PS Magazine - TB 43-PS-693

PS, The Preventative Maintenance Monthly

ISSUE 693

AUGUST 2010
PS Magazine - TB 43-PS-693 - Page 6 of 33
8
PS 693
AUG 10
9
PS 693
AUG 10
N
obody
likes to see an FRH spill.
Cleanup’s a hassle and your environmental folks will be breathing down your neck
all day.
That’s why it’s important to keep the hydraulic line quick-disconnect couplings on
your AVLB’s bridge in good shape. Pay particular attention to the coupling plug used
to mate the bridge and launcher.
On the mating end of the bridge, the male coupling, NSN 4730-00-182-9086, has
a bearing at the end that retracts to let FRH flow once the bridge is mated.
The rest of the time, the bearing is kept
±rmly extended by an internal spring.
Over time, that spring can weaken.
When that happens, FRH oozes out past
the bearing and ends up in a puddle on
the ground.
The best way to prevent that mess is
with a quick inspection of the coupling.
If you can push the bearing in with
your ±nger, the spring is too weak and
the coupling should be replaced. If the
bearing won’t move, the coupling’s
good to go.
A
slippery jack strut assembly can be a real danger to you and your M119A2
howitzer.
The jack strut is designed to hold the howitzer up so you can remove the tire and
swing the gun tube around to the towing or ±ring positions. If it slips, the howitzer
can fall on you or someone else.
That’s why it’s so important to
keep an eye on the jack strut’s rubber
cushioning pad. The strut can slip
if the pad is damaged or missing,
especially if it’s used on wet concrete
or muddy ground.
So, during PMCS, take a look at the
bottom of the jack strut. If the pad is
damaged or missing entirely, replace
it with NSN 2590-01-462-0746. It’s
held in place with four blind rivets,
AVLB…
Weak
Spring
Can
Cause
l
e
a
k
!
M119A2 Towed
Howitzer…
Put A
Stop
to
Sli
ery Struts
oh,
great!
an frh
spill!!
we’d better notify
the environmental
folks. there goes
our day!
Bearing should not retract
when pressed by hand
Pad missing?
Replace it!
the battlefield is a
rough
place. don’t
make it
worse
with
a slippery jack
strut assembly!
693.08-09.indd
1-2
6/25/10
1:10:20 PM
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