New Hatsan AT44S-10 owner needs some help

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lamarkeiko

Member
Jun 22, 2017
129
2
Oregon, United States
I posted a question for help yesterday on a thread I had started earlier, but it seems to have dead ended, and I couldn't get an answer or help to my question.
The question will mostly be directed to Hatsan air rifle owners with experience in the removable air cylinder.
I'm a 3 day owner to my first PCP rifle. Yesterday on my deck I found a broken oily O ring in the area where I have been pumping up my gun, and also the same spot where I first unscrewed the air cylinder from the gun. I first thought that the O ring may have came from the end of the air cylinder where it screws in, but I don't think so now. The size isn't right My rifle came with a bag of O ring spares, but none are the same size as this one. My pump also came with an assortment of O ring spares, and there is one that looks to be the same size. I can't imagine this O ring coming from the pump. Its never been disassembled. Is it possible there may be another O ring inside the gun where the air cylinder is screwed in.
I'm attaching photos of the broken O ring with a ruler for size comparison, the end of the air cylinder and a view of where the cylinder screws in.
I would very much appreciate some help or opinions if they can see anything that doesn't look right. I don't have any problem pumping my gun up, and once I do, it seems to hold a charge. The gun does seem to drop down in pressure faster than I expected when it is shot.
Lamar

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Hynzie, you are wasting my time with your answer and showing your intelligence on this forum. Please reply to something you know about. I've already concluded that the groove on the end of the cylinder does not take an O ring. I think the cylinder end is in perfect order. As far as the Warranty is concerned, I don't even know if I have a problem yet. Please, someone who has knowledge of this gun reply back.
blackdiesel, if your out there, could you give me a reply.
 
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The gun is very easy to service, I wound think that you don't have any thing to worry about. In your picture, your looking at the striking end of the hammer. To the top is the tranfer port. There no more Orings in that area of the gun. In the AT44 the pop Valve in fixed in the end of the air tank. Carrying all the Oring in this area on the tank. From your pictures of you gun it looks normal.
-Can you air up gun's air cylinder off the gun and have it hold air?
If that the case it sounds like the gun's normal, and you nothing to worry about. I'm leaning toward that the Oring may have been a factory fix that was on the bench when you pump was assembled. And may have stuck to the pump feet, falling off later to cause unneeded worry.
There are some larger O-rings in the end neer the fill probe opening inside of the cylinder. But I can't believe with out disassembly you'd find the those Orings.
The Hatsan's are rock solid guns.
But very thin layer of silicone grease on the Orings. Screw that tank in and get to having some fun!!
If you have problems you welcome to PM me,

 
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Thank you very much Mrshosted and Alan for your replies back. These are the type of replies I was hoping for. I believe the theory Mrshosted had on where the O ring came from may be very possible since the O ring was laying very close to the shipping box I removed the pump from and started pumping up the gun the first time. That same area on my deck is also where I unscrewed the cylinder from the gun before I ever pumped the gun up. I was concerned that it may have been pulled out of the chamber in the gun where the cylinder screws in. As far as the cylinder holding pressure, yesterday evening I pumped up to about 2900 psi and this morning about 14 hours later, the pressure is about 2500 psi.
I don't know if that is normal for this gun. According to Alan, this may be normal. If the cylinder was unscrewed from the gun after pumping, would there be a better chance that it would hold it's pressure?
 
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It's a new gun, there some break in the valve and seat Oring silicone grease will work into to gether. Some air may leaked out. Don't sweat the small stuff. It's more likely, One other thing to think about, when you hand pump it builds heat. When the air is hot it expands making the pressure higher. A day later you come back it's cooled off and holy cow 2500psi. After two day does it drop to 2100psi. If not. No problem. If so you may have a valve problem. Once a gin DONT WORRY ABOUT your gun is rock solid. At the very worst you may need to put a new valve in. Shoot it have some fun, find our poi.
Man, If I where you I'd clean the barel and start shooting. Now that gun doesn't have a regulator as you shoot start noting you POI and the guns pressure. Your going to find a sweet swing. About 15-20 tack driving shoots. For example 160bar to 120bar. From 200bar to 160bar it may want to shoot low. And after 120bar it will start walking down. Don't shoot lower then 90bar.
Pick your self up some 18 gr JSB's and get some lead thru that barel, stop and clean the barel about every 300 shoot or so. 
READ that link at the GTA.. That will help the mind
Have some fun, your guns rock solid. That guns going to open up the air gun world for you, maybe later you'll want a different gun. But today that guns rocking machine. Good choice 
 
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Thanks again Mrshosted
Yesterday evening I charged the cylinder out of the gun to 200 bars and left the cylinder set out on my deck. This morning at 69 deg. temp. outside I checked the cylinder pressure and it was down to about 160 bars. I moved the cylinder back out into the morning sun for a short while, and the pressure has risen to about 180 bars. So I'm sure your right about the air temp and change in pressure. My new chrony, JSB 18.1 gr and a couple cans of H & N's will be arriving Wed. It will be fun to do some shooting then to see what pressure and pellets give the best results. I am now seriously thinking of purchasing an air tank. The pumping up really isn't that hard, but when you want to do a lot of shooting, it just takes too much time. I'm trying to get educated on tanks and fittings. I found on eBay, new 80 cu ft 3300 psi rated with K valve for $210. If my calculations are correct, I think I can get well over 30 fills in the good shooting range of my Hatsan with that tank. Am I on the right track?
 
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