TM 1-1520-238-23
5-208.14
Change 5
5.46C.
MAIN ROTOR LOWER BEARING GREASE REPACKING (AVIM) – continued
NOTE
If bearing rollers or head outside race
is unserviceable, then main rotor head
is unserviceable.
Manufacture radius scribes in accor-
dance with TM 55-1500-322-24.
c. Check cage between rollers and all relief radii
for cracks (TM 55-1500-322-24). None allowed.
d. Check outer race, inner race, rollers, and
bearing surfaces for cracks, inclusions, and
spalling (TM 55-1500-322-24). None allowed.
e. Check non-functional surfaces for pitting/cor-
rosion (TM 55-1500-322-24).
(1) Damage not to exceed three 0.060 INCH di-
ameter pits maximum in any 0.25 SQUARE
INCH diameter area, not to exceed depth of
0.015 INCH maximum. Use 0.060 radius
scribe.
f. Check rollers and bearing race surfaces for
pitting/corrosion (TM 55-1500-322-24).
(1) Damage not to exceed one 0.025 INCH diam-
eter pit maximum in any 1.0 INCH diameter
area. Use 0.060 radius scribe.
g. Check rollers and bearing race surfaces for
circumference
and
axial
scratches
(TM 55-1500-322-24).
(1) Circumference scratches not to exceed width
of 0.020 INCH maximum and length of 0.5
INCH maximum in any 1.0 INCH diameter
area. Use 0.050 radius scribe.
(2) Axial scratches are not allowed.
h. Check rollers and bearing race surfaces for
indentations (TM 55-1500-322-24).
(1) Damage not to exceed one indent, width of
0.030 INCH maximum and length of 0.080
INCH maximum in any 1.0 INCH diameter
area. Use 0.080 radius scribe.
GO TO NEXT PAGE
M04-5196-6
BETWEEN
ROLLERS
LOWER BEARING ROLLER/CAGE
ROLLER
RELIEF
RADII
