1999 "EE" Evinrude 70HP 4-Stroke Service Manual, P/N 787023, Page 179Get this manual
2 DR7558
Tilt-DownTrim-In
1When the DOWN button is pressed, the motor and gear pump will rotate in counterclockwise direction
2The oil pressure will open the DOWN check valve and oil will be forced through the DOWN shuttle valve When the oil reaches UP shuttle valvethe UP check valve will begin to open mechanically
3.The pressurized oil flows through DOWN check valve and then enters the upper area of the tilt cylinderThis forces the tilt rod piston downward
4When the swivel bracket contacts the trim rams, this pressure forces the trim pistons downward and oil from the reservoir is then able to enter the area above both trim rod pistons