1991 Johnson/Evinrude Models "EI" 40 thru 55 Service Manual, Page 310Get this manual
Component Description
'1l UP CHECK VALVE
When opened by pump pressure, it directs fluid to bottom of cylinder to move piston UPWhen opened by pump control piston, it allows low pressure flu id to return to the pump as the piston moves DOWN
f21 DOWN CHECK VALVEWhen opened by pump pressure, it
directs fluid to top of cylinder to move piston DOWN When opened by pump control piston, it allows low pressure fluid to return to the pump as the piston moves UP
f3l PUMP
CONTROL PISTONMoved by pump pressure, it controls the UP and DOWN check valvesTogether, they control fluid direction and cylinder movement
f4l MANUAL RELEASE VALVE
- When opened minimum of three turns, it allows cylinder fluid to bypass the UP check valve and return directly to the reservoirThe engine can be lowered manually when the MANUAL RELEASE VALVE is open