TM 5-3895-373-34
2.68
REPLACE AUGER BEARING UNITS, SHAFT, AND SPROCKET WHEEL - Continued
C.
INSPECT.
1.
INSPECT SHAFT.
a.
Visually inspect shaft for straightness. Roll shaft
across a clean level surface. Check for out-of-
roundness. Replace shaft if bent or out-of-
round.
b.
Inspect bearing surfaces A on shaft for scoring
and gouging. Replace shaft if scoring or
gouging is detected.
c.
Use outside micrometer and measure bearing
surface diameters (A) on shaft. Bearing surface
diameters on shaft should measure between
1.873 and 1.875 in. (47, 57 and 47, 62 mm). If
bearing surface diameters on shaft measure less
than 1.873 in. (47, 57 mm), replace shaft.
d.
Inspect sprocket wheel surface B on shaft for
scoring or gouging. Replace shaft if scoring or
gouging is detected.
e.
Use outside micrometer and measure sprocket
wheel surface (B) on shaft for wear. Sprocket
wheel surface diameter on shaft should measure
between 1.438 and 1.439 in. (36, 52 and 36, 55
mm). If sprocket wheel surface diameter on
shaft is less than 1.438 in. (36, 52 mm), replace
shaft.
f.
Inspect shaft keyway C for damage. Replace
shaft if keyway is visibly damaged.
2.
INSPECT BEARINGS.
a.
Spin bearing by hand.
b.
If bearing does not spin freely, or radial free play
is detected, discard and replace ball bearing unit.
3.
INSPECT SPROCKET WHEEL.
a.
Inspect sprocket wheel (3) for broken, missing,
and worn teeth D. Replace damaged sprocket
wheel.
b.
Inspect sprocket wheel (3) keyway E for worn or
broken edges. Replace sprocket wheel if
keyway is worn or damaged.
c.
Inspect sprocket wheel (3) for stripped or
damaged set screw threads F. Replace
sprocket
wheel
if
set
screw
threads
are
damaged.
d.
Using a slide caliper measure the inside
diameter G of sprocket wheel (3). The inside
diameter should measure between 1.438 and
1.439 in. (36,52 and 36,55 mm). If the inside
diameter is more than 1.439 in. (36,55 mm),
replace sprocket wheel.
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