How to change a date wheel on Seiko NH series movements

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A quick tutorial video on how to change the date wheel on the Seiko NH series movements. The movement in the video is an NH34. I made this look much more difficult than it really is lol. I shouldn't have picked it up, but at least you get to see some extra steps. You even get to see some trouble shooting. Really simple task, you can do it!

[@AS-tc]

you have no idea how much i needed THIS particular video. I have now ruined 4 NH34s doing this! IDK I was following a NH36 video. TBH same process but i was just messing it up. This video is making me wana try again tho!

[@dadmodswatches]

Do it!! Take pics of all the steps to make sure you put it all back the right way. You got this!!

[@TugboatBillSimpson]

First off, thanks for the video. I did find it helpful.
Second, this took me two hours to SUCCESSFULLY complete. The most sensitive thing ever. The parts weigh 10 atoms each and it's near impossible to move the top metal sheet into position without violently bumping the bottom sheet that has to absolutely be still so the tooth stays in place. OMG what a good time though...

[@dadmodswatches]

I am happy it helped! It's a "don't sneeze'" kind of project for sure!

[@Coreyreesephotography]

Hello, my watch originally came with an NH05b movement that includes a date function, but it stopped working. I bought a new NH05b movement as a replacement, but I noticed that the date wheel on the new movement is smaller and doesn’t match the original. Since the new movement's date wheel doesn't fit, is it possible to remove the smaller date wheel from the new movement and replace it with the larger original date wheel from the old movement?

[@dadmodswatches]

From the research I did, it looks like you should be ok. It seems they did change the part number though

[@Coreyreesephotography]

@@dadmodswatches thanks!

[@gabrielwong1833]

Haven't played around with an NH34 but i am saving this video for the future!!
Great instructional video (even with the date wheel tryna make a run for it haha)
Liked and subscribed - looking forward to more awesome builds!!

[@dadmodswatches]

Glad it was helpful!

[@tattoofthesunn795]

great video and great commentary-- loved it, doing this for my new miyota and a dial i live but which came w a different date window position

[@dadmodswatches]

Glad it was helpful!

[@dhmy2kgto]

Do these date wheels fit onto a R movement as well? Great videos, please keep them coming!

[@dadmodswatches]

Yes they do, they are exactly the same

[@dhmy2kgto]

@@dadmodswatches Thank you for the tip! I have a pet peeve with non-matching date wheels to the dials, haha

[@Slayer-lv4sf]

Hi there, nice toturial btw, keep it up. Just a quick question, does any nh35 date wheel found on aliexpress work fine for a 4.1 crown nh35? I have a nonlumed date wheel and want to swap it with a lumed one, cheers man.

[@dadmodswatches]

Thank you, and great question! To my knowledge, you should be fine with any date wheel for an NH35. It's the day wheel on the NH36 that causes alignment issues when changing crown position.

[@primatefurtif6367]

Hi ! Thank you for the tutorial, very clear, especially since nobody made one for the NH34. I have one question : I'm modding a SRPE case with crown at 4, a NH34 and a dial with date at 3. Is it necessary to change the date wheel ? Best regards !!

[@dadmodswatches]

Thank you! Yes you should be ok. Date wheel only movements are good for multiple crown positions. NH36 day/date is where you run into alignment issues. Thanks for watching! Cheers!

[@primatefurtif6367]

@@dadmodswatches Thank you very much !! :)

[@cookie7823]

What size of screwdriver are you using, ti chabge the date wheels ? Soz im still new to watch moddings

[@dadmodswatches]

I use 1mm

[@ChrisRogersTheAngryChef]

I'm looking to do this on an NH34, are date wheels from an NH35 or 36 interchangeable?

[@dadmodswatches]

Yes they are

[@nicholasenciso6777]

Thank you

[@dadmodswatches]

You're welcome👍