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Need corrector plate retaining ring gasket

Need corrector plate retaining ring gaskes and azmith motor

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These parts are only available from Meade, or if you find an old scope on astromart.com that is being torn apart and sold as parts. You might find a replacement gasket at a well stocked hardware store--- maybe?

Meade customer service:

http://www.meade.com/support/index.html


Posted on Aug 02, 2010

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1 Answer

Focus knob will not work


The focus knob turns on a threaded rod which passes through a focus lever, which is secured to the back of the primary mirror. The end of the rod where it passes through this lever is secured by 2 jam nuts, one of which has probably fallen off.
http://ngc1514.com/Celestron/disassem.htm

To fix this you will have to take the front corrector plate off, find the nut rattling around in there, and tighten it back onto the end of the focuser rod, as shown in the diagram. I'd use a little Loctite as well.
This is not difficult, and you can clean the inside of the corrector plate while you have it off. The only precaution is to mark where the corrector plate was, and replace it at the same orientation. Some opinion has it as being worthwhile to also get the secondary mirror centered on the corrector, and the corrector then centered in the end casting. An accurate rule or vernier calipers can be used. Don't tighten the screws on the corrector plate retaining ring much more than hand tight.
http://www.astromart.com/articles/article.asp?article_id=594

http://www.darkatmospheres.com/music/C11_Project/index.html

http://www.celestron.com/c3/support3/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=1655&nav=0,214

http://www.nexstarsite.com/OddsNEnds/SCTCorrectorRemoval.htm

http://www.laughton.com/paul/rfo/c11-disasm.html

Apr 29, 2012 | Celestron NexStar 4 SE Telescope

1 Answer

Lube stain on Secondary mirror on CPC 1100


Probably lubricant out-gassing which can collect than drip. Your choices are to contact Celestron service or do it yourself. DON"T PANIC! It is not that hard if you are brave.
1. Use a piece of masking tape on the corrector to the side of the housing.slice it carefully where they meet. This will insure correct alignment with the primary when you put it back together. (Correctors are sorted then oriented to,(as the name says) correct the primary.
2. Remove the corrector plate. Mark any shim locations with a marker on the outside of the corrector plate (remove after re-installation)
3. Make a solution of 50% distilled water and 50% isopropyl alcohol. (97% pure or better- I use 99% pure alcohol) 1 drop of dish detergent may need to be added,depends on the stain.
4. Rinse the secondary until grease is gone. Do not rub mixture on mirror, just keep rinsing.
5. Rinse with pure distilled water,gently stand corrector up to dry.
6. Assemble the scope. Use the same water/alcohol mixture to clean up the outside of the corrector. Dampen cotton balls and wipe with VERY light pressure.Wipe once, throw the cotton ball out and use a fresh one. Do not make the cotton balls too wet, you don't want moisture to get under the corrector.
7. If the stain is really tough, acetone may be used without damage to the mirror surface.
8. Use surgical gloves to avoid fingerprints.
9. Lots of towels at work area in case the corrector slips out of your grip.
10. If you put it together correctly, minimum collimation will be required.
There have been a number of these problems cropping up lately, I think Synta is using inferior grease now.If you are really brave, clean the old grease
off and add one drop of lithium grease. Run the primary through focus range a few times to distribute.
If you do this, you can later flock the inside of your scope to increase contrast.

Dec 29, 2011 | Celestron CPC 1100 GPS (XLT) (70 x 280mm)...

1 Answer

Loose nut inside telescope


Yuck! This is probably the primary mirror shaft nut. If you don't do anything it will eventually come off and smack the primary! This is not for the faint of heart. You must remove the corrector plate, reach down and CAREFULLY tighten the nut back up. The corrector plate is oriented to the primary. The manufacturer sorts corrector plates to mirrors. Before you remove the corrector, use masking tape to mark the exact placement of the corrector.(put the tape on the plate and the housing, then slice the tape at the edge). Might as well flock the inside of the scope while you have it open. It will increase contrast!

Dec 25, 2011 | Celestron NexStar 5 Schmidt Cassegrain...

1 Answer

Brokin front corrector plate (front lense, need replacement)


Celestron can replace that corrector plate but you will not like the cost. Call them to get the exact cost but I believe it is about $750. The corrector plate must be matched to the primary mirror and then collimated on an optical bench.

