1995 Johnson/Evinrude Outboards 40 thru 55 2-Cylinder Service Manual, Page 300Get this manual
Modes of Operation UP
1When the UP button is pressed, the pump Q) rotates in counterclockwise direction2Fluid pressure opens the UP check valve opening the DOWN check valve
moves the pump control pistonmechanically
3Fluid pressure is directed to the bottom of the cylinder to move the piston UP4Low pressure fluid leaves the top of the cylinder, moves through the open DOWN check valve returns to the pump Q)