Toro 74920 TITAN ZX4820 - Drive System Maintenance; Hydraulic System Maintenance

DriveSystem
Maintenance
CheckingtheTirePressure
ServiceInterval:Every25hours—Checktirepressure.
Maintaintheairpressureinthefrontandreartiresas
specied.Uneventirepressurecancauseunevencut.Check
thepressureatthevalvestem(Figure56).Checkthetires
whentheyarecoldtogetthemostaccuratepressurereading.
Refertothemaximumpressuresuggestedbythetire
manufactureronthesidewallofthecasterwheeltires.
Inatethereardrivewheeltiresto13psi(90kPa).
Figure56
1.Valvestem
HydraulicSystem
Maintenance
HydraulicSystemOilSpecication
OilType:ToroHYPR-OIL®500or20w-50motoroil.
SystemCapacity:approximately4.495liter(152oz)witha
lterchange.
Important:Useoilspeciedorequivalent.Otheruids
couldcausesystemdamage.
CheckingtheHydraulicOil
Level
ServiceInterval:Every25hours
Checkexpansionreservoirandifnecessaryaddoiltothe
FULLCOLDline.
G010253
1
2
3
Figure57
1.Expansionreservoir3.Engine
2.FullColdline
ChangingtheHydraulic
SystemFilterandOil
Thelterandoilarechangedatthesametime.DoNotreuse
oil.Oncethenewlterisinstalledandoilisaddedanyairin
thesystemmustbepurged.
Thebleedingprocessisrepeateduntiltheoilremainsatthe
FULLCOLDlineinthereservoirafterpurging.Failureto
properlyperformthisprocedurecanresultinirreparable
damagetothetransaxledrivesystem.
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