Toro Groundsmaster 4500-D Series - Page 129

Afoursectiongearpumpiscoupledtothepiston(traction)pump.Thethirdgear
pumpsectionsupplieshydraulicowtoboththeliftcontrolmanifoldandthe
steeringcontrolvalve.Hydraulicowfromthispumpsectionisdeliveredtothe
circuitsthroughaproportionalowdividerlocatedinthefancontrolmanifold.
Maximumlift/lowercircuitpressureislimitedto110bar(1600PSI)byarelief
valve(RV)intheliftcontrolmanifold.Liftcircuitpressurecanbemonitoredat
testttingG1ontheliftcontrolmanifold.
OntheGroundsmaster4500-D,asingleliftswitchontheconsolearmisusedto
raiseandlowertheve(5)cuttingdecks(Figure44).
Whenthecuttingdecksareinastationaryposition(notraisingorlowering),lift
circuitowfromthethirdgearpumpsectionbypassestheliftcylindersthrough
theliftcontrolmanifoldsolenoidvalveS5andproportionalreliefvalveTSwhich
arede-energized.Returnowfromthemanifoldisroutedtotheoillterand
tractionchargecircuit.
Note:Theoperatormustbeintheoperatorseatinordertoraisethecutting
decks.
g308047
Figure44
1.Consolearm2.Liftswitch
#4 #1 #5
#3#2
g308048
Figure45
GM4500-DCuttingDeckLocations
Groundsmaster
®
4500-D/4700-D
Page5–27
HydraulicSystem:HydraulicFlowDiagrams
19245SLRevA