[R-390] R390/URR Gear train

[Barry]

I presume that, like any other split gear, it should be preloaded a couple of teeth for anti-backlash.  Don't know why it wasn't preloaded when you disassembled it, but maybe someone just didn't do that the last time it was assembled.

Thanks,
Barry - N4BUQ

----- Original Message -----
> From: jgedde at optonline.net
> To: r-390 at mailman.qth.net
> Sent: Saturday, June 8, 2019 12:39:26 PM
> Subject: [R-390] R390/URR Gear train
> 
> I took apart my geartrain for cleaning this morning on the 390.  No end to
> solidified lubricant.  Now I'm putting it back together.  I noticed before I
> took it apart that the big brass split gear (part 73) wasn't preloaded.
> Nowhere in the manual does it say how this should be done or what it's
> supposed to preload.  What is this for?  It meshes with another gear
> assembly (79) that has two gears separated by a spacer.
> 
>  
> 
> I've attached a photo of what I'm asking about.
> 
>  
> 
> John
> 
> 
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