Hartzell HC-D2MV20-3 Series Owner's Manual And Logbook page 78

(aa) Check the available piston travel by measuring
between the jack plate and the hub shoulder. Travel
should be 1.062 inch to 1.094 inch (26.97 to
27.79 mm). If the distance is not sufficient, remove
the propeller and install additional shims or remove
shims between the rear cone and engine, to obtain
the desired travel capability.
(ab) Safety the hub nut to the engine shaft using a hub nut
safety pin. Refer to Table 3-1.
NOTE:
(ac) Install a 0.37 to 0.50 inch (9.5 to 12.7 mm) inside
diameter (ID) flexible hose, with a minimum pressure
capacity of 150 psi, from the engine oil pressure pump
supply to the hydraulic valve. Connect the hose to
the threaded hole in the valve that is closest to the
propeller. This is the pressure supply port.
(ad) Install a 0.37 to 0.50 inch (9.5 to 12.7 mm) ID flexible
hose from the engine crankcase to the valve.
(ae) With the cockpit reverse pitch control cable forward,
but just short of the locked position, connect the other
end of the cable to the propeller hydraulic valve lever
on the short end that extends from the valve spool.
NOTE:
INSTALLATION AND REMOVAL
Propeller Owner's Manual
The hub nut safety pin is normally supplied
in a bag when the propeller is shipped new
from the factory.
Two cables from two separate cockpit
controls will be attached to opposite ends
of the hydraulic valve lever. The first cable
connected to the hydraulic valve lever is
for reverse control; the second cable is for
positive blade pitch control to control RPM
in flight.
140
61-00-40
Page 3-14
Nov/02