Service Manual

TestingtheCounterbalancePressure
1.Ensurethatthehydraulicuidisatthenormaloperatingtemperatureby
operatingthemachineforapproximately10minutes.
Note:Ensurethatthehydraulictankisfull.
2.Parkthemachineonalevelsurface,lowerthecuttingdecks,shutoffthe
engine,andsettheparkingbrake.
CAUTION
Performingtestingonthehydraulicsystemcancausepersonal
injuryanddamagetotheequipment.
ReadallWarning,Cautions,andprecautionsatthebeginningof
thissection.
g031779
Figure86
1.Counterbalancetestport2.Counterbalancevalve
3.Connecta7,000kPa(1,000psi)pressuregaugetothetestportG1onthelift
controlmanifold(Figure86).
4.Afteryouinstallthepressuregauge,starttheengineandoperateatidle
speed.Checkforthehydraulic-uidleaksandcorrectbeforecontinuing
thetest.
5.Operatetheengineatfullenginespeed(2,750rpm)withnoloadonthe
system.
Note:Donotengagethecuttingdecks.
IMPORTANT
Ensurethatgaugereadingis2,490to2,620kPa(360to380psi).
6.Shutofftheengineandrecordthetestresults.
7.Ifnecessary,adjustthecounterbalancevalvesothatthepressureiscorrect;
refertoAdjustingthePressureValve(page4–94).
Note:Thecounterbalancevalveislocatedontherearsideoftheliftcontrol
manifold;refertoFigure86.
8.Disconnectthepressuregaugefromthetestport.
HydraulicSystem:TestingtheHydraulicSystem
Page4–66
Groundsmaster5900TractionUnit
08159SLRevC