REPLACE/REPAIR AUXILIARY VIBRATION PUMP - Continued
INSPECT PUMP HOUSING.
Gear tracking on inlet (large port) side of
pump housing will create a stepped wear
path. A uniform wear path is normal and
should not be considered reason for
rejecting pump housing.
Visually inspect pump housing (17) interior surfaces A
and B for scoring and grooving of gear paths.
Replace auxiliary vibration pump if scoring or grooves
are found in gear paths.
Inspect seal grooves C on both ends of pump housing
for sharp edges caused by scratches, nicks, or burrs.
Remove sharp edges with emery cloth.
If scratches or nicks cause leakage paths more than
halfway across seal groove, replace auxiliary vibration
INSPECT DRIVE GEARS AND IDLER GEARS.
Drive gear and idler gear teeth are highly
polished. Avoid contact with bare fingers.
Skin oils can erode polished surfaces.
Wear clean cotton or polyester gloves
when handling gears.
Visually inspect drive gear (30) and idler gear (31),
teeth surfaces D and gear faces E, for nicks, chips,
scoring, or discoloration.
Replace drive and idler gears (30 and 31) if any
damage is found on surfaces D or E, or if scoring or
burnishing is found on surfaces F.
Remove small burrs or scratches from surfaces with
emery cloth. Clean gears after polishing. Refer to
Inspect splines G for nicks, chipping, and wear
indicated by rounding of spline teeth. If spline
damage is indicated, replace both the drive and idler
gears (30 and 31).
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