PS Magazine - TB 43-PS-442
PS, The Preventative Maintenance Monthly
ISSUE 442
SEPTEMBER 1989
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J
.
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,
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OH MY
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±²
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´CHI NG
60Ll³1
½
³
.
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Y
o
u
better be gOOd tO M60 bOlts, armOrers. They're in very shOrt supply± If
A bOlt's ru²ned, ²t will be A lOng time bef³re yOu get A replAcement. ´hAt meAns
An M60 wOn't be fir²ng.
Dry Firing is the chief reAsOn bOlts Are gOing tO the junkyard± When tHe bOlt
slAms f³rwArd On An empty chAmber, the bOlt lOck²ng lugs Are dAmAged, As well
As the bArrel sOcket ANd the OperAting rOd tOwer.
StRess tO yOur unit's gunners nOt tO dRy fµre. GO Over with them hOw tO Ride
the bOlt f³rwArd (hOld²ng the chArging hAndle tO the reAr, squeeze the trigger
And eAse the bOlt f³rwArd) when the chAmber's empty± ¶sk peOple like the ·ire
teAm leAder, squAd leAder, And plAtOOn sergeAnt tO tell gunners nOt tO drY f²re±
¶nd pROvide dummy rOunds ¸r ¹nct²On testing±
New Inspection Cr´teria
ºO help Old bOlts stAy in ActiOn duR²ng t»e shOrtAge, ¶MCC¼M hAs
temporarily
chAnged the insPectiOn And repA²r criteRiA On bOl½s ²N Steps 1
T
3
On ¾Age 2-49 And ¿epAir Steps
µ
And 2 On ¾Ages 2-50 And 2-51 in TM
9-1005À224-24Á ÂeReÃs hOw the criteriA gO:
M²nOR ch²ps, dents, ANd gOuges are ¼K On the tOp O· the bAck s²de O· the
bOttOm lug± StOne them smOOth±
16
SEP 89
M²nOr chips, dents, And gOUges Are nOw ¼K At tHe leAdinÄ edge OÅ tHe bOtÆOm
lug if theY Are with²n
¶/s
inch Of tHe fÇOnt Or sides Of the Lug. ÈOu cAn sÆOne
them smOOt» As lOng És the rOunded AreA Of tHe lug is nO ÊOre ÆhAn
·
/
·
2
inchË
Ìse yOur mAcHinist rule tO meAsureÍ
CHips, dents, Or gOuges beyOnd tH²s AreA mAke tHe bOLÆ Unserv²ceAbleÎ
CHips, dents, Or gOuges Are ALsO ÏK On the tOp lug ²f they're wiÆHin
¶/s
incH
Of the lug's leAding edge± They cAn be stÐned smOOth As LOng As the rOunded
AreA Of tHe lug meAsuRes within
·
/
·
2
inch± Ñf t»ey're beYOnd this AreAÒ the bOLt's
unserviceAble±
¶fter Any stOn²ng On ÆHe leAding edges Of the Lugs, A bOLÆ must be gAged bY
DS f³R heAdspAce And firing p²n prOtrus²On And ÓunctiOn checked±
ÔO crAcks Are AllOwed On the bOlt (v²suAl inspectiOn Only)±
Stripping lug
BoLTs exhibiTing
complETE loss of
oriGinal RadiUs
s±²AcE ArEA d±E
TO cHiPpinG MAy
ContinUE To
bE ±sED
SEP 89
•
No f³l³nG oR GRindinG
•
NocRAcks
fµ¶¸!¹º
•
´³GHl³GHtED AreAµ cAn
bE stonED
•
No stoninG, filinG¶ or
GRindInG on bolt
locKinG s±²Aces
·EpA¸r Cam arEa ¹y
DrEss¸nG raisED ºr rºugh
surFacEs ¹y sTºn¸»g
·ounding/m±TilAtion of tHis ¹olT
LockinG s±²AcE CAn CausE damagE
To t¼E MAT¸nG LocKing su²AcE ¸n ThE
¹arrEL socKET. ½his co»diTion shAll ¹E
caUsE For rEmovi»G ¹oLT from sErviCE
¾owEr r¸ghT CornEr may
¹E REpairED ¹y sToni»g
a»y ¹Urrs or Chips
¸7
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