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Advice using pcp pump

Discussion in 'Anything Airgun Related' started by seakingfixer, Jan 11, 2014.

  1. seakingfixer

    seakingfixer Engaging Member

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    I fear the worst but live in hope . charging second hand axsor for first time using new webley accupump . did pressure test on pump as per manual perfect. connect to gun and get a good sweat on however pressure gauge drops off while connected to gun . i have persisted with allowing pressure to drop off and topping and it is easier each time but never holds . have shot gun action works fine but impossible to gauge power output .Would i hear any leaks from the gun ? or is it a matter of perseverance as i do not know how long it has stood empty ? :confused:
     
  2. Truckcab79

    Truckcab79 Busy Member

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    Cock it first. Then try filling it again.
     
  3. Natgun

    Natgun Well-Known Member

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    Isn't it to do with the value being open if the cylinder on the gun is completely empty? When you cock the gun, I believe you allow the valve to close.
     
  4. terry1001

    terry1001 Major Poster

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    It sounds as though you are able to get some air into the rifle, certainly enough to fire it so you aren't trying to fill from empty. When the rifle is empty it is usually necessary to cock the action as the cylinder air pressure is what holds the valve closed. If possible it would be a good idea to get a fill using a bottle and then you would be able to check for leaks. I don't use a pump as it's too much like hard work but if you can get a first fill done then it should be simple to just keep it topped up with the pump.
    It is possible that some of the seals have suffered if the rifle has been left empty and unused but they should be simple enough to replace yourself, I am not familiar with this model of rifle but I am certain that there will be a complete strip down guide somewhere (you might search on youtube as a start) and there will be members on here who do know about the gun and can give specific advice.
    I hope you get it sorted quickly and welcome to the forum.
     
  5. ste

    ste Posting Addict

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    as stated already you will need to cock the gun, but you may need to get to a bottle and give it a burst from the bottle to sort it if you can do it with the gun cocked.

    thanks ste
     
  6. sharpsman

    sharpsman Big Poster

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    Check hose connection to the pump is tight,if the gun is holding air ok when the pump is disconnected it sounds like its something to do with the pump.
     
  7. seakingfixer

    seakingfixer Engaging Member

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    pump brand new and passes self test . no leaks detectable at connection points using soapy water . can achieve 190 bar without too much trouble just drops off to approx 30bar after 10 mins . however pumps up quickly back to 190 bar with only 10 pumps . think me needs to order some seal and get down and dirty.
     
  8. secretagentmole

    secretagentmole Low down, dirty and quiet...

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    Wait are you judging pressure on the gauge on the pump?
    I think I might have your answer.

    You aint done up too tight!

    There is no way an air reservoir on an Axsor will go from 30 bar to 190 bar in 10 pumps, unless you are using a pump the size of a petrol tanker!

    So it must be a leak on the hose/probe/ hose/pump or pump!

    Either that or the damned bleed screw is not done up tight enough. Either way something is leaking, my guess, bleed valve or dripac!
     
  9. jjones

    jjones Well-Known Member

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    Sounds like the valve isn't opening on the cylinder and you are only compressing the air in the pump line?
     
  10. seakingfixer

    seakingfixer Engaging Member

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    Thanks for all the input guys . Did a pressure test using some kit from work . Confirms a leak in rifle so strip down it is . In truth as an engineer the little boy inside me ain`t that disappointed. Once again I appreciate you all taking the time to help . :)
     
  11. seakingfixer

    seakingfixer Engaging Member

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    Inlet valve (PW104) trashed. previous owner has fitted new seals but looks like he got stevie wonder to take the old one off with a hedge trimmers .
     
  12. andy draper

    andy draper Posting Addict

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    I did a service on one a while ago,all seals from a service kit.Pressure droped about 40bar in 2 weeks,finally found the culprit.I immersed the cylinder in a bowl of water,there was the tiniest air bubble coming from one of the three set screws that bolt the filling end cap into place.If it still looses pressure try doing this test,as I would never have thought it would leak from there.
    andy.
     
  13. Shropshire Shooter

    Shropshire Shooter Well-Known Member

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    I've got a Brummie Raider with a similar cylinder. It's fine at the moment, but in the event of a leak from one of the three screws - did you fix it - and if so - how?
     
  14. droid

    droid Posting Addict

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    I've just bought one of these pumps and I had the same issue initially, albeit was I hadn't tightened the adapter up enough, it needed to be stupid tight.

    When topping up my Vermi up from 160 bar to 200 bar I was shocked at the effort required. I saw a youtube video with some mad dude pumping like there was no tomorrow and seem to do it in 2 minutes and quite effortless. Well if that is how you do it there is something wrong with him, me, the pump or my Vermi. As it was cowing hard work to top mine up.
     
  15. andy draper

    andy draper Posting Addict

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    I wrapped a bit of ptfe plumbers tape beneath the o ring,only a couple of times round,refitted the o ring,dab of lube and gently put the end cap back in the cylinder.Don't overtighten the three set screws,they just need nipping up.The o ring came in the chambers service kit,so it should have been a perfect seal,it was only the tiniest of leaks though.
    andy.
     

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