PS Magazine - TB 43-PS-631
PS, The Preventative Maintenance Monthly
ISSUE 631
JUNE 2005
M
echanics, if you’ve been getting complaints of a hot-running engine in an M109-
series howitzer or M992-series ammo carrier, make the radiator shroud seals one of
your first checks.
Those seals form an air barrier between the radiator and fan tower. That barrier
increases air flow across the radiator to keep the engine cool. If seals are missing,
torn, squashed or mangled, air escapes around the sides of the radiator. Engine tem-
perature goes up.
Have your mechanic check out the
shroud seals next time the pack’s out.
If the seals are missing or damaged,
he’ll order new ones.
NSN 5330-00-102-9927 gets a seal
for the right or left side. NSN 5330-01-
314-1439 gets a top or bottom seal for
the M109A6 and the M992A2. A top
or bottom seal for the M109A2-A5
comes with NSN 5330-00-899-5220.
M109-Series SP Howitzers, M992-Series Ammo Carriers…
PS 631
JUN 05
7
M2/M3-Series Bradley, MLRS Carrier…
A new section entitled “Operating Vehicle in Extreme Heat” will soon be added
to the operator’s TMs. Until the TMs are updated, Maintenance Advisory Message
05-003 provides the following guidance when operating on paved roads at convoy
speeds faster than 25 mph or when temperatures have reached or exceeded 100°F:
Crewmen should check for track pin movement and inspect track tension hourly,
or as soon as the tactical situation permits.
If you find protruding pins, you can—as a BDAR fix only—hammer the pins back
into place and continue operating until the vehicle reaches a safe location for
repair. However, you must mark the bad bushing so that it is easily identified when
repairs are possible. The best way to do this is by scribing a mark on the metal sur-
face of the affected shoe with a screwdriver.
I
t’s a fact of life: The hotter it gets, the harder it is on your Bradley and MLRS
T157I track.
When operating on improved
road surfaces at increased convoy
speeds (faster than 25 mph) and
when temperatures are at or above
100°F, track bushings tend to soften.
That allows the bushing pin to move
around and extend out of the bush-
ing bore. Protruding pins make your
vehicle NMC.
Replace worn or missing shroud seal
Pin nut protruding past bushing bore?
so was mine…
until
I got new radiator
shroud seals!
man, my
engine’s really
running
hot!
driving
at this
speed…
…on a
paved
road…
…in
these
tempera-
tures…
…is
killing
our track!
631.06-07(C)
4/25/05
4:37 PM
Page 1
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