Mercury 40 Service Manual page 381

Shock Function Return
After the engine clears the under water object, the weight of the engine will increase the oil
pressure between the memory piston (t) and shock piston (u) to the level required to open
the shock return valve (h), inside the shock piston, allowing the oil to bleed back through
the shock piston into the down cavity. If required, additional oil will enter the down cavity
through the manifold reverse suction valve (o). This will return the engine back against the
memory piston (t) and into the original running position.
a -
b -
c -
d -
e -
g -
h -
k -
m -
n -
o -
p -
q -
s -
u -
v -
w -
90-828631R3 MARCH 1999
Trim Rod
End Cap
Electric Motor
Reservoir Oil
Down Circuit Pressure Relief Valve
f - Down Circuit Pressure Operated Valve
Filter (2 shown for clarity)
Shock Return Valve
i - Up Circuit Suction Port
j - Oil Pump Gears
Down Circuit Suction Port
l - Oil Fill Cap
Shuttle Valve
Up Circuit Pressure Operated Valve
Manifold Reverse Suction Valve
Manual Release Valve
Manifold
r - Tilt Relief Valve
Tilt Relief Piston
t - Memory Piston
Shock Piston
Impact Relief Valve
Cylinder
POWER TRIM
Page 5C-19