassembled the TB-3 that was installed
in 1990 18 years ago and it was Shinny ans turned smooth as glass, there was
even a slight residue of the blue grease missed with dust
Sorry for being long winded but I live by the KISS theory and and ounce of
prevention is worth two tons of CURE
my .02
Wayne W3EA
> From: K7LXC@aol.com> Date: Fri, 31 Oct 2008 08:46:35 -0400> To:
towertalk@contesting.com; draxfelton@gmail.com> Subject: Re: [TowerTalk] Thrust
bearing re-grease> > > In a message dated 10/30/2008 8:57:53 P.M. Pacific
Daylight Time, > towertalk-request@contesting.com writes:> > > Could someone
recommend what puller tool I would need to beg, borrow,> or buy to pull a
thrust bearing apart with to re-pack it with grease?> I'm not that familiar
with bearings or whether the tool used for> automotive bearings that a mechanic
might have would work or not. I'm> talking about a thrust bearing that in all
is maybe 6 inches wide.> > Not enough information. What kind of thrust bearing?
Manufacturer? > Material - steel or aluminum? Is it a machine shop pillow block
bearing (square > mounting plate)? Did it come with a tower? > > If the bearing
actually needs greasing, then there will probably be a > zerk grease fitting on
it. If there isn't, then it probably doesn't need > greasing. Typical ham
thrust bearings (e.g. Rohn TB-3, Yaesu) are aluminum and > don't need grease. >
> Cheers,> Steve K7LXC> TOWER TECH> > > > > **************Plan your next
getaway with AOL Travel. Check out Today's Hot > 5 Travel Deals! >
(http://pr.atwola.com/promoclk/100000075x1212416248x1200771803/aol?redir=http://travel.aol.com/discount-travel?ncid=emlcntustrav00000001)>
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