POWER TRIM
90-857046R1 NOVEMBER 2001 Page 5B-17
Shock Function Up
Oil inside the down cavity is locked in a static position by the closed down circuit pressure
operated valve (f), the manual release valve (p) and the manifold reverse suction valve (o).
If the outboard strikes an underwater object while in forward gear, the piston rod (a) will try
to rapidly extend from the cylinder (w), and the pressure increases inside the trim cylinder
down cavity and connecting passages. When the pressure increases to the level required,
the impact relief valves (v), located inside the shock piston (u), will open and allow the fluid
to pass through it. As the fluid passes through the piston, the piston rod (a) will extend from
the trim cylinder. The memory piston (t) is held in position by vacuum, created by the oil in
the up cavity being locked in a static position. Therefore, oil passing through the shock pis-
ton is trapped between the memory piston (t) and shock piston (u).
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