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That last seal you mentioned is in the rebuild kit I got. What I don't know and should have checked, is if it is a standard o-ring size that you can get anywhere, without having to buy the whole kit to get it.
I also used the power piston out of an M809 series airpac like is mentioned in this...
I got mine here since they had the best price at the time. Maybe there are cheaper ones but I am not sure.
http://www.eriksmilitarysurplus.com/rekitform55t.html
What oil are you going to use in the airpak? Some people suggest hydraulic jack oil and some say air tool oil.
I ended up using the hydraulic jack oil,l but would like to see what your thoughts were.
I got some clarification from Oldfart last night.
These pics are of the G749(left) and M54/M800(right) pistons next to each other. The M54 piston internals are a larger diameter but the externals are the same diameter.
Here is what Oldfart told me:
"It is my understanding from Gun Freak that...
Am I understanding right that all we need out of the 5 ton airpak is this??? I pulled this out of an 800 series airpak.
That will allow us to use the 5 ton rebuild kit? Will all the seals we need be in that kit?