ENSTROM F-28F/280F SERIES MAINTENANCE MANUAL
Rev.
4
MM-4-36
Jun
21/12
4-29. Main Rotor Flapping Bearings
(Figure 4-1, View Q, and Figure 4-2)
4-30. Lubrication – Main Rotor Flapping Bearings
NOTE
Refer to paragraphs 4-20 through 4-22 if the main rotor hub assembly is
equipped with oil lubricated flapping bearings.
A. Purge lubricate the main rotor flapping bearings using the grease fitting located in the
recess of the bottom of the vertical hinge pin (Figure 4-2).
4-31. Tail Rotor Pitch Control Bearing
(Figure 4-1, View N)
4-32. Lubrication – Tail Rotor Pitch Control Bearing
4-33. Lubrication, Preferred Method – Tail Rotor Pitch Control Bearing
NOTE
Purge the needle prior to each use and lubricate the external surface of the
needle with grease to prevent seal damage.
A. Using a 6 cubic centimeter (cc) medical syringe and an 18 gauge hypodermic needle,
inject .5cc of grease into the bearing in two places, approximately 180
q
apart. Carefully insert
the tip of the needle under the lip of the seal where it contacts the inner race of the bearing. The
tip of the needle can be worked under the lip of the seal and into the bearing between the balls.
If the needle does not penetrate between the balls, the needle can be withdrawn and inserted in
another position on the bearing.
B. Wipe the excess grease from the surface of the seal as necessary
4-34. Lubrication, Alternate Method – Tail Rotor Pitch Control Bearing
WARNING
Use caution when removing the seal to prevent from injuring yourself.
A. Using a small flat-blade screwdriver or small knife blade, remove the seal from the
inboard side of the bearing.
B. Hand pack the bearing with grease.
C. Reinstall the seal. Ensure it is properly seated.
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