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Hatsam Vortex Type 1 Ram..What Am I Missing??

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Ronno6:
Geez...who woulda thunk it??

I have net been able to remove the shaft bushing. Is that normal?
Can both O-rings be replaced from the same end of the bushing?

mikeyb:

--- Quote from: Ronno6 on August 12, 2023, 02:51:59 PM ---Geez...who woulda thunk it??

I have net been able to remove the shaft bushing. Is that normal?
Can both O-rings be replaced from the same end of the bushing?

--- End quote ---

Shaft bushing threads probably have a good dose of thread locker. It didn't move for me until it was "smoking hot".

I don't think it is necessary to unthread the bushing to change both shaft o-rings, but it may be easier(?)
There are fine tools for o-ring removal called o-ring picks. They look similar to dental tools. Search Amazon or Harbor Freight for "o-ring pick set".

Even with these tools I found the process of removal and replacement quite challenging. Hope you find it easier than I did ;-)

Edit: I frequently need to modify existing tools to work BETTER on my air guns. Some days I need to make special air gun tools from scratch!

H95Kidd:
Guys, H95Kidd here--- Remember my recent posts about my 95 Vortex and the "fun" I had replacing the Type1 ram? Happy to report she's shooting well now. Like you, I was also curious to see what was actually inside that defective ram. I was amazed as well about the lack of a "piston" but that internal rod has to go somewhere when the pressure is released. Pretty much acts the same as a piston I would guess...  Regarding replacing the o-rings, a better way may be to soak the brass cap in some solvent (carb cleaner, maybe?) that will serve to SWELL the o-rings, and thus make it easier to pluck them out. It's VERY easy to scratch/damage that brass or the grooves where the rings reside, and possibly affect the sealing ability of the replacement o-rings. Ask me how I know ::) If you can get the existing o-rings to swell and get somewhat "proud" of the grooves, it will be much easier to get ahold of them with an o-ring pick or other suitable tool, and hopefully avoid any damage to the grooves/brass cap. As an aside, does anyone know the correct material (buna-N, silicone, or what) and the correct durometer rating of these o-rings? If my Vortex ram decides to fail again I might consider a repair. That is, replacing the o-rings and a recharge to 130 or so bar. The ram says a MAX charge of 150 bar, not sure what they contain when new from Hatsan.

Ronno6:
I believe mikeyb has spec'd 90durometer Buna-n
8mm x 12mm

From what I saw in one online test, carb cleaner and acetone really swell them buggers up...........

H95Kidd:

--- Quote from: Ronno6 on August 15, 2023, 10:00:25 AM ---I believe mikeyb has spec'd 90durometer Buna-n
8mm x 12mm

From what I saw in one online test, carb cleaner and acetone really swell them buggers up...........

--- End quote ---

8mm ID, 12mm OD, but what thickness? Also, 90 durometer is pretty hard, but guessing it is a toss-up in terms of the right combo of sealing ability AND decent  longevity. Also, does anyone know what "bar" the Type 1 ram should be pre-charged to? Verbage on the ram itself says 150 bar MAX. Is there a rule of thumb to use, like a 10% reduction when initially charging (maybe use 135 bar, or less?). Just curious is all, as to what others have done here when rebuilding Hatsan type 1 rams.

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