Navistar MaxxForce 7

SECTION3–INSTRUMENTS,INDICATORS,ANDSWITCHES
AirCleanerRestrictionIndicator
Airrestrictionisresistanceofairowthroughtheaircleaner.
Accurateairrestrictionismeasuredatmaximumairow.
Figure24AirCleanerRestrictionIndicator
Aircleanerrestrictionismeasuredbyanairrestrictionindicator.
Therestrictionindicatormaybelocatedanywherewithintheair
inductionsystemorinstrumentpaneldependingonyourspecic
application.
AirRestrictionIndicatorCalibration
•Theindicatoriscalibratedininchesofwater.
•Theindicatorshouldbetestedperiodically(usingamaster
vacuumgauge)toensureacorrectcalibration.
AirRestrictionIndicatorOperation
•Theyellowpositionindicatorprogressivelyllsthewindow
asairlterrestrictionincreases,lockingatthehighest
restrictionatfullload.
•Whentheyellowpositionindicatorreachesandlocksinthe
redzone,anewairltershouldbeinstalledattheearliest
convenience.
NOTE:Iftheyellowindicatorlocksintheredzone,itisnot
necessarytoshutdowntheengineimmediately,butanewair
ltershouldbeinstalledattheearliestconvenience.
AirRestrictionIndicatorReset
•Oncethelterhasbeenchangedresettheairrestriction
indicatorasfollows:
•Iftheairrestrictionindicatorismountedontheair
cleaner,pushthebuttonontheindicatortoreset.
Page47