GTA
Airguns by Make and Model => Benjamin Airguns => Topic started by: cmhobbs on January 15, 2022, 08:03:44 PM
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Hello, folks! Long time, no post. Recent events in life have brought me back to my airguns! While taking some inventory, I pulled a Benjamin 347 out of the cabinet that had a "stuck pellet" note on it. So some history and a question:
I bought this rifle in a non-working condition. Got a repair kit from Pyramyd Air (PY-A-624) for models with a soldered valve. Took this dude apart (what a chore!) and got the new guts put in. It shot great for maybe 50-100 rounds and then a pellet got stuck in the barrel. Pressure seemed to drop over time dramatically. Into the cabinet it went for probably a year or more and I just pulled it out, cleared the pellet, ran a cleaning pellet through it and it seemed to shoot just fine. Dropped a real pellet into it and it got stuck again.
I don't detect any leaks and it seems to generally operate just fine, it's just not holding pressure. It does make a quick sucking puff noise when you extend the pump handle all the way out but it's always done that after I repaired it and I assumed that was the rifle drawing air in but maybe I've done something wrong.
Anyone have any idea what might be going on? Should I pick up another repair it and undergo that crazy process again?
Thanks!
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What material were your new seals made from? I rebuilt my Benji 310 with teflon seals and had to keep it pressurized with 4-5 pumps for a few days for the seals to ''seat'' well. I seem to remember some tuners recommend to give the new front seal a tap with a wooden dowel and hammer to help seating it.
Also I need to cock the gun before pumping, otherwise pressure doesn't build up. HTH.
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Hey, thanks for the reply!
I'm pretty sure they were nylon and/or rubber. Here's the kit I used: https://www.pyramydair.com/product/benjamin-sheridan-repair-kit-fits-some-pre-1995-multi-pump-guns-w?a=624 (https://www.pyramydair.com/product/benjamin-sheridan-repair-kit-fits-some-pre-1995-multi-pump-guns-w?a=624)
I tried cocking it before pumping and that seems to have worked once but it failed a second time. I do wonder if perhaps it's also a pellet issue. The pellets getting stuck were crosman's hollow points (a variety I typically avoid but they were gifted to me). I fired a crosman match pellet and a jsb match pellet with no issues. Same weight.
I figured the seals would be set by now but just in case, I went ahead and cocked it, pumped it 5 times, put the safety on, and put it in the cabinet.
Couple of questions while I'm thinking about it: what's the typical range for number of pumps on these and how far should they shoot? I know they're not going to be as hot as my modern airguns. Is there also a modern version of this particular rifle? I'd like to shoot this one sparingly due to age so it'd be neat to have a twin model I could play with a bit.
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Not in .177 but in .22, and some have been converted to .177 in the short time they have been on the market. https://www.crosman.com/ (https://www.crosman.com/)
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quick followup: i kept about 5 pumps in the rifle for just over a week and that seems to have resolved the issue, thankfully. i suppose i'll store it with a couple pumps in it from here on out. thanks for the info!