German Round Top GF Clock

Discussion in 'Clock Repair' started by cjer, Sep 2, 2017.

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  1. cjer

    cjer Registered User
    NAWCC Member

    Jan 12, 2015
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    Hello,

    I picked up a vintage German Round Top GF Clock at an auction with a Mueller movement and a big brass dial. It has a clean movement that runs very dependably. But here is the problem, Every few days, the hands stop moving, but the pendulum continues to swing. The hands are not locked together or anything like that. All I have to do to get the hands to start moving again is to just move the minute hand a little and then it starts moving again. I'm not familiar with this problem. Do you think this is a serious issue that needs professional help or could there be a simple fix?

    Thanks a lot,
    Jerry
     
  2. R. Croswell

    R. Croswell Registered User

    Apr 4, 2006
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    The clutch that allows the hand to be moved is slipping. It could be as simple as the minute hand being loose. Make sure the nut is tight and if there is a tapered pin inste of a nut the the pin has not worked loose or is missing altogether. There are various types of clutches and if the above doesn't solve the problem, someone with knowledge of clocks will need to remove the clockworks and look deeper inside.

    RC
     
  3. R&A

    R&A Registered User

    Oct 21, 2008
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    I agree you have a friction problem someplace.
     
  4. Tinker Dwight

    Tinker Dwight Registered User

    Oct 11, 2010
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    The minute arbor also turns the star cam for the chime/strike.
    The additional friction may be enough to make the clutch slip.
    Make sure the lifting piece doesn't have excess friction.
    When setting the time, there should be a noticeable force to
    move the hands. Too little friction may be an issue with the
    clutch.
    As RC mentions, many of these clocks depend on the minute hand
    to be push tightly back against the arbor to be the tension on the
    clutch.
    Some clock have a separate clutch at the center wheel.
    Some clocks require a crimped tube to be the friction clutch.
    Without pictures of your clock, we can only guess as to how
    it is done on your clock.
    Tinker Dwight
     
  5. lpbp

    lpbp Registered User
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    Aug 25, 2000
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    Most of these have a spider spring acting as a clutch on the center wheel.
     
  6. R&A

    R&A Registered User

    Oct 21, 2008
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    Yeah were kinda shooting from the hip without seeing what we are referring to It's friction loss someplace
     

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