Seiko 7S26 Watch Service. Assembly Tutorial Part 1 Motion Works

In this video I demonstrate how to assemble a Seiko 7S26 watch movement as part of my Seiko 7S26 watch service series. This movement is commonly found in the iconic Seiko SKX watches. I will take you through each part placement step by step and where to oil when necessary to do so as part of the watch service. This is part one which will cover the motion works side of the movement.

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[MyRetroWatches]

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[nunyabusiness]

Brilliant video. Attemping my first assembly/dissassembly and then service soon. I cannot thank you enough for those closeups of the oiling.

[adrianbirkett]

Well done!, and no cursing or swearing!!!!. Good role model👍. Adrian🍀🍀

[dodgydruid]

All been going on here at Watson Towers lol Picked up a 1955 Roamer, serviced too and a Tissot Seastar 2030 quartz for a ridiculous cheap price but needs a stem and crystal, paid a tenner for the Roamer and its on a really unusual rally bracelet :) Spotted I hadn't given this vid a watch so going to sit back with my cup o' tea and enjoy :D

[olejohanpalsrud]

Great video, but I notised that you put the one wheel in the clutch the wrong way, the brass one. I've also done that a few times. Exept from that,  great work.

[andrewdeweerd]

Thanks! I took apart my Seiko divers watch when the second hand fell off. After pushing it back on, watch ceased running. Agh.


I removed the movement and noted that the fingers on the escape wheel were not engaging the jewels on the pallet fork. I'm guessing (?) that I had put too much pressure on the cannon pinion when pushing the second hand on, which then flexed the bridge that captures the escapement pinion, and the escapement "escaped" its seating.


So, I decided to disassemble the whole thing and clean. As usual, my exuberance in reducing a machine to its elements was directly followed by the discovery that the reverse operation was far more difficult. Your video made it easy though. I'm watching the balance wheel oscillating happily at this very moment. I've just ordered a timeographer and will get it beating properly before finishing the day/date assembly.


You're a very good instructor with just the right touch of humor, self-deprecation, and demonstrable competence in the subject. Subscribed!!!

[GenWivern]

Splendid - thanks again Mike. You remarked before about the workaday sort of finish on these movements, and that's fair comment, but watching the re-assembly reinforced my impression that the design is really quite elegant. Relatively repairer friendly too.
Off topic: I find myself in need of a bigger movement holder. This is what comes of having your head turned by pocket watches ... I'm tempted to stick it in the lathe chuck. :-/

[gtcih]

Hi Mike. Thank you very very much for your videos.

[SriramVad]

I just bought an snxs77k ( the same movement. ) But it didn't work no matter how much I shook it ... So I gave it two firm whacks on the back and it started to work. But now it's running 16 mins fast everyday and I'm having to set the time daily. This video can definitely help me with that. Thank you so much.

[-Dash-]

Nice. Looking forward to the next part.

[BillMrWild]

Nice one Mike, hey that main spring was well gungy look forward to the next one. Thanks for posting.

Hi! I not speak, about the watch, is a common moviment.But your work with the camera, the style to speak, and the post edition, is the best I saw in all WWW.THANK YOU!!!!
I a watchservice, but only work with SEIKO vintage, Till this movement, And a collector too, I have, almost, one watch for each movement.
Regards
Marcelo

[scdevon]

Nice work! My main attraction to Seiko is how plentiful parts are for them. With Swiss brands, good luck getting even new packaged ETA parts anymore unless you have a "parts account".
In-house movement parts for Swiss brands since 2015? Forget it unless you want to constantly buy parts movements. Japanese is the way to go.

[a.aguilar]

Good work! You really amazed me installing the balance, I'm not close at all to your skill in that area. I need to improve that.

[ianmargetts]

Ahh great vid bro, you make it look easy....!

[nemesG]

Hi Mike. I think you might have got the little star gear on the stem on the wrong way around. The plain collar should be facing out with the little studded side facing in and engaging the little studs on the non gear side of the clutch. I think 🤔. Maybe? Just looking at your disassembly video for reference on the position and I think its the other way around

[dannyclayton]

Great video, what size is the cross headed screw driver to remove the Callander cover please.

[WhoTFstolemyname]

I realize this is an old one but I've been working through your old videos. Great info and much appreciated as a tool for a hobbyist! How do you keep the screws straight when cleaning, etc.? Are there generally only a few sizes? My current thought is to just use extra washing baskets and try and separate as much as possible, but is there a better method?

[soumitrahazra]

On my Seiko Watch ratchet wheel looks like scratch, is it possible ?

[crumbums]

How do you remember where all the parts go back