Toro Groundsmaster 4500-D Series - Page 182

ProcedureforEngineCoolingFanCircuitTest
Theenginecoolingfancircuittestshouldbeperformedtomakesurethatthe
enginecoolingfancircuithasthecorrectsystempressureandfanspeed.
CAUTION
Preventpersonalinjuryand/ordamagetoequipment.Readall
WARNINGS,CAUTIONSandPrecautionsforHydraulicTestingatthe
beginningofthissection.
1.Makesurehydraulicoilisatnormaloperatingtemperaturebyoperating
themachineforapproximatelyten(10)minutes.Makesurethehydraulic
reservoirisfull.
2.Parkmachineonalevelsurfacewiththecuttingdecksloweredandoff.Make
sureengineisoffandtheparkingbrakeisapplied.
2
1
3
g308527
Figure89
1.Fancontrolmanifold
3.PRVsolenoid
2.T esttting(portG1)
3.Raiseandsupporthoodtogainaccesstofancontrolmanifold(Figure89).
Connecta345bar(5,000PSI)gaugewithhydraulichoseattachedtotest
ttinginportG1onrearofmanifold.
4.Starttheengineandincreaseenginespeedtohighidlespeed.
5.Whilemonitoringthepressuregaugeandusingaphototactoidentifythe
coolingfanspeed,disconnectthewireharnessconnector(white/violetand
blackwires)fromtheproportionalreliefvalvesolenoidatfancontrolmanifold
(portTS).Bothfanspeedandpressureshouldincreaseandstabilizeafter
thesolenoidisdisconnected.
PRESSUREGAUGEREADINGTOBEapproximately207bar(3000PSI).
PHOTOTAC(fanspeed)READINGTOBEapproximately2800RPM.
6.Stopengineandrecordtestresults.
7.Ifpressurerisestoapproximately207bar(3000PSI)butfanspeedislow,
considerthatthehydraulicfanmotoriswornordamaged.Ifpressureand
fanspeedarebothlow,considerthatnalgearpumpsectioniswornor
damaged(seeGearPumpFlow(UsingTesterwithPressureGauge&Flow
Meter)(page5–82)).
HydraulicSystem:Testing
Page5–80
Groundsmaster
®
4500-D/4700-D
19245SLRevA