WHY YOU SHOULD USE PRELOAD ON PINION …

1 WHY YOU SHOULD USE PRELOAD ONPINION AND RING GEAR Timken Timken BearingsPromoting safe, proper bearing handlingpractices FOR THE HEAVY-DUTY MARKETV olume 5 Issue 4To provide the correct bearing setting, gear meshand system rigidity for your axle, always follow theaxle manufacturer s recommendation for theproper amount of bearing rolling torque on theseshafts. Never exceed the recommended amount ofpreload, as excessive heat build-up will occur,followed by possible bearing burn-up. Use these guidelines, to 3-hole punch Tech Tips and store it in a Bearing Performance Occurs at Slight maximize bearing life, maintain propergear mesh and provide correct rigidity andstiffness, you SHOULD use PRELOAD on pinionand ring gear shafts.

2 Bearings adjusted in PRELOAD are typical on pinionand ring gear shafts of heavy-duty is achieved by adjusting the bearings toa slight amount of bearing rolling torque. Rollingtorque is a measure of a bearing s resistance torotate, indicating tightness in the bearingsetting. Maximizes Bearing Life Optimum bearing performance on these shaftsoccurs at a slight PRELOAD setting (see graph). Maintains Proper Gear Mesh A slight PRELOAD bearing setting assures thatproper gear tooth contact is maintained betweenthe PINION and ring gear. This minimizes gear wearand extends the tooth life of both gears. Debrisin the axle system is reduced when gear wear Proper System Rigidity and Stiffness A slight PRELOAD setting minimizes shaft bending,which lowers bearing misalignment and decreasesseal wear.

3 Likewise, axial shaft movement isminimized as vehicle operating conditions changefrom drive to MAINTENANCE MANUAL ANSWERS YOUR APPLICATION ANDTROUBLESHOOTING QUESTIONSB earing application, troubleshooting and handlingtechniques are just a few of the topics covered in theBearing Maintenance Manual for this manual to learn about thedifferent types of tapered roller bearings used at thevarious locations on each vehicle type. You also will gainan understanding of why a certain bearing type is usedfor a particular application. To receive a copy, fax your request for BearingMaintenance Manual for Transportation Applications(order No. 7279) using the order form below. You alsocan e-mail your order to Make sureto mention Tech Tips, Volume 5, Issue 4 and order in your e-mail FormPlease complete this form and fax it to: 330-471-7032or mail it to:Bearing Maintenance Manual for Transportation ApplicationsThe Timken CompanyMail Code: GNW-371835 Dueber Avenue, SWCanton, Ohio 44706-09324 WARNING!

4 Proper maintenance and handlingpractices are critical. Failure to followinstallation instructions and to maintainproper lubrication can result in equipmentfailure creating a risk of serious bodilyharm. Never spin a bearing withcompressed air. The rollers may beforcefully expelled creating a risk ofserious bodily : _____ Title: _____Company: _____Address: _____City: _____ State: _____Zip: _____Phone:_____ Fax: _____Order No.: 7279 Quantity:_____SAFETY CHECKA ccording to the National TransportationSafety Board, the incidence of wheelseparations is about 750 to 1,050 per Safety Board identified improper truck-wheel maintenance as a potential often cited were inadequate in-serviceinspection guidelines and failure to adhereto recommended maintenance practices.

5 AtThe Timken Company, we care about yoursafety and the safety of everyone on theroad. Please follow recommended wheel-endinspection and maintenance LEADER IN BEARINGS AND STEELT imken is the registered trademark ofThe Timken 2000 The Timken CompanyPrinted in the Order No. 7486