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LX200GPS makes a loud howling noise

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#21 meademods47



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Posted 09 January 2018 - 07:09 PM

Hi Mark, thanks for chiming in.

The noise is a loud howling, somewhat like a bad automobile differential, but no grinding.

It's loud enough to mask the normal slewing gear sounds.

It only happens when slewing in the arrow "up" or GOTO in the same direction.

I have inspected the entire motor and plastic gear assembly,

as well as the helical brass worm, and it's meshing with the main gear.

Everything looks aligned and normal. Only when I apply light pressure,

to the motor housing (in any direction), dose the noise stop.

My other LX scopes (LX 90 and a previous LX 200) did not make this kind of noise.


I hope either you, John Piper or someone else is familiar with this issue

Thanks  again.



sound like the adjustment set screw need to be loosened. the worm gear may be too tight agent the main worm drive.


I have seen and herd this noise before and have done the same thing pressing on the worm drive and the noise goes away. adjusting the set screw with the spring will take the pleasure of off the main worm drive...


Iv also just opened my wed sight meademods.com

#22 meademods47



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Posted 09 January 2018 - 07:12 PM

To Mark, Bill and John, thanks again for your ideas.

I did slow the max. slew speed to4 and most of the noise is gone, so it is doable.

Next it's off to re -Train Drives and touch up collimation ( a bit off).

I hope to improve the videos of Mars, Saturn and Jupiter before attempting some DSO images.

My best to all of you for great sessions.


Astrophotography is like being a tightrope walker, you need great balance and sharp focus.



the slew rate should be set at 6 not 4 the max is factory 8 and that is way too fast. setting it to 4 will just take a bit longer for your goto's  to slew to an object...


please visit my new web sight meademods.com

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