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TFO Wheel End Maintenance Guide

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1. has successfully completed specialized training on SKF s product offerings that are reguired for oper whe d repair mai el en maintenance and safety Counterperson training e Specifically designed for sales and counter personnel e Provides insights to help address customer needs and challenges e Outlines SKF apps and Internet resources available to find part num bers and applications fast e Includes a Sales Pro certificate for session participants THLE Ar ere FAR N AT ii This certificate acknowledges that has successfully completed specialized training on the subject of Wheel End Maintenance Seal Installation and Wheel Bearing Adjustment TFO Clinics for technicians installers e Specifically designed for wheel end maintenance personnel e Offers hands on training for wheel end Inspection removal installation and bearing adjustment e Outlines SKF apps and Internet resources available to find part num bers and applications fast e Includes a training certificate for session participants 1 800 882 0008 www vsm skf com Warranties under the TFO program In addition to helping your fleet reduce wheel end maintenance and its associated costs you can also benefit from special extended warranties on selected products when certain requirements are met The following Aftermarket warranties are provided for the SKF line of Scotseals purchased under the TFO program 1 year or 2 years or 3 year
2. 1 800 882 0008 www vsm skf com SKF Unitized pinion seal The SKF unitized pinion seals offer the optimum sealing performance with extended life The superior design provides a perfectly matched running surface for the sealing lips made from highly engineered fluoroelastomer High temperature capable with extensive exclusion properties provides long life in a highly aggressive application The unitized design incorpo rates the patented wave seal that sweeps lubricant back to the bearings promoting cooler running operation Another innovative feature of this seal adding long life is the 2 metal 2 rubber ID allows for heat dissipa tion while holding a positive grip on the shaft 1 2 metal ID allows heat dissipation Bore Tite OD protective coating eliminates OD leak path 1 2 rubber ID maintains positive grip on yoke Patented Waveseal design sweeps oil back towards bearing for cooler running Thermoplastic bumper positions Fluorelastomer sealing lip suited for sealing lip during installation higher operating temperatures PT6000 tool installs all SKF unitized pinion seals See the complete SKF Unitized pinion seal part listing on page 58 www vsm skf com 1 800 882 0008 17 Product overview Tools and accessories Scotseal installation tools It is recommended that SKF Scotseal Classic and Longlife wheels seals be installed with the Scotseal installation tool Precisely matched centering p
3. 46 NOTE Not to be confused with honing marks which occur in the manufacturing process that produces a precision surface 1 800 882 0008 www vsm skf com Inspection Bearing cage and inner ring The bearing cage Is made of either pressed steel or polymer and Is therefore subject to various forms of damage These cages are deformed due to rough handling dropping on the floor being thrown in a box with other hard components etc or poor installation with shock loads caused by hammer Ing during removal or installation Inspection of the inner ring often requires a sharp eye because the damage can Examine the inner ring raceway by holding the bearing against a light and turning be very subtle The most common types of fatigue damage are shown below the cage slowly Look for pitting flaking discoloration and corrosion Dirt Misalignment Insufficient lubricant www vsm skf com 1 800 882 0008 47 Failure analysis Improper bearing adjustment Large end of roller shows scoring the result of excessive preload Large end of the roller shows spalling the result of insufficient lubrication and or excessive preload Pitting Small end of the roller shows excessive wear the result of loose bearing Pitting of the race as a result of debris in the lube causing surface deformation adjustment Misalignment Misalignment occurs when the center lines of the two bearings are not parallel to each other The ca
4. i i i every 12 months using SKF s inspection check list found at CONE GE E is at 500 000 miles or every 2nd brake service Use a proper supporting device to support the vehicle Carefully release air spring When inspecting wheel ends be sure to block wheels and lift axle brakes WARNING Never work under a unit supported by only a jack Always support the vehicle with stands Block the wheels and make sure the unit will not roll before releasing brakes Always wear eye protection e Stay organized a messy shop is dangerous e Do not use chisels impact wrenches and torches and Inefficient e Do not use hammers directly on seals or bearings e Keep loose components together e t is important to not mix wheel end components bearings are mates that wear together This includes new bearings Hub removal Using a proper hub support remove spindle nut and pull hub assembly off spindle 22 1 800 882 0008 www vsm skf com Inspection of spindle and hub It is important to inspect a vehicles wheel ends periodically for www vsm skf com After inspection you may determine safety and to maximize over the road performance SKF that a wheel end repair is necessary recommends inspecting wheel ends every 100 000 miles or every 12 months using SKF s inspection check list found at 1 3 www vsm skf com 1 800 882 0008 ConMet PreSet hub assemblies require service at 500 000 miles or every 2nd brake service I
5. Dings and dents in the bearing surfaces indicates a Typical surface appearance with repeated effects of Surface appearance caused by electrical arcing drift was used during installation vibration called false brinelling during welding www vsm skf com 1 800 882 0008 45 Failure analysis Inspection Bearing cone The cone of the bearing is a composite assembly consisting of taper rollers and a metal or polymer cage This cage contains the rollers and an inner ring which is the interface surface with the shaft or spindle Since there are many moving parts on the cone you should slowly rotate the cone assembly for proper inspection of all surfaces of the components Make a careful inspection and look for the following e Corrosion e Metallic debris e Pitting e Metallic flakes e Other signs of damage or wear Rollers Cage Shaft mating surface Inner ring Roller end fracture due to heavy stress peaks caused Roller end wear caused by over tightening Roller end cracks indicate excessive loading or by slackness of too loose bearing adjustment lubrication degradation or lack of lubricant excessive misalignment Scoring indicates contamination by dirt grit or Coloration indicates an overheated bearing from Wear marks in bands are due to foreign particles metallic particles straw brown to deep purple Causes are lack of causing mild abrasive wear lubricant misadjustment or excessive loading
6. I D beads Dry exterior If in good illumination you cannot see any residual lubrication between the beads of the outer sleeve the seal may have been installed dry A Scotseal PlusXL does not need special tools but it does need lubrication for proper installation Damaged O D beads If the external ridges appear damaged most likely someone has tried to force the seal in place without proper lubrication Burrs or dirt in the bore can also cause problems but they re not as visible with the thick nitrile rubber protection Worn I D beads A worn I D indicates the seal has been slipping on the spindle Look for three main causes a cocked seal a bent seal section or poor spindle preparation in changing from another seal to the Scotseal PlusXL Damaged D beads Cuts or scarring in the I D is caused by jamming the seal into the spindle or axle tube Misaligning the wheel dolly is usually the result of haste however the work area should be checked to make sure the floor is smooth and free of clutter www vsm skf com 1 800 882 0008 Dented scarred sleeve assembly A dimpled or dented surface indicates damage caused by a problem during installation Lack of lubrication would be a prime suspect but a poorly prepared hub or the use of hard faced tools or seal driver could be the culprit 41 Failure analysis Scotseal PlusXL Opening a Scotseal PlusXL Use pliers to straighten the flange on the sleeve section Be
7. Product overview SKF sleeve nut Help reduce wheel and wheel stud damage The SKF sleeve nut was developed to reduce wheel and wheel stud damage and help prevent unpredictable wheel off situations Sleeve fills in gap between stud and hole eliminating clocking and damage to studs that can cause wheel offs BS AN W 6 mm sleeve 19 mm sleeve Designed for Designed for Steer axles Steer axles Steel wheels Aluminum wheels Drive trailer axles Drive trailer axles Steel wide single wheels Aluminum wide single wheels Drive trailer axles Steel outer steel inner dual wheels See the complete SKF sleeve nut part listing on page 58 16 This system is specifically designed for Class 7 and 8 trucks tractors trailers and any vehicle that uses M22 X 1 5 two piece wheel nuts Benefits of the SKF sleeve nut include e Minimizes the clearance between the wheel stud and the wheel bolt hole e Reduces the movement or clocking of loose wheels e Engages both dual wheels e Protects and covers the threads from wear e Slows the process of wheels loosening e Lengths designed for specific axle applications and wheel configurations 28 mm sleeve 39mm sleeve Designed for Designed for Drive trailer axles Drive trailer axles Steel outer aluminum inner dual wheels Aluminum outer aluminum inner dual wheels Drive trailer axles Aluminum outer steel inner dual wheels
