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10 TE Gem Lube Job

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#1 Mr Magoo

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Posted 25 December 2013 - 09:10 PM

Finally decided to due a long overdue regrease on my 10te mount.

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#2 Mr Magoo

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Posted 25 December 2013 - 09:15 PM

After stripping out the old felt. I found this brass retaining ring. Not what I expected. Other threads like Preston's have shown a different version of this mount. I'm assuming I need to remove the flat head screw and then unscrew the brass ring with a spanner wrench that I do not have. This will have to wait. Spanner wrench is on the way from S.K. Grimes.

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#3 Mr Magoo

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Posted 25 December 2013 - 09:19 PM

Next to remove the right ascension yoke I first remove the cover plate. All of this is basically the same as in Preston's thread which is now in archives. Servicing a Sears or Tasco 3" Equatorial Mount

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#4 Mr Magoo

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Posted 25 December 2013 - 09:23 PM

Red gasket removed now reveals the friction ring.

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#5 Mr Magoo

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Posted 25 December 2013 - 09:26 PM

Friction ring should now lift out. Mine was stuck in pretty good with old grease.

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#6 Mr Magoo

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Posted 25 December 2013 - 09:36 PM

The yoke can now be slid off. My first puzzling thing has cropped up. If you notice there are 2 red fiber gaskets or bushings. This seemed redundant to me and I'm not sure why the smaller one is there. Also there was not a similar one on the opposite end of the yoke under the cap. I'm not sure if this mount has ever been apart or not. I looked back on several threads trying to see a picture of what others had, but had no luck.

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#7 Mr Magoo

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Posted 25 December 2013 - 09:39 PM

The 2 gaskets. Smaller one was on top of the larger one contacting the edge of the worm gear wheel.

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#8 Mr Magoo

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Posted 25 December 2013 - 09:40 PM

Bushings removed.

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#9 fjs

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Posted 25 December 2013 - 11:03 PM

Thanks for posting your progress with this job, Ken.

My mount could use the same TLC, But the idea of starting the job sure does scare me.

Meanwhile, it does work as-is.

I think you have more guts than I do!

P.S. I'm a retired aircraft mechanic.

#10 Mr Magoo

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Posted 26 December 2013 - 05:12 AM

Thanks Frank. Not really a lot in there to worry about. Mine was unusable in the cold. Hopefully someone has some insight or hidden pictures about these bushings. I'm in no hurry to get back outside with this weather anyway lol.

#11 fjs

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Posted 26 December 2013 - 05:39 AM

You do know about this thread , don't you?

#12 Mr Magoo

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Posted 26 December 2013 - 05:48 AM

I have a link to it in my 3rd post down.

#13 fjs

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Posted 26 December 2013 - 06:00 AM

Oops. Yeah, it's been a long time since I originally read through your posts! :foreheadslap: :gramps: Wa..what were you saying :question:

#14 semiosteve

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Posted 26 December 2013 - 09:27 AM

Please keep us posted on how you do with regards to removing this retaining ring. I got to the same point and even with the spanner tool the ring keeps getting stuck as I try to remove it. Someone had mentioned used Liquid Wrench and that there might be a bur causing the problem. All I know is I gave up for a couple months. I hope you have better luck!

#15 hottr6

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Posted 26 December 2013 - 12:49 PM

Never seen the insides of those GEMs. Nice looking design and castings. Sure does make Towa GEMs look "cheap and tiny". Thanks for posting.

#16 Bill Griffith

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Posted 26 December 2013 - 04:05 PM

Makes the Mayflower's equatorial in the herd, with the same OTA kind of undersized as well :(.

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#17 Mr Magoo

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Posted 26 December 2013 - 04:54 PM

Will do Steve. Hopefully the SK Grimes spanner will do the trick. I have one of their flat tip models I have used for working on lens cells and they are beautifully made. Very robust tool. The holes in the ring look somewhat "distressed" like someone may have had a go at it in the past. I will pre-soak it with a little penetrant first.

#18 rcwolpert

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Posted 26 December 2013 - 08:57 PM

Friction ring should now lift out. Mine was stuck in pretty good with old grease.

I heard that many old telescopes from Japan were lubed with cosmoline which dries as hard as a rock after time. That may have been what was used here. I purchased a 1950's Unihex that had the same problem. You needed a tire iron to get it to turn.

#19 Mr Magoo

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Posted 26 December 2013 - 09:05 PM

It has no lubricating properties left at all that's for sure. I'm wondering what is safe to use on the red paper bushing material to get them clean? Also, hoping someone will chime in here, should lubricant be applied to the red gasket/bushings?

#20 Mr Magoo

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Posted 26 December 2013 - 09:19 PM

I have removed the polar axis body. I first completely unscrewed the black plastic polar axis clamp handle, removed the 2 washers, and then gently tapped out the clamping bolt with a rubber mallet. I then worked the axis body out gently so as not to damage the 2 red fiber paper bushings.

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#21 Mr Magoo

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Posted 26 December 2013 - 09:26 PM

The sticky old grease is all over this section all the way down to the hour circle. I decided to go ahead and remove the hour circle so as not to damage it while cleaning the piece. It is removed by taking out the 4 small screws with brass washers underneath. These are not completely tight so the circle can be rotated when in use.

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#22 Mr Magoo

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Posted 26 December 2013 - 09:27 PM

All stripped down now.

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#23 CharlieB

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Posted 26 December 2013 - 09:36 PM

Any good solvent can be used to clean the red fibre gaskets. Try Goo-Gone or a citrus solvent. Yes, employ lubricant to the gaskets. I use SuperLube, but others have had success with other products. I have six of these mounts and they are tricky to get properly adjusted.

#24 Mr Magoo

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Posted 26 December 2013 - 10:23 PM

Thank you Charlie. Super Lube is what I use on my mounts also.

#25 Wisconsin Steve

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Posted 26 December 2013 - 10:31 PM

Looking great Ken! That old grease more resembles glue on some of the old mounts I have taken apart. Someone here on CN recommended this grease - http://www.militec1.com/grease11.html


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