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Help! My HW100KT Is Leaking Air

Discussion in 'Anything Airgun Related' started by Tan, Feb 15, 2014.

  1. Tan

    Tan Donator

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    Hello.

    When I fill it, within in 10-15 minutes, the air pretty much drops completely. What could be wrong?

    T.
     
  2. gasman

    gasman Up a bit,,,,,,,

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    can you here where its coming from tan?
     
  3. Snipertez

    Snipertez Donator

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    Is it a standard kt ?

    Has the cylinder been removed and re-fitted recently ?
     
  4. Tan

    Tan Donator

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    I don't know if the cylinder has been removed or refitted, but that's where it's coming from...

    T.
     
  5. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    First thing to do is to remove the stock. On the underside of the action you'll see three (I think) holes; the front-most one is untapped and is the vent hole from the cylinder mount - this is where the air vents when you unscrew the cylinder and it's housing becomes momentarilty pressurised.

    With the pressurised cylinder fitted and the action turned upside down, put a few drops of oil over this hole - if air is escaping from it (the oil will bubble) the bottle to rifle O-ring needs replacing (the small one on the end of the brass assy on the rifle, onto which the bottle screws).

    If the leak isn't here it could either be deeper in the rifle, or on the cylinder. Remove and fill the cylinder; leaving it of the gun. If it still depressurises the fault is on the cylinder, if it holds it's pressure, the fault is on the gun.

    While very easy to work on the '100 has a lot of seals and I don't have the time to go through them all.. the info above should get you started though. I trust it's not longer under warranty..? If it was, replacing the bottle to gun seal is as far as I'd recommend going before sending it back to the factory..
     
  6. kermitboy1

    kermitboy1 Banned

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    If the cylinder has been off recently, its very easy for the seal washer to be damaged or torn if done up to hard. KB1
     
  7. Tan

    Tan Donator

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    It was bought second hand, so no warranty. I'll have a go based on what you've said above. Thank you.

    T.
     
  8. Steve K

    Steve K Posting Addict

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    Couple of things to check, could be the fill port in the cylinder, there's a tiny valve in there, they get dirty and sometimes jam, let out some air or wait till the pressure is about 150 BAR, then insert the probe into the fill port.
    Give a couple of quick hard blasts of air, this usually frees the valve and allows it to seal properly.

    Another place to check for a leak is in the breech, the O rings in there get squashed on assembly and can leak, hopefully it's just the cylinder seal O ring ;)
     

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