PS Magazine - TB 43-PS-730

PS, The Preventative Maintenance Monthly

ISSUE 730

SEPTEMBER 2013
PS Magazine - TB 43-PS-730 - Page 4 of 33
5
PS 730
SEP 13
1.±
Pin, straight, headless; NSN 5315-01-342-0442
2.±
Hinge block, breechblock; NSN 1015-01-343-3354
3.±
Bushing, sleeve; NSN 3120-01-342-6676
4.±
Bushing, sleeve; NSN 3120-01-342-6677
5.±
Block, slide; NSN 1015-01-342-3754
6.±
Rod and follower assembly; NSN 1015-01-349-6264
7.±
Lever, breechblock, cocking; NSN 1015-01-340-7771
The following
breech assembly
components are
the prime suspects
for wear that can
cause firing pin
protrusion…
And remember: Dry fring causes just as much wear and tear as fring live ammo.
So whether live fring or dry fring, you have to clean and lube like it says in TMs
9-1015-252-10 and 9-1015-260-10.
Don’t Forget to do pre-fre checks, including the breech/fring pin operational
check, and
never
fre guns that Fail these checks.
IF you do have a Failure, contact TACOM’s light towed artillery team at:
usarmy.detroit.tacom.mbx.105mm-howitzer-team@mail.mil
± The± two± springs± (NSNs± 5360-99-
278-3735± and± 5360-99-507-2838)± that±
make±up±the±assembly±aren’t±covered±
in±the±TM±but±might±be±added±to±PMCS±
in± the± future.± But± not± cleaning± and±
greasing±the±springs±can±lead±to±rusty±
results.± The± springs± will± eventually±
break±and±have±to±be±replaced.±
± That’s± easy± to± prevent.± During±
routine±maintenance,±just±remove±the±
housing±and±give±both±springs±a±good±
cleaning±and±a±light±coat±of±WTR.
C
rewmen, not cleaning and lubing your M119A2 and M119A3 howitzers like you’re
supposed to can lead to an accidental discharge. And that’s defnitely not good!
Howitzer components wear out under
the best oF circumstances. Worn breech
assembly components can cause the fr-
ing pin to protrude past the Face oF the
breechblock. IF that happens, the gun
can fre when you close the breech, even
with the saFety levers on!
Br
i
iN
N
GG
G
G!
M119A2/A3±Towed±Howitzers…
Clean
and
Lube
to
Prevent
a
B
i
g B
o
o
m
!
M777A2±Towed±Howitzer…
Time For
Spring Spade
Assembly
Cleaning
Clean±springs±then±lube±with±WTR
Clean±
and±lube±
breechblock±
components±
to±prevent±
wear
Worn±components±
can±cause±firing±pin±
to±protrude±past±
breech-block±face
Crewmen, when
doing PM on
your M
777
A2
howitzer, take
a few minutes
to check the
spring spade
assembly.
tic
toc
tic
toc
tic
toc
AS You can
SEE, GeNERAL,
WE KeEP oUR
HOWiTZERS
PROPerLY…
…MAiNTaiNeD.
730 04-05.indd
1-2
7/22/13
3:36 PM
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