PS Magazine - JANUARY 1984
PS, The Preventative Maintenance Monthly
ISSUE 374
JANUARY 1984
I.
1
21±- & 5²Ton trucks ³´³
Take away your skeleton and you
won'± go far, right? You Reed that
"FAe² to hold eve³g toge´her. It's
what your body's buµt on.
Same goes fOr your truck ¶aMe. It
holds ever·tHng together. It's what your
truck's buµt on. ¸our ¹ºuck won't go far
with a bum ¶ame!
The ¶Ae's not much more th»n
µ
20
long
steel
beams
with
somE steel
crossmembers-aL ¼stened together
w½th welds, rivets aNd, in some places,
bolts 'n' nuts. The ¶ame's tough. I¹'s
got t0 be-to carry a¾l of that weight
aNd to take the str¿n of twisting Às you
travel ÁÂer rough terrain.
With enough strain, tho, that tough
Se
gets ¹irÃ-¼tigUed. Äve¹s stretch,
JAN 84
loosen, break, fall out. Bolts 'n' nuts go
bolt there Åd » CaÆKÃ wÇld someplace
pre¹¹y much the same way. The beÀms
else Mu¾tiply Åd knocK you out of youÈ
aNd crossmembeÉ crack at rivet and
bolt holesÊ WËlDs crack. Ìhere there's
rust, the met»l weakens quicker.
Íomplete ¶Ae fÎlure Ïn sÐ with
the weaKeÑng of just one connecting
point-a loose rivet or bolt, a cracked
weld. Str¿n is added to nearby rivets,
bolts, Åd welDs. It's a ch¿n ÒnÓ
Ô½Ke a row of dominoes falÕng.
PMCS: Loose Rivet
=
NMC
It's no surpÖise then that your truck
is rateD not mission capable if only one
rivet ½s loose-or one bolt is loose, or
one welD is cracked. Th½s'¾¾ be showing
up in your
¶·0
T× P×ÍS.
You've got to nip ¶ame failuÈe Øn the
bud-beÙre a broken Úvet here, a loose
JAN 84
Mission!
So yoÛ Üget out aNd get underÝ to
detÞ those weak ßoints. ¸ou look. You
test Ùr looseness àith áour ângers.
You'L probably nã a äÀsåight to ænd
al
oç those èive¹s, bol¹s Åd welds. éveê
one of 'em is iMßoºtant!
ëhìk Ùr space under the íVet heaD.
The rivet head musî beïiGht against the
beam or crossmember. ðacKs in the
ñetò around the rivet meÀN órouble.
ShØnô metal around the rivet meaNs the
rivet's loose, aLowing the riõet or the
crossmember to söi÷. Shiny meø òong
eDges of crossmembers ½s » sigN of
shi÷ing between the crossmember aND
main beÀm.
Broken rivet? ùissing rivetú Bolt
loose, broKen, or missing? Ír»cûeD
welD?
üepor¹ 'emýever· oneýon your
DA
þorm
¸¹º
21
ÿet 'em ĀeD.
FM!: CiNG»¼½LdE¾
¿mPOÀg ÁÂÃÄÅÆ ÇÈ
ÉHÊ fËÌ
•
ÍÎ$ ÏR
ÐÑÒÓÔÕÖ ×B ØÙ
ÚÛÜÝ
ÞßàáWâã
j
ä'åæçèéêëìí,
îïðñ YòUó ôõö
nmc(
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