dynamic88

does anyone know how you go about setting up the hydrolic system on a convertible? i have a 65 olds dynamic 88. i tried tonight to get the hydrolics all set up and purged but im not sure i was doing it right. there seem to be alot of air going through the lines. i filled the motor up as full has i could get it, then i put a tub into the fill hole on the motor and dropped the other end into a gal jug of hydroilic oil, then tried raising the top while sucking in oil at the same time. does this sound right or am i doing it wrong? thanks chris