[R-390] R-390 RF Deck Reinstall - Loading Two Teeth?

[Cecil Acuff]

The split gears are spring loaded...meaning the two halves have a spring that can tension the difference in the two halves rotational position relative to each other.  When relaxed there is zero difference between their relative rotational positions.  To induce loading, while unmeshed with its mating gear, you rotate the two gears in the split pair a number of teeth relative to each other against the spring tension...you hold that relationship while you mesh that split gear with its mating partner in the gear train.  This tension reduces backlash in the gear train. I mentioned a "number" of teeth because some like a two teeth preload...some one...some maybe three.  It's a trade off...more preload results in a harder to turn geartrain but little backlash...less preload an easier to turn gear train with a bit more backlash.

Hope I didn't confuse the issue.  It's actually more difficult to explain than to do.

Cecil
K5DL

Sent using recycled electrons.

> On Apr 7, 2017, at 9:24 AM, hackmohr at myfairpoint.net wrote:
> 
> Can anyone explain what is meant by "loading gear by two teeth" in the TM-35 manual procedure for replacement of the RF Deck? There are 3 mentions of this in the procedure: (6) "Load the large brass split gear two teeth", (9)"Load the Megacycle Change control drive gear by two teeth" and (12) load the gears two teeth". I'm assuming it's a procedure to keep the RF Deck gears from clashing with the chassis gears when you reinstall the deck?  But I'm mystified as to what and how you "load two teeth". BTW I've started a webpage for a blow-by-blow account of my rebuild if anyone is interested at  http://home.myfairpoint.net/~hackmohr/r390/
> 
> Mark WA2FXM 
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