No pressure at all ,in airgun

[dmaustin]

I went to shoot my Hatsun 135QE Vortex just now and when Im went tom break the barrel to load there was absolutely no resistance. It acted as if it was cocked already. I put pellet in anyway and tried to shoot but nothing happened. The gun is 2 years old and I have never had any issues with it, it has only been a couple weeks since I shot it and there were no issues at that time!!  Any suggestions?

[AGEnthused2]

You will get lots of suggestions, it depends on how handy you are it is likely something that you will need to repair yourself. You will need a hand pump and hatsan style fill probe, you may be able to refill it with the hand pump and never have issues again, or you will need to check for damaged O-rings and replace those.
I have two Hasan airguns that have lost pressure on me, One of them has damaged O-rings the other leaks because it sat in the cold for too long. But other than refilling it with a hand pump I haven’t had any issues with the one from the cold.

[dmaustin]

Thanks, Im do have a pump and will try to refill shortly. just thought it was strange that all of a sudden it has no pressure. Will recharge and see how it goes!

[dmaustin]

Well it does not appear to be a pressure issue. Recharged the gun and went I went to cock it the barrel just drops down as if it is unattached. never had it apart any farther than pulling the barrels I. guess I will have to do some studying on it. Any good videos on disassembly of the Hatsan 135 QE Vortex out there?

[Back_Roads]

 He has a few other videos also... https://www.youtube.com/results?search_query=hatsan+gas+ram+repair

[dmaustin]

Recharged rifle to 125bar last night and it was shooting well. Went to shoot this morning and no pressure at all again. I assume I need a new piston seal and I have scoured the internet this morning and I can't find one for this rifle, don't even see one on the Hatsan website. Any suggestions as to where to look would be greatly appreciated!!! Thanks!

[SteveP-52]

Sounds like a failed gas ram, not a piston seal. If you had pressure when cocking last night and this morning there's none, that gas ram is toast and the seals inside it are shot. A new one from Hatsan is $45-$50. Piston and breech seals aren't listed on their site but a simple e-mail to the Hatsan General Inquiries addy and they'll tell you how much. Last piston seals I got were maybe $10 and breech seals were something like 4 for $5 I think.

Air Rifle Headquarters sells seals for the $135 if you want one and also sell the moly paste you'll need if you're going to open it up to clean, relube and replace it.
-Seal: https://www.airrifleheadquarters.com/catalog/item/251485/9734664.htm
-Moly: https://www.airrifleheadquarters.com/catalog/item/251484/42989.htm Word of note, there's enough in that tub to do at least 10 rifles as a little goes a long way and you really don't need much

[AGEnthused2]

I don’t remember the exact rifle but years ago there were gas-ram conversions offered for hatsan spring piston rifles.
It may have been crosman gas rams in the torpedo series, but I haven’t looked for awhile.
You could also go with a spring instead of the gas ram, a tuned spring rifle would have just as many benefits as a factory gas ram rifle.
I’ve not replaced a gas ram with a crosman one or converted a gas ram to a spring as of yet, but my reading indicates both are possible.
You have options.

[dmaustin]

Thanks SteveP-52. Guess Im will check into the gas rams. Have never done one, but I know there are videos out there and I do have some basic skills.

[SteveP-52]

Conversion from gas ram to spring just requires the spring, spring guide and the end cap made for the spring version and yes, the end caps are different. Don't believe they have a top hat but someone who's had one apart can say for sure.

Replacing a gas ram is actually easier than a spring since there's way less preload. With the spring version, you'd be looking at the end cap coming out something like 3-4 inches. With a gas ram, it's something like a half inch or less but a spring compressor is still veryyyyyyy highly recommended and if you're going that far, might as well check everything inside, clean out old gunk, check the piston seal and relube with good stuff before re-assembling.

Look up a guy by the name of Mike Ellingsworth on YouTube, he's made quite a lot of videos on the Hatsan rifles.