Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 330Get this manual
POWER TRIM
"DOWN" Pressure Check
IMPORTANT: Insure battery is fully charged before performing tests1Tilt outboard to full "Up" position and engage tilt lock lever2Slowly remove "Fill" plug to bleed pressure from reservoir3Remove circlip securing manual release valve and unscrew release valve from trim assembly
NOTE: small amount of trim fluid may drip from manual release valve holePlace suitable container under trim assembly to collect any leakageNOTE: Assemble test adaptor by using O-ring installation tool to position small O-ring onto adaptor 1st, then install medium O-ring and lastly large O-ringThread brass fitting into test adaptor securely using teflon tape on threads3