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 L217849-90065 Tapered Roller Bearing Assemblies
Bearings with Housin
Double
TIMKEN L217849-90052 Tapered Roller Bearing Assemblies
Type NU
Cylindrical Roller
TIMKEN L217849-90043 Tapered Roller Bearing Assemblies
Light Series
1970 rpm
TIMKEN L217849-90039 Tapered Roller Bearing Assemblies
Flanged Pilot Type
Deep Groove Ball Bea
TIMKEN L217849-50000/L217810-50000 Tapered Roller Bearing Assemblies
233.0 mm
200 mm
TIMKEN L217849-90020 Tapered Roller Bearing Assemblies
Quote
Bearing unit
TIMKEN HM129848-90177 Tapered Roller Bearing Assemblies
7 Days
Deep Groove Ball Bea
TIMKEN HM129848-90176 Tapered Roller Bearing Assemblies
4.5625 in
14.0000 in
TIMKEN 30317M 90KM1 Tapered Roller Bearing Assemblies
Take-Up Type
Tapered hole adapter
TIMKEN 14117A-902A1 Tapered Roller Bearing Assemblies
Bearings with Housin
1045 Carbon Steel
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