7-MAINTENANCE
Airsystemoverview
Aircompressor
Theaircompressor(locatedonthesideoftheengine
towardthefrontofthevehicle)isusedforthefoammarker
system,boomblowout,andthecabairsuspension.
RAIL18SP00245AA1
Aircompressordischargeinspection
Allaircompressorshaveasmallamountoflubricatingoilcarryoverwhichlubricatesthepistonringsandmoving
parts.Whenthislubricatingoilisexposedtonormalaircompressoroperatingtemperaturesoveraperiodoftime,
thelubricatingoilwillformvarnishorcarbondeposits.Ifthefollowinginspectionsarenotdone,theaircompressor
pistonringswillbeaffectedbyhighoperatingtemperaturesandpressuresandwillnotsealcorrectly.Locatetheair
systemtanklocatedinsidetheright-handrearcorneroftheenginecompartment.
1.Draintheairsystemtoremoveallpressure.
2.Removetheairdischargelinefromtheaircompressor.
3.Measurethetotalcarbondepositthicknessinsidethe
airdischargeline.Ifthetotalcarbondepositexceeds
2mm(0.08in),cleanandinspecttheaircompressor
cylinderhead,thevalveassemblyandthedischarge
line.Replaceifnecessary.Contactyourdealerfor
properprocedures.
Airtank
Drainthewaterfromtheairtank(1)dailytopreventcor-
rosioninsidethetank.Opentherearbellypandoorto
accesstheremotepetcock(2)locatedatthebottomright-
handcorneroftheengineframe.Opentheremotepet-
cocktoremovemoisture.Closethepetcockafterallmois-
turehasbeenremoved.
RAIL14SP00816AA2
RAIL14SP00817AA3
7-20
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