POWER TRIM
90-828631R3 MARCH 1999 Page 5C-11
Tilt Up
In the up mode, as the trim rod (a) extends from the cylinder (w), the memory piston (t) clears
or uncovers the pressure relief passage. Oil from the up cavity will enter this passage and,
if required, causes the tilt relief piston (s) to open the tilt relief valve (r). This valve lowers
the amount of pressure available to lift the outboard motor. With the engine in forward gear,
and at high engine rpm, the oil pressure available will not be able to overcome the propeller
thrust, limiting the trim range to below the pressure relief orifice. When the engine rpm
decreases or if engine is not in forward gear, the oil pressure is available to extend the trim
rod (a) up into the tilt range.
a-Trim Rod
b-End Cap
c-Electric Motor
d-Reservoir Oil
e-Down Circuit Pressure Relief Valve
f-Down Circuit Pressure Operated Valve
g-Filter (2 shown for clarity)
h-Shock Return Valve
i-Up Circuit Suction Port
j-Oil Pump Gears
k-Down Circuit Suction Port
l-Oil Fill Cap
m-Shuttle Valve
n-Up Circuit Pressure Operated Valve
o-Manifold Reverse Suction Valve
p-Manual Release Valve
q-Manifold
r-Tilt Relief Valve
s-Tilt Relief Piston
t-Memory Piston
u-Shock Piston
v-Impact Relief Valve
w-Cylinder
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