1992 Johnson Evinrude "EN" 40 thru 55 Service Manual, P/N 508143, Page 320Get this manual
Component Description
r:;l UP CHECK VALVEWhen opened by pump pressure, it to bottom of cylinder to move piston UPWhen opened by pump control piston, it allows low pressure fluid to return to the pump as the piston moves DOWN
LJ directs fluid
r:;J DOWN CHECK VALVEWhen opened by pump pressure, it directs fluid to top of cylinder to move piston DOWNWhen opened by pump control piston, it allows low pressure fluid to return to the pump as the piston moves UPr:;-] PUMP CONTROL PISTONMoved by pump pressure, it the UP and DOWN check valvesTogether, they control fluid direction and cylinder movement
L!J controls
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 openThe MANUAL RELEASE VALVE has integral expansion relief to protect the unit from extreme pressures caused by thermal expansion of the fluid