PS Magazine - TB 43-PS-637
PS, The Preventative Maintenance Monthly
ISSUE 637
DECEMBER 2005
PS 637
DEC 05
20
Machine Gun Mounts…
Dear Half-Mast,
Thanks for the article in PS
621 (Aug 04) on all the mount-
ing options for machine guns. It
answered a lot of our questions
on what was needed for different
vehicles and the NSNs for
ordering mounts and supporting
hardware. We heard there is now
a poster showing that informa-
tion. How can we get it?
SGT B.R.
S
ome M249 machine gunners are removing the short pin that holds the gas regulator collar on
some short barrels and replacing it with a longer pin from the standard M249 barrel or the newer
short barrel. They figure a longer pin will keep the heatshield from rotating on the barrel.
Bad move!
The pin is supposed to be permanently installed and is considered a non-repairable item.
Once the pin has been removed, the holes for the gas system in the collar and barrel won’t line
up properly. Then the gas system doesn’t have enough gas to force the bolt back and the M249
stops firing. And there’s nothing you can do to fix it other than replacing the
$
814 barrel.
Hands off that pin!
Dear Sergeant B.R.,
Your pubs clerk can order
DA Poster 750-97 through
your pubs account.
Leave That Pin Alone!
M249
Machine
Gun…
Removing pin stops firing
this poster
has what we
need to work
together!
all the
parts and
nsns are
here!
How Do I Get A Mount Poster?
PS 637
DEC 05
M224 Mortar…
G
ood news, mortar units! The Army has changed the condemnation limit on M224
mortar cannon tubes from 2.411 inches to 2.421. That means you will be able to use
the tubes longer. But the change means you will need to update parts of TM 9-1000-
202-14,
Evaluation of Cannon Tubes.
Here’s what changes:
There are several other changes to TM 9-1000-202-14 that have to do with
Direct Support’s borescoping and pullover procedures.
Your support can get a
copy of them by contacting their local TACOM logistics assistance representative or
TACOM
at
DSN 793-6357/(309) 782-6357 or email:
ploenh@ria.army.mil
Item 1, Para M-3.b, Page M-2
becomes:
b. Frequency of Inspection
1) M225 cannon. In addition to Frequency of Inspection criteria found in Para 2-
3b, arrange for Direct Support to borescope and pullover gage the cannon tube
after every additional 1,000 rounds once 10,000 rounds have been fired or when the
bore diameter equals or exceeds 2.402 inches. Have DS borescope and pullover
gage the tube after every additional 500 rounds once the bore diameter equals or
exceeds 2.411 inches.
Borescope the M225 cannon tube every 100 rounds when firing subcaliber train-
ing rounds. The cannon tube should be inspected following three successive short
rounds. Ensure that the correct number of charges and correct firing tables were
used.
Item 2, Para M-6.c, Page M-3
changes to the same as M-3.b(1) and (2). Pullover
readings are to be taken in accordance with Para M-6.e.
21
hey,
good news!
they’ve changed
the standards on
your barrel!
hooray!
you
won’t
need to
replace me
after all!
637.20-21(C!).qxd
11/1/05
11:39 AM
Page 1
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