Hartzell HC-D2MV20-3 Series, Owner'S Manual And Logbook

Page: 141 / 204

Propeller Owner’s Manual
140
INSTALLATION AND REMOVAL
61-00-40
Page 3-75
Rev. 2 Jun/12
(c) Remove the screws and washers from the inner and
outer rings that retain the diaphragm to the cylinder.
(d) Remove the inner and outer rings that retain the
diaphragm.
(e) Remove the four socket head cap screws that retain
the cylinder to the engine case.
(f) Place the hydraulic unit piston and cylinder and
associated parts on a cart for transportation.
D. Removal of the HC-D(2,3)(MV,V)20-8( ) Propeller Assemblies
(1) Propeller Removal
CAUTION: TO PREVENT DAMAGE TO THE BLADE
AND BLADE PAINT, WRAP THE BLADE
SHANKS IN SEVERAL LAYERS OF
MASKING OR DUCT TAPE BEFORE
REMOVING THE SPINNER DOME (IF
INSTALLED).
(a) Spinner dome removal (if installed):
1 Remove the screws and washers that secure the
spinner to the spinner bulkhead.
2 Remove the spinner dome.
(b) On non-governing propellers only, disconnect the
propeller pitch control cable from the hydraulic valve
lever on the long end that extends from the valve
spool.
(c) Remove the hub nut safety pin from the hub nut.
(d) Completely loosen and unthread the hub nut from the
engine shaft threads.
NOTE: Because the hub nut is pulling the propeller
hub off the tapered rear cone, there will be
significant resistance to the loosening of the
shaft nut.
(e) Grip the blade counterweight on each blade clamp
and rotate the blades to high pitch
(f) Rotate the blades until the push rods that protrude
from the jack plate unit slide out of each of the guide
lug bushings on the hub.
(g) Rotate the jack plate unit to allow each fork to
disengage each pitch change block.