Meritor Tire Inflation Systems (MTIS)

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Revised 09-02Meritor TireInflation Systems (MTIS)by P.S.I.Installation and Maintenance Manual 14P

Service NotesBefore You BeginService NotesThis manual provides installation andmaintenance procedures for the Meritor TireInflation Systems by P.S.I. Use the procedures inthis manual to install the tire inflation system oneither new trailer axles at original equipmentmanufacturers (OEM) or in-service trailer axles atfleets. Before you begin procedures:1. Read and understand all instructions andprocedures before you begin to servicecomponents.2. Read and observe all Caution and Warningsafety alerts that precede instructions orprocedures you will perform. These alerts helpto avoid damage to components, seriouspersonal injury, or both.3. Follow your company’s maintenance andservice, installation, and diagnosticsguidelines.4. Use special tools when required to help avoidserious personal injury and damage tocomponents.Safety Alerts, Torque Symbol and NotesA Warning alerts you to anAccess Product and Service Informationon Our WebsiteVisit the DriveTrain PlusTM by ArvinMeritor TechLibrary at arvinmeritor.com to access and orderproduct and service information.To Order Information by PhoneCall ArvinMeritor’s Customer Service Center at800-535-5560 to order publications.O Meritor Tire Inflation Systems (MTIS) by P.S.I.Technical Guide (TP-9914)O Trailer Axles (Maintenance Manual 14)O Drivetrain PlusTM by ArvinMeritor TechnicalElectronic Library on CD. Features productand service information on most Meritor,ZF Meritor and Meritor WABCO products. 20. Order TP-9853.How to Order Tools and SuppliesSpecified in This ManualCall ArvinMeritor’s Commercial VehicleAftermarket at 888-725-9355 to order Meritortools and supplies. For Grainger tools, visit theirwebsite at www.grainger.com to locate abranch near you.WARNING instruction or procedurethat you must followexactly to avoid seriouspersonal injury.CAUTIONA Caution alerts you to aninstruction or procedurethat you must followexactly to avoid damage tocomponents.A torque symbol alerts youto tighten fasteners to aspecified torque value.NOTEPage -iiA Note providesinformation or suggestionsthat help you correctlyservice a component.Copyright 2002ArvinMeritor, Inc.Maintenance Manual 14PRevised 09-02

Table of ContentsSystem Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iSection 1: IntroductionFor Complete Maintenance and Service Procedures for Meritor Trailer Axles . . . . . . . . . . . . . . . . . . . .1System OverviewHow the Meritor Tire Inflation System (MTIS) by P.S.I. WorksWheel End AssemblyControlsIndicator Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2Installation TypesAxle TypesSection 2: InstallationAxle Air Fitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4Prepare Axles with Hollow Spindles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5Prepare Axles with Solid Spindles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10Stator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13Wheel-End ComponentsAir Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15Electrical Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18Wheel-End Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20DecalsSection 3: Check System OperationCheck System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21Section 4: Pre-Service CheckPre-Service Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25Section 5: Inspection and MaintenanceTire Inflation System Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27Indicator LightTiresCheck Tire PressureTire Test Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28Change Tire Inflation System Tire Pressure SettingMaintenanceTurn OFF the System Before Performing MaintenanceRemove and Replace a TireHose Valve Cores . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29Remove the Through-Tee Before Installing a Hubcap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30Section 6: Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31Section 7: Special Tools and Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

System OverviewSystem OverviewINDICATOR LIGHTINDICATORLIGHT30"(76 CM)WHEEL-END ASSEMBLYHOSESTATORVENTTHROUGH-TEEPRESS PLUGCONTROLSAXLESPINDLEHUBCAPSELF-DRAININGFLOW SENSINGFILTERSWITCHPRESSUREPROTECTIONVALVE (PPV)DEFLECTOR SHIELDHOSESHUT-OFFPETCOCKVALVE SYSTEM PRESSUREADJUSTMENT KNOBAIR SUPPLYLINETRAILERAIR TANKPRESSUREPROTECTION VALVEMaintenance Manual 14PRevised 09-02Copyright 2002ArvinMeritor, Inc.Page i

