Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 240Get this manual
Tighten manual release valve to full right (clockwise) Operate trim motor in "up" direction by connecting trim motor wires to 12 volt power supplyConnect blue wire to positive (+) and black wire to negative (-)This procedure will lift motorpump assembly housingSlowly remove fill screw to bleed pressure from reservoirFrom full closed (clockwise) positionSlowly turn manual release valve counterclockwise four turns to bleed remaining pressure from systemRemove bolts (a) and lockwashersLift motor and pump assembly from housing INOPERATIVE TRIM MOTOR REMOVAL Slowly remove fill screw to bleed pressure from reservoirFrom full closed (clockwise) position, slowly turn manual release valve counterclockwise four turns to bleed remaining pressure from system Remove bolts (b) and lockwashers