Impact regulator woes rant

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biohazardman

biohazardman

Member
Jul 3, 2019
5,451
255
Herriman, UT United States
So had a bad regulator rod on my Impact when I got it last year. After a few hundred rounds it caused a 20+bar jump in reg pressure and the related POI jump all at once from one shot to the next while shooting a string. So I would turn the reg down and then it would stay at that setting for a few hundred shots before dropping down 20+bar from one shot to the next. So I would have to turn it back up again. This went on for several months then I called Airgun Depot and they referred me to FX. Called FX and was told probly was regulator o-ring NOT but was the regulator rod/piston. You can see the problem in the first pic a big nick in the rod. So did a phone order with FX but never got the payment option e-mail. So, ordered a Huma had it in a week put it in and it werqs fine for a few months but now leaks. Complained about FX here on the forum and was actually contacted by FX got the payment e-mail and my parts were sent quite promptly. Impressive service it was. Now check out the regulator rod they sent me in pic two. Looks like I will be contacting them again. Believe it or not all of this is normal day to day occurrence for me this type of thing happens so often that I don't even get angry but just expect it. It's sad but true. My scopes sent back, my laser sight sent back so many things I get are scratched and dented up. It's got to the point where if it werqs or I can fix it I keep it. The good thing is that most everywhere I go I am first in line it's like crazy but a good trade me thinks.



My original reg rod



My new reg rod far worse than my old rod.

It's a small thing but it has to be right for the gun to function correctly.



Edit; Leak was at gauge not regulator. Tightened gauge 1/2 turn and it stopped.


 
I would return the Huma and try it again before spending more time on the FX regulator. For some reason ($$), FX refuses to use a proven off-the-shelf reg from a quality maker, and continues to attempt its own. Your problem with the Huma is not common, and could be as simple as replacing an O ring, but since it's new, I would just exchange it for another one. 
 
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It looks like the belville washers have sharp edges and it is cutting into the piston and causing stiction. If FX is warrantying this part, have them send washers too, as there's the defective part wrecking the plastic piston. If you are fixing the issue yourself, take some 600 grit wet/dry sandpaper to the inside edges of the washers. Slightly round and polish the edges of the holes then apply a small amount of silicon grease upon reassembly. It should work without binding after that. 
 
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I would agree with the FX Tech statement, as I have had more problems with several Huma regulators than I want to remember. In fact the latest Huma reg I tried, never worked correctly right from the first day I received it. Wildly drifting outlet pressures finally delegated it to an expensive paper weight. Probably will never purchase another.
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It's an extremely simple device. What did Huma have to say about the problem?
 
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I've returned at least two Huma regulators to the vendor. One I finally got to work acceptably, not right, but acceptable. And the other as stated before; is now an expensive dust collector. Frustration eventually overcomes motivation.
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Ya gotta work through the problem but I understand it's easier to throw money at it sometimes. I've done the same.

Huma has been pretty helpful to me and together we worked out the problems with their gen1 and gen 2 regulators. I got the first one working so well that I never installed any of the replacement and prototype parts they sent me.
 
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It looks like the belville washers have sharp edges and it is cutting into the piston and causing stiction. If FX is warrantying this part, have them send washers too, as there's the defective part wrecking the plastic piston. If you are fixing the issue yourself, take some 600 grit wet/dry sandpaper to the inside edges of the washers. Slightly round and polish the edges of the holes then apply a small amount of silicon grease upon reassembly. It should work without binding after that.
Click to expand...


Never thought of dressing the inside of the bellville washers sounds like a good idea.
 
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Click to expand...

I would agree with the FX Tech statement, as I have had more problems with several Huma regulators than I want to remember. In fact the latest Huma reg I tried, never worked correctly right from the first day I received it. Wildly drifting outlet pressures finally delegated it to an expensive paper weight. Probably will never purchase another.
Click to expand...

It's an extremely simple device. What did Huma have to say about the problem?
Click to expand...


Have not talked with them as yet but as stated it is likely just an o-ring so I will fix it.
 
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Tell me how the Huma leaks and we'll solve the problem.
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Leaks out of the weep hole. Likely just and o-ring on the adjustment screw. Maybe one from the FX o-ring kit I bought will fit.
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What generation is your gun?

Does it only leak above a certain pressure ? It did not leak when I first installed it.
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Gun is a gen2 not an x but just before.

I don't know about leaks at other pressures I'm only at 140-145bar at the moment.
 
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Gun is a gen2 not an x but just before.

I don't know about leaks at other pressures I'm only at 140-145bar at the moment.
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Sounds like the big end of the piston is at the top of it's bore in the receiver. This lets the oring on the big end of the piston push out and leak out the weep hole. The oring is probably not damaged.

The solution is to add 1 more washer with the curve in the same direction as the one before it (an FX one will work). This makes the big end of the piston ride deeper in it's bore. Then with a knife or scribe, make a scratch from the little hole on the small end of the piston up to the end. This prevents the internal oring from blocking the hole when you first pressurize the gun. The scratch won't affect anything else.

1571243955_8373502895da747b3806e80.68792814_HP1 fix -.jpg



 
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Gun is a gen2 not an x but just before.

I don't know about leaks at other pressures I'm only at 140-145bar at the moment.
Click to expand...

Sounds like the big end of the piston is at the top of it's bore in the receiver. This lets the oring on the big end of the piston push out and leak out the weep hole. The oring is probably not damaged.

The solution is to add 1 more washer with the curve in the same direction as the one before it (an FX one will work). This makes the big end of the piston ride deeper in it's bore. Then with a knife or scribe, make a scratch from the little hole on the small end of the piston up to the end. This prevents the internal oring from blocking the hole when you first pressurize the gun. The scratch won't affect anything else.







biohazardman said

In my reading the literature on the Huma I found where it said one could put a set of FX bellville washers to add to the stock ones to increase reg pressure on the gen one Impact. So, I did that on the gen2. It werqed fine for a number of months I ran it at 150-160 bar but after the plenum install I turned the reg back down to 140-145. I am a good thread and a half probly more from the adjustment screw being level with the block so should be good. The leak is recent but I don't want to tear into it until I have the parts to fix it. I was hoping to have the FX parts to replace the Huma if I found I did not have the correct 0-rings. That did not werq out so well. So, it can leak for awhile 10-20bar in several hours, till I get parts. That's not enough to stop me from shooting.

Thanks for all the help



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FX sent me a second regulator rod at no cost as it should have been and it is a beautifully machined little piece of plastic that will make my gun werq again. Good for FX. Sometimes it's the small things that matter. 





First replacement I purchased from FX. Original on the gun never was quite right. Damage to

the top was self inflected. Notch on the side

was the problem



hT9XQVH.png


Second replacement is a good one.




 
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