Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 182Get this manual
Description 1The Power Trim System consists of the hydraulic pump (contains electric motor), oil reservoir, oil pump and valve body, plus hydraulic trim cylinders (mounted on engine) which are connected to pump with hydraulic hosesEngine is trimmed up by both trim cylinders pulling up on the engine swivel bracket2The remote control is equipped with trim switches, which are used fortrimming engine "up" and "down" while engine is under power, and trailer button that is used to tilt engine up for trailering, docking or shallow water operation
NOTE: If the "Down" or "Trailer" switch remains depressed after engine reaches its end of travel, thermal overload switch will open and pump motor will stopTo prevent thermal overload switch from opening, it is recommended that switches be released as soon as engine reaches end of travelIf thermal overload switch should open, do not depress switch(es) for approximately one minuteAfter this period of time, thermal overload switch will close (reset itself) and pump again may be operated