MID-SECTION - 5E-790-817643R1 DECEMBER 1996
Trim Up
When the trim switch is activated in the “up” position,
the electric motor (c) begins to rotate the pump gears
(j), the oil pump draws a small amount of oil through
the filter (g) and through the up circuit suction port (i).
The oil pump gear (j) rotation forces oil into the pas-
sages for the up circuit. Oil, under pressure, will slide
the shuttle valve (m) against the down circuit pres-
sure operated valve (f). The shuttle valve will me-
chanically open the down pressure operated valve,
allowing oil from the down cavity of the trim cylinder,
to flow into the oil pump. This returning oil, from the
down cavity, will supply most of the oil required for the
up circuit. Oil in the up circuit is blocked from returning
into the reservoir by the ball inside the down circuit
suction port (k). The pressure of the oil will force the
up circuit pressure operated valve (n) to open, allow-
ing the oil to enter the passages inside the manifold
(q) leading to the trim cylinder (w) up cavity. Oil is
blocked from all other passages by the closed manual
tilt valve (p). Oil under pressure will enter the trim cyl-
inder below the memory piston (t). With an increasing
amount of oil entering the cylinder, the memory piston
contacts the shock piston (u) and forces the piston
rod (a) up and out, raising the outboard motor. Oil on
the top of the shock piston exits through a passage
running down along the side of the cylinder and en-
ters the manifold passages. The oil is drawn back into
the pump (j) through the open down pressure oper-
ated valve (f) and enters the pump as supply for the
up circuit.
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