I haven't had a problem with that -- there's a very small amount of running,
but not enough to lose the grease layer or mess up the tower. I guess
automotive grease is designed for moderately high temperatures. It hasn't
frozen yet, either.
> -----Original Message-----
> From: towertalk-admin@contesting.com
> [mailto:towertalk-admin@contesting.com]On Behalf Of Richard Zalewski
> Sent: Thursday, February 28, 2002 11:30 AM
> To: dick.green@valley.net; Tower; jbattin@starband.net;
> jimr.reid@verizon.net
> Subject: Re: [Towertalk] US Tower MA-Series Maintenance
>
>
> What keeps the grease from running down the tower when it gets warm?
>
> Dick W7ZR
>
> ----- Original Message -----
> From: "Dick Green" <dick.green@valley.net>
> To: "Tower" <towertalk@contesting.com>; <w7zr@citlink.net>;
> <jbattin@starband.net>; <jimr.reid@verizon.net>
> Sent: Wednesday, February 27, 2002 6:37 PM
> Subject: Re: [Towertalk] US Tower MA-Series Maintenance
>
>
> > MARB owners:
> >
> > I use plain-old automotive grease on the inside surface of the upper
> collar
> > on the rotating base. That's what U.S. Tower told me to use. It's OK to
> lay
> > it on thick. I use a grease gun to squirt more grease between the collar
> and
> > tube when the old grease layer gets thin or rubs off (sometimes I spread
> it
> > around with a popsicle stick.) The grease is important for preventing
> > hangups and also prevents abrasion of the tube. It's conceivable that
> > rotating the tower against an unlubed collar could eventually cut right
> > through the steel and compromise the tube. U.S. Tower hinted about this
> > possibility. As mentioned, don't forget to lube the lower
> thrust bearing.
> >
> > I've found that the single most important factor for preventing hangup
> > (besides greasing the collar) is making sure the pipe section that
> connects
> > the tower drive shaft with the rotor can move freely. It's a poor-man's
> > u-joint. It's there because it's not possible for the mast to
> be perfectly
> > concentric with the rotor -- it moves around too much in the
> upper collar
> > and the very long bottom tube isn't perfectly round and straight.
> Therefore,
> > a flexible joint is needed between the tower and rotor. The short pipe
> > section serves this purpose. If the rotor jaws are too high on the pipe
> > section (say, as high as the bolt connecting the pipe to the
> drive shaft),
> > then the pipe can't move far enough to provide the needed flex. There
> should
> > be two inches or more clearance between the bolt and the top of
> the rotor
> > jaws, more if possible. The same thing can happen if you tighten the
> > aircraft nut on the bolt too tight -- the pipe can't move. Just tighten
> the
> > nut until it rests against the pipe.
> >
> > 73, Dick WC1M
> >
> > _______________________________________________
> > Towertalk mailing list
> > Towertalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
> >
> >
>
>
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