PS Magazine - TB 43-PS-745
PS, The Preventative Maintenance Monthly
ISSUE 745
DECEMBER 2014
PS 745
7
PS 745
DEC 14
PMCS
Make
sure
the
barrel
is
actually
locked
in.
Many
a
gunner has watched in dismay
as
their
M242’s
barrel
goes
fying oFF because they didn’t
lock it in. Check that LOCKED
is on top oF the barrel, then
move the barrel back and Forth
to make sure it’s locked in. IF it
turns, tell your repairman.
±eel the muzzle brake For
looseness,
too.
IF
it
turns
more than
1
/
4
inch, tell your
repairman. Vibration can cause
it to work loose and then it fies
oFF during ²ring.
Dear Editor,
Our brigade has found a lot of bolts, NSN 5305-01-336-8241, missing
from the breech crank assembly on M1-series tanks. Either the crews have
been removing the bolts, which they’re not supposed to do, or the bolts are
coming loose and falling out on their own.
Either way, the bolt; spring, NSN 5360-
12-189-0284; and nut, NSN 5310-01-
336-3521, on the breech crank assembly end
up missing. When that happens, the closing
piston comes apart and shoots across the
turret, especially during firing. That’s a good
way to hurt someone.
Crews should check the breech crank
assembly and report any bolts that are loose
or missing to their mechanic. He’ll apply sealing
compound, NSN 8030-01-025-1692, to
the bolt’s threads like it says in WP 0813 of
TM 9-2350-388-23-2-4 (Jan 09, w/Ch 1,
Oct 11) and WP 1359 of TM 9-2350-264-
23-2-6 (Jul 11, w/Ch 2, May 13). That’ll keep
those pins tight and our tank crews safe.
Dennis Dudley
TACOM LAR
Ft Hood, TX
Editor’s note:
That’s good info that all tank crews need to know, Dennis.
Mechanics, make sure you use the safety clip, NSN 5340-01-205-9963, to keep the
piston in place while adding sealing compound to the breech crank assembly bolt.
See WP 0774 in TM 9-2350-388-23-2-4 and WP 1342 in TM 9-2350-264-23-2-6
for more information.
Make sure LOCKED is
on top and then feel
barrel for looseness
Feel muzzle brake
for looseness, too
Override Safety
AP/HE Stops
Manual Safety
Remember, turn the manual saFety Forward to ²re and back For saFe. IF you Force the
saFety the wrong way, it can be damaged. That allows the gun to be ²red on SA±E.
M1-Series Tanks…
The
Shot
Heard
’Round
the
Turret
Apply sealing compound to threads
of breech crank assembly bolt
watch
Out!
Duck!
comin’
tHroUgh!
if you have to operate
the Bradley in override,
make very sure the driver’s
hatch is down
before
you
traverse the turret.
if you can’t get
the AP/HE stops
to move,
don’t
try forcing them
with something
like a hammer.
That just
breaks the stop
shafts. Let
your repairman
handle it.
if you forget, the M242
slams into the hatch, which
can
damage
the muzzle
brake and
throw off
the
M242’s zero.
And
don’t
forget
to
pay
attention
to the TM’s
warnings,
cautions
and notes.
745 06-07.indd
1-2
10/27/14
5:15 PM
Click here for a copy of this article to save or email.
Back to TopBack to Top
