Hartzell HC-D2MV20-3 Series Owner's Manual And Logbook page 132

CAUTION:
(h) Verify that the jack plate is maintaining a correct
distance away from the ring encircling the hub and on
the engine side of the blade arms.
(i) After running the engine at maximum static RPM, shut
the engine down
(j) With the engine stopped, pull the propeller control all
the way out.
(k) Check the clearance between the jack plate and
the ring encircling the hub on the engine side of the
blase arm. The clearance must be a minimum of 0.06
inches (1.5 mm) and a maximum of 0.12 inches
(3.0 mm) for Lycoming engines and exactly 0.12
inches (3.0 mm) for Continental engines.
(l) While static on the ground (engine not running), check
the high pitch travel using the following procedure:
1 Pull the propeller pitch control back to the
movement limit.
2 Grip the counterweights by hand and, at the same
time, rotate the blades to high pitch to force the
hydraulic piston back into the diaphragm.
3 Verify that the valve lever has sufficient travel
to allow the valve spool to be positioned at the
center of its travel while the piston is at the
maximum high pitch position or end of its 0.37
inch (9.5 mm) travel.
NOTE:
INSTALLATION AND REMOVAL
Propeller Owner's Manual
CLEARANCE BETWEEN THE JACK
PLATE AND THE HUB RING OR ANY
PART OF HUB MUST BE MAINTAINED
TO PREVENT EXCESSIVE LOADING
OF THE JACK PLATE-TO-PISTON
THRUST BEARING AND PREMATURE
FAILURE. EXCESSIVE LOAD ON
THE ENGINE NOSE CASE THRUST
BEARING WILL ALSO RESULT.
This check will provide assurance of
full pitch control and RPM range during
flight.
61-00-40
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Page 3-66
Nov/02