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Maintenance "BETH has surgery"- -Part 1 and part 2

mr007s

HAM Specialist
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PART 1
While waiting for the required tools and grease I read lots of post and watched many vids to educate myself. I was feeling confident and began the reg adjusting a couple days ago.
Encountered no problems getting each piece to screw apart, that was a relief and one of my worries. Each part was cleaned with alcohol and wiped with a microfiber towel. CTSHOOTER had suggested that 90 degrees CW would be about right for the reduction from 2200 psi to 1900 psi, and he was dead on. Then the areas that needed the grease was applied and assembled, all went smooth. The air cylinder was filled and let set for a few hours and no leaks was detected so I headed to the my bench and began shooting JTS 22.07 ammo thru the chrony. After many HS adjustments The number I liked was reached. I settled, for now, a 945fps setting that had an ES of 4 and SD of 1.7. I am happy so far and patting myself on the back. Dairy boy was very helpful in this area.
I fit the chassis in the stock and find that I was off alignment with the front screw hole by a tiny amount and the screw would not start.

PART 2
No problem, I know what I am doing. I dissemble a second time and get the hole lined up and put BETH back together. Keep in mind that I barley had to turn the gage block so no need to worry about what was about to happen. Began to fill air cylinder and air was leaking out of between the cylinder and the gage block, only place I heard or felt air escaping. Now I am worried if somehow the O-ring part number c-025-0122-00 has someway came off or failed..
Your thoughts on what would be the problem will be appreciated.
I set BETH aside to give it some thought and will take her apart again sometime today.

Things I want to share that may be helpful to others:
Be dang sure you degas the gun completely. If there is the least bit of pressure the parts will be very hard to unscrew, if at all.
Make a pencil mark on the front of the rail and another on the gage block to help get it right the first time.
When you remove the chassis look for the small black spacer that fits between the two safety arms, it will fall out and you may be hunting a long long time before finding it, TRUST ME HERE.
I have watched many vids on adjusting the hammer spring. Only Toms vid mentioned the nylon grub screw that contacts the adjuster. Sure, you can turn the adjuster without bothering to loosen it, but it is there for a reason.
I hope that BETH gets well soon, I would much rather shoot than work on my baby.
Love you guys and thanks for all your post.
Any ideas what I need to look for that is causing the leak, I would be grateful to hear your thoughts
 
Glad to hear that you got it sorted the way you wanted. That tune and extreme spread should shoot great. As far as o-rings go, that particular one, #122, does have a tendency to be tricky to seal because of its placement and those fine threads. A cast polyurethane in 90 duro is recommended by Tom. I have experimented, and an EU cast polyether urethane 70 duro will work. I use the slightly softer 70 duro cast because I am shooting in a really cold environment in the winter months. A standard black o-ring in this location will extrude out and fail, per my experiments.


 
does AOA sale an O-Ring rebuild kit? I have a print out that list the ones needed but have no idea if a kit is offered.
 
does AOA sale an O-Ring rebuild kit? I have a print out that list the ones needed but have no idea if a kit is offered.
I haven't seen anyone who actually sells a kit for the Evol. If you have not seen it, here's a link to the Evol's list of o-rings from The O-Rng Store. You can call in or order online to place orders, but calling has a minimum of $25.00, and there's minimum piece amounts as well. I get the #122 in larger quantities because they are the one's that you will be replacing more often when adjusting the regulator. If you want me to send a single of the 90 urethane or want to experiment with the Viton, send me an address and I'll throw them in an envelope tomorrow.

 
I haven't seen anyone who actually sells a kit for the Evol. If you have not seen it, here's a link to the Evol's list of o-rings from The O-Rng Store. You can call in or order online to place orders, but calling has a minimum of $25.00, and there's minimum piece amounts as well. I get the #122 in larger quantities because they are the one's that you will be replacing more often when adjusting the regulator. If you want me to send a single of the 90 urethane or want to experiment with the Viton, send me an address and I'll throw them in an envelope tomorrow.

I have went back into BETH and the 122 o- ring was damaged. I would like for you to mail me one, maybe 2 in case I cut another during install and I will order me some soon and pay you back. I will message you my mailing info. Sincerely thank you for doing this
 
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I have went back into BETH and the 122 o- ring was damaged. I would like for you to mail me one, maybe 2 in case I cut another during install and I will order me some soon and pay you back. I will message you my mailing info. Sincerely thank you for doing this
I've got you covered with a couple 90 duro urethane #122's. These are not the Viton like the print calls for, so maybe Woogie can send a couple of those your way? Order some for yourself for the future, but don't worry about sending me any; I've got a pretty big supply.
 
I've got you covered with a couple 90 duro urethane #122's. These are not the Viton like the print calls for, so maybe Woogie can send a couple of those your way? Order some for yourself for the future, but don't worry about sending me any; I've got a pretty big supply.
"BETH" is well again thanks to Airgun-hobbist.
He gifted me a couple 122's to get back in the game. I have ordered both Buna 70 and Viton 75 and they will be delivered tomorrow. I assembled Beth and charged with air about 5:00 yesterday evening and the gage has not moved for around 15 hours. If anyone needs a 122 in the future Just message me with your mailing address and I will pay it forward and mail you a couple. So pleased with this group and the knowledge and help they provide.
 
remind me why was Beth on the operatong table? you was turnning her down for the 18gr lead?
After adjusting the reg down to 1900psi from 2200 psi the gage block o-ring took a dump. I wasnt wanting to only shoot 18 grain but also 21.53 and 22.07 grain. I have BETH setuned now at 945 fps with an es of 4 and sd 1.7. Its raining today so I am still waiting to do some serious testing for accuracy
 
my 15" is running the 25gr in the mid 800 fps i think they where aourn 840 850 but cant rall a 100% it shoots the 18 good as well but i have not run those over the crony yet.
i just started shoot the 18 the otherday i got them for he wife and i was out when we were shooting so i loaded some up and was suprised how well they did
 
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I’m having trouble sealing the bigger o-ring on the reg, I have a small leak between the cylinder and the block, am I using the correct o-ring, I think it’s part #122
 
I’m having trouble sealing the bigger o-ring on the reg, I have a small leak between the cylinder and the block, am I using the correct o-ring, I think it’s part #122
Those work but it could be that you are cutting the o-ring on installation. Try this assembly using these steps. It eliminates threading the tube down over the o-ring because the regulator is pushed down onto the cylinder and then screwed on.

 

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