1999 "EE" Outboards Accessories Service Manual, P/N 787026, Page 164Get this manual
Component Description
UP CHECK VALVEWhen opened by pump pressure, it directs fluid 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
MANUAL RELEASE VALVEWhen opened minimum of three turns, it allows the engine to be manually raised or loweredIt also contains the EXPANSION RELIEF VALVE, which protects the unit from extreme pressures caused by thermal expansion of the fluid 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
rn PUMP CONTROL PISTON -valvesTogether, they control Moved by pump pressure, it controls the UP and DOWN check