POWER TRIM
90-857046R1 NOVEMBER 2001 Page 5B-9
Trim Up
When the trim switch is activated in the up position, the electric motor (c) begins to rotate
the oil 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 pressure operated valve (f). The shuttle valve will mechanically open the down pres-
sure 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 oper-
ated valve (n) to open, allowing 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
release valve (p). Oil under pressure will enter the trim cylinder 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 cylin-
der and enters the manifold passages. The oil is drawn back into the pump (j) through the
open down circuit pressure operated valve (f) and enters the pump as supply for the up cir-
cuit.
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