Hack Spring Adjustment
 
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Thread: Hack Spring Adjustment

  1. #1
    WTF Veteran Time2Fish's Avatar
    (Retired Engineer. Pratt Whitney Aircraft)

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    Default Hack Spring Adjustment

    I have an Astro that is acting up on me. It will run great for a day or so and then stop and restart with a light tap. Also, twice it has stopped while sitting on my desk but again it will restart when given a light tap My thinking is that the hack spring is not adjusted properly. I have not adjusted many watches with hack springs so I came up with my own method, which is perhaps not a good one. When the watch is fully assembled without the dial, I install a battery in the pillar plate. I loosen the 2 screws slightly on the hack spring and move the spring so the watch stops humming. I then tighten the two screws. After that, I p[ress in a hack plug and if the watch is humming again, I put the dial and hands on and case the movement. Once the movement is in the case I test the watch to make sure the second hand does not move when the crown C ring is lifted. Even though the second hand does not move, I do hear a whirling sound. Maybe I am not suppose to hear that? Comments will be appreciated.

  2. #2
    WTF Full Member Chris Radek's Avatar


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  3. #3
    WTF Full Member Chris Radek's Avatar


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    Well that's useful! Thanks, forum software!

    If you want a readable version of this, drop me an email.

  4. #4
    WTF Veteran Time2Fish's Avatar
    (Retired Engineer. Pratt Whitney Aircraft)

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    Quote Originally Posted by Chris Radek View Post
    Well that's useful! Thanks, forum software!

    If you want a readable version of this, drop me an email.
    I actually have a copy of that procedure. When you pull the C part of the crown out, is the watch suppose to make a noise or is it suppose to stop and be silent?

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