Sorry but this will not be a low cost repair-- call Celestron here:
http://www.celestron.com/c3/page.php?PageID=37

Jul 19, 2011 | Celestron Optics

2 Answers

I lent my Celestron 9.25 SCT to a friend and he said he had collimation issues. He said he couldn't find the collimation screws on the secondary so he unseated the retainer ring and pulled the secondary...


Yes because the corrector plate must be replaced in the exact position it was removed. There were probably also small paper or cork "shims" around the glass plate that must also be replaced exactly. Your friend messed up your scope most likely.

YOU DO NOT need to remove the corrector plate to collimate an SCT. The collimation screws are on the center of the plate and accessible from in front of the scope.

Mar 08, 2011 | Celestron CG9-1/4 9.25-inch Schmidt...

1 Answer

My '99 Silverado 1500 Z71 has been an awesome dependable truck with over 225000 miles. But we've suddenly lost the reverse gear. The drive gears work fine & the tranny fluid is fine so what would cause...


No reverse, here are few things you can try before needing to take it to a tranny shop. The 4l60e trans is a fully electronic trans. And being so the problem could be as simle as the reverse shift solenoid has shortted out. Along that same line the reverse valve could be stuck and or the little screen that is attatched to the mid plat could be clogged and in order fix this problemyou need to drop out the valve boby and for the most part rebuild the reverse circute.

Now for the hard stuff. Other problems you could look at.
imput housing assembly - 3-4 apply ring stuck in applied position.
- forward clutch not releasing
- turbine shaft seals missing,cut or damaged.

manual linkage - not adjusted

oil pump assembly - retainer and ball assembly missing or damaged.
- stator shaft seal rings or ring grooves damaged.
- stator shaft sleeve scored or damaged.
- revers boost valve stuck, damaged or misassembled.
- cup plug missing.
- restricted oil passage.
- faces not flat.
- converter clutch apply valve stuck.

valve body assembly - 2-3 shift valve stuck.
- manual linkage not adjusted.
- spacer plate and gaskets incorrect, misposition or damaged.

reverse input clutch - clutch plate worn.
- reverse input houeing and drum assembly cracked at weld.
- clutch plate retaining ring out of groove.
- return spring asembly retaining ring out of groove.
- piston deformed or dished.
- seals cut or damaged.
- retainer and ball assembly not sealing.
- restricted apply passage.

lo and reverse clutch - clutch plates worn.
- clutch plate retaining ring mispositioned.
- porosity in piston.
- seals damaged.
- return spring assembly retaining ring mispositioned.
- restricted apply passage.

case - cover plate gasket missing or damaged.
- cover plate not torgued correctly.
- porosity.

now thhis came from my 4l60 service book.
hope this helps

Thank you for using fixya and be safe


Jul 04, 2010 | 1999 Chevrolet Silverado 1500

2 Answers

Oil in spark plug housing


replace valve cover gaske

Nov 24, 2009 | 1993 Honda Accord

1 Answer

Make the corrector plate meade 203mm


Meade will NOT sell you a corrector plate. They will want the scope back. The corrector plate must be matched optically with the mirror. It is VERY expensive to make this repair, and may not be economical to do. Call Meade:

http://www.meade.com/support/index.html

Oct 17, 2009 | Meade Optics

1 Answer

All Engine Gaskets leaking oil. Suspect Brake fluid added to oil resevoir. 2002 pontiac sunfire motor 2200. Can I replace gaskets and what gaskets do i need


Well If you did happen to get Brake fluid in your Engine some how. The gaskets you would need would be the valve cover gasket, head gasket,Header gasket, Waterpump gasked, Front and rear main seals,and Thermostat gasket.

Jul 14, 2009 | 2002 Pontiac Sunfire

1 Answer

How to remove the corrector lens of a Nexstar 4


I would not try to remove the corrector plate-- the manual states to return the scope to Celestron if the inside of the corrector needs cleaning.

If removed the corrector has to be replaced in the EXACT position it was in before you took it apart-- the alignment between the front corrector plate and the rear mirror and the secondary mirror was done on an optical bench at the factory.

I doubt that will you notice or be able to see the small stain while you are observing--

Mar 15, 2009 | Celestron NexStar 4 GT (240 x 102mm)...

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