Toro 74920 - Hydraulic System Bleeding Procedure; Bleeding the Hydraulic System

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Figure59
1.Applyathincoatofoilonthesurfaceoftherubber
sealofeachlter.
2.Turnthelterclockwiseuntilrubbersealcontacts
thelteradapterthentightenthelteranadditional
3/4to1fullturn.Repeatfortheotherlter
3.Installthelterguardsovereachlteraspreviously
removed.Usethethreescrewstosecurethelter
guards.
4.Verifytheventplugsareremovedbeforeaddingthe
oil.
5.Slowlypourthespeciedoilthroughexpansion
reservoiruntiloilcomesoutofoneoftheventplug
holes.Stopandinstallthatventplug.Torquethe
plugto180in-lb(20.3N-m).
6.Continuetoaddoilthroughtheexpansionreservoir
untiloilcomesoutoftheremainingventplughole
onthesecondtransmission.Stopandinstallthat
ventplug.Torquetheplugto180in-lb(20.3N-m).
7.Continuetoaddoilthroughtheexpansionreservoir
untilitreachestheFULLCOLDlineonthe
expansionreservoir.ProceedtotheBleedingthe
HydraulicSystemsection.
Important:Failuretoperformthe
Bleeding
the Hy draulic System procedureafterchanging
hydraulicltersandoilcanresultinirreparable
damagetothetransaxledrivesystem.
BleedingtheHydraulicSystem
1.Raisetherearofmachineupandsupportwithjack
stands(orequivalentsupport)justhighenoughto
allowdrivewheelstoturnfreely.
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Figure60
1.Jackingpoints
2.Entertheoperator'sposition.Startengineand
movethrottlecontrolaheadto1/2throttleposition.
Disengageparkingbrake.
A.Movethebypassleversintothepushingthe
machineposition;refertothePushingthe
MachinebyHandsectioninOperation.With
thebypassvalvesopenandtheenginerunning,
slowlymovethemotioncontrolleversinboth
forwardandreverse(5or6times).
B.Movethebypassleversintotheoperating
themachineposition.Withthebypassvalve
closedandtheenginerunning,slowlymovethe
directionalcontrolinbothforwardandreverse
directions(5to6times).
C.Stoptheengineandchecktheoillevelinthe
expansionreservoir.Addthespeciedoilas
untilitreachestheFULLCOLDlineonthe
expansionreservoir.
3.Repeatstep2untilalltheairiscompletelypurged
fromthesystem.
Whenthetransaxleoperatesatnormalnoiselevels
andmovessmoothlyforwardandreverseatnormal
speeds,thenthetransaxleisconsideredpurged.
4.Checktheoillevelintheexpansionreservoirone
lasttime.Addthespeciedoilasuntilitreaches
theFULLCOLDlineontheexpansionreservoir
ifnecessary.
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