Tuning At-44-10

[steelnfur]

I've got an older Hatsan at44-10, I can hear air leaking by the fill port after I fill up. I took it to Utah Air Guns and they said that they could not repair it. 

Is this a common thing? How difficult is it to fix? 

I'm fairly new to air guns, had this one about five years. It's a .25 cal if that makes any difference.

 

[Rodan1975]

Probably just needs a new o-ring kit. Look on the "Tube" I believe there are a few instructional videos on there. The AT-44 is a beast of a airgun!!! It's a slept on classic!! 

 

[UCChris]

Should be fairly easy. Use some soapy water to find the leak, degas the gun, then find a schematic and start disassembling to see what you can find. If it's never been serviced, it's more than likely that an o-ring just needs some silicone grease and you'll be back in business.

 

[Raden1942]

Hey man you probably just have a small piece of debris in your fill port. Degass the gun completely and take off the air tube. It should screw right off. Now look on YouTube there should be a video on how to do that. Inside the fill port area there will be orings and a seal that acts as a check valve. That means it should let air in but seal back when that air stops coming in. Basically it's a seal that when working properly only let's air go one way. I suspect that you have a piece of debris slightly blocking it from working. If you feel like you cannot do this then pm me and I can do some research for you and walk you through it. I have an at44 but never took the air tube apart. I have done it on lots of other guns however. You should buy new seals for everything inside the at44 and replace all the ones in the air tube while you are fixing it. You might want to replace the rest of the seals while your at it but if that is too much trouble then just do the air tube. It's not that hard to do. Be careful not to scratch the metal trying to remove seals. I use dental picks from harbor freight and take a file and sandpaper to the tips to blunt them. This makes them extremely dull and prevents accidental scratches. If you really feel like it's something you can't do then you can send the stuff to me and I'll do it for you. I only ask that you give me good feedback and pay for shipping. I'd rather you do this yourself tho and gain the experience. You can do it! 

 

[Rocko]

If it's leaking from the fill port, this should help



https://www.youtube.com/watch?v=WoZuAujW70Q

 

[Raden1942]

That's exactly the video you should watch

 

[smokeOnBro55]

The above is why I like this site so much .. people taking their time to hunt down a video and post it to help someone

kudos 

 

[steelnfur]

Thank you, that's exactly what I needed!

I'll let you know how it goes.

 

[steelnfur]

Perfect, thank you!

 

[steelnfur]

My at 44-10 was manufactured in December of 2012, and it is different than the video rifle. None of the parts are the same.