Allison Transmission 4700

•Drippingoilfromthetransmissionoroutputsealarea.
•Debristhatisblockingthebreatherlocatedontopofthetorque
converterhousing.
•Looseboltssecuringtransmissiontoengineorvehiclecomponents
attachedtothetransmission.
•Looseengineandtransmissionmounts.
•Harnessesinterfacingwithtransmissioncontrolsandvehiclefunction
arestillingoodcondition.
Reportanyabnormalconditiontoservicemanagement.Immediatelycorrect
anyproblemsfoundduringthisinspectiontopreventfurthervehicleand/or
transmissiondamage.
5.2PREVENTMAJORPROBLEMS
Youcanhelpkeepminorproblemsfrombecomingmajorproblemsby
contactinganAllisonTransmissiondistributorordealerwhenoneofthese
conditionsoccur:
•Ashiftqualityissue
•Adriveabilityissuesuchasavibration
•Transmission,hydrauliclineorttingisleakinguid
NOTE:Dampnessaroundthebreatherandoutputsealisnormal.If
thereisadripassociatedwiththedampnessatthebreather,output
seal,orelsewhereonthetransmissionthenrepairthecauseofthe
leak.
•CHECKTRANSlightilluminates
5.3IMPORTANCEOFTRANSMISSIONFLUIDS
Propertransmissionuidselectionisimportanttotransmissionperformance,
reliability,anddurability.Theuidusedinthetransmissiondoesthefollowing:
•Providestheworkingmediumforthetorqueconverter,controls,and
clutchapplication
•Transfersheatfromthetransmissiontothecooler
•Lubricatesgearsandbearings
•Carriesrustinhibitingchemicalsthroughoutthetransmission
•Achievesoptimumcoefcientoffrictionfortheclutchapplication
•Maintainsclutchengagement
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