Kind of a problem when the pinion snaps off - Seiko & Citizen Watch Forum Ė Japanese Watch Reviews, Discussion & Trading
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Old 10-17-2019, 08:03 PM   #1 (permalink)
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Default Kind of a problem when the pinion snaps off

Buddy gave me a watch to look at a while back. Day change over wasnít working. It has a NH36 so I immediately figured a plastic tooth had snapped off. Opened the watch and sure enough after tearing down the dial side a tooth was missing off the day corrector.



No spares on hand I ordered a replacement movít simply to expedite things

Now, about a year later I figured Iíd service the old movít to use in a different project. Started tearing it down and noticed how sloppy the pinion stack was. I sort of recalled that from when I originally looked at the watch which is probably what led me to replace the movít. Took off the hour wheel and the cannon pinion came with it. Hereís what I found. The watch showed no obvious signs of impact. Guess I have a parts donor movít now.






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Old 10-17-2019, 08:44 PM   #2 (permalink)
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New center wheel and cannon pinion? Never seen anything like that before.
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Old 10-17-2019, 09:00 PM   #3 (permalink)
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Default Kind of a problem when the pinion snaps off

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New center wheel and cannon pinion? Never seen anything like that before.


Yeah, if I can track the parts down Iíll just service it and thatíll be that, so long as nothing else is damaged. Quick look earlier I couldnít turn anything up, but hadnít tried hard yet to find them.

Itís that weird situation where the movít is so cheap itís not economically sound to buy parts for it, but I hate having non functioning movíts around.




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Old 10-17-2019, 09:15 PM   #4 (permalink)
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I'd be surprised if 7S parts didn't fit. More likely to have spares too.
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Old 10-17-2019, 09:20 PM   #5 (permalink)
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Default Kind of a problem when the pinion snaps off

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I'd be surprised if 7S parts didn't fit. More likely to have spares too.


Different part number. Cousins lists the NH3x parts as obsolete and unavailable. I have a 7S26a I can check but I think the pinion heights are different at minimum.


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Old 10-18-2019, 12:14 AM   #6 (permalink)
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I've never seen that happen either



I could imagine if the glass took a bad knock that broke both it and through to the cp this could happen but.....!!
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Old 10-18-2019, 08:19 AM   #7 (permalink)
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That happened to me just the other day on a 6139. Only when I took the centre wheel off, I noticed it was short. Weird that it happened on a NH36 though.

A new movement will probably cost as much as replacement parts or even a donor movement.
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Old 10-18-2019, 11:50 AM   #8 (permalink)
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Quote:
Originally Posted by Kue View Post
That happened to me just the other day on a 6139. Only when I took the centre wheel off, I noticed it was short. Weird that it happened on a NH36 though.
I hadnít experienced it before other than on really corroded scrap movíts that I wound up chucking. When I googled I only turned up one hit of it happening to an NH and it had be dropped.

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A new movement will probably cost as much as replacement parts or even a donor movement.

Yeah, Iím not going out of my way to find parts when a new movít is in the $40 to $50 range




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Old 10-18-2019, 02:07 PM   #9 (permalink)
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The centre wheel is the same as the 7SxxC and 4R15/16, so the cannon pinion and hour wheel should work, depending on case headroom ( as you said). Theres a combined centre whl and pinion part number given in one 4R3x tech pdf - and separate part numbers are given in another, so it gets confusing. Good luck.
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Old 10-18-2019, 03:58 PM   #10 (permalink)
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I can send them if you're in need Michael.
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Old 10-18-2019, 07:41 PM   #11 (permalink)
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Default Kind of a problem when the pinion snaps off

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Originally Posted by 7s26b View Post
The centre wheel is the same as the 7SxxC and 4R15/16, so the cannon pinion and hour wheel should work, depending on case headroom ( as you said). Theres a combined centre whl and pinion part number given in one 4R3x tech pdf - and separate part numbers are given in another, so it gets confusing. Good luck.


Seiko lists the center wheel and cannon pinion with separate part numbers for the 7S26C. For the NH3x movít they list the center wheel and cannon pinion together as one part number. Are you sure they are the same or comparable parts?


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Last edited by meanoldmanning; 10-19-2019 at 12:55 PM.
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