Toro 74855 - Bleeding the Hydraulic System

InstallingtheHydraulicSystemFilters
ServiceInterval:Aftertherst50hours
Every400hours
1.Applyathincoatofoilonthesurfaceoftherubber
sealofeachlter(
Figure48).
2.Turnthelterclockwiseuntilrubbersealcontactsthe
lteradapterthentightenthelteranadditional3/4
to1fullturn(Figure48).
3.Repeatstep2fortheotherlter.
4.Alignthelterguardsovereachlter;refertostep4of
RemovingHydraulicSystemFilters(page37).
5.Securethelterguardswiththe3screwsremovedin
step4ofRemovingHydraulicSystemFilters(page
37)Usethethreescrewstosecurethelterguards.
6.Addoiltothehydraulicsystemasfollows:
A.Ensurethattheventplugsandreservoircapare
removedbeforeaddingtheoil(Figure46and
Figure47).
B.Slowlypourthespeciedoilthroughexpansion
reservoiruntiloilcomesoutofoneofthevent
plugholesandstoplling(Figure47).
C.Installthatventplug(Figure47).
Note:Torquetheplugto20.3N-m(180in-lb).
D.Addoilthroughtheexpansionreservoiruntiloil
comesoutoftheremainingventplugholeonthe
secondtransmissionandstoplling(Figure47).
E.Installthatventplug(Figure47).
Note:Torquetheplugto20.3N-m(180in-lb).
7.Addoilthroughtheexpansionreservoiruntilitreaches
theFULLCOLDlineontheexpansionreservoirand
installthecapforthereservoir(Figure46).
8.Bleedthehydraulicsystem;refertoBleedingthe
HydraulicSystem(page38).
Important:Failuretoperformthe Bleeding
the Hy draulic System procedureafterchanging
hydraulicltersandoilmayresultinirreparable
damagetothetransaxledrivesystem.
BleedingtheHydraulicSystem
1.Raisetherearofmachineupandsupportwithjack
stands(orequivalentsupport)justhighenoughto
allowdrivewheelstoturnfreely.
G010333
1
Figure49
1.Jackingpoints
2.Gototheoperator'sposition.
3.Startengineandmovethrottlecontrolaheadto1/2
throttleposition.
4.Disengageparkingbrake.
5.Cyclethehydraulicsystembyperformingthefollowing:
A.Movethebypassleversrearwardandthendown
tolocktheminplace(valveopenposition);refer
toToPushtheMachine(page24).
B.Withthebypassvalvesopenandtheengine
running,slowlymovethemotioncontrolleversin
bothforwardandreverse(5or6times).
C.Movethebypassleversuptounlockthemand
forward(valveclosedposition);refertoToPush
theMachine(page24).
D.Withthebypassvalveclosedandtheengine
running,slowlymovethedirectionalcontrolin
bothforwardandreversedirections(5to6times).
6.Stoptheengineandchecktheoillevelintheexpansion
reservoir.Addthespeciedoilasuntilitreachesthe
FULLCOLDlineontheexpansionreservoir(Figure
46).
7.Repeatstep5untilalltheairiscompletelypurgedfrom
thesystem.
Note:Whenthetransaxleoperatesatnormalnoise
levelsandmovessmoothlyforwardandreverseat
normalspeeds,thenthetransaxleisconsideredpurged.
8.Checktheoillevelintheexpansionreservoironelast
time.AddthespeciedoilasuntilitreachestheFULL
COLDlineontheexpansionreservoirifnecessary
(
Figure46).
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