1985 Mercury Outboard V-300 V-3.4L Shop Service Manual, Page 216Get this manual
TRIM PUMP REMOVAL and INSTALLATION REMOVING TRIM PUMP FROM BOAT
Di sconnect trim pump batter leads from batter (negati ve lead firs t) Di scon nect trim harness connector (3 pronged) from trim pump connection point (a)Turn manua release valve knob (b) to full righ (clockwise) position Remove trim hoses from pumpCap end of hosesRemove bolt nd lockwasher ,a nd lif! pump fr om mounting bracket
INSTALLING TRIM PUMP
Slide trim pump into mounting bracket and secure to bracket with holt and lock washer
Reco nnect trim hoses to pumpDO NOT crossthread over-tighten hose fittingsReco nnect trim ha rness connector (3 pronged) to trim pump at connection point (a)Connect ballery leads to battery (posit ive lead fi rst)Turn manual release valve knob (b) wi se) posi tion 10