Mack MRU - MAINTENANCE AND LUBRICATION

MAINTENANCEANDLUBRICATION27
MAINTENANCEINTRODUCTION
ThishandbookcontainsmaintenanceinformationspecictotheNaturalGasV ehicle
andEngine.Forrecommendedlubricationchangeintervalsandproceduresfor
gearoils(transmission,rearaxlecarrier[s],frontdriveaxlecarrier,transfercase
andywheelPTO)orothermaintenanceschedulesorproceduresnotincludedin
thisportionofthehandbook,refertotheMaintenanceandLubricationManual
(21394653)oryourvehiclemodel’sOperatorHandbook.
DAILYLNG/CNGFUELSYSTEMCHECKS
CheckforMethaneLeaksorLossofVacuum
TheLNGandCNGfuelsystemsarepressurizedsystems.Anydamagetothefuel
deliverysystemmayresultinleaks.Allthetubingcarryingliquidorgasfuelfrom
thefueltankstothevaporizerarestainlesssteel.Thetubingfromthevaporizer
throughouttheremainderofthefueldeliverysystemisspecializedhighpressure
tubing.Anydamagetothissystemshouldberepairedassoonaspossible.
Duringthedailywalkaround,checkforanyleaksordamagetothefuelsystem.The
appearanceofavaporcloudaccompaniedbyahissingnoisemayindicateamethane
leak.Inspecttheoutsideofthefueltankforfrost(LNGonly).Afrostedtankindicates
thattheinnertankisleakingintotheoutertankortherehasbeenalossofvacuum.
Openthetankdoor;iftheEvacuationPlughaspoppedout,thetankmustbeserviced.
Aleakingconditionrequiresservicebeforethevehicleisoperated.
WARNING
Donotoperateavehiclewhichhasa
methaneleak.
Note:Somefrostingandsweatingisnormalaroundtheplumbingttingsinthe
shroudedendofthetank.