PS Magazine - TB 43-PS-744
PS, The Preventative Maintenance Monthly
ISSUE 744
NOVEMBER 2014
31
PS 744
NOV 14
WARNING
IF NBC EXPOSURE IS SUSPECTED,
ALL AIR FILTER MEDIA WILL BE
HANDLED BY PERSONNEL WEARING
FULL NBC PROTECTIVE EQUIPMENT.
SEE OPERATOR/MAINTENANCE
MANUALS.
7690-01114-3702
While you’re at
it, check to make
sure the
NBC
warning decal
is
in place.
NSns for the
seals are listed
in TM 9-2350-
264-24P-1 (Jun 11,
w/Ch 1, Jan 13)
for the M1A1…
…and in
TM 9-2350-388-
13&P in IETM EM
0334 (Jun 14)
for the M1A2.
we may be
little
but
we can pack
a
WhalLop!
The decal, NSN
7
690-01-114-3
7
02, warns that
all
air filter system parts must be handled by NBC
personnel if any NBC contamination is suspected,
regardless of whether the precleaner is equipped
with the pulse jet system (PJS) or not.
Also, a
working
precleaner
scavenger
fan
is critical
to keeping
the tank’s
air induction
system up and
running. All it
takes to knock
out the fan is
a small rock
or chunk of
dirt.
if a rock gets
sucked into the
scavenger fan,
it can jam
between the fan
blades and the
housing. The
sudden stop
snaps
the
hollow aluminum
fan shaft.
That means
the fan
stops working.
Dirt, leaves
and other
debris that
collect on the
precleaner
won’t
get
removed.
After that,
the v-packs
get clogged
faster than
normal and
pretty soon
the tank’s out
of business.
Missing seals let
dirt and dust get
sucked inside the
fender skirts.
The engine pulls
the dirt into the
intake system
where it clogs up
the V-packs.
if you’re having
problems with
clogged V-packs,
missing fender skirt
seals
could be
the cause.
Those rubber
strips are there
to
seal
the area
between the skirts
and hull.
All
the seals are important, but pay
special
attention
to the seals at skirts 4, 5 and 6 on
the
left
side of the vehicle.
These seals are closest
to the air intake grills and
can let in the most dirt.
If NBC warning
decal is missing,
order a new one
with NSN 7690-
01-114-3702
Never store
items on top
of air intake
cleaner
…check the the scavenger fan shaft. if it’s
broken,
have your mechanic replace it
pronto!
y’know my v-Packs
are cloGging
Quicker’n usual!
if you’re
getting
a
lot
of these
complaints…
yeah!
mine,
ToO!
Skirt Seals
Also, keep in mind
you
never
want
to store anything
on top of the
air intake cleaner.
Storing items there
cuts off cooling air
to the engine.
Not only that, but
bumps and vibration
during movement
can
damage
the air
intake cleaner.
So store that
extra oil, tools and
BII items
properly
and let the air intake
cleaner do its job.
Nope. No skirt
seal!
Let’s hangout
here, boys!
same
Here!
744 30-31.indd
1-2
10/3/14
4:48 PM
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