TM 55-1520-240-23-4
5-61.1
REPLACE INBOARD DAMPNER UPPER LUG BUSHING
(Continued)
5-61.1
1.
Using heat gun heat the upper lug (2) on the
pitch housing assembly (1) for a maximum of 30
minutes.
2.
Remove bushing (3) from lug (2) discard bushing.
NOTE
Do not use petroleum based cleaning
solvent.
3.
Using a clean cloth (E120) wet with acetone
(E20), clean upper lug bushing bore (4).
4.
Inspect the upper lug bore (4) for fretting and
cleanliness.
NOTE
Do not use petroleum based cleaning
solvent.
5.
Using scotch-brite (E2) wet with acetone (E20)
lightly polish upper lug bushing bore (4) to
remove debris or fretting.
6.
Touch-up reworked area with brush alodize
(Chemical Film Coating) (E113).
7.
Measure the upper lug bushing bore (4) at two
points 90º apart. One reading shall be taken
parallel to blade. Maximum dimension for bore
(4) is 0.9362 inch maximum.
NOTE
Do not use petroleum based cleaning
solvent.
8.
Clean bushing (5) outside diameter and bolt/
bushing (6) using a clean cloth (E120) wet with
acetone (E20).
Wear protective gloves when handling
frozen or heated parts.
NOTE
Air dry primer/activator for 5 minutes
prior to application of locking
compound.
5-266