PS Magazine - TB 43-PS-678

PS, The Preventative Maintenance Monthly

ISSUE 678

MAY 2009
PS Magazine - TB 43-PS-678 - Page 10 of 33
16
PS 678
MAY 09
17
PS 678
MAY 09
Not locking the tow bar in place can lead to damage to the trailer and the back of
the truck when the trailer jackknifes. Your unit will end up replacing broken tow bar
lock pins more often than necessary, too.
So
before
backing the trailer, get out of your truck and lock the trailer’s towbar
in place. Straighten the tow bar to get rid of the tension. Then remove the hitch pin,
raise the lockpin handle, rotate it counterclockwise to the short slot, and replace the
hitch pin. After that, get a couple of ground guides to help you back up.
If the hitch pin and chain are missing, replace them with NSN 4010-01-353-9428.
You can also order the parts individually. The pin comes with NSN 5315-01-098-
6455 and the chain with NSN 4010-01-353-9368.
When you’re Fnished backing, unlock the towbar so you don’t forget when it’s
time to move out again.
Dear Half-Mast,
I found the article on M113A3 tow bar parts in PS 637 (Dec 05) to be a
lot of help. Do you have any similar info on the wheeled vehicle tow bar, NSN
We have a big problem with missing pins and haven’t been able to
locate the parts or numbers. Anything you can provide would be greatly
appreciated!
CW2 A.H.E.
Dear Mr. A.H.E.,
This one’s a little complicated, but I think we can help you out, Sir.
First, if you’re still using tow bar, NSN 4910-00-433-7094, stop! TACOM Safety-
of-Use Message 05-001 deadlined these tow bars because of a potentially dangerous
design de±ciency.
The SOUM tells you to inspect the tow bar to see if it has been modi±ed. Modi±ed tow
bars will have a sleeve welded to the ±xed leg, the moveable leg, and to each of the two
male insert legs. Once modi±ed, the tow bar’s NSN changes to 4910-01-365-9304.
You’ll ±nd SOUM 05-001 at the AEPS website:
If your tow bar doesn’t have the sleeves, it’ll need to be modi±ed following the
instructions in MWO 9-4910-593-20-1. Use your AKO login and password to access it
at the LOGSA ETM website:
The modi±ed tow bar, NSN 4910-01-365-9304, is covered by TM 9-4910-593-12&P:
You’ll need your AKO login and password to access the TM. The repair parts for the
tow bar are in Appendix C of the TM.
M989A1 HEMAT Trailer…
Lock Up
Before
You Back Up
Tactical Vehicles…
Tow Bar Help Needed
Move lockpin handle from open…
…to locked position before backing
drivers, do you
remember to
lock your hemat
trailer’s towbar
in place before
you back up?
if not, you
could create
a problem for
your unit that
can easily be
avoided.
I learned my
lesson the
last time!
I’m locking
the trailer’s
towbar
before
backing up!
Tow bar, NSN
ModiFed tow bar with sleeves,
678.16-17.indd
1-2
4/2/09
1:46:20 PM
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