Tuning PP750 .22 -- Just stopped shooting for some reason

[bambuino]

Had this .22 cal PP750 about 11 months and shot easily couple thousand rounds through it. Broke a poppet back in January and that was easily replaced. So when the pistol stopped shooting a couple weeks ago, figured it was another broken poppet. Alas, not the case. Will be stripping down to the Bellevilles, just as a matter of course. Gun has maintained pressure all these weeks, encouraging. I am suspecting crap in the reg, maybe the sintered filter, which would have to be totally clogged for these symptoms. But...

If anyone has had a similar experience, were you able to determine a cause for your malfunctioning PP750?

ATB, Mark

 

[jonny75904]

What happens when you pull the trigger? Do you hear the hammer strike?

If there’s no action / sound / any evidence of mechanical operation, it’s a problem related to the hammer / spring / trigger assembly.

If there IS action / sound / any evidence of mechanical operation, then it could be related to the valve / regulator / transfer port.

OR…. perhaps maybe you have a pellet stuck in the barrel.



But honestly I dont know that much about that gun, I would just check those things first. I would score my proficiency somewhere between Alec Baldwin and Keanu Reeves.

 

[bambuino]

The hammer is striking the poppet stem, all good there. Tissue testing shows not a bit of air exiting the muzzle nor breech. I did not actually check for clear path to the transfer port when I inspected the poppet. Gonna make a complete tear down soon, and hopefully will find the fault.

Thanks for asking.

 

[scoutscope]

Where did you source your replacement poppet when it broke? I'm very interested to see what you find with the current problem, unfortunately I'm not able to diagnose it.

 

[Stefanjan]

clogged transfer port, or a bad seal. Probably a quick fix. Best of luck

 

[bambuino]

Where did you source your replacement poppet when it broke? I'm very interested to see what you find with the current problem, unfortunately I'm not able to diagnose it.

I ordered up some spare poppets from Wes at AirgunArcheryFun. For larger parts orders direct from Shaoxing/SPA is better even with the 40$US Fedex shipping.

 

[Hawkeye51]

Bambuino

I'm following with interest, as the pp750 is one of my favorites too. Please post a response with pics & details when you tear it down & fix it. Curious as to the exact cause of the problem. Good luck my friend, and stay safe.