PS Magazine - SEPTEMBER 1973
PS, The Preventative Maintenance Monthly
1973 SERIES, ISSUE 250
SEPTEMBER 1973
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Always use ofset screwdriver FSN
5120-287±2130 to get the obturator
seal out. Put a bl²de o³ the screw´
driver behind the seal and gently pull
iT toward you. Be very careµl Hot
to damage the seal w¶en you pry it
out. I· it sticks, Work gently until
it loosens¸ Be caReµl not to use too
much ·orce. ¹emember, a reGular
screwdºiVer is no good »r this Work.
I³ your ofset screwDriver ¼s miss½
ing, orDer a new one¸ It's listed with
your primary armament tools and
equipment on page B-9 o³ Ch 9 to
your ¾M 9±2350±230±12 (Jun
66).
Store it in the tool bag.
Once you get the obturator seal and
its seat in good shape, keep 'em that
way with cleaning and lubrication,
like so:
1¸ Open the breech anD take out
the obturator seal.
2¿ Àit¶ a so³t rag, wipe all Dirt,
powDer anD cºuD Áom the obtuºatº
seal, seal cavity and surºounDing
exposed sur³aces. ¹emember, no
steel Ãool or other abºasive.
3¸ Look everything over. Äake
sure it's clean. (You need aÅl t¶e lig¶t
you can get Ær t¶is. I· you canÇt get
more t¶an a Èas¶lig¶t, at least get
one wit¶ Ées¶ batteries.)
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Put a coating o· lubricating oil
(PL±S) on all tËe ÌleaneD areas;
1,-±²³_.´µ
sprEaDing it eVenly Wit¶ a ºag or
brus¶. Make sure you get plenty o·•ÍÎÏÐ
lube on all Ñces oÒ t¶e ÂbturatÂr seal
anD make sure t¶e seal seat is Well
lubeD. (I· you Don't plan t Ӻe Ô¶e
main gun ·or a mont¶ or more, use
grease, aircra·t anD insÔrument,
(ÕIA), insteaD o· t¶e PLÖS.)
5¿ Sna× the obturatÂr seal baØk
into place.
6.
Àit¶ t¶e ¶anD Ùrank, o×en anD
¶·¸¹º»¼½
close t¶e breech c¶amber seVeral
times to make sure iÔ WÂrks in a
smoot¶ and normal Way. (¾¶e breec¶
will not completely clÂse i· t¶e seal
is nÂt ³irmly seateD in t¶e gun/
launc¶er tube retaining grÂoVe.
7¿ LeaVe breec¶ backeD out but
not rolleD ÂVer. (¾¶is lets air circu´
late and reDuces conDensatiÂn.)
Ú
¹e´
tuºn t¶e ¶anD Ørank ÛÂ abÂut Ô¶e Ü2
o'clock lockouÔ position.
If you're in a place wheRe vaRiations in tempeRatUre cReate a
lot of condensation, take oF the gUn laUncheR dust sHield and
dry everytHing that's wet. Make sURe the exposed paRt of the recoiL
mechanism sleeve Has no coRrosion oR Rust. YoU can givE the ±xt±R-
nal sur²ce of the exposed sLeeve a thin
coai
of M³´µGµ81322 ¶Reas±.
FSN
9150µ·8¸µ7724 g±ts yOU n 8µoz TUbe¹
²3
'· .
±²
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