MOONEY INTERNATIONAL CORPORATION
M20V SERVICE AND MAINTENANCE MANUAL
Date
MAR 2017
Rev Date
Page
8
tended after evaluation of previous propeller overhauls
with regard to bearing wear and internal corrosion.
-NOTE-
Hartzell recommends that new or newly over-
hauled propellers be lubricated after the first one
or two hours of operation because centrifugal
loads will pack and redistribute grease, which
may result in a propeller imbalance. Redistribu-
tion of grease may also result in voids in the
blade bearing area where moisture can collect.
LUBRICATION PROCEDURE
-CAUTION-
Follow lubrication procedures correctly to
maintain an accurate balance of the propeller
assembly.
1. Remove the propeller spinner.
2. Each blade socket has two (front and rear) lubrica-
tion fittings. Remove the lubrication fitting caps from
both sides of the hub assembly. Remove the lubrication
fittings from either the cylinder side or the engine side of
the hub assembly. It is preferable to apply grease to the
fitting located nearest the leading edge of the blade.
Greasing at this location reduces the possibility of
grease bypassing the bearing area and entering the
hub cavity.
3. Use a piece of safety wire to loosen any blockage
or hardened grease at the threaded holes where the lu-
brication fitting was removed.
To completely replace one grease with another, the
propeller must be disassembled in accordance with the
applicable Hartzell overhaul manual.
-CAUTION-
Over lubricating may cause the grease to enter
the hub cavity, leading to excessive vibration
and/or sluggish op eration. The propeller must
then be disassembled to remove this grease.
-CAUTION-
If a pneumatic grease gun is used, extra care
must be taken to avoid excessive pressure
buildup.
-CAUTION-
Grease must be applied to all blades of a pro-
peller assembly at the time of lubrication.
-CAUTION-
Use Hartzell propeller approved grease only.
Do not mix different specifications and/or
brands of grease.
-NOTE-
A label indicating the type of grease used for pre-
vious lubrication is installed on the propeller cyl-
inder. If the propeller must be lubricated with
another type of grease, the propeller must be dis-
assembled and cleaned of old grease before relu-
bricating.
4. Pump 1 fl. oz. (30 ml) grease into the fitting located
nearest the leading edge of the blade or until grease
emerges from the hole where the fitting was removed -
whichever occurs first.
-NOTE-
1 fl. oz. (30 ml) is approximately six pumps with a
hand- operated grease gun.
5. Reinstall the removed lubrication fittings. Torque
thefittingsto50in-lbs(5.6Nm).
-NOTE-
Make sure the ball of each lubrication fitting is
properly seated.
6. Install a new lubricap on each lubrication fitting.
The following lubricants are approved for use in Hart-
zell propellers. Refer to Hartzell Propeller Owner’s
Manual for ambient operating temperature limitations:
Aeroshell 6 (Recommended “all purpose” grease)
Aeroshell 5
Aeroshell 7
Aeroshell 22
Exxon 5114EP
Royco 22C
61-10-00
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