Hartzell HC-E3YR-7 Owner's Manual page 123

(d) Figure 3-16 shows propeller control oil pressures
that are required between the blade angle ranges of
high pitch and maximum reverse pitch.
1
2
(e) Between low pitch and high pitch there are two
straight sloped lines that are parallel to each other.
Refer to Figure 3-16.
1
2
3
4
(f) The plunger stop screw must be adjusted get a
pressure that is 10 to 20 psi above the low pitch
oil pressure that was obtained during a decrease
pitch movement of the propeller blades. Refer to
Position 3 in Figure 3-16.
INSTALLATION AND REMOVAL
Propeller Owner's Manual
The horizontal axis represents the blade angle
of the propeller.
The vertical axis represents the magnitude of oil
pressure required for propeller control.
The lower line represents the oil pressure that
is required for propeller control when the blade
angle is increasing.
The upper line represents the oil pressure that
is required for propeller control when the blade
angle is decreasing.
The different oil pressures that are required for
propeller control at the same blade angle when
increasing or decreasing blade angle is caused
by friction involved in moving the propeller pitch
change components.
The oil pressure between low pitch and high
pitch, which changes, is caused by the
springs in the cylinder of the propeller. Refer
to Figure 2-2, "Pressure Control Reversing
Propeller System" in the Description and
Operation chapter of this manual.
136
61-00-36
Page 3-47
Rev. 2 Feb/17