90-826148R2 MARCH 1997 MID-SECTION - 5B-9
TRIM UP
When the trim switch is activated in the up position,
the electric motor (a) begins to rotate the pump gears
(n), the oil pump draws a small amount of oil through
the filter, up circuit pick–up and past the feed valve
check ball (o). The oil pump gear (n) rotation forces
oil into the passages for the up circuit. Oil, under
pressure, will slide the shuttle valve (p) against the
down circuit pressure operated valve (h). The shuttle
valve will mechanically open the down pressure op-
erated 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 re-
quired for the up circuit. Oil in the up circuit is blocked
from returning into the reservoir (t) by the ball inside
the down circuit feed valve (m). The pressure of the
oil will force the up circuit pressure operated valve (l)
to open, allowing the oil to enter the passages inside
the manifold (f) leading to the trim cylinder up cavity.
Oil is blocked from all other passages by the closed
manual tilt valve (j) and closed tilt relief valve (k). Oil
under pressure will enter the trim cylinder below the
memory piston (e). With an increasing amount of oil
entering the cylinder, the memory piston contacts the
shock piston (d) and forces the trim rod (b) 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 enters the manifold
passages. Inside the manifold the oil seats the ball
(r) inside the suction valve (g), closing the passage
into the reservoir. The oil is drawn back into the pump
(n) through the open pressure operated valve (h) and
enters the pump as supply for the up circuit.
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