Toro Groundsmaster 7210 Service Manual

TestingtheTractionSystemOperation
BecausethetractionsystemoftheGroundsmaster7210machineuses2
differentcircuits,itisdifculttoidentifywhichcircuitiscausingaproblemand
whathydraulictestsshouldbeperformed.Usethefollowingoperationtestsand
suggestionsbeforeyouperformthehydraulictestsdescribedinthissection.
1.Ifthemachinedoesnottrackinastraightline,lookforaproblemwiththe
componentsthataffecttheweakertractionsideofthemachine.During
operation,themachinewillsteertowardtheweakersideofthetraction
system.Becausetheswashplateofthepistonpumpiscontrolledbythe
tractioncontrollevermovement,if1leverrotatesitsswashplatemorethan
theotherlever,themachinewillnottrackinastraightline.
2.Drivethemachineupamoderateincline,shutofftheengine,place
thetraction-controlleversintheNEUTRALLOCKpositionandallowthe
transmissiontoholdthemachineinplace(theparkingbrakeisnotapplied).
Themachineshouldremainstationaryontheinclineordriftslowlybackwards
inastraightline.If1ofthetractioncircuitsofthetransmissionisdamaged,
themachinewillrollbackwardstowardtheweakertractioncircuit.
3.Thewheelspeedshouldbethesameonthe2rearwheels.Ensurethatthe
hydraulicuidisatnormaloperatingtemperature.Withthemachineraised
offthegroundandcorrectlysupportedwithjackstands,haveanoperator
intheseatmovethetraction-controlleverstothefullforwardspeed.Usea
phototactochecktherotationalspeedofthe2rearwheels.Thewheelspeed
shouldbe190to200rpmforbothrearwheels.
4.Ifanyoftheseoperationtestssuggestatractionsystemproblem,checkthe
followingbeforeyouperformthehydraulictests.
A.Theparkingbrakeisdragging.
B.Thetraction-controlleverisnotadjustedcorrectly.
C.Thetransmissionbypassvalveisnotseated.
D.Checkthehydraulic-uidlevelinthehydraulictanktoensurethatthe
uidleveliscorrect.
Groundsmaster7210
Page4–33
HydraulicSystem:TestingtheHydraulicSystem
16222SLRevC

Toro Groundsmaster 7210 Specifications

General

Horsepower	24.8 hp
Drive System	Hydrostatic
Number of Blades	3
Fuel Capacity	12 gallons
Deck Type	7-Gauge High-Strength Steel
Blade Tip Speed	18, 000+ ft/min
Turning Radius	Zero
Cutting Height	1.0" (2.5 cm) to 5.0" (12.7 cm) in 0.5" (1.3 cm) increments