Section 1IntroductionFor Complete Maintenance andService Procedures for MeritorTrailer AxlesStator and Through-TeeThe stator is located inside the axle spindle andthe through-tee is attached to the hubcap.Pressurized air passes from the axle interior tothe rotating hub through a tube extending fromthe through-tee into the stator. A dynamic seal,located in the through-tee, allows rotation withoutloss of air pressure.Section 1IntroductionRefer to Maintenance Manual 14, Trailer Axles.To obtain this publication, refer to the ServiceNotes page on the front inside cover of thismanual. For trailer axles not manufactured byMeritor, refer to the trailer axle manufacturer’sprocedures.VentThe vent ensures that there is no pressure buildupin the wheel end.System OverviewDeflector ShieldHow the Meritor Tire Inflation System(MTIS) by P.S.I. WorksThe deflector shield helps keep contaminants suchas dirt and water from entering the wheel end.The MTIS uses compressed air from the trailer toinflate any tire that falls below the system airpressure setting during operation. Air from theexisting trailer air supply is routed to a controlbox, then into each axle.Acting as a conduit, axles carry air through arotary union assembly at the spindle end, whichthen distributes air to each tire as needed.An indicator light informs the driver of anexcessive air pressure loss, providing advancedwarning of maintenance or service requirements.If a tire failure should occur, check valves in thetire delivery lines prevent loss of pressure fromthe remaining tires.HubcapThe hubcap features a vent and breather toprevent pressure buildup in the wheel end and adeflector shield to help prevent outsidecontaminants from entering the wheel end.Hubcaps for oil-lubricated wheel ends have a fillplug for adding lubricant.Press PlugThe press plug is used in axles with hollowspindles to seal off the pressurized axle interiorfrom the wheel end and provide a means ofholding and securing the stator.ControlsWheel-End AssemblyShut-Off ValveHosesThe shut-off valve stops air delivery to the system.A hose is a flexible valve stem extension, whichmechanically opens the tire valve stem and allowsair to pass into a tire. There are two sizes of tireinflation system hoses: short, for 17- and 19-inchwheels; and long, for 22.5- and 24.5-inch wheels.A check valve located at the knurled end of a hoseallows air to flow in only one direction — to a tire.This protects each tire from loss of air pressure ifthe tire inflation system, or any tire, loses airpressure during operation.Maintenance Manual 14PRevised 09-02Self-Draining FilterThe self-draining filter automatically removesliquids and contaminants from the system.PetcockThe petcock drains pressure from the tire inflationsystem. This enables you to perform maintenanceon either the trailer axle components or the tireinflation system.Copyright 2002ArvinMeritor, Inc.Page 1

Section 1IntroductionPressure Protection Valve (PPV)Hollow SpindleThe pressure protection valve (PPV) ensures that airis available for other trailer functions. Air will not bedelivered to the tire inflation system until the trailerair system is charged to at least 80 psi (551 kPa).The PPV also maintains air tank pressure if a tire ora tire inflation system component is damaged.Most of the time, a hollow spindle trailer axlehas a spindle that’s integrally formed out of axletube material. A welsh plug is pressed into amachined recess in the spindle end. If you’reunsure of the axle type, contact the axlemanufacturer. Figure 1.1.System Pressure Adjustment KnobInstallation SequenceThe system pressure adjustment knob adjustssystem air pressure.1.2.3.4.5.Flow Sensing SwitchThe flow sensing switch illuminates the indicatorlight when the system delivers an excessiveamount of air to either a leaking tire or a leakingtire inflation system component.Install the axle air fitting.Prepare the axle.Install the stator.Install wheel-end components.Follow remaining sections in the manual.Figure 1.1HOLLOW SPINDLEIndicator LightWELSHPLUGAn indicator light mounted on the front of thetrailer comes ON when the system delivers anexcessive amount of air due to air leaking froma tire or a tire inflation system component.Installation TypesOEM and FleetsUse the procedures in this manual to install thetire inflation system on either new trailer axlesat original equipment manufacturers (OEM) orin-service trailer axles at fleets.Axle ManufacturersThe tire inflation system can be installed ontrailer axles manufactured by Meritor, Holland,Hendrickson, Ingersoll, Dana, Eaton and Sudisa.When installing the system, follow themaintenance instructions from the various axlemanufacturers.Axle TypesSolid SpindleA solid spindle trailer axle has a flat end and aforged spindle welded to the axle tube. If you’reunsure of the axle type, contact the axlemanufacturer. Figure 1.2.Installation Sequence1.2.3.4.5.Install the axle air fitting.Prepare the axle.Install the stator.Install wheel-end components.Follow remaining sections in the manual.The installation sequence for tire inflation systemcomponents can vary according to axle type. Referto the following guidelines.Page 2Copyright 2002ArvinMeritor, Inc.Maintenance Manual 14PRevised 09-02

