[R-390] R-390 (Non-A) RF Gears Cleaning

[thoyer1 at verizon.net]

What do you mean by "anything of value"?

 I have found it to be a good grease cutter and less aggressive than brake cleaner (which I have used on stubborn grease).

When followed up by targeted lubrication with a light oil (such as the ones you mention) on the sliding surfaces the gear trains work very well. I have radios here that I've used the WD40 bath on that are doing just fine 10 to 15 years later.

Tom
W3TA

Tom

-----Original Message-----
From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> On Behalf Of robert meadows via R-390
Sent: Wednesday, February 11, 2026 5:06 PM
To: R-390 Mailing List <r-390 at mailman.qth.net>; Alex Hopper <ahopper0216 at gmail.com>
Subject: Re: [R-390] R-390 (Non-A) RF Gears Cleaning

 I would not use WD40 on anything of value.
WD-- water displacing formula 40.
Cleaning such I find is quite well accomplished with Brake Cleaner by various manufacturers:  I purchase the lowest price at my pal's NAPA store.
I like Starrett instrument oil as well as KROIL Microil'
Chers AllRobert
    On Wednesday, February 11, 2026 at 01:01:30 PM EST, Alex Hopper <ahopper0216 at gmail.com> wrote:  
 
 Hi All,

I have done quite a bit of reading on the best ways to clean the RF deck gear train on the R-390.  Seems that most people recommend a thorough flush of WD-40.

Does anyone have personal experience with this?  I am tempted to try it, however I am NOT interested in removing my RF Module.  Is this something I can carefully do with the RF module still intact?  I would use a long 'staw' aimed down carefully into the gears.

-Alex
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