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 TM
9-2350-238-20-2
2-7.1
GENERAL
PROCEDURES
(CONT).
(2) Servicing. This
usually
means
drain-
Equipment
operation
is
allowable
ing and refilling units with oil and changing or
l or l l ) .
with minor leakages (Class
cleaning oil
filters,
fuel
filters,
and
air
Of course, you must consider the
cleaners.
fluid capacity in the item/system
being checked/inspected. When in
(3) Tightening. Tighten nuts, bolts,
doubt,
notify
your
supervisor.
screws, and other types of fasteners with a
When operating with Class I or
torque wrench to the value listed in the
Class II leaks, continue to check
maintenance manual. Do not over tighten;
fluid levels as required in your
this may strip threads and break off the part
PMCS. Class lll leaks must be
being
tightened.
repaired.
(4) R e p a i r i n g . R e p a i r
includes
inspecting,
NOTE
cleaning, preserving, adjusting, replacing,
Fluid leaks affect vehicle status.
welding, riveting, strengthening, and other
Learn the following classes of
tasks associated
with
putting
parts
in
working
fluid leaks for unit PMCS.
condition.
Class l- Seepage of fluid (as indicated by
(a) Inspect
for
burrs,
cracks,
gouges,
wetness or discoloration) not great
or nicks.
enough
to
form
drops.
(b) Replace bent, broken, or stripped
Class ll- Leakage of fluid great enough to
bolts, nuts, screws, and washers. Bolts,
form drops but not enough to cause
screws, and nuts may be loose if rust,
drops to drip from item being
chipped paint, or bare metal is around them.
checked.
Tighten loose screws, bolts, and nuts.
Replace missing parts.
Class Ill-Leakage of fluid great enough to
form drops that fall from the item be-
(c) Look
for
bad
welds
where
chipped
ing checked. Class Ill leaks should be
paint, rust, or gaps are present. Have bad
reported to your supervisor or direct
welds repaired.
support
maintenance.
(d) Look at electric wires for cracked,
Corrosion. Check for signs of
(5)
frayed, loose, discolored, or broken insulation.
deterioration, rust, unusual cracking, soften-
Replace bad parts and tighten loose clamps
ing, swelling, or breaking on entire M578
and
connectors.
Recovery Vehicle. Become familiar with the
four stages of corrosion listed below, and
NOTE
take the appropriate required maintenance ac-
When
tightening fittings,
always
tion outlined below.
hold fitting adapter with one
wrench and tighten nut with
Stage 1 - Red, black, or white corrosion
another wrench until snug.
deposits on surface with
Tighten
nut
around
1/6-turn
to
etching or pitting. However,
1/3-turn.
If
fitting
leaks,
unscrew
base metal is sound.
nut a full turn and retighten it. If
still leaking, replace leaking parts.
Stage 2 - Powdered granular or scaled
condition. Base metal is sound.
(e) Look at hose, fluid lines, and tubes
for bends, wear, cracks, or leaks. Replace
bad parts. Make sure all clamps and fittings
are tight. If a fitting leaks, tighten it.
Change 1
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