1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 206Get this manual
POWER TRIM
Power Trim General Information
DESCRIPTION
The Power Trim System consists of an electric motor, fluid reservoir, pump and trimtilt cylinderThe remote control (or trim panel) has switches that trim the outboard UP or DOWN and tilt the engine for TraileringThe outboard can be trimmed and tilted while under power or when the outboard is not running
TRIMMING CHARACTERISTICS
NOTE: Because hull designs react differently in varying water conditions, Varying the trim position will often improve the ride and boat handling
TRIMMING UP (OUT)