PS Magazine - TB 43-PS-555
PS, The Preventative Maintenance Monthly
ISSUE 555
FEBRUARY 1999
PS 555
5
FEB 99
PS 555
4
FEB 99
M931/A1/A2-Series Trucks . . .
Door Handle Scandal
M
echanics, always make sure an
M939/A1/A2-series truck’s inside
door handles point forward.
A door handle installed backwards
will make a convenient armrest—
until the door opens.
Play it safe. Install the door
handles with the open end forward.
echanics, when a HMMWV’s
brake warning light stays on after you
release the parking brake, something’s
wrong. But, before you replace any
parts, try bleeding the brake lines.
Look for this vent line
HMMWV . . .
better get
one added
before
the brakes
fail
!
this deuce
doesn't have
a
brake
line vent
on the
firewall
.
2
1
/
2
-Ton Trucks . . .
Since air in the brake lines will keep
the light on, good parts and your valu-
able time can be wasted trying to turn
out that light.
If the light stays on after bleeding,
use the troubleshooting info starting on
Page 2-319 of TM 9-2320-280-20-1.
If the proportioning valve is the cul-
prit, replace it.
When you replace the proportioning
valve, follow the word in Para 7-18 of
TM 9-2320-280-20-2,
and add a light coat
of lube, NSN
9150-00-273-
2389, to the
connector pins.
That heads off
corrosion.
Never try to save a
bad valve by taking it apart and adjust-
ing it. Any tampering ruins the calibra-
tion set at the factory.
If light stays on, air may be in brake system
ive your M44A2-series 2
1
/
2
-ton truck a quick check for a separate brake
hydraulic vent line in the engine compartment.
The line is attached to the firewall about four inches
from the top edge. The line loops over another hose and
ends with a bushing. If you must deep water ford, add
breather, NSN 4820-00-726-4719, to the bushing.
Without this separate vent line, fuel vapors can con-
taminate brake fluid, leading to swelling of seals in the
brake/air hydraulic cylinder, and brake failure.
Most 2
1
/
2
-ton trucks have this modification, but there
have been reports that some still don’t. Get this infor-
mation on how to add the vent line from Half-Mast.
He’ll send you copies of Pages 18-20, PS 364 (Mar 83).
Add lube to
protect pins
All Vehicles . . .
Keep
Y
o
u
r Rear End Covered
Too often that’s the response when an Army vehicle
is rear-ended.
If your commander gives the nod, you can add reflective decals to your
vehicles, and help cut down rear-end collisions.
The decals come in two sizes, 7
7
/
8
inches
square and 15
3
/
4
inches square. They are peel-
and-mount decals, so surfaces must be clean
before the decals are applied. Make sure the
yellow portion of the decal always points
down and to the outside of the vehicle.
Order the smaller decal with NSN 9390-
01-382-8308 and the bigger one with NSN
I didn’t
see him
until
it was
too late
.
Reflective decals
Handles
should
point
forward
PS 555
5
FEB 99
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