8. The SKF SRT 1 Seal Removal Tool is recommended for removal of most tractor truck dolly or trailer wheel seals With the wheel hub assembly removed from the axle simply insert the hook tip of the tool between the seal and bearing The unique design of the tool allows you to use leverage to easily and safely remove the seal without damaging the spindle Remember performing seal failure analysis will ensure improved performance See pages 36 52 for seal failure analysis information WARNING Do not add a handle extension to the tool This tool is to be used for seal removal only Bearing Inspection Once the seal is removed inspect the bearing cone and cup for any nicks burrs or spalling Reference the failure analysis section in the back of this guide Bearings must be cleaned for inspection and can be re used Use only clean solvents effectiveness of solvent in removing old lubricant depends on how clean the solvent is Good cleaning requires proper equipment such as e Asolvent bath e A filter system and regular changes of the solvent and the filters NOTE Do not allow bearing to sit on the bottom of the con tainer to avoid contact with sediment 24 Bearing cup removal If the bearing cone or cup is damaged you must replace both To remove the cup follow one of the procedures below based on the type of hub you are working with Ferrous hubs Use hydraulic press Aluminum hubs Weld bead around face
9. easy solutions to protect vehicles Krown Corrosion Inhibitor is formulated to help control corrosion in from road debris salt and rust the most damaging of environments Heavy duty trucks endure rugged operating conditions Protect Unlike many competitive products your investment with the Krown family of lubricants Available this rust inhibitor contains no solvents in 55 gallon drums 5 gallons and easy to apply aerosol spray which are hazardous to the environ cans ment dangerous to the user and damaging to paint plastic and rubber Tractor service ao e Bunk locks e Door hinges latches and rollers e Hood hinges and latches Interior cab e Fuel pedal and base linkage Cab trailer connection e Fifth wheel mounting area linkage locks and slider e Storage box locks Tool boxes e Sliding bogies Bogie lock e Door jambs and internal door hardware e Frame rails and hardware Under the hood e Flectrical connections alternator battery and starter e Battery hold downs e Relays and solenoids e Fuse panels Circuit breakers Other areas e Light cord ends Sockets i r e Fuel tank straps Wheel ends Contact SKF Customer Service or your SKF sales representative to set up a Krown maintenance program 20 1 800 882 0008 www vsm skf com Trailer service Other areas Interior Under e Frame rails e Upper coupler e Dolly legs Wheel end e Tandem assembly e R
10. identification for specific applications SKF tapered bearing sets e Help the installer do the job right e Ensure longer bearing life e Help prevent premature failure e Increase truck and trailer uptime e Available for all popular applications Cup Cage Rollers Inner race 10 1 800 882 0008 www vsm skf com Half stand tapered bearing sets for PreSet hub assemblies SKF also provides specifically toleranced half stand tapered bearing sets for the PreSet hub assemblies e World class quality of SKF a global OE supplier e Precision manufactured to tighter dimensional tolerances specified by ConMet e Superior design and materials reduce friction and provide excellent reliability under heavy loads and misaligned conditions e Approved as an OE tapered bearing set in PreSet hub assemblies beginning in 2007 See the complete SKF tapered bearing sets part listing and interchange chart on page 56 aa N re ms 2 N PT kee i _ T Vi i a i sg kficom 1 800 882 0008 ae i ij Fy Product overview SKF Rebuild kits for PreSet PreSet reliability and SKF quality in one convenient box SKF addressed a big void in the commercial vehicle market by being the first to introduce an all inclusive Rebuild kit for PreSet hub assemblies SKF s rebuild kit contains everything needed for successfully maintaining the wheel end and returning the truck trailer to service It includ
11. inner BR47686 BR47620 HD209 SET411 SET412 FF Steer Axle inner amp N Trailer Axle outer HM212047 HM212011 HD202 SET412 SET413 FF Steer Axle inner amp N Trailer Axle outer HM212049 HM212011 HD200 SET413 SET414 N Trailer Axle inner HM218248 HM218210 HD201 SE aie SET415 P Trailer Axle inner amp outer HM518445 HM518410 HD208 SET415 SET416 Trailer Axle BR45291 BR45220 N A SET416 SET417 Trailer Axle BR47890 BR47820 N A SET417 SET418 Front Steer Axle inner H715334 H715311 N A SET418 SET419 Front Steer Axle inner H715343 H715311 N A SET419 SET420 Front Steer Axle inner H715345 H715311 N A EmO SET421 Rear Axle inner Mack HM516449 A HM516410 HD214 SET421 SET422 Rear Axle inner Mack HM516449 C HM516410 HD212 SETA 22 SET423 FL Steer Axle inner 6461 A BR6420 HD218 SET423 SET424 FL Steer Axle outer 555 S 552 A HD217 SET424 SET425 Front Steer Axle Trailer Axle inner amp Rear Axle outer Mack BR567 BR563 HD216 SET425 SET426 Rear Axle outer Mack BR4 6 9 BR47620 HD215 SET426 SET433 HD Tapered Set BR594 592 A N A N A SET439 FF Steer Axle inner Volvo HM212049 X HM212011 N A SEM SETA99 HD Tapered Set BR68 BR6 2 N A N A Half stand interchanges Timken LMS SKF set No ConMet set No SKF cone SKF cup set no Timken cone Timken cup Position PreSet half stand interchanges SET427 107500 RBT10433 LBT10433 SEMA2 NP899357 NPOZG67 73 Inner FF front SET427 107500 RBT10433 LBT10433 SEAN NP899357 NPO26773 Outer TN trailer SET428 107501
12. 0008 www vsm skf com Failure analysis Scotseal PlusXL Internal inspection primary and radial dirt lip wear patterns Good primary lip pattern You should see two parallel lines The primary lip line Is slightly wider than the radial lip marking because it s a SKF Waveseal design Primary lip wear pattern Radial dirt lip wear pattern Wide wide If both of the tracks formed by the primary and dirt lips are wide chances are the whole wheel assembly is moving in and out at an excessive rate End play like this causes leaks as well as increased tire wear The solution of course is proper bearing EA EF adjustment eee ET S r T ee E EE EE RE me em F gesl Primary lip wear pattern Radial dirt lip wear pattern Wide thin If the primary seal lip line bottom is extra wide while the radial dirt lip line top is light there is excessive pressure on the primary lip For steer and trailer axles that can be a plugged vent on drive axles the tube vent may be locked Primary lip wear pattern Radial dirt lip wear pattern www vsm skf com 1 800 882 0008 43 Failure analysis Failure analysis Scotseal PlusXL Internal inspection Axial dirt lip and bumper lip wear patterns Axial Dirt Lip Axial Dirt Lip Pattern Pattern Bumper Lip Bumper Lip Wear Pattern Wear Pattern Good axial and bumper lip patterns Wide shiny When you examine the axial face you have
13. 013A HU OO9A HU O46A HU O42A HU O36A HU 034A HU 028A Oil Ale oop P Peer Aber 200 P ASAF 207 P PEdP Grease 21 5 6 301 G 202G Zee 304 G 259 G 401 G 456 G SKF Steel di 1703 di ag 1742 1743 1743 TES 1770 1790 1796 1798 1 Black design 2 Lexan design 3 Designed for P S I system Splashguard center plugs Available in green and black 4 packs Standard center plug Splashguard center plug Green 450434 4 450439 4 Black 453807 4 450438 4 Display 6 sets of each 454210 Display 12 sets green 454215 Display 12 sets black 454216 www vsm skf com 1 800 882 0008 Interchanges Tapered bearing sets Competitive interchange Components SKF Set No General bearing application Cone No Cup No BCA Set No Timken Set No SET401 R Drive Axle outer BR580 BR572 HD206 SET401 SET402 R Drive Axle outer Mack BR582 BR572 HD211 SET402 SET403 R Drive Axle inner 594 A 592 A HD203 SET4OS SET404 R Drive Axle inner Mack 598 A 592 A HD204 SET404 SET405 Trailer Axle inner amp Rear Drive Axle Trailer Axle outer BR663 BR653 HD207 SET405 SET406 FF Steer Axle outer BR3 82 BR3 20 HD205 SET406 SET407 Rear Axle inner amp Front Steer Axle outer BR28682 BR28622 HD213 SET407 SET408 L Drive Axle outer BR39590 BR39520 HD210 SET408 SET409 Front Steer Axle outer Mack BR45280 BR45220 HD219 SET409 SET410 Front Steer Axle inner BR45284 BR45220 N A SET410 SET411 L Drive Axle
14. 557 A Hs 749 AVP 710 BR42688 708 31281 43860 BR559 704 756 A 709 BR45284 700 31323 43865 462 BR560 706 BR758 711 BR45285 700 32470 43875 38747 BR567 707 BR759 712 BR47678 708 46390 38750 BR568 731 BR760 717 BR47686 710 435 47483 38780 BR575 708 BR776 715 BR47687 710 47690 48690 BR580 710 BR780 718 BR52400 718 47693 48794 463 BR582 710 BR3778 730 BR52401 718 47696 48796 2 438 BR593 Vaz BR3982 704 JH217249 719 LTO 48884 28758 BR594 715 BR3984 706 JM205149 A 1o2 47698 50124 28820 594 AVP 715 BR4595 701 JM207049 AVP 723 48000 28832 BR595 710 BR5557 721 JM511946 VP 724 448 BR596 711 BR5760 708 JM716649 719 436 38709 465 BR598 714 BR6379 705 JM718149 VP 713 34975 39988 43752 598 AVP 714 BR6386 706 JM719149 733 35000 43764 BR639 704 BR6389 706 HM212044VP 703 35060 449 43800 BR641 706 BR6461 708 HM212046 704 35066 47699 BR659 708 6461 AVP 708 HM212047VP 704 S507 2 473 BR663 710 BR6559 710 HM212049 XVP 706 35075 451 39380 663 A 710 BR6580 GAZ HM212049VP 706 35103 46305 w disc brks BR664 T32 BR28995 703 HM218248VP 713 46308 BR665 714 BR33281 716 HM518445VP 712 441 474 665 AVP 711 BR33287 707 H715345 VP 716 40086 452 52658 42623 42624 484 42631 44922 44964 45010 45099 45103 www vsm skf com 1 800 882 0008 SKF Scotseal PlusXL SKF Scotseal Classic SKF TF Hubcap SKF Spindle nut SKF Sleeve nuts wheel nuts Krown Products SKF Tapered bearing sets SKF Rebuild Kit for PreSet and lug locks SKF Brakemaster Air dryers Drivetrain kits U joi
15. NOT rock or rotate the hub drum assembly as an incorrect reading will result Wheel bearing end play is the total movement of the dial indicator 2 Female adapter mounting rod 3 Sliding swivel 4 Dial indicator mounting rod 5 Dial indicator f Bearing end play must be at least 001 of an inch and not greater than 003 of an inch Loctite is a registered trademark of Henkel All trade names referenced are the service mark trademark or registered trademark of the respective manufacturer www vsm skf com 1 800 882 0008 31 Disassembly Re assembly Wheel bearing end play verification Wheel bearing end play is the free movement of the wheel assembly along the spindle axis It is recommended for verifica tion purposes that wheel bearing end play be measured with a dial indicator Example in photo at right Step 1 Make sure the brake drum to hub fasteners are tightened to the manufacturers specifications Step 2 Attach a dial indicator with its magnetic base at the bottom of the hub or brake drum Step 3 Adjust the dial indicator so that its plunger or pointer is against the end of the spindle with Its line of action approximately parallel to the axis of the spindle NOTE For aluminum hubs attach the magnetic base of the Indicator to the end of the spindle with the plunger against the hub or brake drum Step 4 Set the dial indicator to zero by rotating the gauge face so the zero mark lines up with the gauge ne
