PS Magazine - MARCH 1974
PS, The Preventative Maintenance Monthly
ISSUE 256
MARCH 1974
CANNON ASsEMBLY
GENeRAL
-
rust±d o² co²²od±d;
bulg±d o² oUt of ²oUnd
(dummy
round. should paSs freeLy thru
length
±
of tube)²
BORE
-
Di³
o² powd±²•Foul±d;
ex´
cesSIve oIl puddle;
pitt±d mo²±'n
3/8 Inch wIde and 0µ010 Inch deep¶
BARRE·
R
I
N³
´
B±nt o² b²ok±n;
won't screw smoothLy on barrel¸
F¹R¹NG P¹N º»em¼Ve ½r¼m ¾aS¿
CaÀ WITH S¼Ck¿T H¿ad ÁCreW k¿Y,
ÂÃN 5Ä2Å
Æ
2
4
Å
Ç
5274È
-
ÉItted, burÊ
red,
c²ack±d, d±fo²m±d o² b²ok±n;
st²ipp±d th²±ads; won't s±al gasµ
¶ight.
BARRE· MË9 oÌ M2ÍAÎ
-
ÏIcKedÐ
D±nt±d o² c²ack±d;
wornÐ burred or
st²ipP±d TH²±ads;
neeÑs lube; unÒ
lubeÓ or paInted threaÓs and bearÔ
Ings; obscureÓ Õr mIssIng whIte
paInt marKers 1Ö Inc×es and Ø1
IÙcheÚ from barrel enÓµ
ÛAÃÜ ÝAP
-
ÞooseÐ Óenteß oà
c²·ck±d;
rougá âr ãurreÓ ãall proä
jectIon;
St²iPp±D tH¸±a¹s; l±·kS º·s
ålooK for æpçwÓer burns around
brazIng seal aÙÓ fIrIng pIn)²
Note: Never mix yOur basic mOrtar cOm-
pOnents with th±se of AnOther Mortar.
FOr easy identi²catiOn, cOlOr code yOur
cannOn³ baseplate and mOunt wIth shOrt
strips Of cOlored tApe Or small Pai´t
µatches¶ ("But ·rst be sure all the seriaL
numberS
I
check Out wiTh yOur records¶)
±IGHTUNIT M53
or
M34A2
RUèÛéR éêEÃë
¹
é·
ì
í
ìeterIoÔ
rated, moLdy, cracKîd, loose
missing»
·éïé·
ð¹A·
Ý
OðERÃ
ñ
òióôõ wonöt
snap Into deten÷ In both posItIonø¸
¼½V½¼ V¾¿¼À-Á²OkÂn;
lçùseú
ûE·EÃüOÉE MOUNû
ýþÿĀāNĂ ·AûÝă
Ą
ąIĆÓsć
øOk±n.
ìOĈEûA
¹
· èRAÝĉEûĊ
ċIcKeÓČ čurĎ
ďĐÓ,
ÄÂÅ O² òOk±n;
đaInĒeÓú
GENé»A·
ē
ìIrTy, corroded or rustĔ
ed; scratched, chIpped or bLIstered
paInt; wet;
missing pa²ts»
REû¹Ý·E ¹··UM¹NAû¹NG ĕ¹NĖėĕ
Ę
ęnsealed; cracKed or
b²ok±n;
bent, loose or offĚcenter InstruÔ
ment lIght hoLÓerµ
A
Z
¹MU
û
ë ûëRėĕOUû
MéÝëAN¹ÃM ºM34A2
oěĜy)
Ę
ĝunĞeÓ up;
øok±n;
woğĠt mesġµ
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