Service Bucherer chronograph / Landeron 248

IMG_4066Barry was brave enough to allow me to service his nice Bucherer, as this is my first customer chronograph. IMG_4068The movement is in excellent shape but bone dry and in need of a service.IMG_4069I start by taking the movement out of the caseIMG_4070Then I remove the hands.IMG_4072The dial side of the base plate is simple enough, as the movement doesn’t have an hour recorder.IMG_4078The movement looks a little daunting so before winding down I have a long look at what the different parts do.IMG_4076I take photos in every angle so to see how it is put back together.

IMG_4078I start dismantling the chronograph.IMG_4082Here I have removed the minute recorder and the central chronograph runner.IMG_4083I remove the tension springs before removing the various leversIMG_4089Slowly but surly I get to the base movement.IMG_4093Base movement is easy enough as everything is in great shape.IMG_4101Old mainspringIMG_4102All the parts look clean and nice.IMG_4184New mainspringIMG_4093Base movement back togetherIMG_4190Great amplitudeIMG_4191Somehow the parts find their way back into the movement 😉IMG_4193I take great care not to loose any of the wire springs. Working from the photos, I put all the components and their screws back onto the plate.

The movement is back together and depthing correctly adjusted with Christian’s help.

IMG_4208Is also a challenge to aligning the minute recorder and second hand correctly when putting the hands back on.IMG_4209Movement back in the caseIMG_4210I really enjoyed working on this nice watch and I’m looking forward to my next chronograph;)

15 thoughts on “Service Bucherer chronograph / Landeron 248

  1. Taking things apart and putting them back together is what grandma called (solving puzzles). Most of those puzzles were either 500 or 1000 pieces. Grandma never missed. In regards to the back end of watches, you are a watch mechanic, or a watchmaker. If you can (on paper) submit a working watch movement, you have the potential to become a watchmaker, provided you have the 27,000 dollars worth of equipment. If not, your Grammy had it right.

    • Not quite right. The challenge isn’t to put a movement back together. That’s easy. It’s about making sure each component works as it should, and spotting if something isn’t quite right, and knowing how to make it right. Putting the right part in the right place isn’t really a problem. As with anything, it takes about 10000 hours of practice to get there.

  2. Hello!

    I’d like to ask a technical question, if I may: do you oil the shouldered “safety” screws that hold in place the coupling clutch 8080, the sliding gear 8100 or the hammer 8219? If so, do you also put a very tiny drop of hp 1300 under them?

    Thank you!

  3. Lovely watch. The first chronograph I worked on was a Landeron Cal. 48 in a Leonidas watch. I too was a little daunted but I’ve found that all the chronographs I’ve worked on use the same basic principles. Perhaps I’ve not had enough experience yet!

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