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: [email protected] <[email protected]> On Behalf Of robert meadows via R-390 Sent: Wednesday, February 11, 2026 5:06 PM To: R-390 Mailing List <[email protected]>; Alex Hopper <[email protected]> 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 <[email protected]> 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 ______________________________________________________________ R-390 mailing list Home: http://mailman.qth.net/mailman/listinfo/r-390 Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ R-390 mailing list Home: http://mailman.qth.net/mailman/listinfo/r-390 Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ R-390 mailing list Home: http://mailman.qth.net/mailman/listinfo/r-390 Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
