PS Magazine - TB 43-PS-675

PS, The Preventative Maintenance Monthly

ISSUE 675

FEBRUARY 2009
PS Magazine - TB 43-PS-675 - Page 6 of 33
8
PS 675
FEB 09
9
PS 675
FEB 09
The ram is held in place with two screws. The constant stress of closing the breech,
especially during live Fre, can loosen the screws and allow the ram to break or fall
off. That’s why it’s important to make sure the screws are installed properly.
Take a quick look at the screw heads. There should be two stake marks on each
screw head.
If you don’t see the stake marks, the screws
will
come loose. Ask your mechanic
to stake them properly. He’ll follow the procedures on Page 4-108 of TM 9-2350-
314-34-2.
T
he M777 howitzer operates on a 24-volt system with two 12-volt batteries. Those
batteries are crucial to the operation of the howitzer.
Unfortunately, howitzers can spend many days sitting in the motorpool between
uses. The batteries slowly drain until they’re useless when it’s time for the next
mission.
Of course you could drive the prime mover to each of the guns, hook it up and run
the vehicle (700 rpm for the ±MTV and approximately 850 rpm for the M939-series
5-ton) until the batteries are charged. But that can take a lot of time, especially if you
have a whole battalion of howitzers. And with the cost of fuel nowadays, keeping the
batteries charged that way is almost more expensive than buying new batteries.
That’s why a solar battery charger
is available in the howitzer’s BII.
You’ll Fnd the charger listed as Item
76 on Page B-16 of TM 9-1025-215-
10 (Jun 06 w/Ch 2, Oct 07).
There are three NSNs available.
NSN
gets
the
charger, case and solar panel. NSN
6130-01-521-1387 gets the charger
and solar panel, but no case. Get just
the charger with no case or solar panel
M109A6 Paladin…
M777A1/A2 Towed Howitzer…
Charge ahead on Batteries
Use solar charger
to keep batteries
charged
what’s
wrong
with
you?!
my batteries are
so…drained I
think… I’m gonna…
keel over…
if that’s a
sound you hear
when closing
the breech on
your m109a6
paladin,
chances are
the breech
roller ram has
fallen off.
yep! there
goes my breech
roller ram!
ouch!
what was
that!?
No stake marks on screws? Call your mechanic
675.08-09.indd
1-2
12/18/08
1:22:06 PM
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