Mack MRU - Air Inlet System Ducts, Hoses and Clamps; Chassis-Mounted Charge Air Cooling (CMCAC)

34MAINTENANCEANDLUBRICATION
AirInletSystemDucts,HosesandClamps
Every45daysor150hours,whicheveroccursrst,inspectallductsandhosesfor
signsofleakageorchang.Replacehoseandrepairorreplaceductswithholes.
Tightenclamps.
Chassis-MountedChargeAirCooling(CMCAC)
VehiclesequippedwithCMCACrequirethefollowingpreventivemaintenance:
•Daily—Removeallinsects,leavesandotherforeigndebrisfromthefrontalarea
byusingarmbristlebrushandsoapywater.
CAUTION
DonotuseacausticsolutiontocleanCMCAC.
•Every45daysofusageor150hours*—Checkallairductingandgasket
connections.Properhoseclamptorquingprocedureistotightenhoseclampnuts
untilspringisfullycompressed3.9to4.5N.m(35–40lb-in).
•Every180daysofusageor600hours*—Checkforcracks.Checkthemounting
bracketsforsecurityandcondition.Torquethemountsto41N.m(30lb-ft).Check
corensforexternaldamage,debrisorsaltcorrosion.Usearm,bristledbrushto
removedsaltcorrosion.Useairpressuretocleancoreblockageduetodebris.
*Whicheveroccursrst.