PS Magazine - TB 43-PS-726

PS, The Preventative Maintenance Monthly

ISSUE 726

MAY 2013
PS Magazine - TB 43-PS-726 - Page 6 of 33
9
PS 726
MAY 13
Wrecker
Other M939A2 Trucks
If your vehicle had its CTIS’ electronic control unit
(ECU) replaced within the last four years, the CTIS
may already be capable of the new 70 psi highway
requirement. There are two ways of Fnding out:
1.±
Check the vehicle’s tire pressure after the CTIS has
operated in highway mode and reached its highway
requirement of 70 psi. If the pressure stays at 70 psi, the
CTIS is updated and you’re good to go.
2.±
Look on the back of the ECU after it’s been removed
from the vehicle’s shift tower. An updated ECU has a
label marked 70 psi for highway mode.
M1152 HMMWV Fire Extinguisher NSN
If you need the short Fre extinguisher bottle used in M1152 HMMWVs, order NSN
4210-01-562-0852. It’s not listed in TM 9-2320-387-24P yet. The regular Fre extinguisher,
NSN 4210-01-525-6692, used in all other up-armored HMMWVs, is in the parts manual.
MRAP M-ATV Service Kits
Get the annual service kit for the M1240 M-ATV with NSN 2530-01-591-1753. NSN 2530-
01-591-1751 gets the annual service kit for the M1245 SOCOM M-ATV.
CAT Engine Valve Push Rod NSN
Tell your buddy in sustainment maintenance to get the valve push rod for the Caterpillar
3126 and C7 engines with NSN 2815-01-570-5374. Then make a note until this NSN
replaces the parts info shown in all the ±MTV and MRAP TMs with CAT engines.
M939A2-Series 5-Ton Trucks…
if your vehicle has an original
or non-functioning ECU, order a
new
one with NSN 6110-01-268-8
7
39
You’ll need
these items
for the
wrecker to
achieve its new
90 psi highway
mode…
You’ll find the removal
and replacement procedures
starting in WP 0810 Of
TM 9-2320-2
7
2-23-5 (sep 12).
Updated ECU
has 70 psi label
on back
Item
NSN
Valve kit, front wheel
Valve kit, rear wheel
Electronic control unit
(ECU)
Pressure transducer kit
Operators! keep these tire
pressures in mind when you
take me on a long-distance
Highway MisSion!
make sure the tires on
your M939A2 wrecker
are inflated to 90
psi while performing
long-distance highway
missions.
Tires on all other
M939A2 models need to
be inflated to
7
0 psi.
There’s a
problem—
the vehicle’s original
central tire inflation
system (CTIS) only
provides 80 psi for
the wrecker and 60 psi
for all other M939A2
5-ton models!
Good news!
New hardware
that
increases
your vehicle’s
CTIS air
pressure is
available.
726 08-09.indd
1-2
3/25/13
1:33 PM
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