PS Magazine - TB 43-PS-680

PS, The Preventative Maintenance Monthly

ISSUE 680

JULY 2009
PS Magazine - TB 43-PS-680 - Page 10 of 33
16
PS 680
JUL 09
17
PS 680
Y
ou HMMWV drivers are well acquainted with vibration, especially when you go
through the shake, rattle and roll of cross-country driving.
What you may not know is that vibration is just the Frst step of a domino effect
that can cause real damage to your truck.
As you rock and roll over hill and dale, vibration can loosen the halfshaft bolts. As
they back out, the bolts catch on the brake caliper adapter and eventually break off.
Then the brake rotor wobbles and wears out the brake pads. Being brakeless in a
moving vehicle is bad news!
You can’t do anything about the vibration, but you can keep a close eye on the
halfshaft bolts. The time to look is during PMCS and whenever you stop for a few
minutes while in the Feld.
Look for shiny areas under and
around the bolt heads. If you see a
loose bolt, report it. Your mechanic
will replace the bolt, NSN 5306-01-
185-7048, and install a new two-piece
lock washer, NSN 5310-01-457-3292.
Never reuse the lock washer. It
won’t hold the second time around.
It’s a one-time use item. Also, make
sure all bolts and washers are replaced
any time the disc rotor or halfshaft
assembly is replaced.
Dear Editor,
While servicing our FMTV, I noticed
that the front CTIS air brake lines
had been damaged
-even punctured!
This happened because the brake
lines rubbed against each other when-
ever the steering knuckle assembly
turned.
Unnecessary breakdowns or early
replacement of these lines can be
easily avoided using my solution that
was approved by the Army’s SMART
program.
This fix is cheap, works on all
FMTVs, extends the life of the hoses
and cuts down on maintenance costs.
Plus, the materials needed to do the
work can be found in any motor pool.
First, cut the zip ties that hold the ABS cable. Then install two
5
/
8-in
wide nylon-coated loop clamps, NSN 5340-00-725-5280. Interconnect
these clamps with each other at the top of the CTIS main lines using bolt,
NSN 5306-01-330-8490; washer, NSN 5310-01-359-8806; and
HMMWV…
W
h
o
l
e
L
o
t
t
a
S
h
a
k
i
n
’ G
o
i
n
’ O
n
!
FMTV…
Preserve CTIS Air
Brake Lines
Check halfshaft bolts for looseness
I h-hope they ch-
check my halfshuh-
shaft bOlts at the
nUh-next stop!
they’re
fuh-feelin’
lOose as a
guh-goose!
Damaged CTIS air brake lines
Give it to
me straight,
doc. why
did I break
down?
Your CTIS air brake lines
are damaged. I’m not sure
how to prevent that…
waitaminit.
I
can fix
this with
stuff from
my motor
pool!
680.16-17.indd
1-2
6/9/09
4:44:47 PM
Click here for a copy of this article to save or email.
Click here for a copy of this article to save or email.
Back to Top
Back to Top