Toro 74920 - Hydraulic System Maintenance; Checking the Hydraulic Oil Level; Changing Hydraulic System Filter and Oil; Removing Hydraulic System Filters

HydraulicSystem
Maintenance
OilType:20W-50engineoil.
Important:Useoilspeciedorequivalent.Other
uidscouldcausesystemdamage.
CheckingtheHydraulicOil
Level
ServiceInterval:Every25hours
Checkexpansionreservoirandifnecessaryadd20W-50
engineoiltotheFULLCOLDline
G010253
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2
3
Figure57
1.Expansionreservoir3.Engine
2.FullColdline
ChangingtheHydraulic
SystemFilterandOil
Thelterandoilarechangedatthesametime.DoNot
reuseoil.Oncethenewlterisinstalledandoilisadded
anyairinthesystemmustbepurged.
Thebleedingprocessisrepeateduntiltheoilremains
attheFULLCOLDlineinthereservoirafterpurging.
Failuretoproperlyperformthisprocedurecan
resultinirreparabledamagetothetransaxledrive
system.
RemovingHydraulicSystemFilters
1.Stopengine,waitforallmovingpartstostop,and
allowenginetocool.Removethekeyandengage
theparkingbrake.
2.Locatethelterandguardsoneachtransaxledrive
system(Figure58).Removethreescrewssecuring
thelterguardandguard.
G010254
1
2
3
4
5
Figure58
Rightsideshown
1.Transaxledrive
4.Screws
2.Oillter
5.Ventplug
3.Filterguard
3.Carefullycleanareaaroundlters.Itisimportant
thatnodirtorcontaminationenterhydraulicsystem.
4.Placeacontainerbelowtheltertocatchtheoilthat
drainswhenthelterandventplugsareremoved.
5.Locateandremovetheventplugoneach
transmission
6.Unscrewtheltertoremoveandallowoiltodrain
fromdrivesystem.
Repeatthisprocedureforbothlters.
InstallingtheHydraulicSystemFilters
ServiceInterval:Aftertherst50hours
Every400hours
45