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Crosman Ratcatcher Help Needed!

Discussion in 'Anything Airgun Related' started by oling, Jan 19, 2017.

  1. ped

    ped Posting Addict

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    I've a full breech stock shroud setup for a disco and a multi shot version of the breech that takes a .20 rapid mag
     
  2. oling

    oling Well-Known Member

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    Ah yes, good point, but I have the tank as the stock (it's an 2250 AS) so makes it very difficult to shoulder for me personally.
     
  3. oling

    oling Well-Known Member

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    Yes, it does seem to be some peculiar problem with the HPA bottle I have set up. Must get access to a diving bottle hopefully this week or next to (hopefully) rectify the problem as that's what happened last time I sent it off where they claimed there was absolutely nothing wrong with the bottle. I think it's some case of just reseating some seals in the bottle that may have suffered due to me venting the bottle too quickly or such like. It's all a bit strange tbh.
     
  4. ped

    ped Posting Addict

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    until you test with another bottle or co2 source you won't know which is at fault
    the side port seals (the front double seal mainly)have a tendency to obstruct the ports when they're sealed up
    bite the bullet buy an 88g and try with that if it seals fine it's the bottle if it p****s out of the barrel it's the valve stem seal that's fubar'd and needs replacing
     
  5. Rodents' Rapture

    Rodents' Rapture Active Member

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    The last pressurized outlet to the barrel is the valve-stem seal, which eventually dries and hardens under HPA. Evacuate the system and the seal will soften back up after a few days. It'll seal until it dries and hardens again. Remove the valve-stem, slap some PG oil or silicone on it to get and keep it soft/plyable and get back to shooting.

    R's R
     
  6. mick 1986

    mick 1986 Keyboard Hero

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    Have you tried cocking the rifle before filling? Some rifles the hammer touches the firing valve enough to open it slightly. This is enough to let air out when pumped up.
     
  7. oling

    oling Well-Known Member

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    This is good advice but I have tried this to no avail. I now know it is a problem with my HPA bottle (second time this has happened) but I'm also pretty sure there is a slow leak in the system which is frustrating because I've resealed everything with new seals and even added a drop or two of pellgun oil on the seals. Have taken it apart numerous times, just really want to get it to a position where it's not leaking anymore like I had it before! haha
     
  8. Stickofdynamite

    Stickofdynamite Engaging Member

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    Ask Ped. If you don't get the right answer then no-one can help. Sounds to me like you should change your valve stem and cock the gun before filling. 2250's are easy, very easy. AS2250's are temperamental, personally I would avoid at all costs, arseholes in my opinion. Not a lot of point in the whatsoever.
     
  9. Squirrelking

    Squirrelking Donator

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    Just a thought, you did replace the bottle seal like for like didn't you? The later ones have a different seal.

    Little bit more to go wrong but hardly the end of the world. So long as you seat the seals properly and take care of them they will be as reliable as any other. Mines been stripped down twice since I got it and not had any grief (touch wood). As for point, it's nice having the weight balanced out rather than everything in front of the trigger unit.
     
  10. Stickofdynamite

    Stickofdynamite Engaging Member

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    Not mine, I have owned several but wouldnt own one again. To much hassle for little gain imho. If I was to buy one now I would break it and use the parts.
     
  11. SteveO

    SteveO Top Poster

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    The whole valves are only £17 from eBay, I've just bought one to return my 2250 to C02 as I'd done the piercer chop mod. (I know I could buy just the piercer/stem but it was cheap enough)

    http://www.ebay.co.uk/itm/351949477036?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT

    Holy crap how can they justify a price hike of £8 in the last few weeks? :confused: Now £24.99
     
    Last edited: Feb 4, 2017
  12. ped

    ped Posting Addict

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    they all leak to a degree ask on the crosman groups and you'll find some would never have another due to them leaking and others love them
    to fix this imo you need to strip it again and fit a new stem ,you could fit a discovery stem if you increased pressure to 1200
    you'll also need to fit new side port seals if using crosman ones but I use std o rings which are reusable you use a bs007 for the rear block to piercer assembly and for the front outer seal
    for the little cup to the valve I used to use a std tp gasket but I noticed that they have changed the spec of this part on the later ones so I got some metric 2x2 ones to try but as yet have not tried them
     
  13. SteveO

    SteveO Top Poster

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    I must have bought a good one as it has never leaked, I've left it for months pressurized with the HPA tank on and it has never lost a drop.
     
  14. ped

    ped Posting Addict

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    you must be lucky Steve
     
  15. Squirrelking

    Squirrelking Donator

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    Same with mine, holds a charge indefinitely.
     
  16. oling

    oling Well-Known Member

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    Yes I agree, I opted for this over a standard 2250 as my project gun because I planned on doing a complete HPA setup with the bottle as the stock. It is absolutely fantastic when it works but it is a nightmare to get just right!
     
  17. oling

    oling Well-Known Member

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    To echo the above, I had it perfect and it didn't lose a drop of air for around 9 months or so but then I took the bottle out and must've deformed the bottle seal or something.

    I think I've finally got it sorted - there's no obvious leak (other than the possibility of a very slow one) as it's been gassed for about 24 hours and hasn't lost any noticeable amount of air. Basically this rather temperamental HPA bottle started filling again when I left it for a while (which was a large component of the problem). It seems that the bottle has a tendency to stop working if I let all the air vent quite quickly so from now on if I ever need depressurise the bottle again I will be draining it shot by shot.

    The other issue was not so much one of the seals per se but on the left hand side of the gun where there's that pipe that travels length ways along the gun, the right screw here has a hole that goes into the frame of the gun (not sure if it's supposed to). But, I basically needed to bung it up (I used a small piece of a thick o ring which then expands to fill the whole as the screw goes into it).

    I can honestly see why these were discontinued. While it's been a dream when it's working, it's been quite a hassle to get to this point. I've invested so much in it but I know it's one of a kind and it's surprisingly accurate (I've easily managed sub 1/2" groups rested at 30 yards with RWS Superfields).

    Mine's kitted out with american dark walnut grips, brass safety, brass trigger, brass barrel band with QD stud, HPA bottle that I've maxed out the internal regulator to ~1100 psi, multi shot breech, mattw silencer and all topped off with a Simmons WTC 1.5-5x20. It makes for a lightweight and compact multishot hunting rig that gets 130-140 shots per fill at ~11.2 FPE w/Superfields.
     
    Last edited: Feb 5, 2017
  18. Squirrelking

    Squirrelking Donator

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    Define quickly, are you letting the air blast out and freeze up?
     
  19. SteveO

    SteveO Top Poster

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    Are you advised to run these HPA tanks at higher pressure than 850PSI?

    That's what mines regged to and I wouldn't like it higher than that personally.
     
  20. Squirrelking

    Squirrelking Donator

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    Of course, what do you think happens when the tank drops below the regulator pressure? All the regulator does is make sure the outlet doesn't go above a certain pressure, it can't make up what isn't there. I charge mine to 2.5k IIRC, about halfway between the last interval and the red line (which is the same for the bottle and pump).
     

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