[R-390] Cosmos PTO, spring-loaded linearizing core?

[JMILLER1706 at cfl.rr.com]

I think there's your problem.  With all that goop in there it could be 
that some found its way into the linearizing coil and has dried hard, 
keeping the coil from moving.  Try a squirt of denatured alcohol to the 
insides of that little coil to see if it will start moving in and out 
better.  BTW my PTO looked like that on first being opened.  There is 
not supposed to be large amounts of grease in there.  Just a dab on the 
main lead screw (that the large core runs on).  I have also found dried 
grease in the main tuning shaft bearings and grease seals where the 
shaft exits the front.  This caused stiff tuning and backlash.  As long 
as you have that apart, you can clean the bearings and produce a much 
smoother tuning action.

----- Original Message -----
From: Tim Shoppa <tshoppa at wmata.com>
Date: Monday, February 27, 2006 10:05 am
Subject: Re: [R-390] Cosmos PTO, spring-loaded linearizing core?
To: r-390 at mailman.qth.net

> One further thought:
> 
> My PTO is evidently a Cosmos PTO that had been rebuilt by
> Raytheon in the 70's.
> 
> I compare the innards of mine (covered with grease, goop, and
> shellac) to Jim's pictures at
> 
>  http://www.r-390.com/cosmos.htm
> 
> and I'm stunned at how shiny his is. In mine the reducing gear was
> slopped in tan/grey grease, much of which was running all over the
> feed-through wires. Much of this grease was also on the screws/
> screwplate etc. too. Some was leaking through into the back of the
> can and seeping out of where the inductors screw down to the 
> baseplate.I've been able to clean up much of it.
> 
> I think Raytheon royally screwed my PTO up 30 years ago. But, if
> I can get the slug to slide again I'll be home-free!
> 
> Tim.
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