How to Repair a Seiko 7s26 Automatic Movement

[at2011]

Hi Guys,


Just want to share this very cool link for the novice DIYers... How to Repair a Seiko 7s26 Automatic Movement.

Please enjoy!
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For Chapter 4.2 tutorial link, please click here

[Time]

Thanks for sharing!

[pollyc]

I wanted to reply sooner but after reading the article I was late for work!


Thanks for the heads up for the link, its a thorough tutorial and will be helpful as I am due to service a 7S26 soon.


Mike

[DAHASCO]

Hi Guys,


Just want to share this very cool link for the novice DIYers... How to Repair a Seiko 7s26 Automatic Movement.

Please enjoy!

    I am sure our Members will find this very helpful. 

[vek]

mucho thanks for posting the link. I have a 7s26 that I wanted to try to service,this should give me the push to lose my virginity with !! 

[at2011]

Please check original post for Chapter 4.2 link - Technical Guide and Parts Catalogue for Cal NH 25/26

[Adriano]

Don't forget the finger cots. That's important.

Best regards,

Adriano

[ggray830]

Thanks for the heads up. That looks like a great resource for anyone looking to service their 7s26. I've bought replacement movements in the past because it was cheaper than paying for a service, and I had no idea how to do it on my own. I guess now that's something to consider.

[Spencer PK]

what's great about this article is that it has a very clear step-by-step on how to clean a mainspring.  Good stuff.

[BenchGuy]

Couple the 7s26 link with the technique demonstrated in this video of a 3135 reasembly, and you have a lot of watchmaking in a small package...very useful information.  Link:  http://hiro.alliancehorlogere.com/en/Under_the_Loupe/Rolex_3135.

[DAHASCO]

Couple the 7s26 link with the technique demonstrated in this video of a 3135 reasembly, and you have a lot of watchmaking in a small package...very useful information.  Link:  http://hiro.alliancehorlogere.com/en/Under_the_Loupe/Rolex_3135.

Thanks Benchguy, Great vid with my morning coffee 

[StartSomething]

Great read, very interesting, thanks for sharing!
 
 
 
Is this an ongoing project? I wish the complete reassembly including hand-setting would be discussed as well :-)
 
Best,
Hermann

[Men]

Great!


Thanks for sharing.


Men

[scubarob99]

Before we pop the caseback off ,I assume the watch is not running.( do we just not wear it for a couple of days?) also ,is there a way to make sure it does not re-start in the middle of the dis-assembly ? rookie questions, I know, but I am new to the caseback opening phase of my new found obsession, and my palms are a bit sweaty , just trying to cover all the angles.
Rob.

[BenchGuy]

Remove the autoweight screw and autoweight.  Do not attempt to remove the first reduction wheel.  Loosen the second reduction wheel screw leaving two or three threads engaged (this is a left-hand screw).  Gently disengage the pawls from the second reduction wheel (to remove the tension).  Now you can unscrew the 2nd reduction wheel screw and remove (without launching) the second reduction wheel.  The attached image shows the rachet screw and ratchet removed.  DON'T DO THIS BEFORE LETTING THE POWER DOWN!  To let the power down, use a screwdriver in the rachet wheel screw to turn slightly CW and at the same time disengage the spring click, then let the screwdriver be turned by the mainspring controling the let down rate with finger pressure.  Once the power is let down, you can remove the rachet screw & ratchet wheel.  See attached.  Wear eye protection (in case you get it wrong).  Kneepads and magnets are watchmaking tools, too.