Toro 74492 - Torque Specifications

TorqueSpecications
Therecommendedfastenertorquevaluesarelistedinthefollowingtables.For
criticalapplications,asdeterminedbyToro,eithertherecommendedtorqueora
torquethatisuniquetotheapplicationisclearlyidentiedandspeciedinthe
servicemanual.
Thesetorquespecicationsfortheinstallationandtighteningoffastenersshall
applyforallfastenerswhichdonothaveaspecicrequirementidentiedin
theservicemanual.Thefollowingfactorsshallbeconsideredwhenapplying
torque:cleanlinessofthefastener,useofathreadsealant(Loctite),degreeof
lubricationonthefastener,presenceofaprevailingtorquefeature,hardness
ofthesurfaceunderneathofthefastener’shead,orsimilarconditionwhich
affectstheinstallation.
Asnotedinthefollowingtables,torquevaluesshouldbereducedby25%for
lubricatedfastenerstoachievethesimilarstressasadryfastener.Torquevalues
mayalsohavetobereducedwhenthefasteneristhreadedintoaluminumor
brass.Thespecictorquevalueshouldbedeterminedbasedonthealuminum
orbrassmaterialstrength,fastenersize,lengthofthreadengagement,etc.
Thestandardmethodofverifyingtorqueshallbeperformedbymarkingalineon
thefastener(headornut)andmatingpart,thenbackofffastener1/4ofaturn.
Measurethetorquerequiredtotightenthefasteneruntilthelinesmatchup.
FastenerIdentication
InchSeriesBoltsandScrews
g272208
Figure1
1.Grade13.Grade8
2.Grade5
2000SeriesZMASTER®ServiceManual
Page2–5
SpecicationsandMaintenance:TorqueSpecications
3438-778RevA