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Thread: Celestron SLT motor repair

  1. #1
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    Default Celestron SLT motor repair



    Hi all, I posted some of the initial stages of this problem awhile ago in the beginner section, but decided to write an update in the proper sub forum.

    I had bought a used Celestron SLT 130 awhile back, and was having some trouble getting the GoTo system working. What seemed to be the problem was that the Alt motor was grinding away, tracking very poorly, and causing the initial alignment and subsequent positioning to malfunction. I opened a ticket with Celestron, who said (after a week or so) that my only option for getting the part replaced was a dealer in my country (Canada in my case). Query after query to local and online dealers got me the same answer, no warranty, no part. Some of them generously offered to sell me a new mount, however! All said their hands were tied by Celestron itself.

    So, it was looking pretty grim for my SLT. I decided to tear down the motor itself, and see what could be done. Removed the Alt motor, and opened the metal band that holds it together, destroying one of the flanges that hold it down in the process. Removed the top portion, with the circuit board, and peered inside to see the white plastic drive gear inside the larger housing. All I did was spin it around a few times, then align the top motor portion again. plugged the power lead in again and voila, no grinding sound, and it sounds much like the az motor. Put it all back together and it sounds good, although the band is now held down by duct tape.

    Not sure if it's actually going to track now, but waiting for a starry night to find out.

  2. #2
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    Default Re: Celestron SLT motor repair

    Keeping fingers crossed that your repair works. One thing to be careful of is the gear on the motor shaft inside the reduction gearing case. It's a friction fit that can easily strip.
    SXINIAS

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    ZEQ25 mount;
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    SynScan AZ GOTO Mount;

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    Default Re: Celestron SLT motor repair

    I found out after fixing my motor you can get a new one from Celestron for $23, and other places showed up for a little more $.
    Google the # on the motor/trans unit, I think it was like FAA-01 or so on mine.
    bitsbear_AF likes this.
    Mike
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    Default Re: Celestron SLT motor repair

    I had a very similar problem with a Nexstar 60 GT mount I had picked up for a few dollars. The Alt would not work at all. After removing the arm cover to expose the motors, I found that Alt worked intermittently. The motor was spinning but the drive gear would not move most of the time. If I pressed a bit on side of the motor it would sometimes get the the gears going again.

    I envisioned some stripped plastic gears in gear box below the motor, so I decided to remove the motor and peek inside the gearbox, I also noticed that one of the metal clip flanges holding the motor to the gearbox seemed to be only partially attached. With the motor detached the gears seemed to work flawlessly (to my relief) when spun by hand.

    I carefully reattached the motor, and made sure both of the clip flanges were seated properly - reconnected power, and both Alt and Az have worked flawlessly ever since!!!

    It is now one of the most smooth and quietest slewing goto mounts I have yet seen. Unfortunately, it is one of the "original" v 1.0x GT Nexstars with known buggy firmware that cannot be updated. However I think it might be useful for slewing to a target and tracking reasonably well - still checking this out.

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    Default Re: Celestron SLT motor repair

    Hello bitsbear, these forums are being over run by spammers, the membership has moved to www.theskysearchers.com if you would like to come and join us there.

    In the meantime I will be closing this 5 year old thread as the spambots love to post in revived threads.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier
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