Impact diagnosis

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Ernest sent me this once and I could fix it



Low FPS check list;

  1. Insure C1 is bottom out tight
  2. Insure Valve seat is bottom out on valve rod
  3. Use only D90 or harder to replace C3 bumper 
  4. Insure probe feeder block has a distance of 45mm to edge of butt plate.
  5. Check for crack value seat
  6. Clear air passages on regulator piston and adjuster screw, piston and screw my need replacing if vary slow recovery time on reg gauge
  7. Valve adjuster line 4 for testing 
  8. Power wheel on max with no slack on adjuster screw
  9. Reg pressure 140-150b for testing 
  10. Insure Brass TP on barrels not loose 
  11. Insure pellet probe oring and valve rod 2.2x1 oring not blowing when fired
  12. Insure valve housing set screw is seating on the flat surface of the valve housing 
    [/LIST=1]
 
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Shooting correctly @880, air is good, reg is good @ 130. Fps starts dropping per shot 810, 750, 650, i quit firing pellets. Started to dry fire and listen to power drop each shot. After 3 shots all you hear is hammer strike. Reg pressure still steady. I figure it's in the valve. Any experience and or advise is appreciated.
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It's in your regulator not the valve. The plenum isn't refilling fast enough, they don't use all the air in the plenum for each shot. That's why the velocity declines each shot. When you let it sit the plenum slowly refills. I'd pull the reg and check it. FX has a video on youtube if you need it.
 
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Keyman6242, I would remove the barrel and then check if there is anything like pellet fragments that is blocking transfer port etc. Shake the gun quite good to see if anything gets dislodged. I had a similar issue with mine and that seemed to have been the problem. I had checked the valve and the hammer rest (seat) Ernest advised me to check it and to put some Loctite on to prevent loosening. Check what "edosan" advised, too.
 
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Had similar problem, fps dropped to around 350 on MAX setting, .25cal, 600mm barrel, 125+-bar.

C3, 5107, O-ring 2,9x1,78 PUR 90 was busted, hammer could not open the valve no matter what power setting was. Some 0,5 Euro for o-ring and one hour of work later everything was in working order.

If You hear a clanking noise while cocking and pulling the trigger there is also very small chance that hammer spring is broken but I do not think so.
 
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