changing oil right now is a waste of time.. and 90wt is a no-no. use utf fluid.
was the machine even pumping. you didn't tell us if you had oil at that port or not.
untill you get a service manual.. AND tell us what you observed when you primed the pump.. you may be going int he wrong direction. for instance. if you got NO oil out of the plug on the pump after priming.. then pulling the top cover is NOT the next step.