Pull the first one, then (I think) a cutscene plays. That or before you pull it. anyways, run to the second one and pull it too. Then find the 2 space pirates flying around and go into hypermode. Kill the one that tries to pull the lever back (and the other one if you want but he should follow you. just ignore him if he does). the go to the thrid one and pull it. Or, basically, get all 3 levers pulled without letting the pirates pull them back.