Patent ID: 6042434
Filing Date: 2000-03-28
Classification: B63H

Abstract:
A hydraulic tilt and trim adjustment system for a marine drive that runs through a range of speeds including low and medium speed and high speeds, the tilt and trim adjustment system comprising an actuator having a stroke length and at least one chamber, a portion of the stroke length corresponding to a trim range of the marine drive and the balance of the stroke length corresponding to a tilt range, a pump being connected to the chamber by a pressure line to selectively supply a working fluid to chamber of the actuator, a reservoir tank communicating with the pump, a passage connecting the cylinder chamber to the reservoir tank, and a tilt relief valve positioned within the passage and arrange to control flow through the passage, said tilt relief valve being open when said pump is active, a pre-selected pressure occurs within the chamber, and the actuator is operating within the tilt range, and closed when the pump is inactive, the pressure within the chamber is below a pre-selected pressure, and the actuator is operating within the tilt range so as to maintain the tilt position of the marine drive when running at slow and medium speeds.