Author Topic: Gauntlet regulator problems  (Read 495 times)

d_boom

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Gauntlet regulator problems
« on: September 09, 2018, 12:19:37 PM »
Accuracy of my Umarex Gauntlet has deteriorated. Cleaned the barrel but accuracy was not restored.  Then set up
a chronograph to check velocity.  Results showed the regulator is not working consistently.  Shooting JSB 18.13 gr.
pellets starting with a full charge of 3,000 psi. First 10 shots averaged 831 ft/sec, but twice the velocity dropped down
to 790's, the 2nd 10 shots starting at 2500 psi averaged 851 ft/sec. but once velocity dropped under 790 ft/sec.  My
thinking is that the regulator is not working consistently, why?  I have read some regulators need time to work, I took
my time between shots reordering velocity's to allow the regulator plenty of time. 
 
Since the Gauntlet has a 3 year warranty I contacted Umarex.  Talking with Umarex's service department I explained
my Gauntlet has velocity variations of 81 ft/sec.  The guy at the Umarex service department stated; that's good results
as some of the Gauntlets velocity's vary as much as 125 ft/sec.  At this point I am discouraged, sounds as if sending
the Gauntlet back to Umarex for repair would be pointless. 

I requested a parts schematic for the Gauntlet.  Looking over the schematic for part numbers there none were listed
for the air tank or regulator.  I was considering purchase of a new regulator.  Contacting Umarex again I was informed
part numbers were left of the air tank & regulator as these parts were unavailable.

Tanks and regulators are supplied for the Gauntlet by Ninja, so I contact Ninja about my regulator issues. Ninja's service
department suggested degassing my gun and tanking the regulator apart and lube the "O" rings with silicone.  He also 
suggested I might need to install a rebuild kit.

I degassed the Gauntlet and disassembled the regulator to apply silicone lube to the "O" rings.  I noticed the shoulder
on my piston, which retains the belleville spring stack, had rub marks on about 1/3 of the diameter, could rubbing cause
my regulator issues?  I used a small file to remove rub marks, cleaned off all the filings, lubed the piston and "O" rings
with silicone and reassembled. Testing over the chronograph the first 10 shots averaged 857 ft/sec. with a difference of
only 10 ft/sec., but the 2nd 10 shots only averaged 835 ft/sec. with a difference of 95 ft/sec. the former 790's velocity
returned 4 times, I think the silicone helped but did not last.

Viewing Hajimoto's video on adjusting the Gauntlet regulator I noticed the piston for his regulator has two "O" rings, mine
is only made for one!  The piston holds the spring stack in place against a shoulder just larger than diameter of cupped
springs.  Spacing of two "O" rings should prevent the piston from tipping/rubbing.  I think the piston in my regulator made
with only one "O" is still rubbing, resulting in the occasional drop velocity which increased as the silicone lube is lost.  Repair
parts ordered includes a new piston which has two "O" rings, maybe this will fix the regulator.   



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Alan

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Re: Gauntlet regulator problems
« Reply #1 on: September 09, 2018, 12:54:42 PM »
It is always a bummer when a new airgun won't shoot as it should. However, most Gauntlet users are reporting consistent results. But I do remember a wider velocity spread than most PCP in the same price point, but there may be more to that than just the regulator. For example, dirt in the piston area causing issues with the hammer.

Good luck on getting it turned around.
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Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.

rsterne

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Re: Gauntlet regulator problems
« Reply #2 on: September 09, 2018, 02:10:46 PM »
I would check the hammer area for grit or burrs in the tube or on the hammer itself.... The most common cause of inconsistent velocities, in my experience, is an inconsistent hammer strike....

Bob
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d_boom

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Re: Gauntlet regulator problems
« Reply #3 on: September 09, 2018, 02:36:23 PM »
Thanks for the advise.  I plan to go through the internals and install a Jefferson State air rifles Gauntlet tuning kit when it arrives.
I think the major problem is in the regulator caused by rubbing of the piston's shoulder.  My reasoning is the regulator worked
really well in testing for about 10 shots after silicone lube was applied to the regulator, then I believe the lube went away and
the piston started rubbing again.  I went to Ninja web sight and look at their regulator manuals, Ninja's standard & UL adjustable regulators have only one "O" ring on the piston while the Ninja X Custom regulator for
PCP air guns has two "O" rings on the piston. - Danny
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rsterne

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Re: Gauntlet regulator problems
« Reply #4 on: September 09, 2018, 03:07:44 PM »
I have used regulators with one or two O-rings, and both work fine.... It would be unusual to have a poor piston fit cause a problem....

Bob
  • Coalmont, BC