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 HM231140-90104 Tapered Roller Bearing Assemblies
304391 lbf
Split Cylindrical Ho
TIMKEN 596-90117 Tapered Roller Bearing Assemblies
10
41
TIMKEN 596-90067 Tapered Roller Bearing Assemblies
25.5 in
22.5 in
TIMKEN H337840-90182 Tapered Roller Bearing Assemblies
Insert Bearing Unit
Medium Load
TIMKEN H337840-90084 Tapered Roller Bearing Assemblies
No
Oil Supply Type
TIMKEN 495-90134 Tapered Roller Bearing Assemblies
No
Insert Bearing Unit
TIMKEN H337840-90014 Tapered Roller Bearing Assemblies
SR130X5
70 mm
TIMKEN 767D-90186 Tapered Roller Bearing Assemblies
Cast Iron
Tapered hole adapter
TIMKEN 495-90019 Tapered Roller Bearing Assemblies
6903
Not Provided
TIMKEN 767D-90183 Tapered Roller Bearing Assemblies
518 mm
3.02
TIMKEN 97500-90033 Tapered Roller Bearing Assemblies
DD (Contact Rubber S
8 Days
TIMKEN 495-90018 Tapered Roller Bearing Assemblies
0.650 in
10.66 in
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