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GENERAL PROCEDURES. - TM-9-2350-238-20-20027
Up
TM-9-2350-238-20-2 Crane (CAB) Components Recovery Vehicle Full-Tracked: Light Armored M578 (
Next
TOOLS AND SUPPLIES
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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