16. nut 33 mm hex 70 ct box SKF unitized pinion seal reference chart SKF unitized Axles Position Arvin Meritor No National No Stemco No SKF DL SKF Grease Bore Yoke shaft 32500 14X 16X 18X 38X F R UI FUI A1205R2592 100494 429 0007 32305 32397 4 249 3 250 A11205X2728 30008 14X 16X F R UO FUO A1205P2590 100495 429 0005 30007 29867 3 751 000 A11205Y2729 30009 14X R R UI RUI A1205N2588 100263 429 0010 30153 30145 4 936 3000 A11205Z2730 32503 16X 18X R R UI RUI A1205Q2591 100557 429 0011 33254 5 5017 3250 A11205A2731 1 F R UI Forward Rear Unit Input FUI 2 F R UO Forward Rear Unit Output FUO 3 R RUI Rear Rear Unit Input RUI 58 1 800 882 0008 www vsm skf com Drive plates amp seal matchups Matchup of bearing cones amp centering plugs Table 1 Table 2 Drive plates appear in bold with matching seal Precisely matched centering plugs are engineered to fit within the inside diameter of the inner bearing numbers cone and allow accurate centering of the SKF Scotseal in the bore of the hub as well as preventing cocking of the seal 427 445 457 Bearing Centering Bearing Centering Bearing Centering 34387 39380 40040 cone no plug no cone no plug no cone no plug no 36285 39420 40136 KS EE 36358 39425 40139 36365 42550 495 AXVP 708 681 AVP 714 BR33895 701 426 2 461 BR497 711 BR683 715 BR39580 702 428 42800 45152 BR539 701 BR687 718 BR39581 702 21175 45160 555 S VP 702 BR749 719 BR39585 704 31244 446 45162
17. of the bearing cup Allow to cool for 15 minutes and remove DO NOT USE hydraulic press 1 800 882 0008 www vsm skf com Bearing Installation There are two main types of serviceable wheel hub assemblies manually adjusted and pre adjusted The re assembly Instructions are different for both so be sure to follow the correct procedure for each wheel end type The pre adjusted hub assembly such as ConMet s PreSet includes a spacer between the inner and outer bearings The bearings are specially tolerenced in order to achieve the targeted adjustment setting The specific installation instructions for PreSet are included in the SKF rebuild kit for PreSet and can also be found on line at www vsm skf com Care in handling components and proper tooling are always the critical factors in all procedures which lead to trouble free operation Bearing installation Bearing installation is handled differently depending on whether you are working with a ferrous hub or an aluminum hub With either hub never directly hammer on the bearing For ferrous hubs Use the SKF HD2 tool to install the bearing cups into the hub For aluminum hubs Heat the hub in boiling water or in an oven to no more than 300 F Do not use localized heat Chill the bearing cup in a freezer The hub will expand and the cup will contract Place the cup into the hub For oil lubricated wheel ends coat the bearing cones with a light oil film before i
18. piloted wheels Turn to a proven supplier for safety critical wheel end components The wheel end is critical to highway safety including the driver SKF M22 X 1 5 two piece wheel nuts available in 33mm and cargo and others traveling on the roads It s always best to trust 38mm OD fit most tractors and trailers a proven supplier with safety critical components with hub piloted wheels The SKF wheel nut is designed to provide increased clamp force while maintaining optimized torque tension reducing operating costs with extended life and improved fuel economy Benefits of the SKF two piece wheel nut include e Reduced potential for catastrophic e Provides increased clamp force while failure loosened wheel nuts can result maintaining optimum torque tension in wheel off conditions as well as e Extended nut life PTFE coating reduce the operating life of the wheel protects against corrosion and reduces ends seals and bearings friction e Reduced operating costs wheel nuts e DE first fit wheel nut on many effect overall tire life and wheel end life new production units ultimately reducing fuel usage and costs e Quality design and manufacturing manufactured to precise tolerances and meets the stringent requirements of SAE J1965 SKF recommends placing a small bead of oil on the end of each stud before installing the two piece wheel nut See the complete SKF two piece wheel nut part listing on page 57 15
19. two more wear patterns to learn If both lines are wide or polished clean then you should suspect that the seal has from About half way up on the face you should see a pencil line track from the been compressed This will happen if the I D of the seal isn t lubricated before axial lip and at the top edge a gently scuffed pattern from the bumper lip installation if the sleeve wasnt sealed fully on the spindle or if the bearing adjustment is too tight Hard contact Uneven patterns If the bumper lip path is shiny in one sector but dull in the opposite sector you can be sure the seal was cocked The bumper lip is making hard contact through half the revolution and almost no contact through the rest of it No contact 44 1 800 882 0008 www vsm skf com Inspection Bearing cup The most commonly damaged portion of the bearing cup is the tapered raceway surface inside the cup Make a careful inspec tion and look for the following e Evidence of corrosion e Metallic debris e Pitting of the surface e Metallic flakes e Any other signs of damage or foreign matter Severe sliding wear due to presence of hard Etching of metal generally indicates water abrasives contamination allowing oxidation to attack the surface Dent across the race indicates a sharp high impact Cup shows considerable corrosion This will develop Heavy grooving by large hard particles in the in spalling lubricant iv Mor rq
20. with washer slot tighten and torque SHCS locking system as indicated in step 9 If sight gage slot does not align with washer slot rotate nut clockwise until alignment occurs then tighten and torque SHCS locking system as indicated in step 9 9 When nut sight gage and lock washer slot alignment occurs the SHCS locking system can be torqued to a final reading of 10 13 ft lbs using a 9 64 hex bit socket for 1 50 12 and 1 50 16 and for all others use a 3 16 hex bit socket and the appropriate calibrated torque wrench Make sure heads of cap screws contact nut flange surface Hub should rotate freely after SHCS locking system is armed SHCS must be replaced with each and every removal of the wheel bearing lock nut system with a replacement cap screw and using Loctite threadlocker on the threads See Figure 5 for SHCS location 1 The following procedure can be used to verify end play a Make sure the brake drum to hub fasteners wheel lug nuts are tightened to the correct torque b Clean off all surfaces of the exposed axle end and the hub face c Setup gauging with similar equipment as shown in Figure 6 d Set the dial indicator to zero Gauge must be mounted to the hub and the indicator must be zeroed out on the spindle e Grasp the hub drum assembly at the 3 o clock and 1 Magnetic drive axle end plate the 9 oclock positions Push the assembly straight in then straight out while reading the indicator DO
21. A 386590A 380031A 380048A 380022A 380131A 380025A 386002A 380003A Stemco Guard G G wheel sets 308 0866 309 0935 372 7085 308 0863 382 8063 392 9036 392 9111 308 0836 382 8036 302 60 1 309 0915 392 9099 309 0912 392 7099 382 8039 302 As 382 8001 307 0713 ops de 307 0723 312 1099 309 0904 392 9112 392 2130 307 0744 SAO is 308 0864 382 8064 309 0965 72 7076 308 0853 962 6053 572 7083 309 0903 392 9094 308 0855 308 0856 382 8056 309 0964 392 9088 307 0743 572 7097 309 0973 67257104 309 0960 392 9081 392 9054 Stemco seal w ring 2164 1008 2728 1728 2057 1062 2721 1721 2133 1036 2057 1063 2702 1702 2036 1036 2216 1034 2102 1501 oon aA aA MA aMMr 2707 1707 2102 1501 2039 1038 2039 1011 2086 1013 2704 1704 2109 1507 2109 1013 2705 1705 2023 1503 2718 1705 2132 1515 2709 1709 2118 1510 ETENN 2137 1037 2713 1713 2114 1508 2708 1708 2706 1706 2129 1511 2710 1710 2710 1706 MMN 2712 1712 2113 1517 2701 1701 2110 1504 2110 1048 2703 1703 2106 1502 2717 1761 2009 1079 Stemco Voyager oa OE S dIE 560 0176 383 0156 sree Oar 27 ed ie 393 0112 2030192 283 0101 27 Ol 3720123 393 0104 373 0144 383 0164 3093 0153 322 0109 382 0156 3 3 0143 370 0176 393 0134 1 800 882 0008 www
22. A complete guide to trouble free operation of heavy duty bearings seals hubcaps lubricants and more DRY lt lt ui l UM mm i TROUBLE FREE OPERATION SS SS TUIN NW A systems approach to total wheel end maintenance SKF s Trouble Free Operation TFO Program is a proven Through our investigation of thousands of premature seal leaks systems approach to heavy duty maintenance By providing and or bearing failures we ve learned that improper removal fleets with detailed instructional materials and making and installation are by far the leading causes of these premature hands on training available to your technicians this program failures Armed with the right information and tools and using has made a significant contribution to many fleets overall the step by step procedures in this manual you can extend the productivity service life of bearings and seals protect your trucks from costly l d and mak fleet safer in th l This wheel end maintenance guide central to the TFO program ammage and Make YES AD MAA Se Is based on our core experience with bearings and seals over several decades and literally billions of over the road truck miles 2 WNeleemine e Asystems approach e Training ff e Extended warranties F e Seals j e Hubcaps e apered bearings e PreSet wheel ends f e Spindle nut locking system e Two piece wheel nut e Sleeve nut e Unitized pinion seal e Tools and acc
