Need advice installing a HUMA regulator

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RollingStone

RollingStone

Member
Dec 14, 2016
73
3
Kansas
I purchased a HUMA regulator for my .22 caliber gen 1 marauder but before I install it I have a couple of questions. First the small screw in the front of the regulator is there to slow the refill rate and is supposed to be left two turns out but seems loose to me and likely to vibrate out. What have others done to be sure it stays in place? Also I've read that with a regulator the hammer strike needs to be less due to the constant lower pressure available to the valve, should I leave the o rings from a Bstaley tune I did before in place? Any other suggestions as to what to look at or change while I have the gun apart would be appreciated.
 
Tie a piece of good cord or fishing line with a loop on it, to it (the screw-and 2 turns out) push it in with a piece of 1/2 pvc, pex will not vibrate out but you can retrieve it that way-seems others have tried leaving the o-rings with varied results,,there are several ssg,free flight hammer, for reducing hammer bounce /air consumption,what the o-rings did -a lot depends on what tune your after 
 
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I found with my huma regulator, even with the screw two turns out took to long to fully refresh (almost 2 mins for a consistent fps). I ended up grinding amlost half the screw away to get a faster refresh rate. Be careful if doing this, if you take to much away you will see a small fps drop as you go down in pressure. And make sure its heavy fishing line. You mite even want to double it up. Iv had it break on me.
 
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But when you tear the rifle down later does it look like the screw has moved ? I'm wondering why they ( HUMA) drill and tap the hole for the screw at all, why not just drill a tiny orifice hole to begin with. If the tapped hole is already there why not fill it with a screw with an orifice hole in it so that it can be tightened down ? A small loop or hole could be provided for a string or wire hook for removal later. I hate leaving loose parts in a machine; they always work free.
 
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"Wager"I found with my huma regulator, even with the screw two turns out took to long to fully refresh (almost 2 mins for a consistent fps).
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I had the same problem. It took several minutes to return to the regulated pressure after each shot. Huma's troubleshooting suggestions didn't say anything about a screw, and I ended up just taking out the reg.

It's off season in Arizona, so maybe I'll screw around with it more. Can you explain more about your modification?
 
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So there is a screw or at least there should be on the top of where you adjust the bar settings, on the outside. The more you grind down one side of the little silver screw the faster it will refresh. If you take out the screw all to gether or grind to much off it will refresh almost instantly but you will see small drops it your fps as your pressure gos down.
 
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All the HUMA regulators have a headless allen set screw in the center threaded hole except for the regulators made for Benjamin Marauders according to Jeff at Trenier Outdoors where I bought my regulator. The Marauders have an allen headed screw so that a string can be attached for removal. I ended up buying a replacement 3 mm slot headed screw, turned it in three turns and used tie wire to secure it. It wobbles in the hole but cannot turn out and the regulator refreshes quickly. I also made a loop in the tie wire so that I can remove the regulator later.

Testing underway to break in the regulator ( it is not always consistent yet ) and find the best tune. Left in the Bstaley O rings to start with.
 
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Turns out mine does have the tiny setscrew. I just couldn't see it before. I tried backing the screw out and reinstalling it to see whether the refresh time improved. Now it doesn't regulate at all. (Full cylinder pressure straight through.) I'm afraid I may have messed it up by putting a drop of chamber oil in the breathing hole like Robert Lane recommends with his regulators. (If I remember correctly where I saw that advice.) Maybe that's the wrong thing to do with a Huma.
 
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