Do I need to bleed the system for air if I add oil to the hydro oil tank? I have the newest model of the 48" stander RH and hydro fluid was coming out from the cap. I opened it and added the recommended oil that was in the manual and made it so that it was 1.5" from the top. What could of caused the fluid to spill from the cap in the tank? The machine only has 32 hours in it. Also is this the bypass valve in order to bleed the system? (see the attachment) This is my first Hydro machine so I am new to maintaining a hydro system. Thanks for any help that you guys can give me, or tips for that matter.