Here is some guidance regarding the lubrication and adjustment of the CG-4.
Although a complete teardown and lubrication is fine if you enjoy that sort of thing, it may not be required. Adjustment of the worms is but a small part of the procedure and can be completed in less than an hour with some simple hand tools.
However, any external gear backlash that exists between the motor pinions and the drive gears is no problem with the Astro-Gadget EQStar kits because they use belt drives! The external gears are eliminated by the conversion and installation removes all play from the belt drive system.
BTW, it may seem like a luxury but the Pro versions of the EQStar kits seem well worth it to me. The high-speed slewing alone is worth the $40 (USD) difference in price between the EQStarEQ3 and the EQStarProEQ3. When controlling my mount with an iPad or iPhone running Sky Safari the high-speed slewing takes the experience to another level.
I am 100% going to change the motor over to the EQ kit, and thanks for letting me know about the PRO version. It would be pretty amazing to actually have a bit of speed slewing. And I read through both of your links, it kind of seems like if you have smooth movement it may be not worth doing a tear down. My mount does seem to have very clean movement. It's pretty much brand new still. Thanks again for the help! I am pretty excited to switch over!
I would imagine that the average PE on a CG-4 would be in the +/- 20 to 30 arc-second range...not too hot for imaging. It could be worth the effort to tear the unit down, clean out the grease and gunk, lap the gears, re-grease and try again. Or not.
I think this class of mount is really designed for visual use, and for that, I'm sure it does just fine.
I wish I could at least just get a few minutes out of it per image. The limitation right now is driving me nuts. My son and I stacked 30 x 20sec (or so) of Andromeda, and as expected it doesn't really cut it. Although we were happy with our first combined effort and it really pushed us to improve. I am hoping the drive Celerondon suggested will help some.
Thank you, just book marked it.