I've spent the last hour reading through the various problems with no luck. No external leaks, system has been bled, motor works fine, will not go up or down (when raised manually with trim up the motor fairly quickly goes back down), tilt and trim cylinders return to full down position. I've looked at the parts breakdowns on mercruiserparts.com but can't figure out where the checkvalves are. I am considering replacing/rebuilding the pump but I'm concerned there may be other areas that are not "holding" the pressure to allow the system to push up. Is it all in the pump assuming no external leaks?
