Hartzell HC-E4 3 Series Owner's Manual page 195

(e) Install propeller unfeathering tool TE316 or
equivalent.
WARNING:
1 Turn the threaded rod of the unfeathering tool
TE316 onto the end of the pitch change rod as far
as possible.
a Tighten the threaded rod until it is snug.
2 Put the cylindrical portion of the unfeathering tool
TE316 over the threaded rod and put it on top of
the cylinder.
a Put the notch that is in the bottom of the
unfeathering tool TE316 over the stop plate
on top of the cylinder.
3 Install the 1-1/2 inch nut onto the threaded rod of
the unfeathering tool TE316.
a Turn the 1-1/2 inch nut until it touches the
thrust bearing.
b Continue turning the nut until the blades
move to low pitch.
INSPECTION AND CHECK
Propeller Owner's Manual
147
TIGHTEN THE THREADED
ROD UNTIL IT IS SNUG.
THE FEATHERING SPRING
IS PRELOADED WITH
APPROXIMATELY 600 LBS.
(271.8 KG) OF FORCE. FAILURE
TO TIGHTEN THE THREADED
ROD ONTO THE PITCH
CHANGE ROD CAN CAUSE
THE FEATHERING SPRING TO
RELEASE WHEN MOVING THE
BLADES BACK TO FEATHER.
THIS CAN CAUSE PROPELLER
DAMAGE, SERIOUS INJURY AND/
OR DEATH.
61-00-47
Page 5-25
Rev. 17 Sep/20