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 TM 55-1905-219-14-10
5-19.2. IDLER GEAR - MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
TEST
5.
a. Prior to installing and securing
the bearing retainer, check the
pre-load of the bearing assembly.
b. The rollers in the bearing are
loaded between the bearing cup and
the bearing cones in accordance
with design requirements to provide
a rigid idler gear and bearing
assembly. As the bearing cones are
moved toward each other in a tapered
roller bearing assembly, the rollers
will be more tightly held between
the cones and the cup. In the idler
gear bearing, a slight pre-load is
applied by means of a selected
spacer ring between the bearing
cones, to provide rigidity of the
gear and bearing assembly when it is
mounted on its hub. This method of
pre-loading is measured, in terms of
"pounds-pull", by the effort required
at the outer diameter of the gear to
turn the bearing cup in relation to
the bearing cones.
c. Check the bearing pre-load whenever
the idler gear assembly is removed
from the engine for service or for
an engine overhaul.
d. The idler gear bearing must be clean
and lubricated with engine oil
before checking the pre-load. If a
new bearing has been installed,
"work in" the bearing by rotating
the gear back and forth several
times.
5-350
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