Hartzell HC-D2MV20-3 Series Owner's Manual And Logbook page 118

(n) Check the travel of the piston.
1 Grip the blade counterweights and, at the same
time, rotate to linearly move the jack plate and
piston.
2 Travel should be 0.375 inch (9.52 mm) or 0.187
inch (4.75 mm) on either side of the neutral
position of the diaphragm.
3 If the distance is not sufficient, remove the
propeller and install or remove shim(s) between
the rear cone and the engine to obtain the
desired travel capability.
(o) Using a hub nut safety pin, safety the hub nut to the
engine shaft. Refer to Table 3-1.
NOTE:
(4) Connecting the Propeller Pitch Control Cable to
Hydraulic Valve Lever
(a) Position the piston in forward position (toward
propeller).
NOTE:
(b) Position the valve spool approximately 0.37 inch (9.5
mm) from the valve link tab (near mid position).
(c) Pull the cockpit propeller pitch control knob back
approximately 0.12 inch (3.0 mm).
(d) Connect the propeller pitch control cable to the lever
that extends from the hydraulic valve.
(5) Adjusting the Propeller Control for Proper Ground or
Static RPM
(a) Start the engine and allow it to warm up.
(b) Check the propeller action with the propeller pitch
control (RPM control).
(c) Set the pitch control to provide maximum RPM on
the ground.
INSTALLATION AND REMOVAL
Propeller Owner's Manual
140
The hub nut safety pin is normally
supplied in a bag when the propeller is
shipped new from the factory.
When in the forward position, the piston
should extend 0.12 inch (3.0 mm) out in
front of the outer ring. When in neutral
position, the piston should be 0.06 inch
(1.5 mm) behind the face of the outer ring.
61-00-40
Rev. 3 Feb/14
Page 3-54