Some Questions on a Waltham Grade 636

Discussion in 'Watch Repair' started by ANDY YALE, Apr 1, 2017.

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  1. ANDY YALE

    ANDY YALE Registered User

    Jun 14, 2013
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    This is a model 1908 that has some features that are new to me. First motor barrel I have worked on, but it was easy to figure out once I recognized what it was.
    However, I'm curious about this screw on the underside of the train bridge which apparently holds the escape wheel upper jewel setting in place. Not seen one before.
    Also would like to know if these two pieces are assembled together and put into the watch as a unit. The came out that way. The bottom piece that holds the castle gear and it's shaft is a mighty tight fit into the plate. I'm one step ahead of myself but forearmed is forewarned. [​IMG][​IMG]
     
  2. Mark UK

    Mark UK Registered User

    Apr 13, 2015
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    Andy, I am going through a learning curve right now with the 1908 as well having just serviced half-dozen grade 635 and up. For the winding shaft (second pic) I have found that it is easier to assemble/lube as a complete unit then pop it onto the main dial plate. I then put the barrel bridge temporarily in place to hold the shaft in position so I can turn the movement over and screw on the small disc that covers the idler gear and holds the shaft in position.

    As for the escape wheel jewel, is it a capped jewel setting? I would be be surprised to find one of those as well, especially on a 17J.
     
  3. Dave Coatsworth

    Dave Coatsworth Super Moderator

    Feb 11, 2005
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    That should be a capped jewel. When you remove the retainer, both the hole and cap jewel will come out in that direction.
     
  4. ANDY YALE

    ANDY YALE Registered User

    Jun 14, 2013
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    Yes, the jewel setting is different than the others - it has a high profile setting. Thanks, guys.
     
  5. ANDY YALE

    ANDY YALE Registered User

    Jun 14, 2013
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    Actually, that jewel is not capped. It's a single jewel, a hole jewel with a raised jewel setting. I guess it's screwed in from the bottom because the setting is too high to allow for screws on the top side.
     
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