NTN BEARING CORP.OF AMERICA

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 HM129848-90248 Tapered Roller Bearing Assemblies
Insert Bearing Unit
Square flange shape
TIMKEN HM129848-90246 Tapered Roller Bearing Assemblies
50 ~ 60
Black Oxide Coating
TIMKEN HM129848-90218 Tapered Roller Bearing Assemblies
DD (Contact Rubber S
No
TIMKEN L217849-60000/L217813-60000 Tapered Roller Bearing Assemblies
Bearings with Housin
No
TIMKEN HM129848-90212 Tapered Roller Bearing Assemblies
Steel
Quote
TIMKEN HM129848-90210 Tapered Roller Bearing Assemblies
Low Carbon Steel
For Inner Ring
TIMKEN HM129848-90200 Tapered Roller Bearing Assemblies
22 mm
HML88
TIMKEN L217849-90077 Tapered Roller Bearing Assemblies
8 Days
Deep Groove Ball Bea
TIMKEN HM129848-90199 Tapered Roller Bearing Assemblies
304 Stainless Steel
6
TIMKEN L217849-90075 Tapered Roller Bearing Assemblies
For Heavy Load
6
TIMKEN HM129848-90192 Tapered Roller Bearing Assemblies
Ball
With Retaining Ring
TIMKEN L217849-50000/L217813-50000 Tapered Roller Bearing Assemblies
19.8 in
134885 lbf
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