Vmac VR70 - Safety Information; Important Safety Notice

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6
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PeriodicMaintenance
Themaintenancescheduleforthesystemisshowninthefollowingtable.Thehoursshownonthetable
arethosedisplayedonthecontrolpanelread‐out.Serviceshouldbeperformedatthelesserofthetwo
intervals,whicheveroccursfirst.Following thisprocedurewillensureoptimumperformanceandlong 
life
fromtheVRsystem.
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Theseserviceintervalsarebasedonnormaloperation.Commonsenseandgoodmaintenancepractices
willindicatewhethertheseproceduresshouldoccurmorefrequently.Forexample,ifthetruckis
continuouslyoperatinginanextremelydustyenvironment,theairfilterandbeltshouldbeinspected
morefrequently.Sincethecompressordraws
inlargequantitiesofairduringoperation,thefiltermay
becomepluggedandwillaffectoperation.
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InspectingtheDriveBelt
Periodicinspectionofthedrivebeltisnecessarytoidentifypotentialproblemsbeforetheycausefailure
ordamage.WhileVMACrecommendsa50hourinterval,iftheoperatingenvironmentissevere,you
shouldinspectthebeltmorefrequently.
Checkthebeltcarefullyforsignsofglazing,missingportionsoftheribs
ordamagetotheedgesor
surface.Ifthereisdamage,itmayindicateaproblemwithpulleyalignmentorimproperusebythe
operator.Installinganewbeltwillnotcorrecttheproblem,itwilljustresultindamagetothenewbelt.
Abeltthatisheat‐damaged
indicatesthatthebeltisslippingonthecompressororcrankshaftpulleys.
Thismaybecausedbyadefective tensionerorbytheoperatorengagingthecompressorwhilethereis
pressureinthesystem.Thiscancausethecompressorclutchtostallandthebeltwillslip.Ifthe
tensioneris
applyingsufficientpressureandismaintainingbelttensioncorrectly,talktotheoperator
andfindouthowtheyareusingthesystem.Inspecttheidlers,pulleysandtensionerfordamage.Any
componentthatshowschips,cracksorotherphysicaldamageshouldbereplaced.
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Ifthebeltisdamagedorworn
alongtheedges,itcouldindicateanalignmentproblem.Ifthisoccurs,
checkthealignmentofallpulleys,idlersandtensionerswithastraightedge.Ifthereisanalignment
problem,checkallsystemfastenerstomakesurethattheyaretight.Alsocheckforcrackingordamage
onthe
mountingbracketandatthecompressor.
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