Problem with a Huma reg. for my MK3

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DBlue

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Dec 14, 2022
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USA
I bought a new Huma reg. to replace the second reg. on my MK3.I removed the factory reg., installed the belleville washers exactly as shown in the Huma directions....put bottle back on and tried to adjust the new reg....could not get any pressure to read on gauge. Degassed gun, removed the new reg. doubled checked everything and re-installed...same results. Tried different washer stack configurations etc. etc....same results. Was exactly following the directions as written....same thing. I took my rifle apart so many times I said enough is enough....put the factory reg. back in...no problems. I sent the Huma reg back to where I bought it from, I just could not get it to work no matter what I tried. Has anyone else had this same kind of problem with a Huma reg...?????

I called FX USA and told them I was having problems with the second reg., they said no problem, give us your mailing address and we will get a new one headed your way......That's pretty Awesome service.....Thanks FX....:)
 
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Macros said:
Nope never had that happen before.

I've installed humas into every fx gun I ever bought up until the Panthera and they've all been marked upgrades vs the delrin piston FX reg, especially in terms of refresh time.

The newer brass piston FX reg is pretty much on par with a huma now as far as I can tell.
Click to expand...
I don't understand what was causing it to do that....I know I was installing it right, installing a regulator is not rocket science. I have been working on guns for way longer than I can remember....it just bugs the hell out of me not knowing what was wrong with it. The guy that I bought it from said he is going to install it in one of his Crown rifles when he gets it back to see if it works in it...I hope it does, but I know damn well I couldn't get it to work in M3. I measured the belleville washers and the piston etc. and they measured as the right size for it and tried different washer stacks etc....'Oh well I tried...lol
 
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DBlue said:
I don't understand what was causing it to do that....I know I was installing it right, installing a regulator is not rocket science. I have been working on guns for way longer than I can remember....it just bugs the hell out of me not knowing what was wrong with it. The guy that I bought it from said he is going to install it in one of his Crown rifles when he gets it back to see if it works in it...I hope it does, but I know damn well I couldn't get it to work in M3. I measured the belleville washers and the piston etc. and they measured as the right size for it and tried different washer stacks etc....'Oh well I tried...lol
Click to expand...
That little white pad that goes into the top end of the belleville washer and stem setup sounds like the problem to me. Easily miss positioned.
I've installed a Huma gen 3 high pressure regulator in my Crown mk2 600mm .25 cal., and besides having to dump the air when lower the pressure, I found it I incredibly repeatable and very quick to recover. I'm running it 168 bar, and there it stays. It will go up 2 bar after filling the 700 cc air vessel, but after a couple of shots , it right back at 168 bar.
 
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MEC17670 said:
That little white pad that goes into the top end of the belleville washer and stem setup sounds like the problem to me. Easily miss positioned.
I've installed a Huma gen 3 high pressure regulator in my Crown mk2 600mm .25 cal., and besides having to dump the air when lower the pressure, I found it I incredibly repeatable and very quick to recover. I'm running it 168 bar, and there it stays. It will go up 2 bar after filling the 700 cc air vessel, but after a couple of shots , it right back at 168 bar.
Click to expand...
I tried that also, it comes with two of the small delrin spacers, I took the first one I tried out and installed the second one making sure it was square to the piston still would not work. I know lots of people swear by the Huma regulators, that's why i bought one but with my luck I couldn't get it to work in my gun.
Thanks for your reply.....
 
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Ca_Varminter said:
I have installed 6 Huma 1st and 2nd Regs without a problem..
I think their design of this Reg is excellent, especially working at High Reg pressures!!
It just could be a bad adjustment screw air passage...
Did you try to passing a fine wire through the holes??
Click to expand...
I didn't put any wire through it, but maybe that's what the problem was...I got so frustrated re-installing it so many times, I just packed it up and sent it back...
 
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Just a FYI to the thread...
Here are the Passages to check in the Huma-Air reg's aluminum body,
There are 2 ports about 90° apart...
These passages allows air to pass from the FX receiver(from the 1st reg) into the reg.
20230617_174631.jpg

20230617_174706.jpg


Next is the brass adjustment screw. It has one hole the passes through the width of the screw. This where HPA from the FX 1st reg enters.
20230617_161701.jpg

On the bottom is a hole the intersects with the above hole. This the exit hole of the HPA.
Once the Reg set pressure is reached, it will be closed by the brass piston pressing on a small Delrin disk that is sandwiched between the two...
20230617_161848.jpg


Finally is the Brass Piston where Belleville spring washers will be located.
There are small holes on the side of the stem where the HPA enters.
20230617_162435.jpg


Then there is the exit hole on the bottom that intersects the above hole. The HPA from here will enter the plenum...
20230617_163233.jpg


