1991 Johnson/Evinrude EI 60 thru 70 outboards Service Manual, Page 281Get this manual
Trim IIQUTIIITiit IIUP" Mode 1When the UP button is pressed the pump rotates in clockwise direction2Fluid pressure opens the UP check valve and passes through UP shuttle valve to the DOWN shuttle valvewhich mechanically opens the DOWN check valve3Fluid pressure is directed through the UP check valve to the bottom of all cylinders, pushing pistons UP4Lower pressure fluid leaves the top ofthe tilt cylindermoves through the open DOWN check valve and returns to the pump5Low pressure fluid leaves the top of the trim cylinders Q) and travels to the reservoir6To allow for the volume differential caused by the piston rods, additional fluid is drawn into the pump from the reservoir7When all the pistons are completely extended, increased pressure opens the UP relief valve to protect the unit from stall pressures