Mercury 40 Service Manual page 322

Tilt Up
In the up mode, as the trim rod (b) extends from the cylinder, the memory piston (e) clears
or uncovers the pressure relief passage. Oil from the up cavity will enter this passage and
open the tilt pressure relief valve (k). 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 pres-
sure available will not be able to overcome the propeller thrust, limiting the trim range to be-
low 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 (b) up into the tilt range.
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-13