2001-2002 Yamaha 50HP F50Z/T50Z Ouboard 4-stroke engines service manual, Page 31Get this manual
Technical tips Tilt-down function When the power trim and tilt switch is pressed to "Down", the motor turns the gear pump counterclockwise, thus pumping the power trim and tilt fluid to the down-main valveAs result, fluid pressure opens the down-main valve and the down-shuttle piston, which causes fluid to flow into the upper part of the trim cylinder and forces the tilt piston downWhen the tilt piston and the free piston reach the trim cylinder base, it pushes the base down, allowing the balls to move inwardOnce the balls move in, the trim cylinder is then able to move down and power trim and tilt fluid continues to flow into the cylinder and pushes the trim cylinder down, along with the tilt piston and ramThe end of the tilt-down range is when the tilt piston and the free piston bottom out in the trim cylinder baseWhen the power trim and tilt fluid pushes the trim cylinder down further trim-down is startedThe end of the trim-down range is when the trim cylinder arrives at the bottom of the power trim and tilt cylinderBefore the trim cylinder arrives at the bottom of the power trim and tilt cylinder, an amount of fluid equal to the volume of the ram is returned to the reservoir