PS Magazine - TB 43-PS-667
PS, The Preventative Maintenance Monthly
ISSUE 667
JUNE 2008
19
PS 667
JUNE 08
If after several minutes you notice under-inflated tires and you’ve done the checks
in the -10 TM,
stop
. That’s all you should do. Call in your mechanic for some help.
Air Filter Screen
Something
your
mechanic
can
check out is the little air Flter (screen)
that Flters out dust, sand and dirt
in the trucks’ CTIS. The little Flter,
shown as Item 21 in ±ig 153 of TM
9-2320-391-24P, clogs up, causing
restricted air flow in the CTIS.
Suspect a clogged Flter? Your best
bet is to have your mechanic clean
the Flter or replace it with NSN
4460-01-284-2344. The Flter should
be replaced at least once a year.
Don’t be tempted to manually add air to any
tire on the vehicle while operating the central tire
inflation system (CTIS). You can mess up the CTIS’
electronic control unit (ECU). Then your mechanic
will have to disconnect the CTIS system to manually
add air.
The CTIS regulates the air pressure, adding or
removing air as necessary. Once you crank up your
truck, the ECU automatically checks and regulates
the air pressure in each tire.
If you suspect the tire pressure is still not right,
check to see that you have selected the proper
ECU mode.
±or example, if you select “sand,” the CTIS
lowers the tire’s air pressure for driving in the sand.
H
aving trouble with the underbody attachments failing on your M1114, M1116
or M1145 up-armored HMMWV? You’re not alone.
This growing problem has led TACOM LCMC to buy improved, extreme duty
underbody retainer plates for up-armored HMMWVs. But they’re not available in the
supply system yet. Until that happens, NMC standards will temporarily be relaxed IF
the HMMWV has the Frag Kit 2—the front wheel well fragmentation kit—installed.
With the Frag Kit 2,
your HMMWV is considered fully mission capable (FMC):
•
even if it has missing plates at position 1
•
if it has at least 3 bolts present between positions 2, 3, and 4 per side
Without the Frag Kit 2,
your HMMWV is considered not fully mission capable
(NMC) if it:
•
has missing plate or hardware from stations 1 and 5, per side
•
has more than 3 bolts missing, from stations 2, 3, and 4, per side
Make sure the underbody bolts and plates are not loose as you perform these
BEFORE
and
AFTER
PMCS inspections! If they are loose, tighten ‘em.
Up-Armored HMMWVs…
FMTV…
CTIS
Wheel
Info
you’re ready
to head out,
but after
starting your
fmtv, a tire
still looks a
bit low.
what do
you do?
Check to see if you
have proper ECU mode
This little
±lter screen
is part of
the truck’s
CTIS system
Clean or
replace
clogged
±lter
NMC Standards Temporarily
Change for Underbody
FRAG KIT #2
667.18-19.indd
1-2
5/5/08
6:14:48 PM
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