PS Magazine - TB 43-PS-577
PS, The Preventative Maintenance Monthly
ISSUE 577
DECEMBER 2000
eaving water in the air tanks of any truck is bad news in freezing weather, but
it’s really bad news for M915-series trucks.
Not only do you get the usual braking problems, but the water gets into the air
lines and ends up in the transmission control group. That causes the transmission
to grind and miss gears.
Draining the air tanks just once may
not get all the moisture out. To make
sure, let the air pressure build up again
after you’ve drained the water out once.
Then drain the air tanks again. Keep
doing this until no more water comes
out of the tanks.
Drain the air tanks every day the tem-
perature is below freezing, whether you
drive the truck or not. Be sure to ser-
vice the air dryer desiccant filter, too, when scheduled.
unning vehicles indoors without
ventilation is asking for trouble and
courting death. But that’s what hap-
pens in many motor pools during cold
weather.
You can fix the problem by running
exhaust fumes safely outside with flex-
ible exhaust extensions.
The unit of issue is feet, so order the
length you need.
NSN 4720-00-
Inside diameter
174-4668
1 inch
278-8030
1
1
/
2
inches
278-8027
1
3
/
4
inches
278-8031
2 inches
174-6818
2
1
/
2
inches
174-4664
3 inches
174-4671
4 inches
M915-Series Trucks . . .
You need a snug fit of extension-to-
exhaust pipe to prevent leaks, so eye-
ball this list of extensions that fit
common tailpipe sizes:
Run exhaust outside
Drain
all
water
from
air
tanks
PS 577
11
DEC 00
PS 577
10
DEC 00
there!
now your air
tanks are
all
drained
.
ahhh!
what a
relief
!
All Vehicles . . .
drat!
that exhaust
extension has
left me
out
in
the
cold
!
...and
stay
out
!
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