Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!
Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.
I agree, 1/4 would be too small, just pointing out "some" of them might be.
On a side note, I got an air assist kit from an A3 and it doesn't seem to have the low-air-saftey valve. I looked in the A3 TM and didn't see one listed. Do the A3 truck's air assist not have the low air cutoff valve?
Could be a rust spot(in the cyl) too. Have you added oil to the system at all? The compressed air contains moisture. Also, when you were talking about "flow" Those PDFs in the link I posted showed some with 1/4 air lines and some with 3/8 air lines. You might want to look at that too.
Check the installation links at the bottom of this link.
Air-O-Matic: Maradyne
Edit, the "AOM service document" shows 5 different cylinders with 2 different bores.
In addition to checking the air supply, you can always find a larger diameter air ram to replace the one you have. The original system had 3 size options.