ImplementReliefPressureTest(UsingPressureGauge)(Machine
SerialNumbersbelow316000000)(continued)
Note:Iftheimplementreliefpressureis4,820to6,900kPa(700to1,000
psi)andasteeringorliftproblemoccurs,inspectforaproblemunrelatedto
thehydrauliccircuit(e.g.,bindingsteeringorliftsystemcomponents,debris
build-upon/underthecuttingdeck).Checkandrepairotheritemsbefore
continuingwithhydraulictests.
4.Iftheimplementreliefpressureisbelow4,820kPa(700psi),adjustthe
implementreliefvalveinthetransmissionbyaddingtherequiredamount
ofshimsfromtheshimpack;refertoImplementReliefValveinthe
Sauer-Danfoss(Sundstrand)15SeriesServiceManualattheendofthis
chapter.
Note:Forevery0.254mm(0.010inch)ofshimthickness,thereisan
approximate340kPa(50psi)changeinimplementreliefpressure.
Ifaddingshimstothereliefvalvedoesnotincreasepressure,inspectthe
conditionofthechargepumpgerotorandinternalhousing;refertoCharge
PumpServiceintheSauer-Danfoss(Sundstrand)15SeriesServiceManual
attheendofthischapter.
Ifthechargepumpisingoodcondition(noscoring,scratches,orexcessive
wear),thegeneralconditionofthetransmission’spistonpumpandpiston
motormightbesuspectedofwearandinefîš¿ciency.Alackofminimum
implementreliefpressurecouldbeduetothechargepumphavingtodirect
allowtothemaintractioncircuit(pistonpumpandpistonmotor).
5.Disconnectpressuregaugefromthetransmission.Installpipeplugbackin
thetransmission.Checkhydraulic-uidlevelinreservoir(frontaxle).
HydraulicSystem:TestingtheHydraulicSystem
Page5–52
Groundsmaster
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3280-D/3320
05138SLRevB
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