PS Magazine - TB 43-PS-674
PS, The Preventative Maintenance Monthly
ISSUE 674
JANUARY 2009
8
PS 674
JAN 09
9
PS 674
JAN 09
That’s why it pays to keep a close watch on the screws that hold the rear door latch
mechanism in place.
Vibration and everyday wear and tear can loosen the screws. If they work loose,
the latching bar can fall across the doors. The few extra seconds it takes to move the
bar can be critical.
So take a look at the screws during PMCS. If they’re loose or one is missing,
notify your mechanic. He’ll replace missing screws, NSN 5305-00-071-2073, and
re-tighten loose ones.
C
rewmen, does your howitzer or ammo carrier have exhaust leaks in the engine
compartment?
If so, the culprit could be a worn-out exhaust deflector packing. It’s supposed to
plug up the space between the deflector and the end of the engine exhaust pipe.
Once
the
packing
is
worn
enough, you’ll get exhaust leaks
in the engine compartment. That’s
a dangerous problem.
Replace that packing when you
start seeing leaks. A new packing
comes with NSN 5330-01-382-
4272. Use the whole packing to
Fll the gap between the deflector
and the hull mount.
If the seal support is bent so the deflector won’t seat right, replace it. Use NSN
2990-00-894-0075 for a new support.
Make sure the cap screws that hold the
deflector snug against the packing are
not stripped or cross-threaded. Replace
bad screws with NSN 5305-00-269-
3238. That NSN brings 100 screws.
And when it’s time to pull the
powerpack, make sure you take off
the exhaust deflector Frst. Otherwise,
the deflector gets ripped off when you
remove the deck.
M992A2
Ammo Carrier…
G
o
t
a
S
C
r
e
w L
o
o
s
e?
M109-Series SP Howitzer,
M992A2 Ammo Carrier…
Bad PaCking:
an
Exhausting
Problem
when there’s
an emergency—
like a fire—
you’ll want
to get out
of your ammo
carrier fast.
any delay
can make the
difference
between life
and death.
Screws loose or missing?
Call your mechanic!
I think
our
carrier
has some
screws
loose!
yep!
and they’re
the ones that hold
the rear door
latches in place!
holy cow!
is it a fire?!
no,
you just
didn’t install
new packing
in my exhaust
deflector!
Packing missing
or damaged?
Replace it
Replace damaged or missing screws
674.08-09.indd
1-2
11/22/08
3:14:33 PM
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