23. ETA TP trailer axle oilbath 4262 SET432 TP trailer axle grease 42627 Se SZ Application Thread size Outer tapered Hex socket bearing 6 point in in Steer Axle Meritor Navistar 1 50 12 Set406 2 Steer Axle Meritor Navistar 1 50 12 Set406 2 Steer Axle Meritor Eaton 1 50 18 Set406 2 Ford Steer Axle Meritor Eaton 1 50 18 Set406 2 Ford Drive Axle Meritor Eaton 2 625 12 BR3984 BR3920 3 Ford Navistar Set408 Drive Axle Meritor Eaton 2 625 12 BR3984 BR3920 3 Ford Navistar Set408 Trailer Axle Meritor Dana 2 625 16 Set413 5 Eaton Trailer Axle Meritor Dana 2 625 16 Set413 3 Eaton Drive Axle Meritor Dana 3 25 12 Set401 3 75 Eaton Mack Navistar Drive Axle Meritor Dana 325 12 Set401 375 Eaton Mack Navistar Trailer Axle Meritor Dana 3 48 12 Set415 4125 Freuhauf Hendrickson Trailer Axle Meritor Dana 3 48 12 Set415 4125 Freuhauf Hendrickson Trailer Axle Eaton 3 50 12 Set415 4 125 Trailer Axle Eaton 3 50 12 Set415 4 125 1 Also fits trailer axles for Meritor TR and Dana EST230 P amp P22TQ Axles before 1 1 2006 amp uses outer bearing SET415 Two piece wheel nut Part number MV33333 10 MV333336 100 MV33333B 300 MV22273 10 MV222736 130 MV88838 10 MV888386 80 Size M22 x 1 5 high profile M22 x 1 5 high profile M22 x 1 5 high profile M22 x 1 5 low profile M22 x 1 5 low profile M22 x 1 5 M22 x 1 5 www vsm skf com 1 800 882 0008 Outside diameter 33 mm hex 33 mm hex 33 mm hex 33 m
24. Never use an impact wrench when tightening or loosening lug nuts or bolts during the procedure Back off Step 1 200 300 lb ft 271 407 N m Initial adjusting si PUE OTUR Initial back off adjusting nut EE Threads Final NEE Torque Acceptable end play perinch back off specifications Step 2 Step3 ss Step4 Step5 Step6 Step7 Step8 Install cotter pin to lock Steer front axle nut in position 0 001 in 0 005 in non drive ve este EE AE 0 025 mm 0 127 mm 200 lb ft Er 21uM 66 7 mm 271 407 N m 271 N a a rotating rotating Drive Turn E 5 Ib m As measured per indicator Turn 2 s in 66 7 mm Trailer 16 See 1 If dowel pin and washer or washer tang and nut flat are not aligned remove the washer turn it over and reinstall If required loosen the inner adjusting nut just enough for alignment Bendable type washer lock only Secure nuts by bending one wheel nut washer tang over the inner and outer nut Bend the tangs over the closest flat perpendic ular to the tang Printed with permission of the TMC Reference RP618A 2 PreSet wheel bearing adjustment procedure ConMet PreSet hub assemblies are equipped with specially half toleranced bearings and a spacer and require a specific bearing adjustment procedure Use the OEM seal Scotseal PlusXL when servicing a PreSet hub assembly 1 Lubricate the wheel bearing with clean axle lubricant of the same
25. RBT10429 LBT10429 SET428 NP874005 NP435398 Outer FF front SET429 107502 RBT10434 LBT10434 SEE NPO34946 NP363298 Inner R drive SET430 107503 RBT10431 LBT10431 SET430 NP840302 NP053874 Outer R drive SET431 107504 RBT10430 LBT10430 SET431 NP965350 NP503727 Inner TN trailer SET432 107506 RBT10426 LBT10426 ETA NP1 74964 NEE SEEN Inner Outer TP trailer LMS half stand interchanges SET427 107500 RBT1 0433 LBT1 0433 SET433 NE431952 NP378092 Inner FF front SET427 107500 RBT1 0433 LBT1 0433 SET433 NP431952 NP378092 Outer TN trailer SET428 107501 RBT1 0429 LBT1 0429 SET434 NP555065 NP720703 Outer FF front SET429 107502 RBT1 0434 LBT1 0434 SETA DS NP588900 NP107783 Inner R drive SET430 107503 RBT1 0431 LBT1 0431 SET 3 NP577914 NE275161 Outer R drive SET431 107504 RBT1 0430 LBT1 0430 SET437 NPO22333 NP250023 Inner TN trailer SET432 107506 RBT1 0426 LBT1 0426 SET438 NP417549 NP15682 Inner Outer TP trailer 56 1 800 882 0008 www vsm skf com Rebuild kit for PreSet Rebuild kit part number FFSK1 RDSK1 TNSK1 TNSK2 TPSK1 TPSK2 Position Spindle nut locking system Part number SN1I50CWFF SN1I50CWFFG 45 SN1I50FWFE SN1I50FWFEG 45 SN262GWDA SN262GWDAG 25 SN262KWTN SN262KWTNG 25 SN325GWDT SN325GWDTG 20 SN348GWTP SN348GWTPG 20 SN350GWTA SN350GWTAG 20 Scotseal Plus XL Inner half stand bearing FF steer axle 35058 SET427 R drive axle long and short haul 47691 Sea TN trailer axle oilbath 46300 SET431 TN trailer axle grease 46300
26. an be caused by not bottoming out the seal properly leaving it cocked in the bore or installing the wrong part number Severely damaged I D Scratches or dents in the I D are signs that the seal has struck the spindle or axle tube during installation Rushing the installation and not lining up the wheel dolly Is the usual suspect Or a rough shop floor may be the problem Foreign matter on I D Occasionally you will come across a seal with a shaft leak that has a mysterious tacky substance on it Most likely someone added a silicone sealant to improve the seal Old habits die hard 38 Installed backwards The only way that the packing can be worn shiny as shown here is by rubbing against the bearing race The only way that can happen is by putting the seal in backwards Distorted packing One way to damage the packing of a Scotseal is to try to install it over a wear ring The wear ring will deform the inner surface and ruin the seal Any previously installed wear ring must be removed prior to installing a Scotseal Reference the Scotseal installation wall poster 457626 as a convenient seal and bearing installation guide 1 800 882 0008 www vsm skf com Scotseal Classic Scotseal Longlife zs L hes Ps B Oa SE t ash SEE PR es 2 SR BAR q 3 J GE GF Ld tl d J UV af ged Vas gt U w d d ie A i AE Ti N N G K N N N 1 1 Use pliers or end cutters and work
27. ch up of bearing cones and centering plugs see Table 2 on page 59 Watch the Scotseal Classic installation video www vsm skf com 1 800 882 0008 27 Disassembly Re assembly Installing hub assembly 1 28 When installing the hub assembly over the axle spindle be sure to align the hub bore to the center of the spindle Mechanical supports will allow you to do this without scraping or otherwise damaging the spindle the threads and in particular the seal Install the outer bearing cone and adjusting nut Tighten nut only until it is snug against the bearing cone DO NOT USE A PNEUMATIC TOOL during this part of the proce dure Be sure to maintain support of the hub assembly until the adjusting nut is secure Failure to do so may cause damage to the seal and subsequent leakage of lubricant Remove the hub support so that the hub Is resting on the bearings Check for free rotation of the bearings Never allow hub to rest on seal Follow wheal bearing adjustment as instructed on following page WARNING Do not attempt to install the hub assembly by hand Whether the hub is with or without the tire do not install it without mechanical support Axle spindle shaft 1 800 882 0008 www vsm skf com Wheel bearing and end play adjustment procedures Wheel bearing adjustment procedure Lubricate the wheel bearing with clean axle lubricant of the same type used in the axle sump or hub assembly Note
28. e When installing a Scotseal Classic or Longlife seal it is important to use the proper installation tool to set the seal correctly into the hub The SKF installation tool is specifically contoured to fit the profile of the seal Refer to the seal installation tool charts on the following page Caution Do not install the Scotseal directly onto the spindle Place the hub wheel assembly against a solid surface or bench at a 45 angle for seal installation This aids in centering the bearing and seal in the hub bore Clean bore of any particles rust or grease 1 Pre lube the inner bearing cone with the lubricant that is being retained and place It into the hub Place the Scotseal Classic or Scotseal Longlife into the hub bore and insert the tool assembly with centering plug into the seal Note Be sure to wear proper eye protection strokes until the seal is squarely seated Continue driving the seal into the hub until the sound of impact changes After the seal is bottomed in the bore check for freedom of movement by manually moving the packing of the seal up and down Ensure that the inner bearing rotates freely 3 Hold the tool handle firmly and straight and drive the seal with firm hammer Caution Install a new seal if the seal is cocked or damaged during or after installation For detailed information about the Scotseal Installation tool see pages 18 19 For drive plates and seal match ups see Table 1 on page 59 For mat
29. eals and bearings Cloud free window is fusion bonded to body no screws to shake loose and no leaking Molded pressure ridge on flange bites into sealing gasket to ensure leak proof fit Elongated bolt holes accommodate multiple bolt circle patterns Slotted bolt hole gasket Multiple labyrinth prevents contaminants from reaching wheel end Hard shell resists power washing road debris SKF Splashguard Upgraded vent system and protection SKF Splashguard technology is a contaminant exclusion system that provides extra splash protec tion The Splashguard protects the wheel end from water ingestion caused by high pressure washer spray and submersion Side tabs allow for easy removal Extended surface Pressure sensitive vent adds coverage between window vent closed unless releasing pressure plug for better sealing eliminates entry path for contaminants 8 1 800 882 0008 www vsm skf com Tamper Proof Scotseal TF for g rease packed Umbrella valve vents pressure even when covered with 1 4 inch grease splash plate provides extra ap p i cati ons protection against power washers Designed for today s grease packed systems the Tamper Proof Scotseal TF Hubcap features a patented umbrella style valve that seals contamination out yet vents internal pressure as low as 2 P S I The addition of a splash plate to the hubcap design helps protect against the harsh condi
