Question about Meade ETX-70 (240 x 70mm) Telescope

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Azimuth motor gearing problem

Just picked up a second hand ETX-70. When powering up for the first time, Altitude motor movement is ok, but the azimuth motor, whilst hearing it work, does not rotate. I've checked the horizontal lock. Is this repairable?

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  • tomgrant2003 Aug 12, 2008

    Thanks Tony. I'm in the UK, so will try Meade's local distributor. Out of interest how does one get into the horizontal motor drive?

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I also purchased a used Meade ETX-70, only to find it had the same problem with the rotation axis motor running but no movement. After removing the bottom cover, I found the motor w/worm gear would not contact the main rotation gear. I solved the problem but purchasing a small 3/8x3/4x.032 spring that I had to custom fit to hold the motor w/worm gear against the rotation gear. Take caution not to have the spring apply to much pressure or it will cause to much drag.
To gain access, remove the bottom round cover(it will just pop off).
Then use a small .05 allen wrench to remove the set screw in the horizonal chrome lock. The chrome lock fits over a 1/2" bolt. By removing this bolt you will remove the washer/bearing assembly. After removing this, you will see a nylon nut, use a 11/16 socket to remove. Becareful, it is a fine thread and you don't want to cross thread it!
After you remove this, you will be able to remove the bottom housing, which will expose the motor and gear. You should be able to see what I am referring and where to place the spring.
If you can make it this far, then you should be able to install the spring. I used a little small dab of Gorilla glue to hold it in place, since the spring will have enough constant tension to keep it from moving.
I'm not sure if this was a design flaw, but I got no help from the Techs at Meade, only that they would upgrade to a ETX-80 for $149.99 plus shipping.
Hope this helps.......

Posted on Dec 11, 2008

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Yes you have to order a new one from meade, u can try to take it apart and see if you can order it thru "American Science and Surplus"

Posted on Aug 12, 2008

  • Tony Budz
    Tony Budz Aug 12, 2008

    there should be little covers or keyed screws, you'll have to observe it closely..

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