Mercury Optimax 75, 90, 115, DFI starting year 2004 service manual., Page 450Get this manual
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POWER TRIM
6 Reinstall fill plug7 Run trim UP8 Disengage tilt lock lever9 Open valve (f) and close valve (g)10 Run trim DOWNMinimum pressure should be 3480 kPa (505 psi)11 Tilt outboard f