Problem with valjoux 7750 movement
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  1. #1
    Member pwong017's Avatar
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    Problem with valjoux 7750 movement

    Hey all,

    I wanted to know if someone can help me.

    When I wind my valjoux watch manually, the rotor in the back spins. Does it mean that the rotor is tightened too tightly and is it an easy fix?

    Thanks and I appreciate any help
    Current collection: Oris F1 <<-- used to be daily wear, but now in winder
    Ball Engineer II Diver <-- wear on occassions
    Seiko Sumo <--- just nice to have a Japanese watch in the collection

  2. #2
    Member geoffbot's Avatar
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    Re: Problem with valjoux 7750 movement

    Dunno. Mine moves very slightly when I wind it, but not much.

  3. #3
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    Re: Problem with valjoux 7750 movement

    If it rotates consistently , it needs a service/repair - jammed reversing wheel

    If you just see it kick slightly, depending on the watch's orientation and the rotor's orientation, then that's normal

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  5. #4
    Member Dienekes's Avatar
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    Re: Problem with valjoux 7750 movement

    Can't say mine ever does that but I'm sure every variation is different. If this is a new thing for your watch, have it looked at.

  6. #5
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    Re: Problem with valjoux 7750 movement

    If it spins like this:



    Then the reversing wheel is not working correctly as noted by another poster. This is not a DIY on a 7750 for sure, so best to take it to your local watchmaker who can do the work.

    The reversing wheel in a watch like this is a small assembly of two wheels (gears) and between then a ratchet and pawl system. Here is one from an ETA 2824-2 that shows the construction:



    The two wheels should spin together in one direction, but when spun in the other direction, one should spin and one should not. Yours is not disengaging when spun in either direction.

    Hope this helps.

    Cheers, Al
    geoffbot, watchma and CMTFR like this.

  7. #6
    Member geoffbot's Avatar
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    Re: Problem with valjoux 7750 movement

    Good info there - thanks Al. Mine moves a few mm - nothing more.

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