PS Magazine - TB 43-PS-683
PS, The Preventative Maintenance Monthly
ISSUE 683
OCTOBER 2009
2
PS 683
OCT 09
3
PS 683
OCT 09
M
echanics, the semiannual gun mount assembly GO/NO GO check is crucial. If
you don’t do it, or do it wrong, main gun accuracy can degrade until it becomes
difFcult to hit a target.
It seems to be a pretty simple check. All you have to do is use the fabricated piston
seating gage and follow the directions on the breech decal.
But wait! Turns out there’s a problem with those directions.
Step 3 on the decal says to read the top of the coax ammo feed chute against the
scale on the gage. But the gage was redesigned some time back, so you should now
be reading the
top of the breech block
against the gage.
The correct instructions are on Page 2-32 of TM 9-2350-264-20-2-1 (Apr 03) and
WP 0258-22 of TM 9-2350-388-23-2-2 (Jan 09). But most mechanics just follow the
decal and get a wrong reading.
A new decal, PN 9376991-1,
has been designed and will soon
start appearing on tanks coming
out of RESET. Unfortunately,
the decal isn’t available in the
supply system yet.
Until it is, use a permanent
marker to cross out
COAX
AMMO FEED CHUTE
on
the current decal’s step 3. Then
write in
BREECH BLOCK
in
its place. That’ll help prevent
using the wrong measurement
for the semiannual check.
#1:
Both the M2 and MK 19 are very heavy. That’s why moving them is a
two-man
lift.
Trying to do it all by yourself is a good way to get hurt. And dropping the machine
gun doesn’t do it much good either.
#2:
Don’t lower the machine gun through the gunner’s hatch. If it slips, the barrel
may hit the Fre control unit (±CU) screen. A damaged screen means the entire ±CU, NSN
1220-01-543-4270, has to be replaced. And with a replacement cost of nearly $40,000, a
new ±CU is not something most units want on their shopping lists.
Instead, lower the machine gun through the commander’s hatch. That keeps the
barrel away from the screen and prevents accidental damage to the ±CU.
Stryker…
Doing the Machine Gun Two-Step
M1-Series Tanks…
however, there are two
very
important things to remember
when moving the machine gun
inside your stryker.
remember them and you’ll save
yourself an injury and your
unit a whole lot of money.
crewmen, the
procedures for
removing the m2 or
mk 19 machine guns from
your stryker’s remote
weapons station are
plainly spelled out in
the
operation under
usual conditions
section
of your -10 manual.
whoops!
it slipped!
The Detail is in the Decal
Mark through COAX AMMO ±EED CHUTE
and write in BREECH BLOCK
I couldn’t hit the
broad side of a barn
on the range today!
I don’t
get it!
hmm…
I just finished the gun
mount assembly go/no go
check yesterday.
I wonder
what went
wrong?
wait’ll you
see what I did
to the fire
control unit
screen!
wow!
you’re
really
heavy!
that’s why you’re
supposed to have
help
doing this!
ugh!
My
back will
never be
the same!
683.02-03.indd
1-2
8/31/09
5:30:12 PM
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