1996 Johnson Evinrude "ED" 40 thru 55 2-Cylinder Service Manual, P/N 507124, Page 308Get this manual
Component Description
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
rv three turns, it allows the engine to be manually raised or MANUAL RELEASE VALVEWhen opened minimum of
lowered
f21 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 UP
131 PUMP CONTROL PISTON
f4l DOWN
- Moved by pump pressure, it controls the UP and DOWN check valvesTogether, they control fluid direction and cylinder movement
RELIEF VALVEOpens at approximately 1600 PSI (11,032 kPa) to protect the unit from extreme operating pressures when the cylinder is completely retractedpressures caused by thermal expansion of the fluid