CalculatingtheTorqueValuesWhenUsingaDrive-AdapterWrench
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Figure4
1.Drive-adapterwrench3.Torquewrench
2.Effectivelengthoftorquewrench4.Effectivelengthoftorquewrench+drive-adapterwrench
Usingadrive-adapterwrench(e.g.,crowfootwrench)inanypositionotherthan
90°and270°totheframeofthetorquewrenchwillaffectthetorquevalue
measuredbythetorquewrenchbecauseoftheeffectivelength(lever)ofthe
torquewrenchchanges.Whenusingatorquewrenchwithadrive-adapter
wrench,multiplythelistedtorquerecommendationbythecalculatedtorque
conversionfactor(Figure4)todeterminepropertighteningtorque.Whenusinga
torquewrenchwithadrive-adapterwrench,thecalculatedtorquewillbelower
thanthelistedtorquerecommendation.
Example:Themeasuredeffectivelengthofthetorquewrench(distancefrom
thecenterofthehandletothecenterofthesquaredrive)is457mm(18inches).
Themeasuredeffectivelengthofthetorquewrenchwiththedrive-adapter
wrenchinstalled(distancefromthecenterofthehandletothecenterofthe
drive-adapterwrench)is483mm(19inches).
Thecalculatedtorqueconversionfactorforthistorquewrenchwiththis
drive-adapterwrenchwouldbe18/19=0.947.
Ifthelistedtorquerecommendationforafasteneris103to127N∙m(76to94
ft-lb),thepropertorquewhenusingthistorquewrenchwithadrive-adapter
wrenchwouldbe98to121N∙m(72to89ft-lb).
Groundsmaster
®
3280-D/3320
Page2–7
Speciîš¿cationsandMaintenance:TorqueSpeciîš¿cations
05138SLRevB
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