Seiko 7A38 DAY wheel not functioning, but date wheel is fine? - Seiko & Citizen Watch Forum Japanese Watch Reviews, Discussion & Trading
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Old 10-29-2019, 06:54 PM   #1 (permalink)
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Default Seiko 7A38 DAY wheel not functioning, but date wheel is fine?

I'm hoping I didn't royally mess up my watch but I don't know what else to try. I was going to try out some new hands on my 7A38-7270 that I ordered from Cousins. The new hands didn't want to go on which I was anticipating as I'd read on another thread that they weren't exact matches even though the measurements were correct. So without trying to force it, I cut my losses and put the original hands back on without issue. Everything was working or so I thought. Looked down at the watch this morning and the day still read Monday (today is Tuesday) but the date had changed to the 29th. I tried doing the quick set for the day but all I got was a very faint feeling click. Not the strong and audible click that you normally hear/feel when doing the quick set for the day.

I have never taken the face plate off before so obviously haven't messed with either of the day/date wheels. I went in there a little while ago, but nothing seemed out of the ordinary compared to pics online and a youtube video I was watching. But even with everything disassembled, the day wheel still wouldn't turn by just using the crown. It did turn if I used a piece of rodico to manually spin the wheel and I could feel the gears also moving.

I don't know what else to try. I took some pictures while I was inside so if anyone spots something that I overlooked, please let me know. Could this be an issue with the crown? With everything reassembled now, trying the quick set for the day I can barely feel any kind of resistance and a very faint 'pull' of the gears moving. But doing the quick set for the date works fine. Please help guys!




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Old 10-30-2019, 05:58 AM   #2 (permalink)
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Where is your brass day wheel clip? Also make sure the jumper spring is correctly engaging with the teeth on the day wheel. If so then install the snap for day disk/brass circular clip.
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Old 10-30-2019, 06:11 AM   #3 (permalink)
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The weak link (read Achilles Heel) of the 7A38 movement is the plastic day / date changeover wheel - which is hidden in your first two photos underneath the upturned day star.





The lever arms and teeth can become brittle with age. Have you checked whether it is damaged ?

Last edited by Dazzler; 10-30-2019 at 06:14 AM.
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Old 10-30-2019, 06:25 AM   #4 (permalink)
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Quote:
Originally Posted by zeldar View Post
I'm hoping I didn't royally mess up my watch but I don't know what else to try.
I was going to try out some new hands on my 7A38-7270 that I ordered from Cousins.

That is the movement from a 7A38-7270 ? Why has it got a gold lettered date wheel (instead of white on black) ?

AFAIK, the only 7A38 which used black / gold day / date wheels is the gunmetal two-tone 7A38-6090 SAA117J .


Last edited by Dazzler; 10-30-2019 at 06:30 AM.
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Old 10-30-2019, 10:59 AM   #5 (permalink)
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GuyJ- Sorry, yeah the little c shape clip is there, just not in the pictures. It snaps in as it should. Are you referring to that little finger (GoT anyone? lol) which actually makes the clicking sound on the day wheel? If so, yes, it is engaged. After fiddling with it for over an hour I finally noticed that the day wheel was sitting on top of it. When I figured out that needed to be on the gear I got all excited thinking I had fixed it. Nope...

Oh, and this morning the date didn't change either. I can still manually change the date but not the day. I'm guessing that black change over gear might not be installed correctly after I took it apart yesterday.

Last edited by zeldar; 10-30-2019 at 11:07 AM.
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Old 10-30-2019, 11:06 AM   #6 (permalink)
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Dazzler- I don't know why I didn't take a picture of the changeover wheel as that was the first thing I checked when I got in there. I had read about it being the weak link but it looked to be in great shape. No damaged teeth and the changeover fingers looked good. I'll probably get back in there later today and will post more pictures. Maybe yall that have way more experience than I do will notice something.

haha yeah I did notice the gold numbering on my 7270 wheels but actually really liked it since it matched the bling Seiko logo. The day wheel is matching with gold lettering. I didn't know there was only one model that used them though! I have three 7A38s and this is my play around watch. The other 2 are all stock.
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Old 10-30-2019, 11:54 AM   #7 (permalink)
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Quote:
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haha yeah I did notice the gold numbering on my 7270 wheels but actually really liked it since it matched the bling Seiko logo.
So apart from the non-standard gold-lettered day / date wheels, what does your 7A38-7270 look like ? Anything like this ?

