If anyone has any advice that would be great. This is my problem. My last ft match my tx was all over the place. Couldn’t figure it out. Got home and chrono said I was at 735 which I have had it set up around 765. So I added another spacer on the guide and gun wouldn’t cock. So ok, I ordered a new spring and breech seals. Replaced both and power was around 715. New 12 fpe spring and only 715? Had a vortek piston seal in it. So I tried putting my factory piston seal on. 670. Now I’m frustrated. So I took piston and compression tube out. Inspected everything. Only thing I can come up with is with my thumb over compression tube and pushing the piston in I would think u should not be able to push the piston in. I can push it about half way in tube before It gets tough but I can still push the piston all the way into the compression tube. I would think you shouldn’t be able to if everything is sealing correctly. Am I wrong here? So now I have a compression tube ordered. Am I on the right track here or is it possible my last spring went bad and the new spring I got just don’t make the power. It’s a 12fpe spring from pyramyd but only 670 with 8.4s. I shouldn’t need that much preload and spacers right? Any advice would be awesome.
Air Arms TX200 problem
- Thread starter Buckeye86
- Start date
Loosing velocity is a LEAK. somewhere.. three areas. Piston seal, breech seal, broken spring. pending the spring and seal have broken in
Loosing velocity suddenly is one of the three.
Loosing velocity suddenly is one of the three.
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I gu did you could damage a new spring installing it .. I personally like to set mine using a all thread dragging tool thing .. that helps get the preload off and a easy to install spring .. now mind you I don't do aa so ..? Lol works nice on hw..
Ya your piston seal seemed to act normal. You will push it in to make compression with the port hole plugged as you did .. now I do that and try to hold it firm if you can hold pressure where it stopped compressing and it stays in place with out sinking down farther it's holding good seal. It's tough to hold it bit once you do or I do I count to 10 or do and if the piston holds in place under compression it's sealing well. But to there's a too loosba fit or a too tight . For me too tight a piston deal will slow fps and bring g fps down as you shoot. .
Fitting a seal is like the 3 bears. Too loose, too tight , and just right . Look up threads on that fitting a seal to get the idea to try out .
Ya your piston seal seemed to act normal. You will push it in to make compression with the port hole plugged as you did .. now I do that and try to hold it firm if you can hold pressure where it stopped compressing and it stays in place with out sinking down farther it's holding good seal. It's tough to hold it bit once you do or I do I count to 10 or do and if the piston holds in place under compression it's sealing well. But to there's a too loosba fit or a too tight . For me too tight a piston deal will slow fps and bring g fps down as you shoot. .
Fitting a seal is like the 3 bears. Too loose, too tight , and just right . Look up threads on that fitting a seal to get the idea to try out .
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Thanks for all your input. Don’t think it’s the seal because I tried to different seals which both have given me good numbers before. Why I’m leaning towards the comp tube. Since I have another one coming to me I might as well tear that one down and see if the orings are bad.
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That is how they act when they start to have lockup problems. A simple new breech seal will seem to fix it until the next time you take it out, then velocity will be all over the place again. Pyramid shows new cocking shoes in stock, I would start there. If it loosens up again, you may have to cut a shim for the forward edge to tighten it up a bit. Maccarri used to sell an oversized one, that you would just file to fit, but those haven't been available for a few years.
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I thought about the cocking shoe but from what I read online u notice play in the cocking arm and have issues with the safety. I haven’t had issues with those two. My luck that’s prolly it tho. Beings how I just purchased a comp tube. I do get consistent fps though. Just really low
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Latch rod loose and unscrewing itself and short stroking the gun? Doubtful as they're Loctited in place but something to check
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My vote if all the seals are new is also for the cocking shoe, if it is worn it won’t seal the breach.
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Years ago, I had a leaking comp tube where it screws together. I can't remember, but I think there's an o-ring that seals the comp tube? I also replaced the breech seal o-rings which together with resealing the comp tube, fixed my problem.
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I checked my stroke and I came up with 86mm and the latch rod is tight. So checked that off. Have not checked the barrel nut. I will check that as well. I looked over the cocking shoe again and don’t see any damage. Don’t mean it’s not worn a few thousandths. Should get my new comp tube today or tomorrow.
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Thanks for all the input. Pretty certain I have gotten to the problem. The culprit is the cocking shoe. I had more play then I thought. Didn’t have any brass shim stock on hand so I used .005 copper strip. Made the tray around cocking shoe and seen no difference. So I added another .005. That jumped me from 710 to 785fps. 20 shot string and all within 15fps. Now whether the copper will hold up is another story. But definitely the lock up.
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