PS Magazine - TB 43-PS-710

PS, The Preventative Maintenance Monthly

ISSUE 710

JANUARY 2012
PS Magazine - TB 43-PS-710 - Page 8 of 33
12
PS 710
JAN 12
13
PS 710
JAN 12
C
ontrol
B
ox
B
uzz
H
ey, have you heard about the S3? No, we don’t mean your unit’s operations ofFcer!
We’re talking about your HMMWV’s smart start system (S3) control box.
Some people didn’t get the word that the S3 control box, NSN 6110-01-542-7901,
is replacing the engine electrical start system (EESS) control box, NSN 6110-01-
491-2158. The S3 was put into HMMWV production starting with serial number
255269.
When you order the S3, you’ll
get the S3 box and the temperature
sensor.
The
biggest
difference
between the EESS and the S3 is
that the S3 control box has three
connector receptacles, while the
EESS control box has only two. The
plan is to use the third connector
receptacle on the S3 control box in
the future for troubleshooting and
data logging.
Right now, the HMMWV parts manuals, TM 9-2320-280-24P and TM 9-2320-
387-24P, don’t reference the S3 control box. But you should see it listed once the
TMs are updated.
±or answers to your questions about your HMMWV’s S3, contact TACOM’s
Gaines Stevens. He’s at DSN 786-2371, 586-282-2371 and
gaines.e.stevens.civ@mail.mil
Judy Iglesias at TACOM can also help you. She’s at DSN 786-4758, 586-282-
4758 and
judy.l.iglesias.civ@mail.mil
I
f you have vehicles just sitting in
your motor pool, especially in cold or
humid places, operate them at least
every two weeks. This applies to tanks,
wreckers, and cranes, as well as trucks
and trailers.
Operating vehicles at least every
two weeks helps keep hydraulics
working and fluids flowing to lube
what they need to. If your vehicles
sit idle for too long, hoses can dry-rot
and crack. Valves, valve bodies, belts,
brakes, and transmission shafts might
also break or have trouble moving.
Operators, remember to drain the air tanks on your
±MTV after the day’s run. If you forget, moisture builds
up and freezes. It creates corrosion that plugs up the
entire air system, including brake valves and cylinders,
CTIS Flters and gladhands. It can also lead to vehicle
brake failure.
Open each air tank’s petcock just long enough to drain
the water, then close it. Don’t leave the tanks open. That
won’t get rid of water, it just creates more.
How come?
Condensation forms during the night and builds up in
the tank. When you close the tank in the morning just
before you’re ready to drive, water is trapped inside the
tank. More water means more corrosion.
Motion
Means Maintenance!
S
HMMWV.…
FMTV…
Tactical Vehicles…
D
rain
the
A
ir
T
anks!
Motion
Means Maintenance!
What do you think
they’re talking about?
I dunno,
but I got
a bad
feeling
about it!
I feEl
sluggish.
I
wish THey’d operate
me instead of just
letting me sit.
S3 control box, NSN 6110-01-542-7901,
replaces EESS control box
Drain moisture from all air tanks after operation
if brevity is the
soul of wit, then
PM is the soul of
vehicle survival—
—
especially in
cold weather.
S
mart
tart
ystem
710 12-13.indd
1-2
12/5/11
5:55 PM
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