FX FX Maverick Depressurization

[jakob8572]

UPDATE: I was able to vent through the gauge on the bottle adapter (not sure why I didn’t think of that earlier). Unfortunately, shooting it down from 150 to 0 took forever. However, it did work - refilled and set the second reg. Just hope I didn’t break something new in the process…

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Happy Sunday Morning Y’all! Curious on what steps I should take to degas my rifle. I recently replaced both reg’s with Huma’s and resealed. Got it filled to 250 BAR (no leaks) and the first reg set to 150 BAR (no creep). Here’s where the challenge comes in…

I can’t degas the rifle (other than repeatedly dry firing it. If you say to remove the bottle, I’ll assume you stopped reading before this part. The bottle is valveless, the valve itself is attached to the bottle adapter (I bought used). I’ve also loosened the rear gauge, as I’ve seen suggested elsewhere, but not getting anywhere there either (so far it’s a full 180 degrees from where it was).

Any suggestions on how I can relieve the pressure without undoing what I just fixed (had to fix some leaks) to set the rear reg?

Thanks in advance!

 

[Gerry52]

Here's Ernest Rowe's Master Class video on Maverick. It shows him unscrewing bottle (with valve by the way). Here's the link:
You say yours has different valve, can't you just degas with pressure gauge? Pictures help.

 

[jakob8572]

Here's Ernest Rowe's Master Class video on Maverick. It shows him unscrewing bottle (with valve by the way). Here's the link:
You say yours has different valve, can't you just degas with pressure gauge? Pictures help.

Thanks! I watched that one quite a few times. I ended up venting via the pressure gauge on the bottle adapter. After removing the bottle, I noticed the bottle valve is on the adapter itself (e.g., tank is valveless). I checked everything over, replaced the o-ring under the gauge to be safe and this morning found I lost pressure overnight. The second reg is still set, so I don’t believe it’s either regulator. I‘m guessing it’s the o-ring that the seals the bottle and valve together…

At the moment, I’m trying to decipher FX’s schematics to understand what O-Ring 18x2.5, NBR 70 actually is (i.e. Does the 18 refer to the ID or the OD?). Figured it’d be easier to build my own O-Ring Kit.

 

[Trucker3573]

Shooting down is not a good idea. You will end up damaging the valve. If you have a factory amp reg all you have to do is turn the reg adjuster screw on the second reg a little CCW and the plenum will bleed itself. Alternatively you can bleed it with the reg gauge. I wouldn’t dry fire it like that.

 

[jakob8572]

Shooting down is not a good idea. You will end up damaging the valve. If you have a factory amp reg all you have to do is turn the reg adjuster screw on the second reg a little CCW and the plenum will bleed itself. Alternatively you can bleed it with the reg gauge. I wouldn’t dry fire it like that.

I just replaced both reg’s with the Huma Gen 3 and both gauges for the Wika 28mm mini’s. No matter how much I turned the second gauge, I couldn’t get it to vent - pressure in the plenum maintained that seal (Huma maintains not to vent from the gauge).

Even though PCPs are new to me, I’m somewhat mechanically inclined. Everything went fine with disassembly and reassembly. Got pressure and seated the first reg at 150 (let it sit for ~12 hours and it didn’t creep). I’m guessing I’m guessing I chewed up the o-ring that seals the bottle & valve.

The original leak was at the second reg, which has been remedied and it’s holding pressure. That makes me hopeful the valves are still in good shape, as only the bottle lost pressure.