Toro Groundsmaster 4300-D - Page 83

PTOEngaged(continued)
createsapressureincreaseatthelogiccartridgethatshiftsthelogiccartridge
andallowsuidreturnfromthedeckmotors.
Themaximummowcircuitpressureislimitedateachdeckmanifoldcircuitbythe
proportionalreliefvalve(PRV1/PRV2).Thedeckreliefvalvepressureis17,500
kPa(2,500psi)fortherearcuttingunitcircuitand24,100kPa(3,500psi)forthe
frontcuttingunitcircuit.MowcircuitpressurecanbemeasuredatportG1(rear
cuttingunitcircuit)orG3(frontcuttingunitcircuit)ofthedeckcontrolmanifold.
Thebrakereliefandlogiccartridgescontrolthestoppingrateofthebladeswhen
theproportionalreliefvalvesarede-energizedasthePTOswitchisturnedOFF
orifthedecksareraised;refertoMowCircuitCuttingDeckBladeBraking
(page4–22).
Groundsmaster
®
4300-D
Page4–21
HydraulicSystem:HydraulicFlowDiagrams
16226SLRevC