PS Magazine - TB 43-PS-575
PS, The Preventative Maintenance Monthly
ISSUE 575
OCTOBER 2000
7.
After the gun fires, turn the nut to
the right two more clicks and
stop
.
8.
Take out the gauge and put on the
back plate. Cock the gun, then ease the
bolt forward.
9.
Recheck the timing two more times
with the back plate on. If the timing
still isn’t right, do the early/late timing
procedure one more time.
Still no luck? Tell your armorer.
Something’s wrong.
4.
Pull the bolt back only far enough
to insert the FIRE gauge, and slowly
release the charging handle.
PS 575
49
OCT 00
PS 575
48
4.
Pull the bolt back just far enough to
take out the NO FIRE gauge and put
in the FIRE gauge with the beveled
edge against the barrel notches. Slowly
release the charging handle.
5.
Press the trigger. If the M2 fires,
timing is OK. If it doesn’t fire, you
have late timing.
Early/Late Timing
Never cock your M2 with the back
plate off.
The driving spring rod could
go through your chest. The bolt must
be
forward
before you take off the
back plate.
1.
Take the gauge out of the re-
ceiver. Cock the M2, then ease the bolt
forward.
2.
Take off the back plate.
3.
Turn timing nut all the way down
to the left.
6.
Turn the timing adjustment nut one
click to the right. Push up on the trig-
ger bar. Continue to alternate turning
the timing adjustment nut one click
right and pushing up on the trigger bar
until the M2 fires.
Mobile Subscriber Equipment . . .
You must ground all three with separate ground wires and rods to avoid a
possible shock. Not grounding the signal entry panel can create an additional
problem: signal interference.
And while you’re at it, look at the terminals and ground lugs for dirt, grease,
corrosion and paint. They can kill a good ground connection. Remove dirt and
grease with solvent, NSN 6850-00-281-1985. Use fine sandpaper or a wire brush
to get rid of any corrosion or paint. But be careful using these abrasives. You
could do more damage than you do good!
1.
Generator:
Run a ground wire
from the ground terminal in the
terminal box to the trailer’s ground
lug. Then run another ground wire
from the trailer’s ground lug to
earth ground.
2.
S-250 shelter’s
power entry panel:
Ground the E1
ground lug.
3.
S-250 shelter’s
signal entry panel:
Ground the E1
ground lug.
Here are
the places
to ground
the LOS or
RAU.
..
5.
Push up on trigger bar. Gun
shouldn’t fire.
Armorers, if you have M2s in
your arms room, copy this article
and use it to train your M2 gun-
ners. It will help protect your unit
and your M2s.
f your mobile subscriber equipment (MSE) line-of-sight (LOS) radio termi-
nal or radio access unit (RAU) is not grounded in
three
places, it’s not grounded
safely.
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