[R-390] More - MHZ gear clamp busted - removing gears

[Joe Foley]

--- Mark Richards <mark.richards@massmicro.com> wrote:
> Walter, and others.
> 
> As many of you are very experienced with the R-390,
> I hope you will not
> mind my asking stupid questions. 
+++++++++++
HA!  Go ahead and ask, we all started somewhere and
that was the same place you are now at!



 However I really
> want to avoid making
> mistakes, particularly with the complex mechanics of
> this receiver.
++++++++
In order to avoid this you MUST download THE manual!



> 
> I am in the midst of a breakdown (not nervous,
> although this is also
> approaching) of the geartrain.  I began this because
> the MHZ gear clamp
> is snapped.  In order to get to it, I've first
> removed the front panel
> (taking all the steps outlined by others on this
> great e-mail list).
> Next, I removed the veeder root counter.  Now I have
> two large gears
> staring at me, begging for removal.  A photo of them
> is here:
> http://www.massmicro.com/boatanchors/DSCN9065.jpg
+++++++++++
Confucius say:  First of all we must call everything
by its proper name.

That is the "Zero adjust clutch".  Associate it with
its knob on the front panel.  At this point you can
determine how it works.

IF you should happen to dis-assemble it be sure to
DRAW A PICTURE of it as it comes apart, there is
nothing in the manual about this.  Also, don't assume
that the last owner put it together right.


> 
> The gear in question is the one pointed out.  I can
> determine how to
> remove the other one (there's a clamp).
++++++++++
At this point you may want to check the run-out on
this shaft, its the KC CHANGE knob, being in the
center of the front panel it is a good target for a
shot to the side, it is often bent slightly.


  How in the
> world is the other
> gear removed?  I am very concerned that I will break
> something in the
> process of trying to get it off.  Also, it seems
> impossible to remove
> either of these without winding the KHZ settings
> slightly.
++++++++++
Don't worry about that, you'll do a mechanical
alignment as you put it together, probably needs to be
done anyway.  It'll be good experience for you, too. 
You can clean and lube the gear train while you're in
there. This is the best time to look for other
problems, too.

Take the double gear sets apart and check the mating
surfaces for burrs, remove them with a honing stone,
this will let them slide against each other.

Get a set of dental picks to use when setting the cams
in relation to the gear timing marks.

Can you juggle?

It'll come in handy later.

Joe

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