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 18790-50000/18720-50000 Tapered Roller Bearing Assemblies
VV (Non-Contact Rubb
1045 Carbon Steel
TIMKEN 18790-90048 Tapered Roller Bearing Assemblies
No
60
TIMKEN 18790-90037 Tapered Roller Bearing Assemblies
2 x 5/8
9-5/8 in
TIMKEN 18780-90046 Tapered Roller Bearing Assemblies
Single Row
Creep prevention bea
TIMKEN 18690-50000/18620-50000 Tapered Roller Bearing Assemblies
92700
No
TIMKEN 18690-90064 Tapered Roller Bearing Assemblies
Punching
16**/6*** series
TIMKEN 495A-90273 Tapered Roller Bearing Assemblies
Round Type
104
TIMKEN 98400-902A5 Tapered Roller Bearing Assemblies
41 ~ 50
T, h Configurable
TIMKEN 98400-90074 Tapered Roller Bearing Assemblies
6
Flanged Pilot Type
TIMKEN 495A-90229 Tapered Roller Bearing Assemblies
6
Flanged Pilot Type
TIMKEN H337846-90270 Tapered Roller Bearing Assemblies
41
[Steel] Steel
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