Hartzell HC-E4 3 Series Owner's Manual page 190

(c) Grease Leakage - probable causes:
1 Loose/defective lubrication fitting
2 Faulty seal at the blade socket between the
blade and the hub
a Refer to a certified propeller repair
station with the appropriate rating for seal
replacement.
3 Leakage from the hub and beta rod interface
(if applicable)
a Over-greased hub
(1) Refer to a certified propeller repair
b Faulty seal
(1) Refer to a certified propeller repair
4 Cracked hub
(d) Oil Leakage - probable causes:
1 Leaks between the hub and cylinder
a Faulty or missing seal between the hub and
the cylinder
(1) Refer to a certified propeller repair
2 Leaks between the hub halves, beta rods and
hub
a Faulty seal(s) between the hub and the pitch
change rod
(1) Refer to a certified propeller repair
INSPECTION AND CHECK
Propeller Owner's Manual
147
station with the appropriate rating
for grease removal.
station with the appropriate rating for
seal replacement.
station with the appropriate rating
for seal replacement.
station with the appropriate rating
for seal replacement.
61-00-47
Page 5-20
Rev. 17 Sep/20