I take every one apart. That was instilled in me in tech school in the 80s. You don't have to blueprint - I never do, But you need to clean them out, check things, make sure the relief valve functions, and adding a little grease on the rotors will pull the oil up a lot faster when you preoil.

Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.