1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 237Get 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 (j) 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 cylinderthe pressure increases inside the trim cylinder down cavity and connecting passagesThe rise in pressure will seat the check ball (r) inside the suction valve (g), preventing fluid from returning into the reservoirWhen the pressure increases to the level required, the impact relief valves (c), located inside the shock piston (d), will open and allow the fluid to pass through the shock pistonAs the fluid passes through the piston, the trim ram (b) will extend from the trim cylinderThe memory piston (e) is held in position by vacuum, created by the oil in the up cavity being locked in static positionTherefore; oil passing through the trim ram piston is trapped between the memory piston (e) and shock piston (d)