Yamaha trim and tilt question
Recently bought a boat with a mid 90's Yamaha 70 HP 2 stroke on the back. The trim and tilt motor runs, but doesn't engage to go up and and down unless I give it a little help by slightly lifting up on the engine. Acts like a hydraulic motor does when it's low on fluid. My question is is the trim and tilt something that fluid can be added to, or is it a self contained unit? I'd hate to have to pull an engine that's running well just to change the trim and tilt if I don't have to. Any feed back would be greatly appreciated.