PS Magazine - TB 43-PS-688
PS, The Preventative Maintenance Monthly
ISSUE 688
MARCH 2010
14
PS 688
MAR 10
15
PS 688
MAR 10
The problem
occurs while using
the 5
1
/
4
-in caging
bolts, NSN 5306-
01-500-8736,
PN A-4X-1883,
on the rear brake
chambers. The rear
shock absorbers are
in the way of putting
the bolts in the end
of the chambers.
W
hen was the last time you took a really good look at your FMTV’s air tanks? If
you’ve got any -A1 model FMTV trucks with serial numbers 104,314 through 117,858
or M1082 and M1095 FMTV trailers with serial numbers 202,197 through 206,367,
eyeball those air tanks right away! The air tanks made by RDS Manufacturing could
be bad.
TACOM SOUM 09-032 tells you all about the trouble with your FMTV’s
RDS air tanks. That safety message was released in September 09, but there
are still FMTVs with bad air tanks out there. All units that have FMTVs with the
serial numbers above must report to TACOM’s John Clary, DSN 786-6965, (586)
282-6965 or email:
john.d.clary@conus.army.mil
Your FMTV truck or trailer is NMC until a mechanic replaces the bad tank.
Bad air tanks can rupture, causing the air brake system to fail.
By the way, there was a similar issue with the Caiman MRAPs. We told you about
that on page 47 of PS 679 (Jun 09). Or you might have learned about it from TACOM
SOUM 09-003.
Check
to
see
if your
FMTV’s
primary, secondary, wet, and trailer air
tanks have “RDS MFG” on them. You
may need to remove the paint with a
wire brush to get to it. If you see “RDS
MFG”, get the needed replacement
parts at no cost to your unit. Contact
John Clary to order those parts.
Make sure you follow the instructions
in TACOM SOUM 09-032. You can
view it online:
For more info, contact John Clary.
When you encounter this problem, just use the four shorter (3-in) caging bolts,
NSN 5306-01-479-1492, PN 12422439. They are stored on the rear axle castings.
These bolts were designed to ±x this problem, so use them only for caging
the rear brake chambers if the longer bolts don’t ±t. And store the longer caging
bolts you won’t be using on the holding ±xture found on the side of the brake
chamber housings.
Air
Tank
Trouble
Rear Brake Chamber
Bolt Clearance Cut
FMTV…
Rear Brake Chamber
Bolt Clearance Cut
FMTV…
Air
Tank
Trouble
Normal 5
1
/
4
-in
caging bolt storage
Special 3-in caging bolt storage
area for brake chambers with
shock absorber interference
Rear brake
chamber
Caging bolt installed here
after removing plug
5
1
/
4
-in
caging bolt
Rub off
paint on air
tanks and
look for
“RDS MFG”
whatcha
doing?
inspecting the air
tanks to comply with
tacom soum 09-032!
Shock
absorber
interferes
with 5
1
/
4-in
caging bolt
Brake chamber
Word from the
field is that 5-ton
FMTVs have a
bolt
interference
problem.
tell ‘em
about my
rear brake
chambers!
688.14-15.indd
1-2
2/5/10
10:12:09 AM
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