Mercury Mariner V-250 V-275 Outboard Service Shop Manual 1990, Page 309Get this manual
Installing Power Trim Pump NOTE: Trim pump and hoses are filled with oilOnly remove shipping caps from hoses when ready to make connections to outboard
cInstall flush mount bracket (c) to pum ith two 38 in24 bolts and lockwashers
Do not electrically operate the power trim pump without having the pump hoses connected to the outboa rdHydraulic pressure willlorce shipping caps off ends of pump hoses1If mounting pump on side an internal bul head fo llow steps "a" Ih ru "d ,"