Service Manual

ProcedureforTractionCircuitChargePressureTest(continued)
Note:Ifthegearpumpsectionthatsuppliesthechargecircuitiswornor
damaged,charge,steering,lift/lowerandenginecoolingfancircuitsmayall
beaffected.
7.Next,withthepressuregaugestillconnectedtothechargepressuretestport,
takeagaugereadingwhileoperatingthemachineinforwardandreverse.
Starttheengineandputthrottleathighidlespeed.Applythebrakesand
pushthetractionpedalforwardwhilemonitoringthepressuregauge.Repeat
forreversedirection.Stopengineandrecordtestresults.
8.Ifchargepressuremeetsspecicationsundernoloadconditions(step5
above),butconsistentlydropsmorethan15%whenundertractionload,
thepiston(traction)pumpand/ortractionmotor(s)shouldbesuspectedof
wearandinefciency.Whenthepumpormotorsarewornordamaged,
thechargepumpisnotabletokeepupwithinternalleakageinthetraction
systemcomponents.
9.Whentestingiscompleted,disconnectpressuregaugefromtesttting.
Securedustcaptotesttting.
10.Lowerandsecureoperatorseat.
Groundsmaster
®
4000-D&4010-D
Page5–41
HydraulicSystem:Testing
13202SLRevE