[R-390] replacement R390A gear clamp source

[Paul Roche]

It is a Cosmos 136-1 PTO, SN 21195 (I think that’s means it’s a pretty late one).
Sent from my iPhone

> On Jul 25, 2026, at 11:23 AM, Jordan Arndt <Outposter30 at shaw.ca> wrote:
> 
> Paul....What you're seeeing is the cover for the adjustment....the real adjustemnt is hidden behind that cover screw which you need to remove. Behind it is a small slotted brass rod that you adjust...I wouldn't try to adjust it until you're sure you have everything properly synchronized.
> 
> What type of PTO is it...? Collins type or Cosmos type...?
> 
> YMMV....73...Jordan VE6ZT
> 
> ----- Original Message ----- From: "Barry via R-390" <r-390 at mailman.qth.net>
> To: "PAUL ROCHE" <rochep at comcast.net>
> Cc: "R-390 Mailing List" <r-390 at mailman.qth.net>
> Sent: Saturday, July 25, 2026 9:16 AM
> Subject: Re: [R-390] replacement R390A gear clamp source
> 
> 
>> Paul,
>> 
>> I wish I could give you good advice on that one but I think you have a slightly newer(?) PTO than mine.  Yours has an adjustment for the transformer and mine doesn't.  Either way, with mine insutu, I can't quite see that adjuster so not sure.
>> 
>> HOWEVER, if you've adjusted that screw, check both ends of the PTO as it may not be changing the end you're checking.
>> 
>> Looks like that clamp will get there on time so I hope things go back together good for you.
>> 
>> Barry - N4BUQ
>> 
>>> In anticipation of my new clamp, I thought I would set the end point on my PTO.
>>> It goes from2455 to 3450, it’s off by 4 KC. I thought I might try and adjust
>>> it. But I am not sure I’m looking at the correct endpoint adjusting screw. Is
>>> it the one just above and to the right looking at the PTO? It doesn’t look like