Mercury Mariner Models 135 150 175 200 Service Manual, Page 464Get this manual
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POWER TRIM
6 Reinstall fill plug7 Disengage tilt lock lever8 Open valve (f) and close valve (g)9 Run trim "DOWN"Minimum pressure should be 500 P.S.I(35 kgcm2)10 Tilt outboard full "UP" and engag