onzenuub 307 Posted October 26, 2009 And again a fabulous one from Francisco. This is a Porsche with A7750 movement. The day/date cannot be changed using the crown. However, the change works at midnight, as following videos shows: Therefore, given the problem that this watch has, there are two possible sources: a keyless work problem or a problem in the piece that pushes the two day/date wheels (double corrector). So we know where to have a look. The screwed case back is removed: The movement is removed: Time to remove hands and dial: It is very easy to remove the day wheel: Red arrow in following picture shows the piece that pushes the day/date wheels (double corrector) when the crown is rotated. As it was said before, this piece is one candidate to be the source of the problem. When I touched it to examine it… it is broken: Red Arrows in previous picture show two parts of the double corrector that are released. One is a washer, and a gear that pushes the wheels. The gear is assembled through the hole shown on the picture. Below the hole, there is a gear that is connected to another gear that rotates when the stem is rotated. To remove the double corrector (the part of it that is not released) we have to remove the date wheel. Following pictures shows the parts to be removed in order to free the wheel: The date wheel has been removed: And now we can remove the broken part. Following picture shows the gear that rotates when we rotate the stem/crown to change the day/date. This gear connects to the gear of the double corrector: The broken double corrector: I tried to repair the double corrector…. With no success… not a very durable solution… Therefore, we use a new double corrector. Cousinsuk’s reference: VAL77502569: Valjoux 7750 2569 Double Corrector £5.90 After replacing the new double corrector we have to assemble all the parts, just following the same steps back. Watch is repaired, as the following video shows: Share this post Link to post Share on other sites
juju38 0 Posted March 19, 2011 very instructive post Share this post Link to post Share on other sites
Wiz 0 Posted March 19, 2011 Thanks a lot for putting this together, I'm sure it will save me some watchsmith expenses in the future Share this post Link to post Share on other sites
tissotman 0 Posted March 22, 2011 A very good topic as ive had i few problems with similar watches. Share this post Link to post Share on other sites
MikeMcNair 0 Posted March 31, 2011 how doe one get a hold of this "fransisco" person? i have an A7750 i need fixed and i cannot do it myself. i would LOVE to send it to this guy. Share this post Link to post Share on other sites
KBH 7 Posted March 31, 2011 Francisco, is mostly on RG and RWGjr. But he's in Spain so I'm sure you could find someone closer. Share this post Link to post Share on other sites
onzenuub 307 Posted March 31, 2011 how doe one get a hold of this "fransisco" person? i have an A7750 i need fixed and i cannot do it myself. i would LOVE to send it to this guy. For the next 10 days he is on a vacation. Share this post Link to post Share on other sites
GenTLe 1,501 Posted August 4, 2014 I've the exact same problem on a brand new IWC 3717. Is there a way to understand in advance (before to unassemble the watch) if the problem is at keyless or at double corrector level? I'd like to order the part in advance and not leaving the watch unassebled for a week or so while waiting for the piece. Thanks GenTLe Share this post Link to post Share on other sites