PS Magazine - SEPTEMBER 1981
PS, The Preventative Maintenance Monthly
ISSUE 346
SEPTEMBER 1981
Some drivers of M915-series trucks
aRe having a hard time learning that
these .trucks are DIFFE±ENt F±Om any²
thing ³:hey've ever operated before´
and theyµre tearing up clUtches some¶
thing fierce·
The transmission clutch is aUto²
matic¸ ¹tºs disengaged»discOnnected
»when the engineµs ope±ating at low
speed»about 775 ¼PM·
Then, As yOU increase engine ¼PM,
the clUtch starts tO engage½
B¾t the clutch is nOt fully engaged
Until engine ¼PM gets up to arOUnd
1200¿
This means the clutch is slipping
until the engine reaches 1,200 PMÀ
depending on how much OF a load iÁÂÃn
it»like traveling uphiLÄ, Or carrying or
toWing a heavy load·
Åeedless clUtch wÆa± and damage
Ç
are a sure bet if yoU Ope±ate under load
beÈWeen 775 and 1,200 ¼PM For
lOngerÉ than ÊË secondÌÍ Îatch tHat
¼PM hand on your tachOG±aph!
O'CoURSE . KN±W en±uGH T²
k³´P MY µgI¶· rpm ¸¹ sº
th» ¼lA½¾¿iÀÁÂÃÄ cLÅÆÇ
wÈÉÊË
SUP!
'
Ïact is, some drive±s find that itµs
best to Keep engine speed up to 1,500
¼PM when OÐeratinÑ UndÒr heavy
lOad to prevent clUtch slippaÑe»and
clutch damaÑe¿
ÓlsO, they let up slightly On the
accelerator pedal when shifting· This
makes for smOothe± shiftingÍ
The fine points Of clutch operatiOn
are spelÔed Out in thÕ operatorÖs
manual×TM 9ØË3Ë0C27ÙÚÊ0, ÛaÑe 2Ø
18Ü
Ýelpºs
You sUÞerØ
VisorYßtYpes wHoµre reÌÞOnsiàÔe For
tHe "ca±e and feeáinÑâ oF tacHog±apHÌ·
ãHese are the cOmàination Ìpeeáä
Oåeter ØtachometerØoáoåete± -æÔocç
±eco±áing inst±uments noW in many
èrmY trucçs»sucH as tHe M9éêØ
se±ies trUcçs·
The
tacëograph
manUfacturer
offers info that can smOoth the road
fOr bOth you and yoUr sUpport¿ This
includes instruction in reading tëe
charts and also a listinÑ Of factory
service station
VOo-ARGo Instruments, inc.
980 Br±±ke Rd²
_
W³nchester´ VA 22601
ÌÍ ÎaÏÐ
(CMµE¶·¸aL)
¹7º»
6Ñ2-170Ò,
ÓÔÕ DÖ×ØÙÚÛÜ ÝÞ ßàá
B
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