Case 921G - Basic Instructions - How to Use the Maintenance Standard and Precautions

INTRODUCTION
Basicinstructions-Howtousethemaintenancestandardand
precautions
Application
WHENTHEMACHINEISNEW
Conrmthattheperformancesareinaccordancewithstandardspecicationsascomparedtotheperformancestan-
dards.
ATSPECIFICSELFINSPECTION(RULEBYCOUNTRY)
Usethedataforthecriterion,forthepurposeofcorrection,adjustmentandreplacement.
WHENPERFORMANCESAREDETERIORATED
Determinewhetheritiscausedbyafaultorendofservicelifeafterlonghoursofoperation,tobeusedforsafetyand
economicalconsiderations.
WHENMAINCOMPONENTSAREREPLACED
Forexample,usedatatorestoreperformancesofpumpsandothers.
Terminology
STANDARDVALUES
Valuestobeusedtoconditionorassembleanewmachine.Wherespecialnotesarenotgiven,thesevaluesrepresent
standardspecications(machinewithstandardattachmentsandstandardtires).
REFERENCEVALUESFORREMEDY
Valuesatwhichreadjustmentisrequired.Inordertoensureperformanceandsafetyitisstrictlyprohibitedtousethe
machineoverthespeciedvalues.
SERVICELIMIT
Thisisthelimitvalueatwhichreconditioningisimpossiblewithoutreplacementofparts.Ifthevalueisexpected
toexceedtheservicelimitbeforenextinspectionandcorrectionareperformed,replacethepartsimmediately.The
operationoverthespeciedvaluescausesincreaseofdamageandrequiresthedowntimeofmachine,andalso
causessafetyproblems.
Cautionstobeexercisedatjudgment
EVALUATIONOFMEASUREDDATA
Disagreementofmeasuringconditions,variationsofdatapeculiartoanewmachine,andmeasuringerrorsaretobe
evaluated.Determinegenerallyatwhatlevelsmeasuredvaluesarelocated,insteadofdeterminingwhetherornot
valuesfallwithinorrunoutofthereferencevalues.
DETERMININGCORRECTION,ADJUSTMENTORREPLACEMENT
Machineperformancesdeterioratewithtimeaspartswearandsomedeterioratedperformancesmayberestoredto
newlevels.Therefore,determinecorrection,adjustmentorreplacement,dependingupontheoperatinghours,kindof
workandcircumstancesinwhichthemachineisplaced,andconditionthemachineperformancestoitsmostdesirable
levels.
Othercautionstobeexercised
PARTSLIABLETODEGRADE
Rubberproducts,suchas,hydraulichoses,O-rings,andoilsealsdeterioratewithtime;replacethematregularinter-
valsoratoverhauls.
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