30. ed on the hubcap Install side fill hubcap plug per the following recommended torque values 3 8 18 NPT Pipe Plug 100 140 Ibs in 3 4 16 UNF Zytel Side Fill Plug 15 25 lbs in Clean up any overspills that would give the appearance of a leaky hubcap Grease fill See TMC RP631 Recommendations for Wheel End Lubrication and the vehicle manufacturer s recommendation for proper fill procedure 33 Disassembly Re assembly TFO Good practice tips Our experience has shown that there are many causes of wheel end leakage beyond the oil seal If you look you will find that leaking wheel ends leave clues pointing to which component or components are the culprits Follow the guidelines of the checklist below as you service the wheel end You may find that just changing the seal may not be your perma nent solution To prevent wheel end leakage problems be a good detective Inspect for imdications of leakage Under vehicle inspection e Oil present past the seal e Dil contaminated hub brake hard ware brake shoes External leakage e Oil present around hubcap in wheel cavity e Oil present around axle flange drive axle Disassembling the wheel end Caution Block wheels support vehicle on stands e Check condition of hubcap Check flange window and centerfill plug e Check bolts and axle flange area on drive axle 34 Remove hubcap Axle flange on drive axle Check conditi
31. edle For digital indicators push the zero out button Bearing life chart Printed with permission of the TMC Reference RP618 Step 5 Grasp the wheel assembly at the 3 o clock and 9 o clock positions while oscillating it to seat the bearings Read bearing end play as the total indicator movement Increasing life NOTE If end play is not within specifications refer to the readjustment procedure on page 29 Clearance range 0 001 to 0 005 0 008 0 004 0 0 004 0 008 0 012 0 016 Wheel end setting E Bearing life TMC endplay 32 1 800 882 0008 www vsm skf com Hubcap installation procedure Procedure 1 Hub mating surface must be free of dirt burrs and radial score lines 2 Hub mating surface hubcap flange and gasket should not be greased or oiled 3 Always install and re install a hubcap with a new gasket 4 When using a Tamper Proof system with synthetic grease never fill hubcap with grease Bolt on hubcaps e Use the plated SEMS bolts included with the TF Zytel hubcaps The pre assembled washers bite into the flange and protect the wheel end from exposure to contaminants e Use grade 5 bolts for the steel hubcaps with conical or internal toothed washers Do not use flat washers e Thread all bolts loosely then tighten down bolts uniformly ina star pattern per the following recommended torque values TF Zytel Hubcap with embedded metal ring 12 16 lbs ft Stamped Steel Hubcaps 10 14 lb
32. eefer units and rollers air tanks relay valves slack adjusters and pins Other Krown products Krown Salt Eliminator is a very unique equipment saving protection product that makes the difficult task of salt removal easy This proprietary formula tion not only dissolves salt much more quickly but also breaks the bond between chloride and metal while preventing the reforming of these salts after cleaning Is complete www vsm skf com 1 800 882 0008 Krown Fast Acting Penetrant will rapidly penetrate and loosen seized and rusted parts This product is a solvent free penetrant which means the product remains on surfaces lubricating and protecting from rust Exterior e Swing doors Roll up doors e Tailgate ends Sockets e Liftgate wiring and hardware Krown Chain Lubricant is a solvent free product designed to substantially enhance chain life while reducing wear and friction Safe for self lubricating chain it will reduce corrosion and help to keep debris from sticking and causing costly repair and downtime Engineered for high heat applications 21 Disassembly Re assembly Wheel end Inspection and maintenance It is important to inspect a vehicles wheel ends periodically for www vsm skf com After inspection you may determine safety and to maximize over the road performance SKF that a wheel end repair is necessary recommends inspecting wheel ends every 100 000 miles or de t t
33. es the SKF Scotseal PlusXL one of the most advanced wheel seals in the industry It also includes tighter toleranced bearing sets an SKF TF hubcap if applicable and a precision machined PreSet bearing spacer With parts that meet the exact specifications of the original PreSet system components the SKF rebuild kit helps ensure longer service life and less downtime Plus a simplified installation procedure saves time SKF Scotseal PlusXL SKF half stand tapered SKF TF hubcap bearing sets 2 when applicable Featuring precision machined PreSet spacer e Proprietary machined bearing spacer along with the SKF specifically toleranced bearings provides the most reliable bearing end play setting optimizing wheel end life e Eliminates need for manual end play adjustment 12 1 800 882 0008 www vsm skf com sbuild kit for Pre5set Why install the kit instead of off the shelf components While you could pull the spacer and rebuild your PreSet wheel end with individual components from several suppliers there are some compelling reasons to install the SKF rebuild kit for PreSet Reduce fleet downtime Unlike off the shelf components all of the kits parts are manufactured to SKF s and ConMet s specifications ultimately reducing downtime and lowering operating costs Simpler installation One procedure regardless of axle type eliminating potential failures due to error no need for compli cated torqui
34. essories e Krown 22 e Seals e Bearings e Spindle nuts e Hubcaps e Lubrication 36 e Seals e Bearings e Hubcaps 54 GEEL e Scotseal family e Hubcaps e Tapered bearings e Half stand bearings e PreSet kits e Spindle nut locking system e Two piece wheel nut e Sleeve nut e Unitized pinion seal About TFO SKF TFO training O i ae i Providing access to SKF knowledge SKF s Trouble Free Operation TFO Program offers a proven systems approach to heavy duty maintenance By providing detailed instructional materials and hands on training to fleets and distributors alike the TFO program has helped improve the overall productivity of both The TFO program recognizes that there are many ways to develop skills learn about new products and procedures and determine best practices for safe efficient mainte nance While eLearning and technical manuals are important nothing complements them better than a face to face training session with a technical expert With the TFO program SKF provides such on site technical training for counterpeople as well as technicians and installers hese hands on training sessions offer an invaluable resource for learning about SKF heavy duty products and services To request an on site training session contact your local SKF sales representative Mi UR ss E id EO Sales Pro Z SS TROUBLE FREE OPERATION SE IN This certificate acknowledges that
35. ge the seal e Whenever possible use a grease packer www vsm skf com 1 800 882 0008 Grease and oil lubricants The truck or trailer manufacturer has pre determined that the wheel end assembly Is to be lubricated by grease or oil The importance of following the manufacturer s specifications cannot be over emphasized never change or mix grease and oil in the same assembly Always use lubricants as recommended by the manufacturer Lube on the brakes Hardening or destruction of seal lip Lube leakage BRAKES Typical mechanical grease packer Grease lubricated wheel ends Wheel end lubricants are formulated to match the requirements of the truck and bearing manufacturer e Always use specified lubricant e Do not mix lubricants e Chemical interaction between lubri cants and seal materials can damage the seal e Whenever possible use a grease packer Higher temperatures Lube deterioration BEARINGS di f Hot running causes physical damage 35 Failure analysis Failure analysis An important step in achieving wheel end TFO Failure analysis of prematurely failed seals is one of the best means to discover the cause of failure and to avoid a similar fate for the replacement seal The cross sectional drawings at right illustrate the critical components of each member of the Scotseal family The captions Identify these components as described in the follow I
36. lugs are engineered to fit within the inside diameter of the inner bearing cone and allow accurate centering of the Scotseal in the bore of the hub as well as preventing cocking of the seal See page 59 for a complete listing of drive plates and centering plugs Standard plug Washer bushing Standard tool handle 450237 N Seal drive plate Centering plug Nut These components are interchangeable See Table 1 on page 59 The Scotseal toolboard e Keeps tools orderly and lessens chances of tools being misplaced or damaged e Sturdy metal construction mounts easily on shop wall e Fitting chart included e Just order Part No TB 2 18 1 800 882 0008 www vsm skf com SKF SRT 1 Seal Removal Tool Universal bearing cup installer The SKF SRT 1 Seal Removal Tool is recommended for removal The universal bearing cup installer HD1 from SKF is a three of most tractor truck dolly or trailer wheel seals With the wheel jaw system that provides evenly distributed pressure eliminat hub assembly removed from the axle simply insert the hooktip ing cocked installations of the tool between the seal and bearing e Saves bearings tool grabs seal only and bearings go undamaged e Seal is removed intact allowing for proper seal Inspection and failure analysis if required e Works with steer drive and trailer wheel seals www vsm skf com 1 800 882 0008 19 Product overview Krown Fast
37. m hex 33 mm hex 38 mm hex 38 mm hex Number of pieces in container 10 ct box 100 ct box Outer half stand bearing Hubcap Spacer SET428 1612 103392 SET430 N A 103593 SET42 1643 104144 SET427 1343 104144 SET432 1696 104412 ENE 1399 104412 Hardened washer Notes Stemco not sold separately interchange 150CWBW Bag of 1 448 4836 150CWBW Carton of 45 pcs 448 4836 150CWBW Bag of 1 448 4837 150CWBW Carton of 45 pcs 448 4837 262KWBW Bag of 1 449 4974 262KWBW Carton of 25 pcs 449 4974 262KWBW Bag of 1 447 4743 262KWBW Carton of 25 pcs 447 4743 325GWBW Bag of 1 449 4973 325GWBW Carton of 20 pcs 449 4973 350GWBW Bag of 1 447 4723 350GWBW Carton of 20 pcs 447 4723 350GWBW Bag of 1 447 4724 350GWBW Carton of 20 pcs 447 4724 300 ct bucket 10 ct box 130 ct box 10 ct box 80 ct box Metform Securex part number OE 37702 39702 39874 39874 39514 39514 57 Interchanges Sleeve nut Part number Size Outside diameter Number of pieces in container SLN22006 10 M22 1 5 x 6 mm sleeve nut 33 mm hex 10 ct box SLN220066 100 M22 1 5 x 6 mm sleeve nut 33 mm hex 100 ct box SLN22195 10 M22 1 5 x 19 5 mm sleeve nut 33 mm hex 10 ct box SLN221956 70 M22 1 5 x 19 5 mm sleeve nut 33 mm hex 70 ct box SLN22280 10 M22 1 5 x 28 mm sleeve nut 33 mm hex 10 ct box SLN22280G 70 M22 1 5 x 28 mm sleeve nut 33 mm hex 70 ct box SLN22395 10 M22 1 5 x 39 5 mm sleeve nut 33 mm hex 10 ct box SLN223956 70 M22 1 5 x 39 5 mm sleeve
