320C Hyd TA.docx
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320C Hyd TA.docx
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320CHydTA
Contents
RequiredTools
EnginePerformanceTest(Speed)
PressureSpecifications
TemporarySettingOfTheMainReliefValve
Air(MainHydraulicPump)-Purge
CylinderDrift(EmptyBucket)
CylinderDrift(LoadedBucket)
CylinderOperatingSpeed
SwingSpeedandOverswingonLevelGround
SwingSpeedandSwingDriftonaSlope
TravelTestonLevelGround
TravelTestonLevelGround(OptionalTest)
MachineDriftonaSlope
CaseDrainTest
PumpControl(NegativeFlow)-Adjust
PumpControl(OutputFlow)-Adjust
PistonPump(Main)-Test(ConstantHorsepowerFlowControl)
RequiredTools
EnginePerformanceTest(Speed)
1.Positionthemachineonlevelground.
2.Stoptheengine.
3.Install9U-7400MultitachToolGroupontheengine.
4.Starttheengine.
5.Increasethehydraulicoiltemperatureto55°C±5°C(131°F±9°F).
6.Readtheenginespeeddisplay(rpm)onthemultitach.RefertoTable4forthespecificationsforenginespeedatthedesiredengineoperation.
Note:
ANewspecificationistheperformancethatcanbeexpectedforanewmachine.ARebuildspecificationistheperformancethatcanbeexpectedafterrebuildingthecomponentsofasystem.PerformancebeyondtheServiceLimitisanindicationoftheseproblems:
impropermaintenanceoradjustment,componentwearandfailure.
PressureSpecifications
Note:
ANewspecificationistheperformancethatcanbeexpectedforanewmachine.ARebuildspecificationistheperformancethatcanbeexpectedafterrebuildingthecomponentsofasystem.PerformancebeyondServiceLimitspecificationsisanindicationoftheseproblems:
improperadjustment,wear,damageofreliefvalvesanddamageofpumps.
Note:
PressurevaluesinTable26areapproximatevalues.Useapressuregaugeforadjustment.
Note:
Normaloperationsoftheengineandpumpsarenecessaryforthepressureadjustments.Iftheresultsofthepressureadjustmentarenotcorrect,thentheengineandthepumpcharacteristiccurveneedstobechecked.Slowoutputflowfromthepumpisanindicationofairinthehydraulicsystem.Makesurethatnoairispresentinthehydraulicsystem.RefertoTestingAndAdjusting,"Air(MainHydraulicPump)-Purge".
TemporarySettingOfTheMainReliefValve
Note:
Atemporarysettingofthemainreliefvalveisrequiredbeforeanylinereliefvalvecanbeadjusted.
1.Positionthemachineonlevelground.
2.Stoptheengine.
3.Releasethepressureinthehydraulicsystem.RefertoTestingAndAdjusting,"HydraulicSystemPressure-Release".
4.Connecta60000kPa(8700psi)pressuregaugetopressuretap
(1).Connecta60000kPa(8700psi)pressuregaugetopressuretap
(2).
5.Connecta6000kPa(870psi)pressuregaugetopressuretap(3).
6.Starttheengine.
7.Placethemachinecontrolsatthefollowingsettings:
enginespeeddial"10"andAECswitchOFF.RefertoTestingAndAdjusting,"EnginePerformanceTest"forenginerpmsettings.
8.Increasethehydraulicoiltemperatureto55°±5°C(131°±9°F).
9.SlowlymovethejoystickforthebuckettotheBUCKETOPENposition(bucketcylinderrodatthefullyretractedposition).
10.Checkthemainreliefvalvepressuresettingatpressuretap
(1).
11.ReturnthejoystickforthebuckettotheNEUTRALposition.
12.Themainreliefvalvepressuresettingshouldbe34300±490kPa(4950±72psi).Ifthemainreliefvalveisnotwithinthespecification,adjustthemainreliefvalvepressuresettingtothecorrectpressurespecificationbeforeperformingStep13.RefertoTestingandAdjusting,"MainReliefValve-TestandAdjust".
13.Loosenlocknut(5)andturnadjustmentscrew(4)clockwiseforonehalfturn.Tightenlocknut(5)tothespecifiedtorque.
Note:
Alwaysmakefinalpressureadjustmentsonpressurerise.
Air(MainHydraulicPump)-Purge
Whenthemainpumpshavebeenservicedorthehydraulicoilhasbeenreplaced,removetheairfromthehydraulicsystem.Removetheairfromthehydraulicsysteminthefollowingmanner:
1.Whiletheengineisstopped,disconnecthose(3)fromconnector
(1).
2.Removeconnector
(1)andO-Ringseal
(2)fromthepumphousing.
3.Fillthemainpumpswithoil.
4.InspectO-Ringseal
(2).Ifthesealisdamaged,replacetheseal.
5.InstallO-Ringseal
(2)andconnector
(1)atthepumphousing.
6.Connecthose(3)toconnector
(1).Tightenhose(3)tothespecifiedtorque.
7.Starttheengine.
8.Placetheengineatlowidleposition.Raisetheboomandholdtheboominthisposition.
9.Slowlyloosenhose(4)untiloilbeginstoflowaroundthehoseconnection.
10.Tightenhose(4)tothespecifiedtorque.
