Huma regulator leak on my Impact X

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heavy-impact

heavy-impact

Member
Sep 13, 2018
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Right Coast, USA
I installed the new Huma "extra high pressure" tuning regulator on my Impact but it starts blowing steady out the vent hole behind the safety after 1 to 5 minutes. The valve o-ring that came on it had a couple of cracks in it on the first try. I pulled the regulator and changed the o-ring and it held pressure for about 2 minutes before blowing steady out the vent hole. I pulled the regulator again and the o-ring still looked good but I changed it anyway. The gun held pressure for about 1 minute and started blowing steady again. I've cleaned and inspected over and over but this thing has me stumped. Everything works perfectly until it starts blowing. No small leaks, the regulator adjusts predictably, the belleville washers are stacked in the exact pattern that Huma outlines... any ideas? The Huma reg is about 2 or 3 mm shorter overall due to the different washer stacking for higher pressure.
 
Hi Heavy Impact,



I just got my my high pressure fx impact reg from HUMA. Mine has been sitting at 170 bar for the last 2 days. When I looked up the fitting instructions on the website (huma-air.com) it lists two different instructions based on when I bought my gun. Have you checked this? I havent actually checked what the difference in instructions are....look @ the below link under fx guns to find fx impact instructions - there two....im just checking to see if you knew this and it might help you. I have a pre 2018 model, so I used those instructions for my gun. 



https://www.huma-air.com/Fitting-instructions
 
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Do you mean the little white disk that goes under the plunger? If so it's in there. Which pressure version did you get?
Click to expand...

I can set it to low, medium, or high depending on how I set the washers
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I understand about the washers. How many did yours come with? The extra high pressure version only comes with 12 washers making the overall length 3mm less than the FX reg.
 
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Hi Heavy Impact,



I just got my my high pressure fx impact reg from HUMA. Mine has been sitting at 170 bar for the last 2 days. When I looked up the fitting instructions on the website (huma-air.com) it lists two different instructions based on when I bought my gun. Have you checked this? I havent actually checked what the difference in instructions are....look @ the below link under fx guns to find fx impact instructions - there two....im just checking to see if you knew this and it might help you. I have a pre 2018 model, so I used those instructions for my gun. 



https://www.huma-air.com/Fitting-instructions
Click to expand...


The instructions are for guns purchased before or after September 2018 and look to be the same. How many washers came with yours and how many are you using?
 
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Also,



I also just checked...there is no real difference for the instructions.....HUMA sold fx impact regs that came pre-assembled before 2018 and the new regs from HUMA come unpacked so the parts do not get damaged, and the user can choose his/her stacking configuration.



I just reached out to HUMA....they suggest adding 2 more of the factory springs to the bottom side of the piston in the same stacking configuration so there will be a total of 14 disks, instead of twelve for the high power version. Try this and see if it helps.
 
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Hi Heavy-Impact,



Im using 12 disks (it came with 12 in the pack)
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I think 12 was too short for the piston bore in my gun. I added 2 washers from the FX reg and it's holding at full pressure now. This moved the base adjustment to 100 bar. I'm reassembling the gun now and will test fire soon. The whole gun is apart because I added a 5.8mm titanium valve seat from Earnest Rowe.
 
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Awesome!!!



Make sure the added disks are at the bottom of the piston, other wise the o-ring collar can be smashed.....
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They're in the same configuration as the standard Huma regulator now. Just fired a few shots over the chronograph and I'm getting a very consistent 904fps at 130 bar with 45g JSB. No tuning yet but I'm hoping for at least 950. What's your setup?
 
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Awesome!!!



Make sure the added disks are at the bottom of the piston, other wise the o-ring collar can be smashed.....
Click to expand...


They're in the same configuration as the standard Huma regulator now. Just fired a few shots over the chronograph and I'm getting a very consistent 904fps at 130 bar with 45g JSB. No tuning yet but I'm hoping for at least 950. What's your setup?

~~~~~~~~~~~~

Good for you. I just now found your OP. 

I had the same problem with my FX Impact when installing the Huma. After pulling out my last 2 hairs, I broke down and called Ernest Rowe at FX USA in North Carolina. This patient gentlemen talked me through the correct procedure for installing the Huma regulator.

If you have any further issues or questions, give them a call during business hours:866 639-0772.
Click to expand...


 
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Good for you. I just now found your OP. 

I had the same problem with my FX Impact when installing the Huma. After pulling out my last 2 hairs, I broke down and called Ernest Rowe at FX USA in North Carolina. This patient gentlemen talked me through the correct procedure for installing the Huma regulator.

If you have any further issues or questions, give them a call during business hours:866 639-0772.
Click to expand...

Click to expand...


Could you tell us what he said to do different from Huma's instructions?
 
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Ill try to find out more about the issue tonight when I contact HUMA.
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Not much need, they already told you what I told them. They suggested I add 1 more washer but I told them I had already tested 2 and it works fine. Just did a little tuning and I either need more hammer spring or weight. Going up to 150 bar produced 940fps with 45g JSB and 890fps with the 51.2g cast hollow points in my avatar (cast by Loren). The wind was gusting pretty good and combined with my old heartbeat affects accuracy. At 60yds I got about 5/8" 10 shot groups with the pellets and about 1 1/4" with the cast hollow points. I'm sure I could knock a 1/4" off of those groups on a day with no wind.
 
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I'm very happy with my Huma regulator, I have ZERO creep now. Thanks to those who offered help.

Edit.. Huma has been very responsive and helpful. They have also updated the Fitting Instructions.

Your Impact X serial number must be 183534 or less to use the Huma tuning regulator.
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Okay. I've been researching several of these Huma/Impact threads, and still have a little confusion with misconceptions I think I've had.

1) I thought my Impact X had the LATEST "new regulator", as was identified by a serial number being engraved under the trigger guard. I've seen videos and posts where it has been stated that if a serial number is engraved under the trigger guard, that gun has the "new regulator". Apparently there is an even newer regulator, as I have a serial number under the trigger guard, but my gun serial number is 183382, well below the published 183534 serial number after which the Huma Tuning Regulator for the Impact (X) won't work anymore. I am assuming sn 183534 is where they enlarged the regulator housing opening in the action for yet another newer regulator?

2) I thought there were three versions of the Huma Tuning Regulator for the Impact (X)… Low Pressure for 45-95 bar, High Pressure for 80-150 bar, and Extra High Pressure for 145-190 bar. From reviewing the latest fitting instructions and the problem solving other forum members have worked through (thank you all SO MUCH!), I believe there is actually only one regulator, but 6 different washer configurations... 3 for replacing a factory regulator with a 14mm piston, and 3 for replacing a factory regulator with a 16mm piston. So, by buying what is listed as a standard Huma High Pressure Tuning Regulator for the Impact, any of these pressure ranges can be achieved by changing washer configuration? It appears if you buy a specific configuration and don't have enough washers to make the desired configuration, washers from your factory regulator my be used (this is stated in the latest fitting instructions from Huma).

Bottom line... it appears my gun serial number will accept the current Huma Tuning Regulator for the FX Impact (x), and I can buy a unit packaged as the standard High Pressure model (80-150 bar), and adjust the washer config to install it as an Extra High Pressure (145-190 bar) range regulator, because the actual regulator components are the same.

Do I sound like I have it correct? Because I'm ordering a standard HP model of the Huma right now. Thanks!

Added concern: All my logic assumes the washers are all the same spring tension, and the only thing that varies is the quantity used for the different configurations. Are the washers sent with the standard HP kit of a different tension than the ones sent with the Extra High Pressure kit? That could be something I didn't consider.


 
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