Section 1IntroductionFigure 1.2Figure 1.4SOLID SPINDLESTATORPRESS PLUGPrepared by the ManufacturerA prepped trailer axle has the followingprovisions.O The top-center hole is tapped to accept the tireinflation system axle air fitting, and a plug isinstalled in this hole. Some axle manufacturersmay select an alternate location for this hole.Figure 1.3.O The system press plug and stator are installedin the axle spindle. Figure 1.4.O Debris has been cleaned from the axle interior.Installation Sequence1. Remove the plug from the tapped axletop-center hole.2. Install the axle air fitting.3. Install wheel-end components.4. Follow remaining sections in the manual.Figure 1.3TAPPED TOP-CENTER HOLEPLUGMaintenance Manual 14PRevised 09-02Copyright 2002ArvinMeritor, Inc.Page 3

Section 2InstallationSection 2InstallationFigure 2.1WARNINGAXLETOP-CENTERTo prevent serious eye injury, always wear safeeye protection when you perform vehiclemaintenance or service.Park the vehicle on a level surface. Block thewheels to prevent the vehicle from moving.Support the vehicle with safety stands. Do notwork under a vehicle supported only by jacks.Jacks can slip and fall over. Serious personalinjury and damage to components can result.Axle Air Fitting1. Park the vehicle on a level surface. Block thewheels to prevent the vehicle from moving.Figure 2.2NOTE: If the axle manufacturer has installed atop-center hole in the axle, use this hole as a pilotwhen you drill a hole for the air fitting.DRILL2. Locate the top-center of the axle, which is thepreferred location for the axle air fitting.Figure 2.1.3. Use drilling lubricant and a variable speedelectrical drill to drill an 11/32-inch diameterhole STRAIGHT into the top-center of the axle.Figure 2.2.4. Use tapping lubricant and a 1/8-inch NPT tapto tap the drilled hole STRAIGHT into the axle.Do not run the tap completely through thehole. Leave some thread taper in the tappedhole. Figure 2.3.Figure 2.35. Apply Teflon tape to the 1/8-inch NPT threadsof the axle air fitting. Hand-tighten the fittinginto the tapped hole. Figure 2.4.TAP6. Use a 1/2-inch wrench to tighten the fitting twoadditional turns. Continue to tighten it until thefitting faces TOWARD the side of the trailerwhere you’ll install the system control box.Figure 2.5.Page 4Copyright 2002ArvinMeritor, Inc.Maintenance Manual 14PRevised 09-02

Section 2InstallationFigure 2.6Figure 2.4AXLEAIRFITTINGFigure 2.7Figure 2.5AXLEAIR FITTINGTOWELPrepare Axles with Hollow SpindlesCAUTIONCover wheel ends at both ends of the axle duringsystem installation to prevent contaminants fromentering the wheel end. Damage to the bearingsand seals can result.NOTE: Do not reuse either the hubcap gasket orthe oil.NOTE: A slide hammer and welsh plug removalspear are available from Meritor to help removespindle welsh plugs. Refer to Section 7. Figure 2.8.3. Use a slide hammer fitted with the welsh plugremoval spear to remove the spindle welshplugs from both ends of the axle. Be careful tonot score the inside diameter of the spindlebore. Figure 2.9.Figure 2.81. Place a container under the hubcap to receivethe draining oil. Remove the hubcap andhubcap gasket. Figure 2.6.WELSH PLUGREMOVAL SPEAR2. Cover the wheel ends at both ends of the axlewith a clean towel. Figure 2.7.SLIDE HAMMERMaintenance Manual 14PRevised 09-02Copyright 2002ArvinMeritor, Inc.Page 5

