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Moved this post to here from the General area: 880 leaking air

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airgunaut:
Since late July my shots have intermittently been bizarre. Like too far off to be Just Me. But as I said, it was intermittent. I automatically blamed it on myself until this morning, when yet again the first couple of shots were excellent, like make-me-very-happy accurate, shooting anywhere from 37’ to 50’ standing offhand.

But it was a problem with the 880 after all. Today I actually heard hissing from the rifle when I pumped, but only sometimes. I had not heard that before.

I replaced the o-rings only 6 months ago! During that time, the gun didn’t make any leaking sounds but it wouldn’t retain air for more than a little time after pumping. This time, the gun sometimes holds air well and then it just stops doing so on the next attempt at pumping. Then reverts to holding some air, etc etc. Pulling the trigger only results in a CLICK, and the pellet remains in the gun. I tried adding more pumps and fired it to clear the pellet, which shot weakly, slowly, with a POP much quieter than normal.

The gun is lying in ignominy right now, till I feel motivated to open it up. I did not like repairing it back then and am not looking forward to the process again, such a short time afterward. Shouldn’t the thing work well for more than 6 months?

I have a complete piston assembly (? name) with the elastomer keg etc, plus an abutment assembly and an extra chamber seal that Daisy sent before. I don’t have a bunch of o-rings around, so I’ll open it up only after buying some of those, because I might as well replace those while the thing is disassembled.

Ronno6:
Mr. Pat,
Where do you hear the hissing?
If out the barrel or loading port with the bolt open, your problem is most likely the exhaust valve.
Put a balloon over the end, cock and close the bolt, and see if air leaks into the balloon....
I would consider that for an intermittent problem.
Otherwise it could be the chamber seal or the O-ring that seals the pump tube to the valve body.

Make sure that your pump tube is not moving when you pump the arm.
Possibly your tube (aluminum I am assuming...) may sometimes be riding up over the retaining indentation
in the top of the pump frame. If that is moving intermittently, that could cause the problem.

The piston assembly should not be part of the problem.....

airgunaut:
I heard the hissing from what sounded like the receiver bottom.***

Sometimes it hisses upon pumping and sometimes not. Several times now I gave it a pump or two and listened (no hissing), then closed the bolt and dry-fired. Each time there was a pop of released air. Very unpredictable, erratic behavior. As if something is randomly sitting tight and other times opening or moving in a way that lets air escape.

I’ll have to buy balloons when I next go into town. None on hand. I might try tightly rubberbanding a plastic bag over the muzzle meanwhile. From what happened this morning, the air escapes before the trigger is pulled, sometimes in part and sometimes ALL the pumped air.

When I replaced the o-rings earlier this year, I cleaned and inspected the abutment assembly (the chamber seal looked and felt like a new one). I took apart and cleaned the exhaust valve assembly. The little white sphere thingie (poppet?) looked like new. I replaced the tiny o-ring.

The pump tube is aluminum.


***Just now I test pumped it again. I got the gun to hiss this time. Sounded like air came out the loading port, alright. I pumped some more and quickly put my finger over the port, which changed the sound and volume of the escaping air. When I closed the port and fired, there was still enough air to make a pop.

Oh, BTW, I am a Ms./Mrs.

Ronno6:

--- Quote from: airgunaut on August 10, 2024, 09:23:47 PM ---
Oh, BTW, I am a Ms./Mrs.

--- End quote ---

Well, that answers the age old SNL question.......
My Apologies......

Sounds like exhaust valve.......

caudie:
I'd do an alcohol flush before I took it apart.  Could be just a little crud in there.

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