Toro 31051 - Page 123

TestProcedure(continued)
11.Verifythepumpowunderloadasfollows:
CAUTION
Donotclosethetestervalvefullywhenperformingthistest.Inthis
test,thehydraulictesterispositionedinanunprotectedpartofthe
steeringcircuit.
Pumpdamagecanoccuriftheuidowisfullyrestrictedbyfully
closingthetesterowcontrolvalve.
A.Monitorthetesterpressuregaugecarefullywhileyouslowlyclosethe
owcontrolvalveuntilyouget75bar(1088psi).
B.Recordthetesterpressureandowreadingsunderload.
12.Movethethrottletolowspeed(1,500to1,650rpm)positionandshutoff
theengine.
13.Theunderloadtestowreading(step11B)shouldnotdropmorethan15%
whencomparedtothenoloadtestowreading(step10A).Adifferencein
owofmorethan15%,ortheinabilitytoachievespeciedpressuremay
indicate:
A.Arestrictioninthepumpinletline.
B.Thechargepumpiswornandshouldberepairedorreplaced;referto
ServicingtheGearPump(page5–88).
14.Afteryoucompletethetesting,shutofftheengine,andthenreleasepressure
fromthehydraulicsystem;refertoReleasingPressurefromtheHydraulic
System(page5–5).
15.Disconnectthetester,andconnecttheremovedhydraulictube.
16.Starttheengine,checkforhydraulic-uidleaks,repairanyleaksasrequired,
andllthehydraulictankwiththecorrectquantityofnewhydraulicuid
beforereturningthemachinetoservice.
ProLineH800
Page5–55
HydraulicSystem:TestingtheHydraulicSystem
19241SLRevB