Volvo VN Specifications Page 274

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OPERATION265
Brakes
Draggingbrakesincreasefuelconsumption.Theyshouldbecheckedregularly.Itis
importantthatthereleaseactionoftheairvalvesisfastandthatthemovingpartsof
thewheelbrakesarecheckedforgoodadjustmentandoperation.
Axles
Anaxleoutofalignmentincreasesrollingresistance.Regularlycheckthefrontwheel
alignmentandaxlesonboththetractorandtrailer/semi-trailer.Iftheyarecorrect,
therewillbelessrollingresistanceand,therefore,lowerfuelconsumption.
Agoodsignofanaxleorwheeloutofalignmentisuneventirewear.Checkthetires
often.
Engine
Faultyorincorrectlyadjustedenginecomponentsincreasefuelconsumption.Thelist
belowgivessometypicalcomponentsthatcaninuencefuelconsumption:
Blocked(ontheoutside)chargeaircooler/radiatorpackage
Faultythermostat
Blockedfuellters
Blockedairintakelter
Faultyinjectors
Dirtyturbocharger
Airinfuelsystem
Faultyfuelsupplypump
Faultyfuelreliefvalve
Faultyfanthermostat/clutch
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