I replaced the tilt ram seals, and the seals for the reservoir and the pump gear housing. Now on the bench, it goes up very slowly or not at all, and if i put my hand on top of it, it will not go up. Once at the top, when it goes down, I cant stop it with two hands. It is very strong. Also, if I go all the way down, it will not go up until I crack the blead screw and help it up. If I stop a couple inches from the bottom, then it will go up. Any Ideas what might be wrong?