38. ned herein PUB 457975 July 2015 Certain image s used under license from Shutterstock com
39. ng and use of a dial indicator See the complete Rebuild kit for PreSet part listing on page 57 www vsm skf com 1 800 882 0008 Extended 3 year warranty In addition by installing the ConMet approved SKF rebuild kit for PreSet you will receive an extended 3 year warranty on these SKF wheel end components Longer service life Because the kit meets the exact specifica tions of the original PreSet system components you can expect the same kind of reliability and performance from your rebuilt wheel end 13 Product overview SKF Spindle nut locking system The SKF spindle nut locking system offers a new robust and affordable lock nut system for tractors and trailers alike Forged precision machined and assem bled with two high strength lock bolts the SKF spindle nut locking system yields one of the strongest systems available today Coupled with the precision stamped lock washer this system provides the user with end play adjustability that exceeds the stringent demand of today s field environment and maintenance requirements This system is intuitively easy to install and service and requires no special tools The SKF spindle locking nut Is now available in steering drive and trailer sizes Hardened washer Wheel bearing lock nut m See the complete SKF Spindle nut locking system part listing on page 57 14 1 800 882 0008 www vsm skf com SKF two piece wheel nut for hub
40. ng pages For Scotseal PlusXL failures most likely result from these common errors e Improper installation 0 D and or I D not lubed e Lube contamination e Spindle not fully prepped e Use of a hammer NOTE replacing a narrow footed seal like the Scotseal Classic and Scotseal Longlife requires cleaning the spindle along the new area where the wider Scotseal PlusXL will sit Below are the key failure modes for Scotseal Classic and Scotseal Longlife These account for the lions share of prema ture seal failures e Improper installation Wrong or no tool used e Cocked installation e Lubricant contamination Metal flakes Dirt or water Mixing of lube types e Improper bearing adjustment e Seal spinning on spindle Damaged spindle e Hub imperfections e Installed over a wear ring Consult the following pages for examples of failure analysis 36 Scotseal PlusXL OD Beads Bumper Lip Axial Dirt Lip Radial Dirt Lip ID Beads Bore Tite Coating Leak Primary Sealing Lip Dirt Lip Bumper Lip 1 800 882 0008 www vsm skf com Scotseal Classic Scotseal Longlife External inspection outer diameter Normal scuffing 0 D radial grooves The surface will show some scraped areas thats normal But signs of nicks If the Bore Tite film has been scored all the way across the width of the seal you scratches metal particles or any foreign material are warning flags tha
41. nserting them into the hub Always use the same lubricant being retained in the hub Do not mix lubricants Install the Inner bearing cone Into the hub www vsm skf com 1 800 882 0008 25 Disassembly Re assembly Seal installation Scotseal PlusXL This seal is hand installable No special tools are required Caution Do not install the Scotseal PlusXL directly onto the spindle Place the hub wheel assembly flat or at least a 45 angle for seal installation Clean bore of any particles rust or grease 1 Pre lube the inner bearing cone with the lubricant that is being retained and place it into the hub 2 Lightly lubricate the seal O D and D evenly with the fluid that is being retained Also apply a thin layer of oil on the hub bore that the seal is being pressed into NEVER INSTALL DRY 3 Press the seal by hand evenly into the bore A rubber mallet or other soft faced tool may be used to gently tap the seal into place Be sure that the seal is evenly seated and bottomed in the bore As in any seal installation apply an even driving force to avoid cocking the seal or damag ing the flange surface 4 Allow seal to set for about 5 minutes prior to installing hub assembly onto spindle Caution Install a new seal if the seal is cocked or damaged during or after installation A rubber mallet may be used to tap into place 26 1 800 882 0008 www vsm skf com Scotseal Classic Scotseal Longlif
42. nspect the spindle and spindle threads for damage and remove light frett Also check for the following e Spalling e Corrosion pits e Discoloration from overheating e Punch marks chisel marks e Weld beads e Upset metal n G SH o NOTE Damaged threads can be repaired using a pitch thread file or die nut Inspect the fastener Locknut Bearing adjustment nut Washer The use of these spindle end components varies by truck or trailer manufacturer See illustrations below of the various nut systems you may encounter Look for chisel marks or other deformation as a sign of improper installation or an attempt to make temporary repairs Standard nut system Stamped nut system Castle nut system Double nut pack system Inner spindle nut Locking spindle washer Retai Washer etainer Y retaining SS washer Cotter pin EA 9 i Castle N N Steering knuckle nut S j spindle Y O Do AS retaining washer Dowel QO ia Jam nut or a Adjusting nut Outer spindle nut Stamped locking nut To learn about the one piece SKF spindle nut locking system see page 14 Inspect the inside and the outside of the hub Look for the following e Broken fasteners bolts e Cracks in the housing e Damage to the hub and bore NOTE If the bearing cup is loose in the hub this indicates a serious condition and the hub must be replaced Disassembly Re assembly Seal and bearing removal
43. nts Automotive wheel hub units SKF offers a complete line of heavy duty aftermarket products designed to keep your fleet moving and your drivers safe Turn to SKF for safe and reliable wheel end solutions by accessing product information and technical tips through one of these outlets vsm skf com Download literature access technical tips and view product information Youtube View detailed technical and product videos at skfpartsinfo tv Mobile parts look up Access our mobile parts look up website for all the latest part numbers at skfpartsinfo com Twitter Follow us on Twitter skfpartsinfo to stay on top of all the latest technical and product information SKF Parts Info Apps Download SKF apps for access to product information cross reference instruction sheets application data and brochures skf com vsm skf com 1 800 882 0008 SKF BeyondZero TFO TF Scotseal Waveseal Bore Tite are registered trademarks of the SKF Group ConMet and PreSet are registered trademarks of Consolidated Metco Inc SKF Group 2015 The contents of this publication are the copyright of the publisher and may not be reproduced even extracts unless prior written permission is granted Every care has been taken to ensure the accuracy of the information contained in this publication but no liability can be accepted for any loss or damage whether direct indirect or consequential arising out of the use of the information contai
44. on of lube e Cloudy or milky indicates water e Shiny indicates bearing wear e Metal flakes present could indicate loose shavings from an axle component e Grit and sand indicates lube contamination e Smells burnt indicates overheating Check condition of fastening system e Verify end play measurement before removing fastener e Examine outer nut washer dowel tang or D type inner nut cotter pin look for clues Remove outer bearing e Inspect for signs of damage Remove wheel or hub assembly using a wheel dolly Check spindle e Threads damaged e Chamfer damaged Set bearings aside for inspection Remove seal e Check hub e Condition of chamfer e Nicks burrs damage e Consult the Failure Analysis section of the User s Manual 1 800 882 0008 www vsm skf com The importance of proper lubricants Running conditions Road surface weather terrain speed and load Inspection of lubricant Inspection of grease or oil can provide a clue to other problems Remove a sample from the wheel end and check for the following e Presence of contaminants e Burnt aroma e Presence of water Prior to re installing bearings always check for the proper lubricant Wheel end lubricants are formulated to match the requirements of the truck and bearing manufacturer e Always use specified lubricant e Do not mix lubricants e Chemical interaction between lubri cants and seal materials can dama
45. pected wheel end failures that can cause vehicle downtime and damage serious personal Injury and even fatalities www vsm skf com 1 800 882 0008 5 Product overview SKF Scotseal wheel seals the right sealing solution for every application Scotseal PlusXL The Scotseal PlusXL a rubber unitized one piece design offers maximum sealing life under virtually all driving conditions The high temperature synthetic lubricant friendly material of the Scotseal PlusXL provides heat resistance up to 300 F and is an excellent choice for frequent braking applications e Fat footprint with adhesive type properties locks onto spindle making a perfect seal even on worn spindles e No tools Just lube ID and OD and press into hub Avoids costly do overs AIR SIDE gt Bumper Lip Spring OIL amp Axial BEARING Dirt Lip lt SIDE Radial Dirt Lip Primary Sealing Lip EET ID Beads SHAFT The Scotseal PlusXL consists of four sealing lips a spring loaded primary sealing lip with patented Waveseal design that is factory pre lubed a radial and axial dirt lip plus an outer bumper lip that acts as a preliminary dirt excluder e Specially formulated material and robust design e Longer life in contaminated conditions e High temperature capabilities to 300 F e Tested and compatible with all popular synthetic lubricants e Unitized design provides fresh running surface for sealing lips and keeps ou
