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Old 09-03-2007, 07:18 PM   #1 (permalink)
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RT pressure problem, help please!

I have a classic RT and heres the deal. When I gas it up it will shoot 2-3 shots fine, then build up pressure and leak out the back. One shot and its fine again. At the chrono its like 275, 278, 360, 275, 279, 367...I'm not sure what I need to replace, help would be greatly appreciated! thanks!
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Old 09-03-2007, 10:03 PM   #2 (permalink)
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Originally Posted by SN toter View Post
I have a classic RT and heres the deal. When I gas it up it will shoot 2-3 shots fine, then build up pressure and leak out the back. One shot and its fine again. At the chrono its like 275, 278, 360, 275, 279, 367...I'm not sure what I need to replace, help would be greatly appreciated! thanks!
Time for some new o rings and such.
No biggie, just rebuild it.

The Mag Smith | AGD | Air Gun Designs | Automag | Minimag | Custom Mag | Mag Parts

Replace every o ring and washer supplied in the rebuild kit one at a time till its healed.

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Old 09-03-2007, 10:11 PM   #3 (permalink)
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In a classic valve it would most likely be the regulator seat. Not sure what it looks like or where it is in the RT valve.

My guess is replacing the o-ring here will solve the problem (note the picture was stolen outright from an animation on ZDSPB.com): http://www.mcarterbrown.com/gallery/...php/photo/8495
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Last edited by Surestick; 09-03-2007 at 10:20 PM.
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Old 09-04-2007, 01:33 AM   #4 (permalink)
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Yeah, it sounds like classic case of regulator creep, just rebuild the reg. I recommend just replacing all the O-rings and seals, might as well let the new seals break in together than replacing them as they fail.
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Old 09-04-2007, 10:09 AM   #5 (permalink)
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You aren't using CO2 are you?

In case you are, you shouldn't because the RT valve recharges so quickly that it heats up. This heat would cause CO2 to expand and over-pressurize the valve, showing the symptoms that you have described here.

If you aren't using CO2, a rebuild of the reg might be necessary.
You can find parts from the airgun webiste here: Airgun Designs Online Store - X-Valve/Retro/Emag/RT Valve Parts[/INDENT]
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Old 09-04-2007, 05:11 PM   #6 (permalink)
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Its HPA, I think I found the problem. Ordering a rebuild kit asap.
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