PS Magazine - TB 43-PS-455
PS, The Preventative Maintenance Monthly
ISSUE 455
OCTOBER 1990
Start the tRuck's engine and let it idle at 625 ±PMs.
If
the pUmp Is good,
yoU'lL get a readiNg between 18 and 25 in-Hg. Any Reading undeR 18 means the
system does not have enoUgh vacUUm pRessUre to shif Right. The pRoblem is in
the vacUUm pUmp oR hoses and Fittings. ±eplacement pRocedURes ²³ the pUmp
and hoses aRe iN PaRa
3-7
and PaRa 3´21 oF TM 9´2320-289µ20.
Pu¶p pRessURe good? Move on to the RegUlatoR valve. ±econnect the bottom
vacUUm hose at the Reg·latoR valve. ¸nhook the top one at the connectoR. ±·n
the coppeR tUbing stRaIght into the ¹ose connector on the RegUlatoR valve.
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WI»¼I¿ LIÊI»s OÈ IÇ »¼eÈe I¾ nO VÉC·UÊ
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VÉlveÁ ÔÕÔ 4Ö2Ã-Ã1×ÀØÖ×ÙÖÚÙÌ
16
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WreckeRs .²²
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Towing Update
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ÝòxÜÊóÊ •ÎEED LÜÊÜô• Âà ÅÄõ O¿ »¼E ¼ÜG¼WÉY önD Àà ÅÄõ÷ø =
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1
rt
YES
M928, M934, m936
NO
NO
NO
m813/A1, m818
YES
YES
YES
M8±4, M8²5, M³±6, m8±7
YEs
YES
NO
m8±9, m820/A±/A2, m´21
NO
N
NO
mµ3a2
yES
YES
N¶
ÆÇ yOU neeD a Copy oF the messageÁ ¾ee yoUR local
ÑA üýÅ þoGIs»ICs ãssIs»anCe ±epResen»atIVe oR wRIte:
1±²³´
OCT90
US Ar·¸ t¹ºk-Au»o·o»ive Co··¹ºd
·
A¼N: AmStA½Cm¾S
W¹rren, Ml 48397¿5000
17
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