46. r discoloration If the edge has a rippled look chances are it has started to melt from excessive heat Heat build up could be from running low on lube excessive pre load on bearing or a recent switch to an incompatible lubricant Warped Flange Place hubcap on a flat surface When flange is distorted it will not hold contact all the way around Proper torque specifications may not have been followed 52 1 800 882 0008 www vsm skf com www vsm skf com 1 800 882 0008 53 Interchanges Scotseal family interchanges Scotseal PlusXL 23590 28759 29400 34384 34971 34994 35058 38776 39426 39979 w 456301 40091 40129 42627 42673 43754 43761 44916 45093 45095 45157 46300 47691 47692 48002 1 Guard Guardian HP G G Grit Guard Scotseal Classic 28758 34387 34975 35000 35066 36358 36365 38750 38780 39988 w 455031 40086 40136 42623 42672 43752 43764 43860 44922 44964 45010 45099 45103 45160 46305 47697 48000 48690 2 Use to depletion and reorder 47691 54 National 370199A 370150A 370211A 370047A 3 01324 370169A 370001A 370011A 370024A 370023A 370033A w AR 12 370066A 370349A 370036A 370065A 376590A 370031A 370338A 370037A 370182A 370048A 370019A 370124A 370178A 370022A 370131A 370021A 370025A 370003A 370005A 3 01 3A 370195A National 5 Star 380001A 380023A 380036A 380065
47. re of the roller bodies to deform the surface of the race Other damage Fretting corrosion of the outer surface is often the result of a worn hub or spindle Light pitting can be caused by electrical arcing The probable cause is electrical welding grounded through the shaft Spalling the wearing away of metal from the bearing surface the result of contamination brinelling improper installation improper lubrication or the normal end of bearing life www vsm skf com 1 800 882 0008 51 Failure analysis for bearings Inspection of lubricant and hub cap The hub cap is constantly exposed to the environment That means hot cold wet dry and salty But some of it s roughest treatment can come from inside A lack of lube or an over tight bearing adjustment can cook the hub cap and permanently damage it Here are a few of the clues to indicate why a hub cap has failed Distorted bolt hole Milky window Bolt hole or flange distortion may be the result of excessive bolt torque during The view window in the hub cap will become nearly opaque white when subject to installation The use of an impact wrench may damage the flange at the bolt hole heat The heat comes from inside and spells trouble You ll want to pull the wheel area during assembly and check the bearing adjustment check for low lube or a change to an incompatible lubricant Melted window With the hub cap removed inspect the edges of the view window for damage o
48. s Primary Lip Wear Pattern Dirt Lip Wear Pattern Contamination Being Excluded Primary Lip Wear Pattern Dirt Lip Wear Pattern Good pattern What you will see in a good Scotseal are the two parallel lines that look like they ve been drawn with a sharp pencil They re approximately the same size and equidistant from the edge all the way around the inside of the outer cup Wide wide If both lines are wider than pencil lines it means that the primary lip and dirt lip have been allowed to move in and out on the outer cup The cause of this IS excessive end play indicating that the bearing end play is greater than the recommended range of 001 and 005 Metal shavings in lip area Cocked seal inner markings Before cleaning the seal inspect the seal area for traces of metal particles A Holding the outer cup just below eye level and flat like a bowl rotate your wrist magnet can attract metal particles Sharp edges of metal may have cut the seal through 360 If the seal has run cocked the two lines will be parallel to each primary lip causing the seal to leak other but they appear to move closer and then farther from the outer cup flange 40 1 800 882 0008 www vsm skf com Normal exterior The tough nitrile covering on the Scotseal PlusXL doesnt supply clues as readily as Bore Tite does But it can still reveal problems and lead to corrective measures There should be lubrication in each of the O D
49. s ft Plastic Hubcap with external metal ring 6 10 Ibs ft Threaded hubcaps e Lightly lubricate the threads of the hubcap and the O ring with the lubricant that is being retained e Install the O ring onto the hubcap e Install the hubcap assembly onto the hub e Using an 8 point 4 13 16 opening x 4 1 4 high socket torque to the following recommended values Lexan 50 60 lbs ft Note Do not use sol vent based cleaners on Lexan hubcaps www vsm skf com 1 800 882 0008 Oil fill Through center fill port e Fill wheel end assembly through centerfill port with the specified grade of oil Wheel hub configura tions vary allowing different amounts of oil to be added depend Ing on design Allow for the oil to seep through the outer bearing and fill the hub cavity Continue to add oil until the oil reaches the oil level fill line as indicated on the hubcap e Install center fill hubcap plug Through side fill port e Fill wheel end assembly through side fill port with the speci fied grade of oil Wheel hub configurations vary allowing different amounts of oil to be added depending on design Allow for the oil to seep through the outer bearing and fill the hub cavity During this fill operation DO NOT ALLOW THE OIL TO GO ABOVE THE CENTERLINE OR WEEP HOLE This may result in a weeping condition that may be perceived as a leaking hubcap Continue to add oil until the oil reaches the oil level line as indicat
50. s or Tractor 100 000 miles 150 000 miles 300 000 miles 1 year 2 years 3 years Severe 1 year or 1 year or 1 year or Service 50 000 miles 100 000 miles 150 000 miles The following conditions are required for Aftermarket warranty coverage under the TFO program e SKF hubcaps must be used e Coverage applies to genuine SKF Scotseals and hubcaps only e User must follow current TMC maintenance procedures e SKF representative to conduct training at each fleet maintenance facility e Wheel end maintenance records are to be monitored by SKF and fleet NOTE For further details on the warranty program including extended OE warranties contact your local SKF representative Caution Beware of counterfeit seals Unscrupulous manufacturers are flooding the global market with A few words of caution poorly engineered and cheaply manufactured seals that have deliberately been made to resemble premium quality SKF Scot seals Most obvious is the use of green paint not Bore Tite that can flake off and enter the hub actually causing bearing damage The warranties detailed above apply only to genuine SKF brand e Testing has shown these counterfeit seals to be of substantially Scotseals inferior quality and highly questionable reliability e A seals running surfaces are critical to performance Historically the running surfaces of counterfeit seals have been demon strated to be well below SAE standards e Premature seal failure can lead to unex
51. sure to wear gloves or use a shop rag to protect your hands The opened flange is extremely sharp Pull the two components apart Then set the sleeve assembly aside the top component shown above Place it carefully where it is out of the way but won t be disturbed Internal inspection sealing lip condition 7 3 na ir fe i T ad G d tf E Atai N r n y tig e Factory Applied Grease ie Check for grease Locate the primary sealing lip and radial dirt lip If the area between them is dry something has allowed oil to wash away the grease The cause could be excessive end play or a cocked seal Or internal pressure from a blocked vent Cracked lips If when you check the primary and dirt lips the nitrile feels rough and dry it has probably been subjected to excessive heat Loss of lubrication and overtightened bearing adjustment are the prime suspects 42 Normal lip flexibility Check the primary sealing lip and dirt lips by pressing downward on them with your thumbs sliding them around the entire circumference The rubber should remain soft and flexible in normal use AN Damaged JE AL ukg _ Normal Flattened bumper lip Scale or rust on the spindle will prevent the wider Scotseal PlusXL from sealing properly This creates extra pressure on the bumper and axial dirt lips The spindle must be fully cleaned and all wear rings removed before installing a Scotseal PlusXL 1 800 882
52. t road contaminants extending service intervals 1 800 882 0008 www vsm skf com Scotseal Classic With literally trillions of road miles to its credit Scotseal Classic has proven to be a solid choice for dependable long lasting service When properly installed using SKF tools and proce dures Scotseal Classic is a reliable performer for meeting the sealing requirements between brake maintenance intervals e Coated with Bore Tite which provides a better seal than a simple metal to metal press fit e Unitized design provides a perfect running surface for the three sealing lips preventing oil leaks and contamination Ingress e Reliable seal designed to provide long lasting service and dependability HUB BORE Primary Sealing Lip Bore Tite Coating OIL amp BEARING lt SIDE Spring AIR Packing re SIDE gt Dirt Lip Bumper Lip SKF Scotseal Classic is a unitized one piece design consisting of a sealing element packing that is assembled between a metal outer and inner case The packing consists of three sealing lips a spring loaded primary sealing lip that is factory pre lubed a dirt exclusion lip and an outer bumper lip that acts as a prelimi nary dirt excluder See the complete Scotseal interchange chart on page 54 www vsm skf com 1 800 882 0008 Scotseal Longlife Building upon the successful one piece multi lip design of the Scotseal Classic the Scotseal Longlife is designed
53. t should inspect the hub for burrs or damage Before installation the hub should something else is amiss Make sure the hub bore is smooth and free of burrs or be inspected and cleaned with emery cloth or a fine file nicks Lines in the Bore Tite As you can see in this example the grooves run from high on the left to low on the If you see lines around the seal several things could have happened If the lines right indicating a cocked installation Most likely the seal was not properly are etched to the metal the seal could have spun as a result of being the wrong bottomed out or a centering tool was not used common causes of application or more likely it was installed crooked or cocked premature seal failure Shiny leading edge Outer cup damage Occasionally someone will try to improve seal installation by changing the shape If you see dents nicks or a bent casing you can bet that the seal was installed of the seal They ll round off the leading edge of the outer cup on a grinder This without the proper tool or the tool was damaged Gashes indicate the use of a distorts the outer diameter and can possibly cause the seal to disassemble sharp object like a screwdriver or punch www vsm skf com 1 800 882 0008 37 Failure analysis Scotseal Classic Scotseal Longlife External inspection inner diameter I D wear If the I D of the packing is shiny or has axial scratches the seal has spun on the shaft That c
