90-826148R2 MARCH 1997 MID-SECTION - 5B-17
SHOCK FUNCTION UP
Oil inside the down cavity is locked in a static position
by the closed pressure operated valve (h), the manu-
al release valve (j) and the tilt relief valve (k). If the
outboard strikes an underwater object while in for-
ward gear the trim ram (b) will try to rapidly extend
from the cylinder , the pressure increases inside the
trim cylinder down cavity and connecting passages.
The rise in pressure will seat the check ball (r) inside
the suction valve (g), preventing fluid from returning
into the reservoir. When 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 piston. As the fluid
passes through the piston, the trim ram (b) will extend
from the trim cylinder. The memory piston (e) 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 trim ram piston is trapped be-
tween the memory piston (e) and shock piston (d).
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