[R-390] R390/URR Gear train

[jgedde at optonline.net]

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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