Toro Groundsmaster 4300-D - Page 148

TestProcedure(continued)
8.VerifythepumpowatNoLoadasfollows:
Recordthetesterpressureandowreadingsatnoload.Unrestrictedpump
outputshouldbeapproximately11.9L/minute(3.2gallons/minute).
9.VerifythepumpowUnderLoadasfollows:
CAUTION
Donotclosethetestervalvefullywhenperformingthistest.Inthis
test,thehydraulictesterispositionedbeforethemanifoldrelief
valve.
Pumpdamagecanoccuriftheuidowisfullyrestrictedbyfully
closingthetesterowcontrolvalve.
A.Monitorthetesterpressuregaugecarefullywhileyouslowlyclosethe
owcontrolvalveuntilyouget8,274kPa(1,200psi).
B.Recordthetesterpressureandowreadingsunderload.
10.Presstheenginespeedswitchtolowspeed(1,175to1,225rpm)position
andshutofftheengine.
11.Theunderloadtestowreading(step9B)shouldnotdropmorethan15%
whencomparedtothenoloadtestowreading(step8).Adifferenceinow
ofmorethan15%,ortheinabilitytoachievespeciedpressuremayindicate:
A.Arestrictioninthepumpinletline.
B.Thegearpump(P4)iswornandshouldberepairedorreplaced;referto
ServicingtheGearPump(page4–107)
12.Afteryoucompletethetesting,shutofftheengine,andthenreleasepressure
fromthehydraulicsystem;refertoReleasingPressurefromtheHydraulic
System(page4–6).
13.Removethetester,andconnectthehydraulichosetothegearpump(P4)
outlet.
14.Starttheengine,checkforhydraulic-uidleaks,repairanyleaksasrequired,
andllthehydraulictankwiththecorrectquantityofnewhydraulicuid
beforereturningthemachinetoservice.
15.Installtheoorplate,lowerandsecuretheoperatorseat.
HydraulicSystem:TestingtheHydraulicSystem
Page4–86
Groundsmaster
®
4300-D
16226SLRevC