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629 Trigger Problem

Discussion in 'Gunsmithing and Repairs' started by 56hawk, Jan 8, 2013.

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  1. 56hawk

    56hawk Member

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    I have a 629 Mountain Gun that recently developed a problem. When cocked into single action, if the trigger is pulled lightly the hammer will decock instead of firing the gun. A heavy pull to the trigger, and of course double action always works.

    Tried swapping out the mainspring and the rebound spring, but it didn't make any difference. Any ideas?
     
  2. rcmodel

    rcmodel Member in memoriam

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    Worn hammer notch or SA sear.

    Try the push-off test on a cocked SA hammer.

    Apply pressure on the cocked hammer spur, and if it slips off cock, the hammer or sear is worn beyond repair.

    Put the original springs back in it.
    And send it back to S&W for proper inspection & repair.

    rc
     
  3. 56hawk

    56hawk Member

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    Thanks, it failed that test. This gun was made back in the 80's, so if I decide to fix it I don't think I will bother sending it to S&W.
     
  4. loose noose

    loose noose Member

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    You might try filing the sear just a bit, so that it will engage. I had that same problem with my S&W Model 29, and it worked fine. lol
     
  5. rcmodel

    rcmodel Member in memoriam

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    S&W hammers & sears were made of soft steel and case hardened back then.

    If it's worn through the case hardened surface already?
    Filing on it is just going to make it wear out faster.

    rc
     
  6. Jim K

    Jim K Member

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    Those hammers and/or triggers very rarely wear out from use and it takes a lot of use. 99.9999% of the time, they go bad from having been worked on by people trying to improve the trigger pull.

    You will most likely have to replace the hammer or trigger or both. I would return the gun to S&W. They will probably not replace the parts free under warranty, but they will do a better job of getting things right than many gunsmiths.

    Jim
     
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