Hartzell HC-D2MV20-3 Series Owner's Manual And Logbook page 106

(c) Expose the inner cavity of the cylinder for installation
on the engine case.
1 Remove the screws from the retaining outer ring
of the diaphragm.
2 Remove the outer ring from the diaphragm.
3 Remove the screws from the inner ring of the
diaphragm.
4 Remove the inner ring.
5 Remove the diaphragm.
(2) Hydraulic Valve Installation.
(a) If not previously installed, install the hydraulic valve
assembly (Figure 3-8) on the piston with a gasket and
two screws (Table 3-1).
(b) Using a No. 51 drill, drill through the side of the valve
housing and through the heads of the two A-2038-( )
screws. Safety with 0.032 inch (0.81 mm) safety wire.
Refer to Figure 3-1.
(c) Perform the following three adjustments:
1 Bottom the piston in the cylinder.
2 Pull the propeller control (for pitch and RPM
control) handle out approximately 2.25 inches
(57.1 mm) from the instrument panel.
3 Locate the valve spool midway between the cotter
pin and the base of the guide pin.
(d) Attach the propeller pitch control cable to the
hydraulic valve lever on the long end that extends
from the valve spool.
(e) Safety wire the two screws together with 0.032 inch
(0.81 mm) minimum diameter stainless steel wire.
(f) Install the gasket.
1 Align the clearance holes of the A-135 gasket
with the four mounting studs that protrude from
the engine and install the gasket flush against the
engine case.
INSTALLATION AND REMOVAL
Propeller Owner's Manual
140
61-00-40
Rev. 3 Feb/14
Page 3-42