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Thread: Hammerli Master Issue

  1. #1
    Join Date
    Jul 2008
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    Hammerli Master Issue

    So my 'new to me' Hammerli Master is a very nice and accurate pistol - but only when I can keep gas in it!

    Its all to do with the automatic release device. Sometimes when a new capsule is loaded it closes and stays shut for a shortish while, sometimes it just steadily releases gas and sometimes it just releases all the gas in one go.

    Unfortunately, I don't really understand how the valve works. The only information and parts diagrams in the public domain , on Vintage Airguns, are for an earlier pistol and the instructions don't appear to be valid for this model.

    Any knowledge on these pistols gratefully received!

    Steve

  2. #2
    Join Date
    Feb 2001
    Location
    Farmington, MI, USA
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    356
    The most likely issue is that the seal in your auto-release cap is failing - recently I replaced the crumbly seal with an O-ring and it works. It's also possible that yours is set to release far too 'early' (meaning at too high a residual pressure), leading it to release at full CO2 pressure. The VintageAirgunsGallery instructions for the auto-release cap (page 9 of link below) and its diagram (page 22) apply. Though the Master triggers and firing valves changed through the years, I've only seen one version of the auto-release cap. Note the instructions tell us to deactivate the release feature when piercing a cartridge (rotate the rear portion until it pops backward). After the gun is charged, push and turn to activate the release feature.
    https://forum.vintageairgunsgallery....ual/#post-3763

    Don R.

  3. #3
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    Quote Originally Posted by draitzer View Post
    The most likely issue is that the seal in your auto-release cap is failing - recently I replaced the crumbly seal with an O-ring and it works. It's also possible that yours is set to release far too 'early' (meaning at too high a residual pressure), leading it to release at full CO2 pressure. The VintageAirgunsGallery instructions for the auto-release cap (page 9 of link below) and its diagram (page 22) apply. Though the Master triggers and firing valves changed through the years, I've only seen one version of the auto-release cap. Note the instructions tell us to deactivate the release feature when piercing a cartridge (rotate the rear portion until it pops backward). After the gun is charged, push and turn to activate the release feature.
    https://forum.vintageairgunsgallery....ual/#post-3763

    Don R.
    Hi Don,

    Yes, I did try adjusting the screw but that didn't help. It would appear that there are two or three variants of the auto release device. This one looks externally similar to the diagram but the internals are different based around a ball valve. It doesn't turn or spring back as the instructions suggest.

  4. #4
    Join Date
    Jul 2008
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    I might just have sorted this......It suddenly dawned upon me that the auto release had been re-assembled incorrectly - the circlip had been put back on the wrong side of the screw housing. With this bit in the right place, the rear part then turned/locked as per the instructions. I also added a weak spring to hold the ball in place against the inner seal. It still leaked however until I put a stiffer spring in next to the ball and now it seems to be gas tight, fingers crossed. If it hasn't lost the gas over night, that may be job done.

  5. #5
    Join Date
    Feb 2001
    Location
    Farmington, MI, USA
    Posts
    356
    There's something to learn every day! They couldn't resist using a ball in the cap as well as the firing valve. Thanks for the photo - glad you've been able to resolve it.

    Don R.

  6. #6
    Join Date
    Jan 2009
    Location
    christchurch
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    7,138
    Quote Originally Posted by draitzer View Post
    The most likely issue is that the seal in your auto-release cap is failing - recently I replaced the crumbly seal with an O-ring and it works. It's also possible that yours is set to release far too 'early' (meaning at too high a residual pressure), leading it to release at full CO2 pressure. The VintageAirgunsGallery instructions for the auto-release cap (page 9 of link below) and its diagram (page 22) apply. Though the Master triggers and firing valves changed through the years, I've only seen one version of the auto-release cap. Note the instructions tell us to deactivate the release feature when piercing a cartridge (rotate the rear portion until it pops backward). After the gun is charged, push and turn to activate the release feature.
    https://forum.vintageairgunsgallery....ual/#post-3763

    Don R.
    Thanks for that link Don
    V useful

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