PS Magazine - TB 43-PS-720
PS, The Preventative Maintenance Monthly
ISSUE 720
NOVEMBER 2012
6
PS 720
NOV 12
7
PS 720
NOV 12
D
rivers, the personnel ventilator on your M992A2 ammo carrier has two important
jobs. It pulls in cool, outside air to help keep you comfortable and vents dangerous
fumes from the crew compartment—like when the automatic fire extinguisher system
(AFES) is activated.
That’s
why
it’s
important to keep dirt,
leaves and other debris
out of the ventilator
exhaust. If the exhaust
is clogged, there’s no
airflow. And that makes
your vehicle NMC.
At
least
monthly,
remove
the
grille
covering
the
exhaust
and clean out any debris
that has collected. You’ll
breathe much easier for
your efforts.
Dear Half-Mast,
I’ve noticed that a lot of the gun
tubes on our M777A2 howitzers
have started losing their finish. Is it
okay to spray some dry film lubricant
on the worn spots to help keep
corrosion from setting in?
SFC H.J.P.
Dear Sergeant H.J.P.,
Good question! The fnish you see on those gun tubes looks a lot like dry flm
lubricant. However, it’s a
baked-on
fnish that’s designed to adhere to the metal
surFace oF the gun tube.
IF you use spray-on dry flm lubricant, it’ll rub oFF the gun tube surFace during
fring and gunk up under the chase bearing. That just adds to your problems.
PMCS check 31 in TM
9-1025-215-10
is
pretty
specifc about how to handle
those worn spots. Clean the
exposed area with crocus
cloth and then apply a light
coat oF WTR to keep rust
From setting in.
IF you work in a desert
environment, however, you’ll
have to go one step Further.
WTR attracts sand like a magnet. So beFore fring the gun, wipe oFF all the WTR
with a cloth. IF you don’t, the sand and WTR gunk up inside the chase bearing.
That’s like rubbing the cannon down with sandpaper every time the gun is fred—
not to mention the wear and tear on the seals.
When you’re fnished fring and the gun tube’s cooled down,
remember to put on more WTR.
Monthly!
Grie Cleaning
NEded
Monthly!
M777A2 Towed
Howitzer…
Go Smooth
on Tube Lube
Clean exposed areas with crocus cloth,
then add light coat of WTR
Remove ventilator cover monthly for cleaning
I’m gonna take
care of the
worn
spots
on your
gun tube!
Boy! I
can’t breathe
in there
with all those
fumes!
why isn’t
there any airflow!?
well, when
you
don’t
clean out my
personnel
ventilator
every month,
fumes
are
what you
get!
no!
not YOU!
yOu’ll
gunk up
my
chase bearing!
M992A2
Ammo
Carrier…
720 06-07.indd
1-2
9/24/12
3:48 PM
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