NTN BEARING CORP.OF AMERICA

NTN 6206llu Bearing

 

Tapered Roller Bearing Assemblies

The proper adjustment of the two bearings in the hub assembly is one of the most important aspects of the installation process.Excessive tightening of the adjustment nut, otherwise known as excessive preload, can cause the type of rapid deep spalling shown in these pictures. This deep spalling occurs when the direct contact between rollers and raceway caused by excessive preload super heats the bearing, softening the material, and allowing chunks to be torn away from the raceway and rollers during operation.

On the other side of the spectrum, loosening the adjustment nut too much will cause excessive end play in the bearings, allowing a rocking motion that disrupts the even distribution of force along the rollers. This, too, can cause bearing failure resulting in damage similar to that in this picture. As you can see, the damage is restricted to one section of the raceway that underwent extreme stress due to excessive end play.
The key then is to hit the sweet spot between too much end play and not enough. For Timken bearings, this means achieving an end play between .001 inches and .005 inches. To help, Timken has established an easily measurable three step adjustment procedure.

TIMKEN L281147-904A1  Tapered Roller Bearing Assemblies
TIMKEN L281147-904A1 Tapered Roller Bearing Assemblies
09195AB
0.7500 in
TIMKEN L281146-90024  Tapered Roller Bearing Assemblies
TIMKEN L281146-90024 Tapered Roller Bearing Assemblies
Flange Type
No
TIMKEN L269143-30000/L269110-30000  Tapered Roller Bearing Assemblies
TIMKEN L269143-30000/L269110-30000 Tapered Roller Bearing Assemblies
10-31/32 in
36179 lbf
TIMKEN L269143-20000/L269110-20000  Tapered Roller Bearing Assemblies
TIMKEN L269143-20000/L269110-20000 Tapered Roller Bearing Assemblies
No
18000
TIMKEN HM129848-90274  Tapered Roller Bearing Assemblies
TIMKEN HM129848-90274 Tapered Roller Bearing Assemblies
Cam Followers
151
TIMKEN L225849-60651/L225810-60651  Tapered Roller Bearing Assemblies
TIMKEN L225849-60651/L225810-60651 Tapered Roller Bearing Assemblies
Cylindrical Bore Set
With steel plate cov
TIMKEN L225849-50000/L225810-50000  Tapered Roller Bearing Assemblies
TIMKEN L225849-50000/L225810-50000 Tapered Roller Bearing Assemblies
Stamped Steel
555-S
TIMKEN HM129848-90270  Tapered Roller Bearing Assemblies
TIMKEN HM129848-90270 Tapered Roller Bearing Assemblies
0.2 in
4.5 in
TIMKEN HM129848-90264  Tapered Roller Bearing Assemblies
TIMKEN HM129848-90264 Tapered Roller Bearing Assemblies
Bearings with Housin
Deep Groove Ball Bea
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