ForwardDirection(continued)
Theforwardtractionpressureislimitedto280bar(4,061psi).Theuidowing
fromthemotorreturnstothevariabledisplacementpumpandiscontinuously
pumpedthroughtheclosedloopcircuitaslongasthetractionpedalispressed.
Thepistonpumpisequippedwithacasedraintoallownormalinternalleakage
toberemoved.
Thehydraulicpumpalsoincludesagerotorchargepump.Thechargepump
providesaconstantsupplyofpressurizeduidtotheclosedlooptractioncircuit
forlubricationandtomakeupforuidthatislostduetointernalleakageinthe
system.Thechargepumpisfedthroughalterfromthehydraulictank.The
chargepumpowisdirectedtothelowpressuresideoftheclosedlooptraction
circuit.Thechargepressureislimitedto7bar(101psi)byadedicatedpressure
reliefvalveinthehydraulicpump.
HydraulicSystem:HydraulicFlowDiagrams
Page5–16
ProLineH800
19241SLRevB
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