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Help for an A7750 balance irregular rhythm


Hello to all,

I have a problem with an A7750 mouvement, I serviced it and remounted correcly with right lubrification but the rhythm of the balance it’s irregular, do not stop, but walk regular for some seconds and then walk slow for others second.

Any idea to solve that problem ?

Thank you for the help.




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3 answers to this question

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Probably an issue with the forth wheel or escape wheel- a pivot may be bent or there may be dirt in the jewel.  The time elapsed between running fast and slow is the clue- the wheels are turning freely then struggling with friction.  Since the period between fast and slow is less than 60 seconds  I would look closely at the escape wheel pivots and gear teeth.


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Thank  you for the answer, I try to see as you tell me.


Last day the moviment walkdd fine, I tested in the timegrapher , I remounted the watch and I put for one day in the cyclotest and it walked fine , 

I tryed the watch at the wrist and after 10 minuts stop to walk , I moved it a bit and restarted but after two minuts stop to walk.

I re open and the balance walk fast and then low.



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