Also for reference.... here is the small Delrin disk that is sandwiched between the adjustment screw and piston
This what creates the seal that cuts off the HPA when reg's cutoff pressure is reached.....
20230617_190003.jpg
 
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Ca_Varminter said:
Just a FYI to the thread...
Here are the Passages to check in the Huma-Air reg's aluminum body,
There are 2 ports about 90° apart...
These passages allows air to pass from the FX receiver(from the 1st reg) into the reg.
20230617_174631.jpg

20230617_174706.jpg


Next is the brass adjustment screw. It has one hole the passes through the width of the screw. This where HPA from the FX 1st reg enters.
20230617_161701.jpg

On the bottom is a hole the intersects with the above hole. This the exit hole of the HPA.
Once the Reg set pressure is reached, it will be closed by the brass piston pressing on a small Delrin disk that is sandwiched between the two...
20230617_161848.jpg


Finally is the Brass Piston where Belleville spring washers will be located.
There are small holes on the side of the stem where the HPA enters.
20230617_162435.jpg


Then there is the exit hole on the bottom that intersects the above hole. The HPA from here will enter the plenum...
20230617_163233.jpg


Also for reference.... here is the small Delrin disk that is sandwiched between the adjustment screw and piston
This what creates the seal that cuts off the HPA when reg's cutoff pressure is reached.....
20230617_190003.jpg
Click to expand...
I would say that one of those ports had to be blocked with something as I can't see any other reason why it was not letting air into the plenum....I didn't try sticking any wires in them as it was brand new out the package.....
 
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Hi DBlue...

As I was typing up my post had a thought.....
Not knowing the history of the Huma Reg.
I wonder if someone try to install it, incorrectly!!
They thought they had a reg leak bypassing the O-ring on the neck of the aluminum body.
So they could have tried some Teflon tape..Bad..
Anyway some pieces could have lodged in those two holes in the aluminum body.
Or some pieces worked their into the passages in the adjustment screw!!!

Just a thought.....
 
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Ca_Varminter said:
Hi DBlue...

As I was typing up my post had a thought.....
Not knowing the history of the Huma Reg.
I wonder if someone try to install it, incorrectly!!
They thought they had a reg leak bypassing the O-ring on the neck of the aluminum body.
So they could have tried some Teflon tape..Bad..
Anyway some pieces could have lodged in those two holes in the aluminum body.
Or some pieces worked their into the passages in the adjustment screw!!!

Just a thought.....
Click to expand...
There had to be something blocking one of those ports for sure....I did notice that the two ports in the aluminum body were kinda rough looking, not clear open machined or drilled holes, with not being familiar with the Huma regs I didn't do anything to them as I just thought that was normal. maybe that was part of the reason it would not work. On the reg in the pics you posted, are the two holes in the aluminum body clear open holes? Looking at your pics again with the wires in the two holes in the aluminum body, those holes should be clear open holes...they were not in the one I had... since they were in the threads of the body I just thought that was the way they were supposed to be. I wonder now if that was the problem with it...???
 
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DBlue said:
There had to be something blocking one of those ports for sure....I did notice that the two ports in the aluminum body were kinda rough looking, not clear open machined or drilled holes,..... those holes should be clear open holes...they were not in the one I had... since they were in the threads of the body I just thought that was the way they were supposed to be. I wonder now if that was the problem with it...???
Click to expand...
Wow all the ones I have installed those holes are Very Well defined....
But if they were blocked by some metal swarf, it would have been very simple to clear those passages.

So You Live and learn a little.....
If you had no Air passing through the Huma Reg(with the FX reg working normal before)
First I would have installed the reg body with adjustment screw installed , but no piston.. check for air passing
(Just screw on the bottle just until air flows)
If no air, remove the adjusting screw. Check for air passing......
Still no air, remove the reg body and check for air passage, but with this step is should also clear out any debris....
The Process of Elimination......The Engineer's Best Friend!!!!!
 
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Ca_Varminter said:
Wow all the ones I have installed those holes are Very Well defined....
But if they were blocked by some metal swarf, it would have been very simple to clear those passages.

So You Live and learn a little.....
If you had no Air passing through the Huma Reg(with the FX reg working normal before)
First I would have installed the reg body with adjustment screw installed , but no piston.. check for air passing
(Just screw on the bottle just until air flows)
If no air, remove the adjusting screw. Check for air passing......
Still no air, remove the reg body and check for air passage, but with this step is should also clear out any debris....
The Process of Elimination......The Engineer's Best Friend!!!!!
Click to expand...
Yep....I'm pretty sure now that's what it was....I was a dumbazz for not catching that.....Like you said live and learn....:)
 
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You never know. Even products that are overall awesome have some bad ones get produced. I upgraded a gauge to one of the great wika gauges and it had a super slow leak out of the gauge itself right out of the box. You did the right thing sending it back. You shouldn’t have to work on a brand new reg to get it to function.
 
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