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AT07 transmission oil pump.pdf

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AT07 TRANSMISSION OIL PUMP
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Automatic Transmissions - Course 262 81 1. Demonstrate the measurement of the oil pump gears to determine the serviceability of the oil pump. 2. Demonstrate the measurement of oil pump bushings to determine the serviceability of the oil pump. 3. Describe the operation of the gear type oil pump. Section 7 TRANSMISSION OIL PUMP Lesson Objectives:Section 7 82 TOYOTA Technical Training ThepumpusedinToyotaautomatictransmissionsisthecrescenttype. Itisdesignedto: w Providefluidtolubricatetheplanetarygearset. w Providecontinuousfluidtothetorqueconverter. w Provideavolumeoffluidtotheclutchesandbrakes. w Supplyoperatingpressuretothehydrauliccontrolsystem. w Providesupportforthetorqueconverterstator(statorreaction shaft)aswellasthefrontofplanetarygearset. Purpose of the Oil PumpTRANSMISION OIL PUMP Automatic Transmissions - Course 262 83 Theoilpumpisdrivenbythetorqueconverter.Thecenterdrivegearis drivenbythetorqueconverterdrivehub.Theexternalteethofthe drivegearmeshwiththeinternalteethofthedrivengear,causingitto rotateinthesamedirection.Locatedbetweenthetwogearsisthe crescent,whichseparatestheinletofthepumpfromtheoutlet.Asthe gearsrotateinaclockwisedirection,alowpressuredevelopsonthe inletsideofthepumpasthegearteethmoveawayfromeachother.On theotherendofthecrescent,thegearteethcometogetherforcingthe fluidthroughtheoutlet. Oil Pump Thepumpthereforecontrolsthevolumeoffluidbeingdelivered. Pressureisdeterminedbytheamountofleakageandcontrolleddrains ontheoutletcircuitsandenginespeed.Thepressureregulatorvalvein thevalvebodycontrolspressurebyallowingforleakagebasedon vehiclespeedandengineload.Maximumpressureisregulatedbythe pressurereliefvalvethatallowsforleakagewhentheoilpressure overcomesthetensionofacalibratedspring.Moredetailaboutthese valveswillbediscussedinthesectiononthevalvebody. Theoilpumpcanbecheckedintwoways:bymeansofapressure gaugesetwhilethetransmissionisstillinthevehicleormechanically bytheuseoffeelergaugeswhenthepumphasbeenremovedand disassembled. Oil Pump OperationSection 7 84 TOYOTA Technical Training Placeastraightedgeacrossthepumphousinganddriveanddriven gear.Measuretheclearancebetweenthestraightedgeandeachgear usingafeelergauge.Iftheclearanceisgreaterthanthemaximum,the gearsshouldbereplaced. Pump Gear Height Checkpumpbodyclearancebypushingthedrivengeartoonesideand measuringtheclearancebetweenthegearandthepumpbodyonthe oppositeside.Thenmeasurethedrivengeartocrescentclearance.If theclearancesexceedthemaximumspecification,replacethepump subassembly. Pump Gear Clearance Ifthegearsareremovedfromthepumphousing,makesurethatyou markthegearswithmachinistblue.Theimportancehereisthatboth gearsfaceupwhenreinstalledbecausethegearteethhaveworn-in.It isnotimportantthatthesameteetharematched.Donotscratchthe gearstomarkthemasthismaydamagethehousingwhenthepumpis assembled. Gear Height Measurement Gear Clearance Measurement CAUTIONTRANSMISION OIL PUMP Automatic Transmissions - Course 262 85 Theoilpumpbushingsupportsthetorqueconverterdrivehub.Ifthe bushingiswornexcessively,thefronttransmissionsealmaywear prematurely.Tomeasurethediameter,firstremovetheoilsealand thenusingasnapgaugeorothermeasuringdevice,measuretheinside diameterofthebushinginthreepositions.Ifthelargestdiameteris greaterthanthespecification,replacetheoilpumpbody. Pump Bushing Diameter Thestatorshaftbushingssupporttheinputshaftofthetransmission. Measuretheinsidediameterofthebushingswithasnapgaugeor othermeasuringdeviceinthreedifferentpositions.Ifthelargest diameterisgreaterthanthespecification,replacethestatorshaft assembly. Stator Shaft Bushing Whenthestatorshaftbushingsareworn,alsochecktheringgroovesof theinputshaft.Wornbushingsallowtheinputshafttowobbleandthe topsurfaceofthegrooveswillwear,closingthewidthofthegroove. Pump Bushing Diameter Stator Shaft Bushing Inspection NOTE:
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