Hatsan Trusty Hatsan 44 leaking from barrel

[Southerngunner]

After 4 years with no issues holding pressure a couple days ago I had a rabbit in the the crosshairs ,pressed the trigger and CLICK, . I thought maybe the heat just got to it but when I tried to refill the tank air was coming out of the barrel. I pulled the tank and checked the o-rings they were fine. I have never been inside the gun so if anyone can give me some guidance it would be appreciated. I don't want to screw it up by not knowing how disassemble it properly.

 

[KatoKevin454]

the Poppet O-rings are in the gun end of the Cylinder, so you don't need to take the gun completely apart, (Flash diagram but same air cylinder as AT-44 design)
AT-44 air Cylinder has the main Valve at the end of the air cylinder, the brass part houses Poppet, gun should have came with spare O-rings and Poppet Nylon seal that is in the plastic baggie. Steel poppet.

 

[KatoKevin454]

AT-44 Diagram, not hard to do just make sure you have Silicone Grease or Silicone oil to lube the O-rings, the Poppet is made from stainless steel and the Poppet seal is Nylon, there should be a baggie of spare parts that came with your gun, these parts should be in there.

View attachment AT44-10_QE_exploded_view.pdf

 

[Southerngunner]

I was able to get my rifle to stop leaking. I removed the a I r cylinder and could not get the manometer end piece out so I removed the other end. I then poured some 92% rubbing alcohol down the tube and took a cleaning rod with shotgun patches and swabed it out several times. A lot of small particles came out after several rinses with alcohol and letting it dry I sprayed some silicon oil down and let it work on the o- rings. Rinsed with the alcohol again and let it dry. I reassembled the tube and it took a charge and held pressure. So far it's holding and I'm keeping my fingers