2001 Mercury Mariner 50-60HP Factory Service Manual, Page 318Get this manual
POWER TRIM
Theory Of Operation
The Power Trim system consists of an electric motor, pressurized fluid reservoir, pump and trim cylinderThe remote control (or trim panel) is equipped with switch that is used for trimming the outboard "up" and "down", and for tilting the outboard for shallow water operation (at slow speed) or for "trailering"The outboard can be trimmed "up" or "down" while engine is under power or when engine is not running
Adjustments
Trimming Characteristics
NOTE: Because varying hull designs react differently in various degrees of rough water, it is recommended to experiment with trim positions to determine whether trimming "up" or "down" will improve the ride in rough waterWhen trimming your outboard from mid-trim position (trim tab in neutral, straight fore-andaft, position), you can expect the following results: