Mercury 40 Service Manual page 330

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 (e) and shock piston (d) to the level required to open
the shock return valve (v), 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 suction valve (g). This will return the engine back against the memory piston (e) in to
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
Electric Motor
Trim Rod
Impact Relief Valve
Shock Piston
Memory Piston
f - Manifold
Suction Valve
Down Circuit Pressure Operated Valve
i - Tilt Relief Actuator
j - Manual Release Valve
Tilt Relief Valve
l - Up Circuit Pressure Operated Valve
Down Circuit Feed Check Ball
Oil Pump Gears
Up Circuit Feed Check Ball
Shuttle Valve
Down Circuit Pressure Relief Valve
r - Check Ball
Reservoir Oil
t - Oil Reservoir
Oil Fill Cap
Shock Return Valve
Filter
POWER TRIM
Page 5B-21