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Can't get this hour wheel off

VWatchie
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VWatchie Distinguished Member

VWatchie

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This hour wheel (and center wheel) belongs to a Tissot calibre 781. When I try to lift off the hour wheel it moves about a millimetre but then it is stuck. I haven't used a lot of force as I'm worried I might break something. Usually I remove the dial train/motions works at an early stage but as the hour wheel was stuck I decided to dismantle the rest of the movement in hope of discovering what's keeping the hour wheel from releasing. The movement is now completely dismantled. All that's remaining is the hour wheel, minute wheel, center wheel, and the cannon pinion. However, no luck, so like the hour wheel I'm stuck.

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Graziano WRT Addict

Graziano

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Hi there Vwatchie don't you hate that, do you have a jeweling press if so work away with have to keep the plate level and stable, leaving enough room for the center wheel , then press the center wheel out through the cannon pinion gently .This way you wont damage your hour wheel or center wheel ,there is nowhere to grab the hour wheel .Then maybe you will have the hour wheel stuck to the cannon pinion which can be removed with your stacking set .This has worked for me .Great photos by the way

Edited by Graziano
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oldhippy Distinguished Member

oldhippy

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If you mean the hour wheel it should just lift off. I would run some oil between the hour and cannon pinion which it is over and if you have a watchmakers pin vice that will fit over the hour wheel and try to remove it that way.  

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Nucejoe Distinguished Member

Nucejoe

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You got a center tube thats attached to the center wheel, I wonder if you have pushed on canon pinion and expect center tube/wheel to come out? 

If you keep the hour wheel from turning whilst turning the center wheel, you will see they are not rusted or anything causing them stick together. A bit of penetrating oil might do some good too.

Regs

Joe

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VWatchie Distinguished Member

VWatchie

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Before doing anything else, I tried to lift the hour wheel one last time applying just slightly more force (w/o being abusive) than I had done previously, and off it came and nothing was damaged. Don't know what was binding and I didn't investigate. Anyway, if it's still binding during assembly (after having been cleaned and lubricated) I'll look into it again.

Thanks for your support!

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ifibrin Super WRT Addict

ifibrin

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17 minutes ago, VWatchie said:

Before doing anything else, I tried to lift the hour wheel one last time applying just slightly more force (w/o being abusive) than I had done previously, and off it came and nothing was damaged. Don't know what was binding and I didn't investigate. Anyway, if it's still binding during assembly (after having been cleaned and lubricated) I'll look into it again.

Thanks for your support!

Did you use any special tools or just tweezers?

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      Unfortunately I'm not that lucky. I started on the train side and after I noticed the binding I pulled everything out except the driving wheel to rule everything else out. It still binds. I'm going to double check that the pinion is fully seated on the staff first, then if no joy I'll push the bridge jewel up a fraction of a mm. Fingers crossed!
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      By GuyMontag · Posted

      I have that French tech sheet too, it is a little different than the English one (eg, it doesn't have the auto works diagram). BTW, it looks like you are looking up the case number in the 1979 ABC supplement. The 1974 ABC catalog does have the 3093 case. As you determined it takes the 1222-5 crystal.  When I serviced my President 'A' (which also takes that crystal), I was able to fit a 29.8 crystal from my DPA crystal assortment. Those are, in my opinion, a great deal. The assortment comes with 10 sizes each from 27.8mm to 32.4mm in 0.2 increments. I pretty much use them for any non-armored crystal that takes a high dome crystal. I think they no longer make them but Cousins has still has some in stock but when I bought them they were around $40 for the set and now they are around $100. Still, at 40 cents a crystal it's still a good deal. For the large driving wheel, I remember I once assembled the keyless/motion works first and when I placed the large driving wheel it was interfering with the setting wheel on the dial side as the teeth were not fully meshing and it wouldn't fully seat. If that isn't the issue I got nothing and am looking forward to see how you solve it 🙂
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