SWS - Stemco Quick Reference 2011 - CARQUEST Auto Parts

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BEARING ADJUSTMENTPro-Torq® Installation Procedure for Hubs with Manually Adjusted Wheel Bearingsan EnPro Industries companySTEP 1. Remove The Keeper From The Nut:Use a screwdriver to carefully pry thekeeper arm from the undercut grooveon each side until the keeper is released.IMPORTANTPro-Torq ® InstallationProcedure for PreSet ®or LMS ® Hubs:Pro-Torq ® spindle nutsmay be used with PreSet ®or LMS ® hub assemblies.When used with thesesystems, it is importantto follow the hubmanufacturers’ productspecific installationinstructions. For PreSet®and LMS ® hub assemblies,torque the Pro-Torq ®spindle nut to a minimumof 250 ft. lbs. Engage thekeeper. If the keeper cannot be engaged, advancethe spindle nut until it canbe engaged. DO NOT BACKOFF THE SPINDLE NUT.WARNINGFailure to follow thisinstruction could causethe wheel to come off andcause bodily injury.ThePRO-TORQ ® Spindle Nutis sold as an assemblywith the keeper in place.DO NOT attempt to placethe nut on the spindle ortighten or loosen the nuton the spindle while thekeeper is locked insidethe nut. Doing so maydeform the keeper andallow the nut to unthreadduring operation. DONOT bend or manipulatekeyway tang in any way.Doing so may causethe tang to break off inservice. Failure to backoff the nut will cause thebearings to run hot andbe damaged.STEP 2. Seat the Bearing:With hub or hub/drum only:Using a torque wrench:1 (A) Tighten the nut to 200 ft-lbs.Spin the wheel at least one full rotation.(B) Tighten the nut to 200 ft-lbs.Spin the wheel at least one full rotation.(C) Tighten the nut to 200 ft-lbs.2 Back off until loose.With hub/drum/wheels:Using a torque wrench:1 Tighten the nut to 200 ft-lbswhile the wheel is rotating.2 Back the nut off until it is loose.STEP 3. Adjust The Bearing:With hub or hub/drum only:Using a torque wrench:1 (A) Tighten the nut to 100 ft-lbs.Spin the wheel at least one full rotation.(B) Tighten the nut to 100 ft-lbs.Spin the wheel at least one full rotation.(C) Tighten the nut to 100 ft-lbs.2 Back the nut off one raised facemark (according to chart).With hub/drum/wheels:Using a torque wrench:1 Tighten the nut to 100 ft-lbswhile the wheel is rotating.2 Back the nut off one raisedface mark (according to chart).FINAL BACKOFFPart NumbersBackoffTrailer Axle Nut447-4723, 447-4724,449-4973 1/8 turnTrailer Axle Nut447-4743 1/4 turnSteering Spindle Nut448-4836, 448-4838,448-4839, 448-4863,448-4864, 448-4865 1/4 turnSteering Spindle Nut448-4837, 448-4840 1/3 turnDrive Axle Nut449-4904, 449-4973,449-4974, 449-4975 1/8 turn54 Order Entry 1-800-527-8492 Fax 1-800-874-4297 <strong>2011</strong>
STEP 4. Install the Keeper:Orange side facing out1 Insert the keeper tab into the undercut groove of the nut and engage the keywaytang in the axle keyway. Insert keeper tab with the orange side facing out.2 Engage the mating teeth.3 Compress and insert the keeper arms, one at a time, into the undercut groovewith a screwdriver.For Steering Spindle Nut448-4836, 448-4839, 448-4840, 448-4863, 448-4864, and 448-48651 Align the flat of the keeper with the milled flat on the spindle and insert the keepertab into the undercut groove of the nut. Insert keeper tab with the orange side facing out.2 Engage the mating teeth.3 Compress and insert the keeper arms, one at a time, into the undercut groovewith a screwdriver.NOTERecommended practice is to replace the keeper each time thePro-Torq nut assembly is removed for maintenance purposes.STEP 5. Inspect the Installation:Failure to follow this instruction could cause the wheel to come off and causebodily injury. Make sure that the keeper tab and keeper arms are fully seated into theundercut groove. Inspect keyway tang to insure it does not contact the bottom ofthe keyway If contact exists, immediately notify your PRO-TORQ® representative.This procedure will consistently producea bearing setting of .001˝ to .003˝ end play.STEP 6. Acceptable End Play:The dial indicator should be attached to the hub or brake drum with its magnetic base.Adjust the dial indicator so that its plunger is against the end of the spindle with its line ofaction approximately parallel to the axis of the spindle. Grasp the wheel or hub assemblyat the 3 o’clock and 9 o’clock positions. Push and pull the wheel-end assembly in and outwhile oscillating the wheel approximately 45 degrees. Stop oscillating the hub so that thedial indicator tip is in the same position as it was before oscillation began. Read the bearingend-play as the total indicator movement.*Acceptable end-play is .001”- .005”. For single nut self-locking systems, consult manufacturers’specifications. STEMCO assumes no responsibility for other manufacturers’ bearing warranty.FAQS - COMMON CAUSES AND SOLUTIONSQ. Is there a problem with the keeper hitting the bottom of the keyway or the flat of the spindle?A. If contact exists, contact STEMCO Customer Service @ 1-800-527-8492.Q. Is a washer required between the Pro-Torq® Nut and the outer bearing?A. The bearing contact surface is hardened, therefore a washer is not required.One exception is a Ford 12,000# SIFCO steer axle.Q. What if the teeth in the Pro-Torq® Nut do not match-up with the keeper after the final adjustment?A. By very slightly loosening the nut, the teeth will engage the keeper.Q. Why does my keeper have paddles?A. A design improvement to help install the keeper correctly every time. More specific bearing adjustmentprocedures with standard adjustment nuts are addressed beginning on Page 48.PRO TORQ ® INSTALLATION PROCEDURE<strong>2011</strong> Order Entry 1-800-527-8492 Fax 1-800-874-4297 55
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Q U I C K RE F E R E N C EPART NUMB
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Page 64: STEMCO QUALITY PRODUCTSHEAVY DUTYBE
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SWS - Stemco Quick Reference 2011 - CARQUEST Auto Parts

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