Seiko 7123A

[arkobugg]

Cheers mates!!

Im working on a Seiko 7123A, im ususally not doing quartz, they are so unpredictable I think... Or is it I dont know them good enoght.... anyway.

I have oiled all bearings, cleaned, og had to fix a little on the quick set on the date and day.

And now the quick set work, the date and day skifts when I turn th hands 24 hours.

The movment runs fine, and keeps time.

But when is shall shift date and day during the night, the movment stops around 01.30, but the second hand works.

It seems like the movment cant drag the calender work through the shift.

 

Can somebody pls help me with what the cause is??

[watchweasol]

Hi  You obiously have an issue with the day/date changer, Has the movement been dismantled and cleaned / oiled and re assembled.  What was the fix you had to do on the day/date changer mech.   I personally would remove the day/date discs and leave the gearwork intact and see what the result is if it still does the same you can discount the discs and investigate the gear work.  I have attached the seiko tech sheet for you .

7123A.pdf

[arkobugg]

I have only oiled the gear work. I had to straighten out some of the teeth in the calender wheel, but they are very worn out. And place the quick set mech right.

 I will remove the day/date discs and leave the gearwork intact and see what the result is if it still does the same..

[Melt]

I had this problem as well. I believe the cannon pinion is slipping when extra power needed at day date change.

It's not like the cannon pinion on Seiko automatics.

You need to tighten the wheel on the tube but be careful the wheel spokes are super fragile. 

This movement is also a PITA the date wheel has to be 100% flat and the teeth true or the date quick set will jam and the date will also not sit right in the window after changing.

Edited October 21, 2019 by Melt