Umm Brent - here is a "DON'T DO".
You will see, at the output end of your accusump, a safety valve. It has a little ring attached to it to manually open it (by pulling on it).
You DO NOT need to check that this valve works when the thing has 3 qts of
oil in the
oil end and 75psi of pressure in the air end.
You may come to your own conclusion as to how I know this. The upshot was me getting a very stiff lecture from my wife about not wearing good white shirts into the garage. LOL