Navistar MaxxForce 9

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DIAGNOSTICMANUAL

Intakeairow:FilteredairenterstheLPcompressor,whereitiscompressedanddirectedtotheLPCAC

(ifequipped).CooledLPairenterstheHPcompressorwhereitisfurthercompressedanddirectedintothe

HPCAC.CompressedairthentravelsthroughtheETVandtheintakethrottleduct.Thissystemprovideshigh

chargeairpressuretoimproveengineperformanceandtohelpreduceemissions.

Exhaustgasow:TheHPturbochargerisconnecteddirectlytotheexhaustmanifoldthroughtheHPturbine

inlet.ExhaustgasesexittheHPturbineoutletandaredirectedtotheLPturbineinlet.TheHPturbochargeris

equippedwithasinglewastegate,whichiscontrolledbypneumaticactuator.Whenboostdemandislow,the

wastegateisopened,allowingpartoftheexhaustgasowtobypasstheturbine.

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