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RE: Tach reduction "gearbox" (52 TD)

To: "'Hermance, Jonathan'" <Jonathan.Hermance@ATK.COM>,
Subject: RE: Tach reduction "gearbox" (52 TD)
From: "Lew Palmer" <>
Date: Tue, 30 Nov 2004 19:09:22 -0600

I've haven't seen replacement shafts or gears for years. I think Moss used
to sell replacements, but I don't think that's true any longer.

You have nothing to lose by trying to braze up the existing shaft, but
obviously you'll want to turn them down again on a lathe to ensure their

I say have at it. You might just save yourself a bunch of change.


-----Original Message-----
From: Hermance, Jonathan [] 
Sent: Tuesday, November 30, 2004 8:27 AM
To: 'Lew Palmer';; mg-t@Autox.Team.Net
Subject: RE: Tach reduction "gearbox" (52 TD)


Having never taken a tach gearbox apart - I can hardly wait.  I have two
failed gearboxes.  They both have the shafts that key into the back of the
generator broken.  Am I likely to be able to: braze the broken shaft parts
together; replace the shafts with something home made; find a commercial
source for replacement shafts; identify a private source with a parts bin of
used shafts perhaps still pressed into serviceable gears?

Jon, TC, TD, TF, SLC, UT

-----Original Message-----
From: owner-mg-t@Autox.Team.Net [mailto:owner-mg-t@Autox.Team.Net]On
Behalf Of Lew Palmer
Sent: Monday, November 29, 2004 5:13 PM
To:; mg-t@Autox.Team.Net
Subject: RE: Tach reduction "gearbox" (52 TD)


The tach reduction gear is not difficult to repair. I've done several of
them over the years.

Usually the problem is that the gears start to wear and eventually start to

To repair: Drill out the rivets and separate the two case halves. Clean out
the old waxy grease. Then put the two halves back together, rotate the two
halves so that the gears engage with each other slightly more than before
(not too tight, but not too loose either). Then redrill two holes in
alignment with the holes on the opposite case half and set new rivets to
hold the whole thing together. Screws and nuts can be used instead of rivets
(which may be hard to find) - but use a lockwasher on each as these things
are subject to a lot of vibration. The now-blank holes can be filled with a
little body putty to seal the off. Regrease and you're done.

1/2 hour max job.

Lew Palmer

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