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 TM 9-2350-238-20-1
(3) Tightening. Tighten nuts, bolts,
screws, and other types of fasteners with a
torque wrench to the value listed in the mainte-
Equipment operation is allowable with
nance manual. Do not over tighten; this may
minor leakages (Class I or II). Of
strip threads and break off the part being tight-
course, you must consider the fluid
ened.
capacity in the item/system being
checked/inspected. When in doubt,
(4) Repairing. Repair includes inspect-
notify your supervisor. When operat-
ing with Class I or Class II leaks, con-
ing, cleaning, preserving, adjusting, replacing,
welding, riveting, strengthening, and other tasks
tinue to check fluid levels as required
in your PMCS. Class Ill leaks must
associated with putting parts in working condi-
be repaired.
tion.
NOTE
(a) Inspect for burrs, cracks, gouges, or
Fluid leaks affect vehicle status.
nicks.
Learn the following classes of fluid
leaks for unit PMCS.
(b) Replace bent, broken, or stripped
bolts, nuts, screws, and washers. Bolts,
Class I- Seepage of fluid (as indicated by wet-
screws, and nuts may be loose if rust, chipped
ness or discoloration) not great enough
paint, or bare metal is around them. Tighten
to form drops.
loose screws, bolts, and nuts. Replace missing
parts.
Class II- Leakage of fluid great enough to form
drops but not enough to cause drops
(c) Look for bad welds where chipped
to drip from item being checked.
paint, rust, or gaps are present. Have bad
welds repaired.
Class Ill-Leakage of fluid great enough to form
drops that fall from the item being
(d) Look at electric wires for cracked,
checked. Class Ill leaks should be
frayed, loose, discolored, or broken insulation.
reported to your supervisor or direct
Replace bad parts and tighten loose clamps
support maintenance.
and connectors.
(5) Corrosion. Check for signs of deteri-
NOTE
oration, rust, unusual cracking, softening, swell-
When tightening fittings, always hold
ing, or breaking on entire M578 Recovery Vehi-
fitting adapter with one wrench and
cle. Become familiar with the four stages of
tighten nut with another wrench until
corrosion listed below, and take the appropriate
snug. Tighten nut around 1/6-turn to
required maintenance action outlined below.
1/3-turn. If fitting leaks, unscrew nut
a full turn and retighten it. If still leak-
Red, black, or white corrosion de-
Stage 1-
ing, replace leaking parts.
posits on surface with etching or
pitting. However, base metal is
(e) Look at hose, fluid lines, and tubes
sound.
for bends, wear, cracks, or leaks. Replace bad
parts. Make sure all clamps and fittings are
Powdered granular or scaled condi-
Stage 2-
tight. If a fitting leaks, tighten it.
tion. Base metal is sound.
2-15
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