Section 2InstallationFigure 2.10Figure 2.9MANDRELWELSH PLUGREMOVAL SPEARSLIDE HAMMERSTRAIGHTDIE GRINDERBOREPOLISHERFigure 2.11CAUTIONUse a bore polisher to remove all old adhesivefrom the spindle bore before you apply retainingcompound to install the press plug. If retainingcompound does not contact a metal surface, it willnot harden. Damage to components can result.BORE POLISHING4. Choose the correct sized bore polisher bymatching the axle manufacturer and model tothe bore polishers listed in Section 7.Figure 2.10.5. Polish the spindle bore to remove all adhesiveresidue left from the old spindle plug and anymachining marks on the spindle bore surface.Figure 2.11.Figure 2.12O If the axle spindle is equipped with cotterpin holes: Use a round abrasive tool toremove all metal burrs and sharp edgesfrom the spindle bore side of the cotter pinholes. Figure 2.12.Page 6Copyright 2002ArvinMeritor, Inc.COTTERPIN HOLEABRASIVETOOLMaintenance Manual 14PRevised 09-02

Section 2InstallationFigure 2.14CAUTIONUse a cleaning wand and high-volume air to cleandebris from the axle interior before you installthe Meritor Tire Inflation Systems by P.S.I.Check that the axle is clear of debris, includingloose rust, scale and machining residue. Acontaminated axle can damage the tire inflationsystem and void the warranty.FLASHLIGHTNOTE: Refer to Section 7 for instructions on howto build a cleaning wand.6. Connect a cleaning wand to a high-volume airsupply. Slowly push the wand through theaxle, until it exits the opposite end. During thisoperation a steady stream of air will beblowing from the axle spindle. Figure 2.13.SPINDLEENDSPINDLEENDNOTE: Current production press plug driveadaptors are identified with a number stamped onthe part. Earlier adaptors were not marked.8. Choose the correct press plug drive adaptorby matching the axle manufacturer and modelto the press plug drive adaptors listed inSection 7. Figure 2.15.Figure 2.13CLEANINGWAND9. Install the press plug drive adaptor onto thedrive handle. Figure 2.16.Figure 2.15PRESS PLUG DRIVE ADAPTORSCLEANINGWANDSHOP AIRSUPPLY-017. Check the inside of the axle tube with aflashlight by shining the light at one end of thespindle and looking through the opposite end.Confirm that all debris, including loose rust,scale and machining residue has beenremoved. Figure 2.14.O If necessary: Repeat the cleaning procedureuntil the axle is clear of debris. For debristhat’s difficult to remove, it may be helpfulto push the cleaning wand through the axlefrom the opposite end.-02-03-04DRIVE HANDLEFigure 2.16PRESS PLUGDRIVE ADAPTORDRIVE HANDLEMaintenance Manual 14PRevised 09-02Copyright 2002ArvinMeritor, Inc.Page 7

Section 2Installation10. Clean the exposed O-ring surface and outsidediameter surface of one press plug using atowelette provided in the kit. Use a newtowelette provided in the kit for eachwheel end. Protect the cleaned plug fromadditional contaminants. Figure 2.17.11. Use the same towelette to clean one spindlebore of contaminants such as grinding dust,grease and oil. Protect the cleaned bore fromadditional contaminants. Figure 2.18.Figure 2.17PRESS PLUGCAUTIONOnly use the retaining compound supplied in thetire inflation system kit when you install the pressplug. Only apply retaining compound to theOUTSIDE diameter of the press plug. Do not applyit to the inside diameter of the spindle bore, pressplug stator threads or axle spindle threads.Damage to components can result.NOTE: The installation kit contains enoughretaining compound for four wheel ends. Dividethe material equally among the wheel ends. Thepress plug must be installed within 10 minutes ofapplying the retaining compound to ensure thatthe compound hardens correctly.12. Put on a new pair of latex gloves. Apply theretaining compound included in theinstallation kit evenly to the OUTSIDEdiameter of the press plug. Figure 2.19.TOWELETTE13. Insert the press plug into the spindle bore untilthe plug stops in the bore. Figure 2.20.O For Holland Propar Axles Only: The pressplug slots must align with the spindle cotterpin holes. Figure 2.21.Figure 2.1814. Check that the press plug protrudes from1/8-1/4-inch (3.175 mm to 6.35 mm) from theend of the spindle. Figure 2.22.O If the press plug protrudes outside thisacceptable range: Contact ArvinMeritor’sCustomer Service Center at 800-535-5560before proceeding.TOWELETTE15. Insert the press plug drive adaptor into thepress plug. Figure 2.23.Figure 2.19Apply retaining compoundto this surface.PRESSPLUGPage 8Copyright 2002ArvinMeritor, Inc.Maintenance Manual 14PRevised 09-02

