Toro 74480 - Bleeding the Hydraulic System

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Figure70
BleedingtheHydraulic
System
1.Raisetherearofmachineandsupportitwith
jackstands(orequivalentsupport)justhigh
enoughtoallowthedrivewheelstoturnfreely.
g017625
Figure71
1.Jackingpoints
2.Starttheengine,movethethrottlecontrolahead
tothe1/2throttleposition,anddisengagethe
parkingbrake.
A.Movethebypassleversintothepushingthe
machineposition.Withthebypassvalves
openandtheenginerunning,slowlymove
themotion-controlleversinbothforward
andreverse5or6times.
B.Movethebypassleversintotheoperating
themachineposition.
C.Withthebypassvalveclosedandthe
enginerunning,slowlymovethecontrol
leverinbothforwardandreversedirections
5to6times.
D.Shutofftheengineandchecktheuid
levelintheexpansionreservoir.Addthe
specieduiduntilitreachestheFULLCOLD
lineontheexpansionreservoir.
3.Repeatstep2untilalltheairiscompletely
purgedfromthesystem.
Note:Whenthetransaxleoperatesatnormal
noiselevels,movessmoothlyforward,and
reversesatnormalspeeds,itispurged.
4.Checktheuidlevelintheexpansionreservoir
analtime.Addthespecieduidasuntilit
reachestheFULLCOLDlineontheexpansion
reservoir.
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