Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 208Get this manual
Shock Function Up Oil inside the down cavity is locked in static position by the closed pressure operated valve (h)the manual release valve and the tilt relief valve (k) If the
outboard strikes an underwater object while in forward gear the trim ram (b) will try to rapidly extend from the cylinder the pressure increases inside the trim cylinder down cavity and connecting passagesThe rise in pressure will seat the check ball (r) inside the suction valve (9)preventing fluid from returning into the reservoi rWhen the pressure increases to