Propeller Owner’s Manual
140
INSTALLATION AND REMOVAL
61-00-40
Page 3-26
Rev. 2 Jun/12
(2) Model HC-D3(MV,V)20-6L Hydraulic Valve Installation.
(a) If not previously installed, install the hydraulic valve
assembly 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.
CAUTION:
THE HOSE MUST BE LONG ENOUGH
TO ALLOW THE VALVE TO MOVE
FREELY WITH THE PISTON THROUGH
ITS FULL TRAVEL.
(c) 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 closest to the propeller (the
pressure supply port).
(d) 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: 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 to be
connected is for positive blade pitch control
to control RPM in flight.
(e) Secure the control cable clamping bolt tightly against
the bracket on the cylinder.
NOTE: There should be an increase in cable
tension when moving the cockpit reverse
control into the locked position (slack is
taken up in the cable).
Summary of Contents for HC-D2MV20-3 Series
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