celestron avx mount problems

Celestron AVX Mount Problems: Find All Your Solutions


The Celestron AVX mount is a heavy-duty telescope mount known for its massive functionality. Frequent usage and mismanagement over time can lead the mount to face several issues.

So, how do we solve the Celestron AVX mount problems?

Tightening the bolt of the clutch knob will lift the movement restriction of the declination. Adjusting the DEC and RA axis at a different angle can solve the problem regarding backlash. In many cases, the mount may have faulty connectors and plugs. Try fixing them before usage.

Not satisfied yet? Don’t worry! You’re in the right place! We’ve discussed the topic in detail to help you fix the issues yourself. 

Let us dive right into it-

Celestron AVX Mount Issues And Fixes

The AVX mount is the smallest of all German equatorial Celestron mounts. It’s computerized with a lot of accessibility functions. But you may face a number of problems with your AVX mount after a period of usage. These problems can affect other areas of the telescope, like problems with Celestron StarSense and such.

Clutch Problems

Clutch problems often surface due to loosened knobs disabling the declination from moving. 

In such cases, the AVX mount will be unable to move beyond a certain point. The loosened knobs will weigh down on the declination of the telescope. Hence, the movement of the mount is limited.


To fix this problem, first, unscrew the knob and take off the plastic piece. A brass box will unveil which is the bolt used for loosening and tightening the clutch.

Reinsert the plastic knob at a different angle. This will eventually fix the issue surrounding the clutch and allow better telescope mount movement.

Backlash Issue

The delay in scope movement when using direction arrows is caused by the backlash. This can usually be a problem when moving in the opposite direction of the scope’s tracking. Bad backlash can cause a lag of more than 10 seconds. 


You need to adjust the tightness of the RA/ DEC axis to fix the backlash issue. This will ensure much better guidance and put less stress on the gears and motors.

We start by removing the counterweight bar of the Dec axis to reveal the tension ring. Loosen the 2 grub screws at the side of the ring with a tiny Allen key. Now insert a slightly larger Allen key into the access hole. Put it against the grub screw to wedge the tension ring tightly against the Allen key. This will hold the tension ring in place when you turn the axis.

Loosen the tension ring by rotating the mount saddle counterclockwise until you feel some vertical play. Move the saddle up and down by grabbing it to test the vertical play.

Tighten it slowly until there’s no play. Finish off by tightening the grub screw.

This operation requires quality Allen keys for precise movements. Here are some of our top picks on Allen keys for you-


Now it’s time to move onto the RA axis. Remove the plastic cap from the axis. You’ll notice that the RA axis has 3 grub screws in its tension ring. The access hold will also be hidden by a control panel cover. Uncover the hole and turn the axis to locate any vertical play. 

Once you are done adjusting the RA and DEC axis, put some new grease on the wheels. That will take care of the backlash issue in your AVX mount. You can try this if you’re having alignment problems with the Celestron telescope.

Connector Problems 

The mount will either see the GPS unit or go for the Starsense instead. Switching the Starsense and GPS to different ports won’t work as well. In the best-case scenario, you’ll only get half a view of both of them. Also, rebooting does no good for such issues. 

This problem can be blamed on dirt-collected pins in the connectors. Sometimes, the pins might get bent down from being left plugged for a long time. As a result, the connectors lose their spring and the points inside the port get bent.


Clean the pins in all the connectors using alcohol.

The bent-down pins can be brought back to their previous form using a dental pick. Use the dental pick to bend them back. Doing so will help the male plug pins get a better connection with the port.

These are the fixes for the most common problems faced in the Celestron AVX mount. Contact Celestron if you are still having a hard time dealing with your AVX mount. You’ll also have to check thoroughly if there’s an issue with your Nexstar hand control. If found, it’s better to fix the issue as soon as possible.


Question: Will the AVX Mount be compatible with any Vixen Plate?

Answer: The AVX mount will be compatible as long as the plate is longer than 100mm. The plate has to be long enough to let the knobs come in contact with it. You don’t have to think much about the width as the Vixen-style dovetails can accommodate 1.75’’ to 3’’ for width.

Question: What’s the latitude range of the AVX mount?

Answer: AVX mount allows a latitude range of 7-77 degrees. This range is enough for precise alignment. The user doesn’t necessarily need to use a pier extension and can avoid it.

Question: What is the Weight Capacity of the AVX mount?

Answer: AVX mount comes with a load capacity of 30lbs. This offers a sturdy enough platform for any AVX optical tubes. Keep in mind not to exceed 50% of the load capacity for optimal performance for imaging.  

Final Words

You have learned how to fix Celestron AVX mount problems. Hope this guide helped you in fixing your AVX mount issues. You can fix the problem on your own from now on with this guide.

We look forward to your valuable remarks. Have a great day!

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