[R-390] Removing Megacycle Change shaft

[Barry]

You might have better luck with a different solvent other than isopropanol.  Naphtha works well for me but others have their favorite degreasers.

Synthetic oil is my choice for lubricating the shafts and bushings as well as the rollers for the slug racks.  It doesn't harden over time.  A bit of oil on the gear teeth should be enough.  There's really not much need for grease on those teeth.  If you've gone so far as to disassemble the gear train, then some oil between the split gears is good as well.

Aligning isn't all that difficult.  There is documentation in the manuals as to how do that but the folks on the list can offer good advice as well.

Have fun,
Barry - N4BUQ

> I have panel off and waiting for a gear clamp off a MC shaft assembly I just got
> on eBay.
> 
> Going forward, is there a COMMERCIAL source who sells clamps that would work as
> gear clamps, (Bristol or hex or slotted) for other clamps that might break?
> 
> Thanks for the help. I might need help with aligning this thing to read correct
> frequency when I am done, lots of gears! But I will read the literature and
> hope I get it. At least now that this is apart I can clean off the gears/gear
> teeth with isopropanol and “re-lube”. I assume just put light oil on the shafts
> themselves, not the teeth on the gears?
> 
> Paul
> 
> From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> on behalf of
> Jacques Fortin via R-390 <r-390 at mailman.qth.net>
> Date: Wednesday, June 17, 2026 at 8:17 AM
> To: Paul Roche via R-390 <r-390 at mailman.qth.net>
> Cc: R390A <r-390 at mailman.qth.net>
> Subject: Re: [R-390] Removing Megacycle Change shaft
> 
> Chapter 10 again: Read everything to the end !
> Jack14 iPhone 16e
> 
> Le 16 juin 2026 à 23:09, Paul Roche via R-390 <r-390 at mailman.qth.net> a écrit :
> 
>
> <image0.jpeg>
> <image1.jpeg>
> 
> Sent from my iPhone
> I dont know if you can get see this. Now what? I see how to remove the KHZ gear
> but not sure about the clutch disk and the “gear” above it.
> 
> Paul
>> On Jun 16, 2026, at 10:09 PM, Jacques Fortin via R-390 <r-390 at mailman.qth.net>
>> wrote:
>>
>> Here is the needed clamp.
>>
>> 73, Jacques, VE2JFE in Montreal
>>
>> Hello Nick,
>> Good try, but the hole on this one is too big (0.435) the one to be replaced
>> measures 13/32" (0.406).
>> <00-99-SM-B-178486-CLAMP.pdf>
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