PS Magazine - TB 43-PS-565
PS, The Preventative Maintenance Monthly
ISSUE 565
DECEMBER 1999
PS 565
9
DEC 99
PS 565
8
DEC 99
No start? Push
in EMERGENCY
STOP button
f you can’t keep air in
a CTIS-equipped wheel
after you’ve done hub re-
pair or maintenance on your
M939A2-series truck, you
probably installed one or both
air seals backward.
Putting either of the two
seals in backward lets air
escape through the wheel.
The trouble is that the seals
don’t look much different
from side to side, making
it easy to install them back-
ward—
if you don’t know
what to look for
.
One side of the seal has
NON-PRESSURE SIDE im-
printed in the rubber. That’s
the key to correct installation.
Eyeball Para 3-460 and
Para 3-461 of TM 9-2320-272-
24-2. These installation instruc-
tions tell you to use the long end of the
air seal installer to install an air seal
with the spring facing out.
This spring, which gives the seal its
shape, is often
hard to see. Just re-
member that the spring side is oppo-
site from the imprint non-pressure side.
For this first seal, the imprinted side
should face away from you when it’s
seated.
The second air seal is installed with
the short end of the installer. For this
seal, the imprinted side must face to-
ward you when it’s seated.
350-GPM Fuel Pumps . . .
M939A2-Series Trucks . . .
As long as the button is out, the bat-
tery is supplying power. If the button’s
out overnight, for example, bye-bye
power.
Starting procedures require that you
pull out the EMERGENCY STOP
button, push in the PUSH FOR OIL
PRESSURE BYPASS button and push
in the PUSH TO START button.
If you don’t get a start, and have to
call in a mechanic, remember to push
in the EMERGENCY STOP button.
Additionally, operators need to check
the O-ring in the top of the separator
Drain
fuel/water
separator
weekly
Check O-ring
for breaks
hether your 350-gpm fuel pump
is pumping or parked, use these tips to
keep it ready:
The TM’s PMCS calls for draining
the fuel/water separator weekly. If
you don’t, corrosion quickly creates
crud in the filter. Most of the crud is
caught by the filter, but some gets to
the fuel
pump,
causing
a pump
failure.
➤
➤
i need
pm,
too
!
i'm
feelin'
mighty
lo
o
o
o
o
w
!
when they do the draining. A broken
O-ring lets air into the fuel system,
preventing starts.
Install seal correct side up
PS 565
9
DEC 99
PS 565
8
DEC 99
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