[R-390] Lubricate my 390A/URR

Mon, 16 Feb 2004 16:24:24 +0100

Thanks.
73 de Max  IK0JJZ

----- Original Message ----- 
From: "Barry Hauser" <[email protected]>
To: "massimiliano" <[email protected]>; <[email protected]>
Sent: Sunday, February 15, 2004 1:40 AM
Subject: Re: [R-390] Lubricate my 390A/URR

> Hi Max:
>
> I don't know where you would find those MIL lubricants, but they are
> probably no longer the best choice anyway.
>
> R-390A owners use a number of different favorites.  One is synthetic motor
> oil, such as "Mobil One" here in the US -- 10W-30 or similar.  Some use
> synthetic gear oil which is 70-90 weight.  One quart or liter is enough
for
> at least a thousand radios.  Avoid hypoidal gear lubricant which contains
> sulfur.  Some say the fumes cause oxidation of silver plated contacts, but
I
> just do not like the aroma.
>
> The main reason for favoring the synthetics is that they should never
harden
> up or become sticky. However, someone pointed out that quality regular
oils
> and grease should be good for many years and it would be OK to have to
clean
> and re-lubricate every 5 to 10 years or so.  (In other words, synthetic
lube
> might be over-doing things -- but we are R-390 owners with 75 lb. radios,
so
> perhaps over-doing is something we like to do ;-)  (Like making sure that
> who ever owns the radio 50 years from now is happy with our work.)
>
> You are likely to already have some oil that will do the job.  The main
> thing is to clean the gear train completely and use very little.  A single
> drop on the end of a wire or paper clip is enough for a bearing or
bushing.
> Just coat the gear teeth with a small amount using a brush.  Make certain
> that the rollers on the slug racks (cam followers) spin freely.  (Keep oil
> away from the antenna trimmer shaft.)
>
> I sometimes apply a molydenum paste lubricant to sliding surfaces, such as
> the inside surfaces of the RF deck frame, ends of the slug racks, etc.
You
> apply the paste as if you were polishing a car -- rub it in and buff.  It
> fills the pores in the metal and leaves a slick, dry surface.
>
> Do you have the R2 version of the Y2K manual?  I may be wrong, but I
thought
> some notes were added about lubrication.  If not, you can find more in the
> "Pearls of Wisdom" on Al Tirevold's site.
>
> Barry
>
>
>
> ----- Original Message -----
> From: "massimiliano" <[email protected]>
> To: <[email protected]>
> Sent: Saturday, February 14, 2004 3:50 PM
> Subject: [R-390] Lubricate my 390A/URR
>
>
> In the Y2K-R2 manual I read I have to use MIL-L-7970  and  MIL-G-7421 for
> lubricate my 390A/URR. Were can I buy this type of oils ?
>
> 73  de IK0JJZ   Max
>
> Sorry for my English.
>
>
>
>
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