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Old 10-30-2019, 01:16 PM   #8 (permalink)
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Well spotted Guru Paul.
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Old 10-30-2019, 04:51 PM   #9 (permalink)
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Originally Posted by Dazzler View Post
So apart from the non-standard gold-lettered day / date wheels, what does your 7A38-7270 look like ? Anything like this ?
For the most part, yes it looks like yours but not in near as good of shape. Here are some more pictures of inside. I really don't know what else it could be that is not making the day wheel move. The day wheel might be faulty, but that doesn't explain why it worked fine 2 days ago before I opened it up. I don't suppose anyone might have a source for a replacement wheel? Regardless of text color





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Old 11-01-2019, 08:59 AM   #10 (permalink)
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I would put it all together up to the point you would normally put the dial on. Put stem in and test by winding forward and quick set. You might find it works. Make sure you seat the day disc properly and check it is flat. Good Luck.
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Old 11-01-2019, 09:48 AM   #11 (permalink)
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You have some damaged teeth there:
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Old 11-01-2019, 09:51 AM   #12 (permalink)
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Is the advance finger going over the top of the tooth on the day wheel (finger worn on the underside) ??? Definetly check all plates/bridges/wheels are flat. Edit: I see Noah has you figured out.
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Old 11-01-2019, 10:20 AM   #13 (permalink)
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Thanks guys! I did notice the teeth being a little damaged on the changeover wheel but didn't mention it because I spent a good 15min manually winding the watch and that had no issue.

I do have my problem worked out but now kinda screwed as I need parts for a watch made in the 80s! The changeover wheel finger was going over the date wheel which is why it wasn't turning over the new date. Got that issue fixed pretty easily.

My day wheel is ruined. I got frustrated and decided to remove the star from the day wheel so I could actually see whats going on under there. What is happening is the star and gear that drives it are jamming. See picture:

I broke out a razor and cleaned up the star really well and put it back on and boom! it spun flawlessly. All right, just gotta put the day wheel back on the star and I'm good to go! If only the wheel would just go back on the damn star... It wouldn't and I pushed it too hard and got the wheel all bent. In the meantime as I tried over and over to just test that the gears played nice together, the brass c clip went flying across the room on one attempt. Spent an hour on the hands and knees looking for it to no avail. So now I need a star with date wheel, c-clip, and might as well replace the changeover wheel while I'm at it. See the WTB section of the forum... haha
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Old 11-01-2019, 10:38 AM   #14 (permalink)
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You need a brass magnet 😀
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Old 11-01-2019, 11:07 AM   #15 (permalink)
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haha seriously! I even vacuumed the entire room hoping I would find it in the tray. It is driving me mad! I'm sure it fell in the perfect spot where I'll find it when I'm 50 years old.

Last edited by zeldar; 11-01-2019 at 11:09 AM.
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Old 11-01-2019, 11:09 AM   #16 (permalink)
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haha seriously! I even vacuumed the entire room hoping I would find it in the tray. It is driving me mad!
Place a piece of linen over the vacuum hose and the parts will be visible on the linen (If they are in the vicinity )
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Old 11-01-2019, 05:58 PM   #17 (permalink)
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Quote:
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Place a piece of linen over the vacuum hose and the parts will be visible on the linen (If they are in the vicinity )







That's a great tip
One which I will use.
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Old 11-01-2019, 06:37 PM   #18 (permalink)
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My kitchen floor has a hidden corner that has shepherds crook springs (it loves those), the odd c-clip, diafix springs, even a few screws and some of those were relatively huge! I've spent more time on my hands and knees in the kitchen than a sex-addicted chef. We've all been there ;o)
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Old 11-01-2019, 06:44 PM   #19 (permalink)
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I think it was Noah who said the floor is the Big Bench

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Old 11-01-2019, 06:52 PM   #20 (permalink)
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haha problem is, these parts are next to impossible to find! Guess I just refresh ebay for all eternity and hope for the best.
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Old 11-03-2019, 06:53 PM   #21 (permalink)
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Buy a SCRAPPER.
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