Hartzell HC-82XF-1 Owner's Manual page 193

(2) Oil Leakage - Probable Cause
(a) Faulty O-ring seal between the hub and the cylinder.
(b) Faulty O-ring seal between the piston and the
cylinder.
(c) Displaced felt seal between the piston and the
cylinder
(d) Faulty O-ring between the propeller hub and the
engine flange.
(e) Faulty O-ring between the piston and the pitch
change rod.
(3) Beta System Oil Leakage - Probable Cause
(a) Governor leaks oil. (Refer to an appropriately
licensed propeller repair facility)
(b) Faulty gasket between the governor and beta valve,
or the beta valve and the engine. Replace the
gasket.
(c) Faulty O-rings between the beta valve body and the
beta valve spool. (Refer to an appropriately licensed
propeller repair facility for replacement).
TESTING AND TROUBLESHOOTING
Propeller Owner's Manual
175
61-00-75
Page 4-15
Rev. 1 Jun/11