PS Magazine - TB 43-PS-420
PS, The Preventative Maintenance Monthly
ISSUE 420
NOVEMBER 1987
I
;I,
!
1±
1 ±
I
M939-Series Trucks .±
,
Pass the word! M939 5-tonners came with TansmIssion mounting bolts that are
tO light to do the job.
±He original Grade 5 bolts can't B tightened enough to hoLd. ²olts vibra³
LOse ´µ´ and shear of.
T
lEs
t
Fu¶d loS,
gE
D
ge,
b²
·s¸ssioN oR b¹kn
Bl
ºsings.
»uring the next scheduled service, lOK ¼r lOse ½lts, ¾uid LeaKs or evidence
o¿ gasKet damage. »À getÁ the repair job
i
Âhere're any sheared boLts, gasKet
damage or LeAs.
ÿ the probLem is only LOse ½lts, unit mechanics have the
OK
to put in Grade 8
½Lts, ÄÀÄ 5305-Å638-8920, and lÆK washers, ÄÀÄ 5310ÇÈ-É-5033.
Êeplace bolts oneËat-a-time.
Ìhat's right, one-atÇa-time. ÿ you remove all Âhe old bolÂs be¼re putÍing Î new
ones, the whole shebang Ïls out.
8
NoV 87
You
c
get to the ¼ur top
³
Ðough Ñhe Tansmission access dOr in the cab´
Êeach the oÂher eight ½lts ÒÓm uÔdeÕÖÑh using Âhi× hoØeØÙde wreÔch exÚnsioÔ.
_[
_
±²³
²0_·²/8'³' OA
´´
µ
\
±J12"
12 Po´nt µ/¶6" box wRnCh
Ìorque the new bolts to 4ÛÇ49 lb-Ü´
Äever use Âhis much torque on the old
boLtÁ. You'll tWist the heads of and that
.
means a »À repair job.
¸H¹º ¹NF» ¹º ¹N ¸a¼Jm mºGam¼pm½
¸Vm ¾7¿¾¿¾Z »¼À Á5 ºÃà ĻUÅ
¸a¼»m LaÅ ¹F Ä»U D»NƸ Havà a
¼»pÄÇ »Å WŹ¸Ã HalFÈmaº¸É
HÃÊll ºÃND Ä»U »NÃ!
TrucKs Ë̱
Stop Air LIne FReeze-Up
MoistUre in
a
braKe Lines will Òeeze in cold weaÂher and blÆK the lines´
Ìhat's why most trucKs have an alcohol evaÝrator to put alcohol into
a
lines
to prevent moisÞre Òom Òeezing.
ßll tàcás except the Û0-ton M.ß.Ä. use methyl alcohol in theiâ evaÝrators.
ÄÀÄ 6810ËÈ-597-3ã8 gets one gallon. ÄÀÄ 6810ÇÈÇ275Çã10 geÑs a 5-gal
can.
´
M.ß.Ä.
µe
a 50/50
m
o¿ antiäeeze. ÄÀÄ 6850-ÈÇ181-7933, and
denatUred ethanol, ÄÀÄ 68Û0-È-543Ç74Û5.
NoV 8¶
9
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