PS Magazine - TB 43-PS-577

PS, The Preventative Maintenance Monthly

ISSUE 577

DECEMBER 2000

PS Magazine - TB 43-PS-577 - Page 10 of 35
PS 577
17
DEC 00
PS 577
16
DEC 00
rivers, the personnel ventilator on your M992A2 ammo carrier has an impor-
tant job. 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 cleaned out of
the ventilator exhaust. If the exhaust is clogged, there’s no airflow and your
vehicle is NMC.
At least monthly, remove the grille covering the exhaust and clean out any
debris that has collected. You may have some problems with the grille’s rear
socket head screws, though. Because
the screw sits just under the tow
cable, you’ll have a hard time get-
ting your socket wrench in place to
remove them.
Once the grille is finally off, save
yourself aggravation next time by
replacing the socket head screws
with regular hex head screws, NSN
5305-00-719-5219. You can remove
them without having to move the tow
cable.
Dear Sergeant J.W.C.,
The fan cover is not stocked because
impeller fans are high-speed balanced at
the factory with the covers in place.
Exchanging a damaged cover for another
one will result in an unbalanced fan that
will vibrate enough to eventually fail.
Always replace the entire fan, NSN
4140-01-284-5722, whenever the cover is
damaged enough to cause noise or
excessive vibration.
Dear Half-Mast,
The cover on my Paladin’s engine impeller fan is dinged and banged up to
the point that the fan vibrates too much. I’ve looked in the parts TM, but
can’t find a replacement cover.
It seems a shame to order a new fan just because of a bad cover. Should
I try to find one through my cannibalization point?
SGT J.W.C.
M109-Series SP Howitzers, M992A2 Ammo Carrier . . .
Cover damaged? Replace
engine impeller fan
M992A2 Ammo Carrier . . .
Replace socket head
screws with hex head screws
darn
these
screws! how am
i supposed to get
this grille off,
anyway?
try
switchin' to
hex heads
!
w-what's
g-going
on?
i don't
know
! all i did
was
replace
your
damaged impeller
fan cover with
a
different
one
.
PS 577
17
DEC 00
PS 577
16
DEC 00


Back to Top
Back to Top