Impact issue

[Sal]

Got my impact 2 days ago and went out to the range, shot about 400 rnds. It worked as described. Went out yesterday morning and couldn't group anything. Checked it out on the crony when I got home and now it's shooting between 690 and 665, a deviation of 25 with a 16 round mag. I made no changes to any of the adjustments, as it was working at decent levels. Any thoughts would be appreciated. Sal

 

[Jack.K]

Check the pellet probe set screw to make sure the probe is secure because if it's loose then the probe can get miss align with the transfer port which gain give you this problem. 

 

[Sal]

No luck, pellet probe screw still tight.

 

[Jack.K]

Have you try hand loading pellets without the magazine? Which version of the shroud did you get with you Impact? Are pellets clipping on the shroud? Barrel thoumb screw tight?

 

[Raja]

What bar regulator is set at and is this velocity at max hammer level.

 

[Raja]

There is screw that adjusts the hammer setting on the side and with shots fired it moves back I had to adjust and add threadlock to it .

 

[Sal]

Hey Raja, I did adjust the Hammar setting, it helped but didn't get it back to 900 fps. After shooting a couple of mags it starts to drop off again.

 

[Sal]

The bar regulator is set at about 120.

 

[7deuce]

I had to put the regulator up to 140 and valve to 2 long and 2 short lines to get 900fps

 

[Txboy]

It sounds to me that it could possibly be that the piece that screws on to the end of the valve rod that the hammer strikes has came loose and unscrewed a little not letting the valve open all the way. The set screw that holds it in place could be jamming the valve and not letting it open properly also. Sounds like you have already checked the hammer spring set screw. 

 

[Sal]

Thanks TX boy, Is there a way to check the end of the valve rod and still maintain a warranty?

 

[Txboy]

The only way to check would be to take the gun apart. You might be able to unscrew the adjusting knob off then take 11mm wrench and unscrew the adjusting knob body off. If the rod is hung up in the body the set screw backed out and got jammed. The gun must be depressurized. Good luck hope this helps. If unsure just send it back and let them fix it under warranty. 

 

[drid]

My friend has had the impact and has had nothing but trouble with it from day one!!!

 

[Verve]

What cal is it .. .22 or .25?

1. If the reg gauge was reading 120bar when you got the rifle, you should send it back anyways as factory set is 140bar (that shows on gauge around 150b on most). The gauge could be faulty to begin with.

2. You can visually inspect the position of the hammer seat (HS) and PUR o-ring on the valve stem.

Valve stem screws in to valve seat (toward the left of picture) and hammer seat screws in to the right of valvestem.

Picture below is a rough guide. I couldnt take the picture of hammer seat and o-ring but in good light you should be able to see it.

Straight line is where the white PUR o-ring is, and distance from the opening on the right to end of o-ring is appx 6mm.

If the difference is significantly less, one of the two has happened:
a. Valve stem has come loose from the left (valve seat) side
b. Hammer seat has come loose



Either way, you'll have to send it back for warranty repair.

Hope that helps.