Section 2InstallationFigure 2.20Figure 2.23PRESS PLUGDRIVEADAPTORPRESSPLUGPRESSPLUGFigure 2.21CAUTIONHOLLAND PROPAR AXLESSPINDLECOTTERPIN HOLESLOTPRESSPLUGThe installed press plug must be seated square tothe end of the spindle and inset at or below anychamfer in the axle spindle bore. A press plug thatis flush with the spindle end is not seatedcorrectly. Damage to components can result.NOTE: The drive adaptor sets the press pluginstallation depth. The tire inflation system can bepressurized 30 minutes after installation of thepress plug.16. Use a four-pound hammer to drive the pressplug into the spindle bore, until the driveadaptor bottoms out squarely on the end ofthe spindle. There will be a definite change inthe sound and feel of the hammering whenthe drive adaptor bottoms out. Figure 2.24.Figure 2.221/8-1/4-INCH(3.175-6.35 MM)PRESSPLUGFigure 2.24BOTTOMS OUT HEREPRESS PLUGDRIVEADAPTORPRESS PLUGMaintenance Manual 14PRevised 09-02Copyright 2002ArvinMeritor, Inc.Page 9

Section 2Installation17. Remove any retaining compound from thespindle and press plug drive adaptor.Figure 2.25.Figure 2.26MERITOR’S DRILL JIGGUIDE RAILBUSHINGSFigure 2.25DRILL MOTORGUIDE DRILLBITASSEMBLYRAILSDRILLGUIDEBITPRESS UIDESPINDLEINSTALLATIONNUTFigure 2.27Prepare Axles with Solid SpindlesTWOTHREADSCAUTIONUse only Meritor drill jig, part number 81023-00,when you drill a hole into a solid spindle axle toinstall the tire inflation system. The drill jig helps toensure that the hole will be square to the spindleend. Do not drill a hole into the axle by hand, use adrill jig from another manufacturer or install thedrill jig as an assembly. Damage to componentscan result.OUTERSPINDLENUTFigure 2.28NOTE: To obtain Meritor’s drill jig, refer to theService Notes page on the front inside cover ofthis manual.1. Only use Meritor’s drill jig, part number81023-00, to drill a hole into a solid spindleaxle. Figure 2.26. Correctly support the drill jigwith at least two full spindle threads.Figure 2.27. If necessary, remove the traileraxle outer spindle nut to expose at least twofull threads. Do not drill a hole into the axle byhand, use a drill jig from anothermanufacturer, or install the drill jig as anassembly.TOWEL2. Cover the wheel end at both axle ends with aclean towel to prevent contaminants fromentering the wheel ends. Figure 2.28.3. Clean the drill jig spindle installation nut andthe axle spindle nut. This will allow the drill jigto be correctly squared to the axle.Page 10Copyright 2002ArvinMeritor, Inc.Maintenance Manual 14PRevised 09-02

Section 2Installation4. Install the 12 x 7/16-inch diameter drill bit intothe drill.Figure 2.315. Thread the guide rails onto the axle spindle.Use a bar to tighten the rails. Figure 2.29.Figure 2.29DRILL BITBARDRILL BITGUIDEGUIDERAILSFigure 2.32GUIDERAILS6. Slide the drill motor assembly onto the guiderails. Insert the drill bit into the drill bit guide.Figures 2.30 and 2.31.7. Tighten the feed guide onto the guide rails.Figure 2.32.FEEDGUIDE8. Turn the advancing handle CLOCKWISE untilthe drill bit bottoms out on the spindle.Back off the handle one full turn. Figure 2.33.Figure 2.33Figure ntenance Manual 14PRevised 09-02Copyright 2002ArvinMeritor, Inc.Page 11

