Hartzell HC-D2MV20-3 Series Owner's Manual And Logbook page 115

(i) Pull the cockpit propeller control into full high pitch
and force the piston back to check for washers,
screws, or safety wire that may prevent the piston
arms from touching the outer diaphragm ring B-120 or
high pitch position.
(j) In the high pitch position, the valve spool should
extend 1.31 inch (33.3 mm) or less (preferably less)
beyond the valve body casting.
(k) Run the engine up and check the static RPM.
1 For fine adjustment, replace the low pitch stop
screw.
2 An adjustment of more than 100 RPM may only
be performed by a certified propeller shop.
(3) Adjusting Travel on Hydraulic Unit With Governor
(a) Pull the piston out with the propeller counterweights,
until the piston guide arms extend a maximum of 0.50
inch (12.7 mm) for a 0.125 inch (3.17 mm) diaphragm
or a maximum of 0.44 inch (11.18 mm) for a 0.063
inch (1.59 mm) diaphragm from the outer diaphragm
ring B-120.
(b) On Lycoming engines, the clearance between the jack
plate and any portion of the hub or spinner ring should
be no less than 0.063 inch (1.59 mm) and no greater
than 0.125 inch (3.17 mm). On Continental engines,
the clearance between the jack plate and any portion
of the hub or spinner ring should be exactly 0.125 inch
(3.17 mm).
CAUTION:
(c) Adjust the spacers behind the rear cone to obtain
the applicable clearance. Do not allow the hub nut to
engage less than five full threads. Restrict the travel to
maintain no less than clearance.
INSTALLATION AND REMOVAL
Propeller Owner's Manual
DO NOT ALLOW THE HUB NUT TO
ENGAGE LESS THAN FIVE FULL
THREADS.
140
61-00-40
Rev. 3 Feb/14
Page 3-51