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Valjoux 7750 rotor getting stuck sometimes

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pat2vlour

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Discussion starter · #1 ·
ok, I got a Swiss Army ChronoPro with the Valjoux 7550 and sometimes, the rotor is stuck, not moving in any direction.
When I start unscrewing the screw down crown, about half one turn, it goes back to normal, spinning like crazy in one direction and winding the other.
Any idea what could cause that?
Other then that the watch's running perfectly, but it's worrying me a bit.
 
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#2 ·
Sounds like the autowind reversing wheel might need some oil.
 
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#3 ·
Hi -

Or did the watch receive a major shock recently? The fact that it runs when you loosen the crown points possibly to a distorted case, since it runs fine when the crown is slightly loosened. Some cases have extremely fine tolerances, but are made of materials that can be distorted, resulting in the rotor touching somewhere (alternatively, perhaps the retaining screws are coming loose or the retaining ring came loose as a result of the shock: this would be in a looser case design...).

JohnF
 
Discussion starter · #4 · (Edited)
no major shock, at least not that I remember.
I just need to loosen the crown when the rotor is stuck, but I can screw it immediately after.

actually just realized something, when the caseback is up, the rotor spin freely, no problem.
when the caseback is down (when normally worn), the rotor is lower, almost touching the case, and it has a hard time spinning, that's gotta be the real problem.

I'll bring it to someone, hopefully this can be fixed easily :/
 
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Discussion starter · #5 ·
took it to the watchmaker yesterday, got it back today.
he checked the rotor apparently nothing wrong, go figure. I still have the impression the rotor spun a little better at the beginning..
we'll see if it still gets stuck.
 
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#6 ·
Sorry to resurrect a very old thread but I am having exactly the same problem with a Christopher Ward C40 with the same Valjoux 7750 movement in it. Sometimes the rotor gets completely stuck and I have to pull the crown out to the day/date change and then give it a shake which will free it up again.

Did yours do it again after you had it back from the watchmakers?
 
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