Yamaha F50A Service Manual page 33

Tilt-down function
When the power trim and tilt switch is pressed to "Down", the motor turns the gear pump counter-
clockwise, thus pumping the power trim and tilt fluid to the down-main valve. As a result, fluid pres-
sure 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 down.
When the tilt piston and the free piston reach the trim cylinder base, it pushes the base down, allow-
ing the balls to move inward. Once 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 ram.
The end of the tilt-down range is when the tilt piston and the free piston bottom out in the trim cylin-
der base. When the power trim and tilt fluid pushes the trim cylinder down further trim-down is
started. The end of the trim-down range is when the trim cylinder arrives at the bottom of the power
trim and tilt cylinder. Before 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.
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