Mercury 40 Service Manual page 375

Maximum Tilt
With the trim rod at maximum travel, and due to no rod movement, the pressure inside of
the trim cylinder (w) will increase to the pressure required to move the tilt relief piston (s).
The tilt relief piston's "pin" opens the tilt relief valve (r). Up pressure flows allowing the oil
to flow into the trim relief passage, and returns back into the reservoir.
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-13