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Believe that my benjamin 392 air rifle, which doesnt hold any pressure when pumped, has maybe a totally useless pump seal, which looks good enough but still no pressure even when coated with grease,, OR the valve is rapidly leaking back the air into the pump cylinder as no air is leaking into the pellet barrel
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Contact the authorized repair facility in your area. It is listed in the back of the manual By Blue Streak I am assuming you have a C9 which is .20 caliber. They will direct you as to what can be done to fix or repair your air gun. I have a Benjamin Sheridan C9 Blue Streak from circa "95" when they still ad walnut stocks. I have shot maybe 20 pellets out of the 500 rounds in the red Diablo pellet box I bought with it. Paid a hefty $170 or so for it new. It is still like new. Bought a Beeman .177/.22 switch barrel barrel cocker. I hate all the pumping.
A gun sorry this is the area and iam the wrong person because i would ban all guns the world over including air powered ones as well ,sorry to be a grunge BUT?
pyramidair.com has a seal kit. it also comes with a diagram. Benjamin and Sheridan air rifles do not have springs to propel the pellet. also never use vasalin. specifically for a Benjamin or Sheridan you need to use pelgun oil (also found at pyramideair.com). use pelgun oil because it is a non detergent fossil compound) the main intention is to condition the seals every 250 rounds. never use silicon based lube for this gun specifically. silicone lube is for spring air rifles such as break barrels.
Springs tend to loose their performance after a few years is air rifles. Check also the seal/o rings on the piston rod and the blow hole. I found waxing it with Vaseline makes it last longer and seals more.
I recently purchased a rebuild kit for my 342. I bought the kit from airgundepot. It was the kit for the
392 and I modified it a little. On the new plunger, you have to drill a hole in the center of it the same
size as the pin's smallest diameter. You can use all of the parts in this kit except for the small o-ring. I think it sold for about 39 dollars or so. My rifle was manufactured in 1972 and it fires like new.
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