Toro 08743 - Page 112

TestProcedure(continued)
correctowdirection(awayfromthepump)andthetesterowcontrolvalve
isfullyopen.
6.Starttheengineandrunitatlow-idlespeed.Correctanyhydraulicuidleaks
atthetestconnectionsbeforecontinuingthetest.
7.Setthethrottletothefullspeed(3,400to3,500RPM).Verifytheengine
RPMatthedrivehubsorrubbercouplingwithanon-contacttachometer
(phototach).
8.Makesurehydraulicuidisatnormaloperatingtemperaturebyoperatingthe
machineforapproximately10minutes.
9.VerifythepumpowatNoLoadasfollows:
A.Unrestrictedpumpoutputshouldbeapproximately19LPM(5GPM).
B.Recordthetesterpressureandowreadingsatnoload.
10.VerifythepumpowUnderLoadasfollows:
CAUTION
Donotclosetestervalvefullywhenperformingthistest.Inthis
test,thehydraulictesterispositionedbeforethecircuitreliefvalve.
Pumpdamagecanoccuriftheuidowiscompletelyrestrictedby
fullyclosingthetesterowcontrolvalve.
A.Monitorthetesterpressuregaugecarefullywhileslowlyclosingtheow
controlvalveuntil5,516kPa(800psi)isobtainedonthetesterpressure
gauge.
B.Recordthetesterpressureandowreadingsunderload.
C.Openthetesterowcontrolvalvefully.
11.Verifythecircuitreliefvalveoperationasfollows:
CAUTION
Whenperformingthetest,donotallowthetesterpressureto
exceed8300kPa(1400PSI).
IMPORTANT
Holdtheliftleverinthefullyraisedpositionorholdthesteering
wheelatthefullylockedpositiononlylongenoughtoobtaina
systempressurereading.
A.Openthecircuitreliefvalveviatheliftsystem.Watchthepressuregauge
onthetesterandmovetheliftlevertotheRAISEposition.Momentarily
holdtheleverwiththehitchfullyraisedcausingthecircuitreliefvalveto
open.Recordthepressureatwhichthereliefvalveopens.
B.Onmodel08745machines,openthecircuitreliefvalveviathesteering
system.Watchthepressuregaugeonthetesterandturnthesteering
wheelcompletelyinonedirection.Thecircuitreliefvalveshouldopenjust
afterthefrontwheelgetstothefulllockposition.Recordthepressureat
whichthereliefvalveopens.
HydraulicSystem:TestingtheHydraulicSystem
Page5–42
SandPro
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3040and5040
20251SLRevA