Section 2InstallationNOTE: No lubrication is needed during the drillingoperation.Section 2InstallationFigure 2.35DRILL JIGINSTALLED9. Turn the motor ON and drill into the spindleby slowly turning the advancing handleCLOCKWISE with a smooth, steady feed.Remove the drill bit guide periodically toremove metal shavings. Check that the guiderails are clean to ensure that the drill willoperate correctly. Figures 2.33 and 2.34.O If the drill stalls or lags: Back off theadvancing handle counterclockwise a fewturns while the drill is on, then resumedrilling. Figure 2.35.O When the drill bottoms out or breaksthrough the solid spindle: Turn theadvancing handle counterclockwise a fewturns while the drill is on. Release the feedguide and pull the drill out of the hole.Figure 2.36O If the 12-inch drill bit does not breakthrough: Install the 18 x 7/16-inch drill bit.Use the same procedure to continue to drilluntil you break through the solid spindle.TOWEL10. Remove the drill jig components from thespindle. Clean the axle end. Use shop airto clean the drilled hole. Figure 2.36.SHOPAIRCAUTIONAlways use a tap guide and tapping lubricantwhen you tap a hole into an axle spindle. This willhelp to ensure that you tap the spindle correctlyand prevent damage to components.11. Install the tap guide onto the axle spindle.Tap the axle spindle with a 1/4-inch NPT tap.Use tapping lubricant. Figure 2.37. Refer toSection 7.Figure 2.3412. Remove the tap guide. Clean the axle end. Useshop air to clean the drilled and tapped hole.Figure 2.36.O If the outer spindle nut was removed toinstall the drill jig: Reinstall the spindle nutusing the axle manufacturer’s instructions.Verify that wheel end play is correct. ForMeritor axles, refer to MaintenanceManual 14, Trailer Axles. To obtain thispublication, refer to the Service Notes pageon the front inside cover of this manual.Figure 2.37TOWELTAPGUIDEMETAL SHAVINGSPage 12Copyright 2002ArvinMeritor, Inc.Maintenance Manual 14PRevised 09-02

Section 2InstallationStatorFigure 2.401. Use the following procedure to install a newcurrent production stator or reinstall oneyou’ve removed.O If you’re installing a new stator: Currentproduction stators have pre-applied sealanton the threads. It is not necessary to useTeflon tape. Figure 2.38. Proceed to Step 2.O If you’re removing and reinstalling a stator:Apply Teflon tape to the stator threads.Figure 2.38. Proceed to Step 2.2. Hand-tighten the stator into the spindle.Use a 5/8-inch wrench to tighten the statorapproximately 2-1/2 additional turns.Figures 2.39 and 2.40.STATORWheel-End ComponentsHubcaps are available in bolt-on or screw-onmodels, and either grease or oil models. All tireinflation system hubcaps include three vent holesdesigned to prevent pressure buildup in the wheelend.Figure 2.38NEW STATOROil hubcaps feature a side-mounted oil fill plugand vent extensions located in the hubcap interiorto keep oil from leaking from the hubcap ventholes. Grease hubcaps do not include thesefeatures. Figures 2.41, 2.42 and 2.43.PRE-APPLIEDSEALANTTEFLONTAPEThe through-tee assembly consists of the tube,vent, deflector shield and tee. Figure 2.44. REINSTALLING STATORFigure 2.41THREEVENTSFigure 2.39TOWELINTERIOR GREASE HUBCAPSTATORMaintenance Manual 14PRevised 09-02Copyright 2002ArvinMeritor, Inc.Page 13