11.Stoptheengineandslowlylowertheboomuntilthebucketisontheground.Thispressurizesthehydraulictank.
12.Slowlyloosenventplug(5)untiloilbeginstoflowfromtheopening.
13.Tightentheventplugtothespecifiedtorque.
CylinderDrift(EmptyBucket)
Note:
Theenginespeedand/orthemachineconfigurationthatisusedduringthistestcanaffecttheresultsofthistest.RefertoTestingandAdjusting,"EnginePerformanceTest"fortheenginespeedthatwasusedforthistest.RefertoTestingandAdjusting,"OperationalChecks"forthemachineconfigurationsthatwereusedforthistest.
Note:
Thereliefvalvepressuresettingsmustbesettothereliefvalvepressurespecificationbeforeperformingthisoperationalcheck.RefertoTestingandAdjusting,"PressureSpecifications".
1.Positionthemachineonlevelground.RefertoIllustration
2.Emptythebucket.
3.Raisetheboomuntilthetopstickpinisthesameheightastheboomfootpin.
4.Fullyextendthebucketcylinder.
5.Fullyretractthestickcylinder.
6.Extendthestickcylinderrod70mm(2.8inch)fromthefullyretractedposition.
7.Measureeachcylinder'slengthfromcylinderpintocylinderpin.
8.Stoptheengine.
9.Leavethemachineinthispositionforfiveminutes.Measureeachcylinder'slengthfromcylinderpintocylinderpinfordrift.
CylinderDrift(LoadedBucket)
Note:
Theenginespeedand/orthemachineconfigurationthatisusedduringthistestcanaffecttheresultsofthistest.RefertoTestingandAdjusting,"EnginePerformanceTest"fortheenginespeedthatwasusedforthistest.RefertoTestingandAdjusting,"OperationalChecks"forthemachineconfigurationsthatwereusedforthistest.
Note:
Thereliefvalvepressuresettingsmustbesettothereliefvalvepressurespecificationbeforeperformingthisoperationalcheck.RefertoTestingandAdjusting,"PressureSpecifications".
1.Positionthemachineonlevelground.RefertoIllustration16.
2.Loadthebucket.
Weightofbucketload
320C...1050kg(2310lb)320CL...1200kg(2650lb)
3.Raisetheboomuntilthetopstickpinisthesameheightastheboomfootpin.
4.Fullyextendthebucketcylinder.
5.Fullyretractthestickcylinder.
6.Extendthestickcylinderrod70mm(2.8inch)fromthefullyretractedposition.
7.Measureeachcylinder'slengthfromcylinderpintocylinderpin.
8.Stoptheengine.
9.Leavethemachineinthispositionforthreeminutes.Measureeachcylinder'slengthfromcylinderpintocylinderpinfordrift.
CylinderOperatingSpeed
Note:
Theenginespeedand/orthemachineconfigurationthatisusedduringthistestcanaffecttheresultsofthistest.RefertoTestingandAdjusting,"EnginePerformanceTest"fortheenginespeedthatwasusedforthistest.RefertoTestingandAdjusting,"OperationalChecks"forthemachineconfigurationsthatwereusedforthistest.
Note:
Thereliefvalvepressuresettingsmustbesettothereliefvalvepressurespecificationbeforeperformingthisoperationalcheck.RefertoTestingandAdjusting,"PressureSpecifications".
1.Performthefollowingstepsinordertotesttheoperatingspeedoftheboomcylinders.
(A)Extensiontest(B)Retractiontest
a.Placethemachineonlevelground.
b.Thebucketshouldbeempty.
c.Fullyretractthebucketcylinderandthestickcylinder.
d.Positionthebucketontheground.Withastopwatch,measurethetimethatisrequiredtofullyextendtheboomcylinders.
e.Positiontheboomcylindersatfullextension.Withastopwatch,measurethetimethatisrequiredforthebuckettocomeincontactwiththeground.
f.RefertothespecificationsinTable23fortheoperatingspeedoftheboomcylinders.
2.Performthefollowingstepsinordertotesttheoperatingspeedofthestickcylinder.
(A)Extensiontest(B)Retractiontest
a.Placethemachineonlevelground.
b.Thebucketshouldbeempty.
c.Positiontheuppersurfaceoftheboomparalleltotheground.
d.Fullyextendthebucketcylinder.
e.Retractthestickcylinder.Withastopwatch,measurethetimethatisrequiredtofullyextendthestickcylinder.
f.Extendthestickcylinder.Withastopwatch,measurethetimethatisrequiredtofullyretractthestickcylinder.
g.RefertothespecificationsinTable23fortheoperatingspeedofthestickcylinder.
3.Performthefollowingstepsinordertotesttheoperatingspeedofthebucketcylinder.
(A)Extensiontest(B)Retractiontest
a.Placethemachineonlevelground.
b.Thebucketshouldbeempty.
c.Positiontheuppersurfaceoftheboomparalleltotheground.
d.Positionthesticksothatthestickisperpendiculartotheground.
e.Fullyretractthebucketcylinder.
f.Withastopwatch,measurethetimethatisrequiredtofullyextendthebucketcylinder.
g.Positionthebucketcylinderatfullextension.Withastopwatch,measurethetimethatisrequiredtofullyretractthebucketcylinder.
h.RefertothespecificationsinTable23fortheoperatingspeedofthebucketcylinder.
SwingSpe
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