Hartzell HC-D2MV20-3 Series Owner's Manual And Logbook page 185

CAUTION:
(3) Pump grease into each blade clamp lubrication fitting
until grease emerges from the hole of the removed
lubrication fitting.
NOTE: Lubrication is complete when grease emerges
in a steady flow with no air pockets or
moisture, and has the color and texture of the
new grease.
(4) Reinstall the removed lubrication fitting on each clamp.
(5) Tighten the lubrication fittings until snug.
(a) Make sure the ball of each lubrication fitting is
properly seated.
(6) Install new lubrication fitting caps on each lubrication
fitting.
Maintenance Practices
Propeller Owner's Manual
DO NOT USE AN AIR ASSISTED GREASE
GUN TO LUBRICATE THE PROPELLER.
140
61-00-40
Page 6-7
Rev. 2 Jun/12