PS Magazine - JANUARY 1977
PS, The Preventative Maintenance Monthly
ISSUE 290
JANUARY 1977
't
·I,
Sprocket repair kit NSn 1005-00±
169-1853
for
the
7.62mm
rotary
ammu²itio²
drum
of
your
M28Al/28A1El
armame²t
sub³
system is a o²e±time deaL.
Its o²Ly i²te²t w´s to update earLier
ammo drums µ.
. a²d if yours has
·
the
square key betWee² the sprocket shaft
a²d sprocket, it's updated¶
Troops i² ma²y cases are orderi²g
the Kits for use as repair parts .
.. to the
poi²t
where
the
kits
are
rapidLy
disappeari²g from the suppLy system.
You caR beat the cru²ch by order¸²g
parts
separateLy,
i²cLudi²g
the
sprockets¶
Fact is, i¹ you have kits o² order for
use as repair parts,
yoU ca² heLp
co²siderabLy by ca²ceLLi²g the reQºest
a²d goi²g after the separate parts yoU
²eed.
»emember:
O²ce the kit
is i²¼
staLLed, you ²ever ²eed it agai².
½ea²whiLe, here¾s some i²f¿rmaÀ
tio² to heLp you figUre oºt whether
you ²eed to repLace the sprockets:
»epLace the Upper sprocket if the
dista²ce from the outside of the shaÁt
to the edge of the tooth o² the tooth
over the sprocket key is Less tha²
9 16
20
ÂepLace the Lower sprocket if the
the roLL smooth (²o burrs) .¶¶ as sooÃ
tooth oveÄ the sprocket key is Less tha²
as yoU spot it¶
±5 /32
-
i²ch Lo²g¶ Åhe other 4 teeth mUst
measUre at Least
±7 ²32
i²ch from the
shaft to _the edge of the tooth.
KEY
·
LOWER SPROCKET
Æidth of the teeth ca² be ²o LeÇÇ
tHa² È/É tHe WidtH oÁ tHe origiÃÊ˶ ÌHe
tooth shouLd be at Least
³ ²
³
6
iÃcH Wide
¶Í. witH ²o burrsÍ
ACCEPTABLe
:
EXCEsSIVe
Îach tooth must be ²o Less tha²
tOOtH WEAR
1
TOOTH WEAr
mi²imum size. If o²e is ²ot, repLace
REMAINING TOOtH IS
1
leSS THAN±!
Ï
the sprocket¶
MoRE THAN 1/3 OF
²tOOth WIDTH
NSN 3020Ð00-0Ñ3Ò1042 getÇ you
QRIGINAl tOOtH WiDTH
:
REMAININg
the Upper sprocket, a²d NSn 3020Ð
n·
N
±
- ´µ
00-003Ð1041 gets you the LoÓ
Ô
r Õ²e.
-±1
±
¶T
i
u
-± _
i
Teeth o² ²ew sprockets te²d to
±
I
_
²
i
³
form a roLL or foLd at the edge of the
±
tooth aÁtÖr i²itiaL Áiri²g ¶¶¶ or the ²ext
firi²g or tWo. No sweat. FiLe or sto²e
tOOtH M
UST BE AT lEAst 1/w³N ´IDe
WEAPONS STORAGE
'
CABInETS
Your CLass 5 Æeapo²sCo²tai²er×
ØSN 7110ÐÑ0-931Ð0ÙÙ0Úgets speciaL
atte²tio² whe² you tur² it i², traÃÇfer
it to a²other U²it, or Whe² itÛs emptÜ
a²d ²ot i² use. You must set the
combi²atio² to 50±25-50ÚLike it says
i² para 2Ð17d, A» 380-5¶ If you doÝt
cha²ge the combo to these Çta²dard
²umbers you couLd be footi²g tHe biLL
for damage a²d repairs to the Locki²g
mecha²ism ²ecessary to get it ope²¶
Cra²k this combo biz i²to your u²it
SOPÚif it¾s ²ot aLready i² it¶
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