PS Magazine - APRIL 1979
PS, The Preventative Maintenance Monthly
ISSUE 317
APRIL 1979
I
@W@O
Iw®fOlU±²f®
Fire control instRuments not liSted
In TM
750-1±6
bUt that reqUire
pURgiNg are VV±-1 laser Rangefinder
for
M60A2
tank; collimatoR
MlAl
(raDIoactive);
Ml3²
pantel, and
Ml38
elbow telescope,
(Ml98
howitzeR);
VVG²2 la³er ra´gefinder, the
M6±
(VµLCA¶) sigHt· the
M55
laser
gUnnery trainer and second genera¸
tion passi¹e periscopes
m35Al
and
M36Al.
All components of the
AN/VVG³1´
laser rangefinder on the
µ551Al
±heridan are pUrged ºor
10
mi»UtEs a¼
7
P½¾. YOU c¿arÀe them aÁ
3¶5
PÂÃ
After yoU'¹e pUrged the instrUmE»tÄ
Åif it is not eqUipped with ÀasÆ
kets/seals), lightly coat the threadsÇof
No gasket?
Use sealing
compound
the exhÈUst port screw with seaÉÊ»À
compoUËd ¶±¶
8·30³00³275³¸11·
(or eqUi¹alent) and
Ì
screw it Back in.
(¶ÍTÎ: ¾f the entrance or ExhaUst
port screws ha¹e lost theiR gaskets
they may let nitrogen escapeÏ ¾f tÐis Ñs
happening, order new screw and
gasket sets from table
2¹3
on pages
21-
22
of yoUr T
M 75º0-11»¼
ÒÓRgIngÔgettIng tHe dÓst, mÕst,
wateR, etcÖ, oUt of yoUr fIre contRol
InstrÓmentÔIs only Hal× of tHe battle.
A×teR yoÓ pURge the instrUment yoU
neeD to bUild UØ the pressUre inside it
³o it will ResIst the in¹asion of dÙst,
mist, water, etc., from the oUtside. YoU
do tHis by cHargIng it with nitroÀenÚ
Ûefore chaRÀinÀ make sure the
exhaUst ports are screwed shUt.
ÜÝw set yoUr pressUre REÀuÉatoR
¹aɹe to the charging ÞßEssußEà
»eaRly always
1
P±¾áand charÀE foß
thE reqUired timE wâich may BE ã»Éä
20
seconds. (ået the eXact time fRoæ
yoUr
TM
750½116¾)
Do ¿ not
overchargE or you couLd dÀÁage The
insTruÁenTs¾
±çµèèé¶G ÍFF ê¶éèëÍGì¶Ô
Has tHe proper ³afeíy De¹IcesÔdÓst
îompletely close tHe ¹al¹e on the plUg and/oR ¹al¹e pRotection capï
nitrogen cylInDerï Ípen tHe ¹al¹e on
the lowðpressUre side of thñ regUlator
jUst a lIttle. All tHe pressÓrò Will tHen ëAóéÍAîèéVì Féëì îôõTëÍö÷
èhese iøùúms aRe pUrged tHe same way
nonûRadioactI¹e ones areü èhe only
³pecIal pRecaUtion wItH radioacti¹e
×IRe contRol Items Is tHat tHýy sHoUlD
notþ ÿe pÓRgeD If tHe RaDIoacíI¹e ¹Ials
Āre bRoken. én that case, tUrn tHem in
tHe way it tell³ yoÓ In tHe weapon
Â12
èMā
Aöé¶ÎMÎõè óÎVéîαÔYoU may
bleed of× botH tHe HIgH and lowû
Ha¹e woĂdered I× alinemănt de¹Ices
pRessUre gages. é× yoU DonĄt bleed off ³UcH as the
MÃ40
and tHe
XM ±39
all of tHe pRessÓre, tHe rUbber ĂeeD to be pÓRgeD. At present, no.
DIapHRaąĆ In yoćR pRe³³URe regÓlatoR A¶Göì FéTèéĈGÔèHe angle fittIĂg
wIll be ÓnDer a cĉnstant strain. This Ó³ed wIíH tHe recoĊċ chargIng set
³HoUlD ne¹eR be UseD on tHe pÓrging
³et becaU³e It Ha³ steel tHReaD³ whIcH
wIll Čt tHe lIgHí metal tHRead³ on ×IRe
control čQUIpmeĂĎďĐ
HIS FiRT J£QUE5t
±s fOrA CoP²³
AR 70±·68!
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