Tapered Roller Bearing Assemblies

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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

09195AB 0.7500 in
0.94 in 2.2

TIMKEN L281146-90024 Tapered Roller Bearing Assemblies

Flange Type No
6 Bearings with Housin

TIMKEN L269143-30000/L269110-30000 Tapered Roller Bearing Assemblies

10-31/32 in 36179 lbf
4.4 in 2-15/16 in

TIMKEN L269143-20000/L269110-20000 Tapered Roller Bearing Assemblies

No 18000
No Open Type

TIMKEN HM129848-90274 Tapered Roller Bearing Assemblies

Cam Followers 151
6 Days Hex Socket on Head

TIMKEN L225849-60650/L225810-60650 Tapered Roller Bearing Assemblies

215 mm 1.69
0.35 0.103

TIMKEN L225849-60651/L225810-60651 Tapered Roller Bearing Assemblies

Cylindrical Bore Set With steel plate cov
No Insert Bearing Unit

TIMKEN L225849-50000/L225810-50000 Tapered Roller Bearing Assemblies

Stamped Steel 555-S
0.08 in 552-B

TIMKEN HM129848-90270 Tapered Roller Bearing Assemblies

0.2 in 4.5 in
Kevlar Packing Seal 2-7/16 in

TIMKEN HM129848-90264 Tapered Roller Bearing Assemblies

Bearings with Housin Deep Groove Ball Bea
Yes (with retaining 6007

TIMKEN HM129848-90266 Tapered Roller Bearing Assemblies

6 Flange Type
Stainless Steel No

TIMKEN L225842-50000/L225810-50000 Tapered Roller Bearing Assemblies

65 Insert Bearing Unit
Pillow Type No
1/11