Section 2Installation2. Use your fingers to check to ensure there is nodebris on the through-tee tube. Figure 2.45.Figure 2.42THREE VENT EXTENSIONSNOTE: When you insert the through-tee tube intothe stator, it’s normal to feel some resistancewhen the tube contacts the stator O-ring.3. Carefully install the through-tee assemblySTRAIGHT into the hubcap to insert the tubeinto the stator. Figure 2.46.4. Check that the tire valve stems are 180 degreesopposite each other. Figure 2.47. The valvestems must be in this position to install the tireinflation system.INTERIOR OIL HUBCAPFigure 2.43OIL FILL PLUGCAUTIONWhen you install the through-tee assembly duringtire inflation system installation procedures, donot overtighten the through-tee. Damage to thethrough-tee and hubcap threads can result.5. Hand-tighten the through-tee assembly. Thenuse a 5/8-inch wrench to tighten thethrough-tee until the fittings point TOWARDthe tire valve stems. Figures 2.47 and 2.48. Donot exceed one full turn with the wrench. Donot over-tighten the through-tee.THREEWHEEL-ENDVENTSFigure 2.44Figure TEEWARNINGVerify that the vents in a greased wheel end arenot blocked with grease. Clear blocked vents,which will prevent system air from ventingthrough the wheel end. Serious personal injuryand damage to components can result.1. Follow the manufacturer’s instructions toinstall the hubcap. For oil hubcaps, locate theoil fill plug on the top. Figure 2.43.Page 14Copyright 2002ArvinMeritor, Inc.Maintenance Manual 14PRevised 09-02

Section 2InstallationFigure 2.46CAUTIONTUBETHROUGH-TEEASSEMBLYDuring installation, hand-tighten the tire inflationsystem hoses to the tire valve stems, then use awrench to tighten the hoses to the correctspecification. Do not overtighten the connection,which can damage the hose seal and cause a tireto deflate when the trailer is parked. Damage tocomponents can result.6. Hand-tighten the tire inflation system hosesto the tire valve stems. Then use a 7/16-inchwrench to tighten the connections anadditional half-turn. Do not overtighten theconnection, which can damage the hose sealand cause a tire to deflate when the trailer isparked. Figure 2.49.Figure 2.47THROUGH-TEE7. Hand-tighten the tire inflation system hoses tothe through-tee. Do not use pliers.Figure 2.49TIREVALVESTEMTIREVALVESTEMSFigure IONSYSTEMHOSEAir ComponentsControl BoxTHROUGH-TEEMaintenance Manual 14PRevised 09-02THROUGH-TEEIn most situations, install the tire inflation systemcontrol box to the ROADSIDE REAR of thesubframe facing the REAR of the trailer. Mount thebox in a location that’s accessible, free of hazardsand positioned so the box door can be opened.Use the following procedure to mount the boxeither to the supplied mounting bracket or directlyto the trailer subframe.Copyright 2002ArvinMeritor, Inc.Page 15

Section 2InstallationMounting Bracket InstallationFigure 2.52CONTROL BOXNOTE: You can either weld or bolt the suppliedmounting bracket to the trailer subframe.Inflation System Control Box1. Install the mounting bracket to position thecontrol box as described above under ControlBox. Use one of the following installationprocedures.Meritor Tire Inflation SystemO Weld the bracket to the subframe; orO Use the supplied mounting bracket as atemplate and drill two 5/16-inch (0.80 cm)holes into the trailer subframe. Use thesupplied fasteners, washers and locknuts tosecure the bracket to the subframe.Figures 2.50 and 2.51.Figure 2.53CONTROLBOXFigure 2.50FASTENERMOUNTINGBRACKETLOCKNUTWASHERTYPICAL THREELOCATIONSTrailer Subframe Installation1. Locate the control box as described in ControlBox in this section. Use the supplied mountingbracket as a template and drill three 1/4-inch(6.36 mm) holes into an appropriate mountingsurface. Figure 2.54.Figure 2.51SUBFRAMEMEMBERLOCKNUT2. Use the supplied 1/4-inch (6.36 mm) fasteners,washers and locknuts to install the control boxdirectly to the subframe. Figures 2.53 and 2.55.WASHERWASHERFigure 2.54FASTENERMOUNTINGBRACKETMOUNTINGBRACKETTYPICAL TWOLOCATIONS2. Use the supplied 1/4-inch (6.36 mm) fasteners,washers and locknuts to install the control boxto the mounting bracket. Figures 2.52 and 2.53.Page 16Copyright 2002ArvinM

Meritor Tire Inflation Systems (MTIS) by P.S.I. Technical Guide (TP-9914) O Trailer Axles (Maintenance Manual 14) O Drivetrain Plus TM by ArvinMeritor Technical Electronic Library on CD. Features product and service information on most Meritor, ZF Meritor and Meritor WABCO products. 20. Order TP-9853. How to Order Tools and Supplies

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