OPERATION AND INSTALLATION MANUAL
EN-1320
5.4
Installing the Blades into the Hub (except model AV-844)
a) Observe the label located on the blade. When installing the blade into the hub, make sure
that position number on the label corresponds with the number stamped on the hub, at
the bushing where the blade will be installed. See Figure 5-1.
CAUTION: IT IS IMPORTANT TO INSTALL THE BLADES INTO THEIR MATCHING
BUSHINGS IN THE HUB. OTHERWISE VIBRATIONS MAY OCCUR,
RESULTING IN DAMAGE TO THE ENGINE.
FIGURE 5-1
b) Check that o-ring is installed on the blade shank. See Figure 5-2. This o-ring is usually
installed on the shank when the blades are delivered for initial instalation.
NOTE: The o-ring prevents moisture to get into the blade bushing. Otherwise corrosion
of the blade and blade bushing may occur. This can cause the blade and blade
bushing will be scrapped at overhaul.
c) Make sure that blade shank and inside of the blade bushing are clean and dry. Clean with
lint-free cloth, either dry or lightly dampened in MEK, as necessary.
CAUTION: AVOID CONTACT OF THE O-RING WITH CLEANING SOLVENT.
d) Lightly grease the blade thread with Aeroshell Grease 5, 6 or 22.
CAUTION: DO NOT GREASE THE CLAMPING PORTION OF THE BLADE SHANK,
SEE FIGURE 5-2. IT MAY DECREASE CLAMPING ACTION LEADING
TO CHANGE OF BLADE ANGLE SETTING IN OPERATION.
e) Make sure that the blade clamp is fully released.
f) Slowly screw the blade into blade bushing until is fully screwed in. Then turn the blade
back to align the position mark on the blade with matching mark on the blade bushing.
See Figure 5-3.
g) Position the clamp so that pin in the blade bushing is in center of the gap. See Figure 5-4.
61-10-20
INSTALLATION AND OPERATION INSTRUCTION
Page 5-2
2019-03-04