54. tions created by road spray power washers and flooded docks SKF Scotseal Stamped Steel SKF Scotseal Lexan SKF Scotseal TF hubcaps Zinc plated and protected with weather Lightweight molded design using GE s equipped for P S I resistant armor to resist rust and rough Lexan handles harsh conditions sealed Four SKF hubcaps are compatible with wear Available in 3 to 8 bolt designs models offered for grease packed the Meritor Tire Inflation System MTIS systems Available for oil and grease by P S I an automatic tire inflation pro par applications system ATIS The system increases tire life fuel efficiency and vehicle productivity See the complete Scotseal TF hubcap part listing and interchange chart on page 55 www vsm skf com 1 800 882 0008 9 Product overview SKF tapered bearing sets SKF tapered bearings are engineered and manufactured to the highest quality standards Their design and superior materials provide a significant increase In operational reliability under heavy loads and misaligned conditions Made from the highest quality steel and engineered for longer service intervals the construction of the SKF tapered bearings handle a combination of radial and thrust loads Each tapered bearing set contains a precision matched cup and cone that are specifically designed to maximize bearing performance and life Additionally the SKF part numbers follow industry established numbers allowing for easy look up and
55. to meet the increasingly harsh conditions of today s heavy duty environments e Newly formulated material has superior tolerance and resistance to high temperatures e Specially formulated polymer is compatible with all known synthetic lubricants e Advanced seal design provides excellent performance in harsh environments and high braking conditions AIR SIDE gt Radial Dirt Lip Bore Tite Coating Axial Dirt Lip OIL amp BEARING lt SIDE Spring Bumper Packing Lip SHAFT The Scotseal Longlifes packing consists of four sealing lips a spring loaded primary sealing lip that Is factory pre lubed a radial and axial dirt lip plus an outer bumper lip that acts as a preliminary dirt excluder The Scotseal Longlife is pressfit into the hub bore using Scotseal Installation Tools Product overview Scotseal TF hubcaps Lighter than steel Tougher than aluminum Lightweight super strong Zytel resists impact damage chemicals road salt UV radiation and ozone O ring on the sidefill plug provides extra Oil bath design Proven center fill vented plug design closed except when venting Upgraded Splashguard protection also available Plated pre assembled retention bolts included protect against leaks at the bolt holes leak protection Embedded solid aluminum ring distributes an even leak proof load against the hub Magnetic side fill plug traps metal particles to protect s
56. tubular socket for the 1 50 12 amp 1 50 18 thread size a 3 six point thin tubular socket for the 2 625 12 amp 2 625 16 thread size a 3 3 4 six point thin tubular socket for 3 25 12 and a 4 1 8 six point tubular socket for the 3 48 12 amp 3 50 12 thread size with the appropriated calibrated torque wrench torque nut to 220 ft lbs while rotating the wheel After torque is achieved rotate wheel hub assembly an additional two full revolutions Wheel should not rotate freely at a nut torque of 220 ft lbs See fig 3 for socket placement GJ N Without disturbing the wheel hub back off the lock nut 5 one half turn Re torque SKF spindle wheel nut to 105 ft lbs while 6 rotating the wheel a Rotate two full additional revolutions b Back off nut 4 washer notches for 1 50 12 1 50 18 3 25 12 3 48 12 or 3 50 12 nuts Back off nut 6 washer notches for a 2 625 12 or 2 625 16 nut using the sight gage in flange of nut c Verify bearing end play of 001 to 003 of an inch using process In step 10 of this procedure 30 1 800 882 0008 www vsm skf com 7 When end play is verified it is time to arm the wheel bearing lock nut system for field use Without disturbing the wheel hub locate the slot cut in the flange of the wheel nut This slot is an alignment sight gage for the SHCS Spindle hub Cap Screws harmonic proof locking system See Figure 4 N AA Alignment N sight gage 8 If sight gage slot aligns
57. type used in the axle sump or hub assembly Never use an Impact wrench when tightening or loosening lug nuts or bolts during this procedure 2a For one piece spindle nut systems torque the nuttoa minimum of 300 ft lbs Do not back off the spindle nut Advance the nut until engagement takes place and the nut is locked www vsm skf com 1 800 882 0008 2b For a double nut or jam nut system torque the inner nut to 300 ft lbs Do not back off the spindle nut Install the outer nut with 200 ft lbs of torque NOTE Be sure to engage any locking device 2c Per ConMet Service Manual rev 2011 ConMet does not recommend the use of a one piece castellated type nut system for use with PreSet hubs 29 Disassembly Re assembly SKF Wheel bearing lock nut system installation and adjustment procedures 1 Ensure all wheel end components are assembled and WAR N N G pre lubricated if required to their respective manufac turer s warranty quality care and assembly instructions Failure to follow these instructions could cause the wheel to Care must be taken not to lubricate spindle threads come off and cause bodily injury and or property damage False torque readings will occur if spindle threads are lubricated Install the wheel bearing lock washer as shown in fig 1 IN all Mm Mr S The lock nut can now be threaded onto the spindle as shown in fig 2 and tightened by hand 4 Using a 2 six point thin
58. uses can be an improperly seated bearing where dirt or burrs prevent a flush mount an outer cup installed without the proper tool a warped shaft or nut faces that are out of line 48 1 800 882 0008 www vsm skf com Failure analysis for bearings Misalignment Uneven wear on the roller the result of improper installation Contamination Circular wear in the race the result of hard particle contamination in the lube Circular wear on the roller the result of hard particle contamination in the lube www vsm skf com 1 800 882 0008 Vertical etching on the race the result of moisture contamination within the lube 49 Failure analysis for bearings Misalignment ey a Boa Peeling the tearing away of metal from the race the result of the breakdown of Discoloration indicates high levels of heat the result of improper lubrication or lubrication improper bearing adjustment Installation damage Deformation of the cage the result of improper installation or mishandling prior Cage damage the result of abuse prior to or during installation to installation Cracked cone the result of misapplication or cocking the cone at installation Damage to the cup front face the result of installation damage through use of a hardened driver 50 1 800 882 0008 www vsm skf com Failure analysis for bearings Brinelling Brinelling the result of severe impact to the bearing causing one or mo
59. vsm skf com Stemco Discover 383 020 373 OP 383027 Sre Ws 373 0223 393 0204 383 0264 373 0205 373 0243 873 0276 SKF Hubcap interchange reference chart SKF TF Zytel Oil Grease 1282 1284 1600 16087 16127 1326 1613 1623 1627 1627 1630 1642 1643 1343 1643 1343 1644 1343 1343W 1665 1669 1670 1681 1691 1696 1399 1399W 1698 1698 1943 14433 1996 14993 Application Pro Par Trailer Trailer Hubo Steer Steer Steer Trailer Trailer Steer Trailer Trailer Trailer Trailer Trailer Steer Trailer Trailer Steer Steer Trailer Steer Trailer Trailer Trailer Trailer Trailer Trailer Stemco Oil 347 4009 340 4065 340 4024 340 4249 340 4066 340 4002 340 4019 340 4014 340 4013 340 4009 340 4046 340 4009 340 4042 340 4025 340 4034 340 4029 340 4098 340 4195 340 4059 340 4080 343 49 75 343 4065 343 4024 343 4249 343 4066 343 4002 343 4019 343 4014 343 4013 343 4009 343 4046 343 4009 343 4042 343 4025 343 4034 343 4029 343 4098 343 4195 343 4059 343 4080 343 4370 343 4372 350 4024 350 4249 350 4025 350 4034 Sentinel Oil 348 4075 348 4013 348 4009 348 4009 348 4195 Sentinel Grease 349 4075 349 4013 349 4009 349 4009 342 4009 349 4195 342 4195 340 4350 340 4352 National Oil Dual Dynamics HU 075A HU 065A HU O24A HU 149A HU O66A HU O19A HU
60. your way all the Remove the inner cup Be sure to wear gloves or use Remove the packing without disturbing the lip way around the seal straightening the outer cup a shop rag to protect your hands the open flange surfaces as shown flange edges are sharp si ees ad Pe om Fr Fee Fe am be A WERE Ve Em Fe DELUOTN Ee Majol ues a gt wi ww tI LU l te 06 MA A ws amp UM U aw Grease Lip grease Every Scotseal comes with grease between the primary and dirt lip If its not there its very likely oil has washed it away Suspects are excessive end play a cocked seal or improper ventilation of the wheel end dirt corrosion or paint plugged vent La www vsm skf com 1 800 882 0008 Brittle primary seal lip After cleaning the entire seal use your fingers to curl the primary seal lip back Run your finger completely around the circumference The oil lip should be smooth and pliable If not the seal has overheated lack of lubrication or overtightened bearing adjustment could be the cause Be sure to inspect bearings carefully Broken dirt lip Using the same technique check the dirt lip If its dry and brittle most likely its been baked lt will probably split away from the seal at some point around the circumference Lack of lubrication may have fried the bearings as well 39 Failure analysis Failure analysis Scotseal Classic Scotseal Longlife Internal inspection wear track

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