I just recently replaced the electric trim motor on my 1998 Mercury 225 outboard. I had some issues with a broken bolt that forced me to remove both the old motor and hydraulic pump. Now that I got that settled and the new motor installed, the trim does not seem to cooperate. The new motor works great. The hydraulic cylinders, trim and tilt, seem to be sticking or partially operating when under load ; they operate slowly along their full range when not under load. I first thought it was air in the system, however the manual claims that the system is self-bleeding when the cylinders are run up and down 3-5 times. I don't want to take the cylinders apart, but I think that is what I am up against in order to track down the problem. Is there another way to confirm that there is no air in the system or should I just buck up and inspect the cylinders?
