Toro Groundsmaster 7210 - Page 98

Performthetransmissionpistonpumpowtestifyouidentifyatractioncircuit
problem.Thistestdeterminesifhydraulicowfromatransmissionpistonpump
iscorrect.
TestProcedure
1.Ensurethatthehydraulicuidisatnormaloperatingtemperature.
2.EnsurethatthetractiondriveiscorrectlyadjustedfortheNEUTRALposition.
WARNING
Beforedisconnectingordoinganyworkonthehydraulicsystem,
releaseallthepressureinthesystem;refertoReleasingPressure
fromtheHydraulicSystem(page4–11).
3.Parkthemachineonalevelsurface,lowerthecuttingdeck(orimplement),
andshutofftheengine.
4.ReadallWarning,Cautions,andprecautionslistedatthebeginningofthis
section.
IMPORTANT
Beforeliftingthemachinewithajack,reviewandfollowJacking
Instructions(page1–6).
5.Liftandsupportthemachinewithjackstandssothatthe2rearwheelsareoff
theground.Inthistest,therearwheelsneedtospinfreelytoallowhydraulic
owthroughthetractioncircuit.
Note:Ensurethattheparkingbrakeisnotapplied.
6.Cleanthetransmissionareaaroundthetractioncircuithosesonthetopof
thetransmission(Figure41).Determinewhichpistonpumpistobetested.
7.Disconnectthehydraulichosefromthetransmissionpumpoutletttingto
testthepistonpump(Figure41):
PistonPumptobeTested
PumpOutlet
RightsidepumpPortA
LeftsidepumpPortC
8.Installahydraulictester(pressureandow)inseriesbetweenthepump
outletttinganddisconnectedhose.Ensurethatthetesterowarrowpoints
fromthepumpoutletandtowardthehose.Ensurethattheow-controlvalve
onthetesterisfullyopen.
9.Sitintheoperatorseat,starttheengineandrunitatlow-idlespeed(1,400
rpm).Checkforanyhydraulic-uidleaksfromthetestconnectionsand
correctbeforecontinuingthetest.
IMPORTANT
Donotruntheengineatfullspeedwhenperformingthisowtest
usingTorohydraulictester(pressureandow)(TOR214678).The
tractionpumpoutputatfullenginespeedcandamagethehydraulic
tester.
HydraulicSystem:TestingtheHydraulicSystem
Page4–38
Groundsmaster7210
16222SLRevC