PS Magazine - TB 43-PS-721
PS, The Preventative Maintenance Monthly
ISSUE 721
DECEMBER 2012
6
PS 721
DEC 12
7
PS 721
DEC 12
If the lunette isn’t tightened
down
properly,
it
allows
a
twisting motion during towing. It
doesn’t take too much twisting to
damage the muzzle brake’s tow
bracket. The Fx requires a depot-
level welding and re-machining
of the bracket.
You can prevent that expensive
damage by making sure both the
washer, NSN 5365-01-528-9349,
and long nut, NSN 5310-01-528-
9347, are in place. Then keep the
long nut torqued to 350 lb-ft.
C
rewmen, it’s not unusual to see some major temperature ±uctuations when cold
weather sets in. As temperatures fall, so does the nitrogen pressure in your M777A2
howitzer’s equilibrators.
If the equilibrators aren’t kept
balanced during these temperature
changes, it can get really hard to
elevate or depress the cannon for
Fring.
If
the
cannon
tube’s
balance
can’t be adjust +/- three divisions,
call
in
your
mechanic.
He’ll
add
additional
nitrogen
to
the
equilibrators to balance the cannon
tube by following the Maintenance/
Top Carriage/Equilibrator System/
Charging the System procedure in
the IETM’s TM 9-1025--215-24&P.
By the way, you’ll Fnd lots more helpful M777A2 info at this website:
Temperature Change AffeCts
Equilibrator Pressure
M777A2
Towed
Howitzer…
Keep Towing Lunette Tight
M777A2 Towed Howitzer…
Temperature Change AffeCts
Equilibrator Pressure
Use equilibrator
adjustment screw
and indicator
gauge to adjust
equilibrators
during minor
temperature
changes
why won’t
your gun tube
elevate?
c-cause the temp-
temperature’s
dropped
and muh-
my equilibrators
need a-
adjusting!
yeowch!
hey, take
it
easy!
my
towing
bracket
is getting
twisted!
a
loose lunette
on
your m
777
a2 howitzer’s
muzzle brake can cause
no end of
problems!
Twisting motion bends towing bracket
721 06-07.indd
1-2
11/6/12
11:20 AM
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