[R-390] Oops, new mechanical problem (and comments on procedure)

[Grayson Evans]

Thought I would post an update on this problem.  I finally had a little time to work on it again this weekend.
Turns out it was not as hard as I thought to get the 8-16 MHz cam in the right place.   It is possible to remove the top gear on that cam by removing the three screws that hold it on, after the gears are fully assembled.  (the gear in STEP #6)
Then only the 8-16 MHz cam and the 16-32 and 4-8 MHz cam move together.  Once the 8-16 is in the right alignment, the other two cams can be loosend and moved back where they belong.  It is a LITTLE tricky to get the gear back on, spring tensioning the split gears.  Took me about an hour.
Sure beats tearing the thing down again.
Fortunately I had the geneva gear in the right location.

On Mar 16, 2015, at 9:03 PM, Grayson Evans <wa4gvm at gmail.com> wrote:

> Thanks for the suggestions Don, Phil, Roy.  
> If I have to I’ll tear it down and start over.  Once you get the hang of it, it isn’t too hard,
> But first I will try a few things to see if I can’t get the gear attached to the shaft to turn by unscrewing the gear that it meshes with.  
> It will take me a few days to get back to it.  Will let you know.
> 
> A comment on the step-by-step photo procedure by Scott Seickel (THANK you Scott for making this!)
> 
> The steps shown get less detailed at the end.
> At STEP 16, you have to put the gear that turns the KC digits on the counter on BEFORE (or with) the Clutch Assembly gear.
> If you assemble up through STEP 18, you can’t get the counter gear on as shown.
> The steps don’t show that small gear except in the photo of STEP18
> 
> I have not been able to find any detailed explanation about the mechanical alignment in one place,  
> When I get some time, I hope to write up my notes at least to help fill in some gaps.  Gaps that obviously I encountered!
> 
> THANKS,
> 
> On Mar 15, 2015, at 11:18 PM, Don Heywood <wc4g at knology.net> wrote:
> 
>> OH, OH, now you will really get to learn about that RF deck. I usually set 16MC cam before I get going on reassenbly and alignment. Just off the top of my head I think you can loosen the clamp and slip the large MC gear (MC knob) out of engagement and then using your thumb run the RF train around until the 16MC cam comes into alignment. Now re-engage the MC shaft gear and now go thru the cam/bandswitch settings again. Don't forget to preload the split gears when engaging these gearsets. This will reduce any backlash while operating the radio. Let me know if I can provide any further assistance. You still have to set the PTO.
>> 73
>> Don WC4G

Grayson
TA2ZGE - Ankara, Turkey
KJ7UM
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