My main setup for astrophotography-2

It occasionally gave me trouble with guiding. But that might have been solved by calibrating the guide. Besides that, there were a couple of times when, controlled by the ASIAIR, it pointed completely away from where I told it to go. I have no idea why.

I have this quirk with my mount where it behaves erratically at sub-zero temperatures. The issue is with performing alignment and slewing to targets, specifically with the RA axis. The declination axis moves fine. Through experimentation, I discovered it starts working normally if I remove the top cover—the one held by six screws that encloses the worm gear and gears. But as soon as I put the cover back on and lightly press it into place, it immediately glitches, grinds, and doesn't rotate properly. I still need to test all this in the field. So that's the situation. What's causing it is a mystery—maybe a bad contact somewhere—but in the summer, everything works flawlessly.

The only thing that comes to mind. Have you checked the worm gear mesh? I had a case where the mount was acting up after a rebuild and grease change. It turned out the worm gear on the DEC axis wasn’t pressed firmly enough against the gear. I carefully tightened it, and everything started working right away. Maybe it’s the same for you?

I'll give it a try. I adjusted it a bit, and I'll try checking it during the movement process. Thanks for the advice.