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ZEQ25 Dec Axis backlash. Lubrication?

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#1 larryjh

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Posted 05 December 2020 - 11:37 AM

Hi All,

   I have a ZEQ25 mount that I am getting nice imaging results from, but it has significant DEC backlash, which is an issue for guiding.  I am trying to tune up the mount and have disassembled it to be able to access the DEC axis.  I have noticed that the rotation of the DEC axis is somewhat stiffer than the RA axis and is also stiffer at different parts of a full circle of rotation than others.  So, I am hoping to somehow make the rotation smoother.  I was wondering if anyone has done this.  Here are two photos of where I am:

 

view from gear side:

DECaxis1.jpg

 

view from other side:

DECaxis2.jpg

 

I'm afraid to proceed further because I'm not sure if I should try to remove the axis or how I would do it.  There appear to be two tiny set screws on a retaining ring on the internal side (second photo).  If that's what they are, they are very difficult to access and I don't seem to have a small enough hex wrench.  Maybe there is a way to lubricate the axis without removing it.  I would appreciate any input. 

 

Also, if anyone has made any adjustments to their ZEQ25 that have improved DEC backlash, I would love to hear about that too.  I have attempted to put a small roller from a tape deck into the DEC housing to tighten the belt but it doesn't seem to have helped.  Here is a photo of that:

 

Belt.jpg

 

Thanks for any responses!

 



#2 larryjh

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Posted 07 December 2020 - 10:19 AM

I'll bump this once in case anyone can chime in.  I know most people have moved on from their ZEQ25.  Perhaps I should have made the title "vintage mount" to get more interest!



#3 Waldemar

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Posted 08 December 2020 - 01:49 PM

Sorry I can't help you with the adjustments for this mount, but it is not a good idea to try to lubricate with a different kind of grease then what is in it.
Best thing to re-lubricate would be to take it apart, clean with brake-cleaner and a toothbrush and re-lube with SuperLube grease (the best i.m.h.o.)

Maybe this link cab help you with tuning your mount: https://www.youtube....h?v=-Cjqs4iDW1c

Good luck and succes!


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