Hartzell HC-E3YR-7 Owner's Manual page 124

(g) The preloaded spring in the hub that is between
the propeller blades and the engine flange, must
be overcome by the propeller oil pressure before
the blades will move from low pitch to lower blade
angles in the beta range. Refer to Figure 2-2,
"Pressure Control Reversing Propeller System" in
the Description and Operation chapter of this manual
and Position 2 in Figure 3-16.
(h) When at low pitch blade angle position it is
possible to be at many oil pressures ranging from
Position 1 (increasing pitch from low pitch) to
Position 2 (decreasing blade pitch into beta range).
Refer to Figure 3-16.
(i) The plunger stop screw is to be adjusted to get an
oil pressure at Position 3 that is 10 to 20 psi above
the oil pressure that it takes to reach low pitch
position during decreasing pitch, which is shown
as Position 4. Refer to Figure 3-16.
(j) The installed cockpit mounted oil pressure gauge is
shown in Figure 2-2, "Pressure Control Reversing
Propeller System" in the Description and Operation
chapter of this manual and discussed in the
Description and Operation chapter.
1
2
INSTALLATION AND REMOVAL
Propeller Owner's Manual
The pressure range recommended is
0 to 300 psi.
The purpose is to monitor that the oil pressure
reduction value is still at Position 3 before
each flight.
a This is to make sure that the governor has
sufficient oil pressure available for blade
angle control during governed flight and that
the oil pressure is not so high, oil pressure
above Position 2, that accidental entry into
beta range might occur.
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Rev. 2 Feb/17