Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 333Get this manual
POWER TRIM
CLEANING AND INSPECTIONTRIM RODS AND CAPS
CAUTION
Do not remove check valve (a)Check valve is preset to operate at specific pressureRemoval and installation of check valve could result in improper operating pressure and possible system damage
NOTE: Check valve is in port side trim rod only1Inspect check valve and check valve screen for debris; if debris cannot be removed, replace trim rod assemblyClean trim rod with parts cleaner and dry with compressed airaCheck ValveCheck Valve Screen
Trim Rod End Cap Seal