Due to the design of CARB toroidal roller bearings, the rings and roller complement may be displaced axially from their normal position during handling. Therefore, SKF recommends mounting CARB bearings when the shaft or housing is in the horizontal position. Also, whenever possible, rotate the inner or outer ring to align the rollers during mounting.
If CARB bearings are mounted when the shaft or housing is in the vertical position, the roller complement, together with the inner or outer ring will move downward until there is no more clearance. Then, when the bearing rings expand or contract as a result of an interference fit, a preload is likely to result. To prevent this preload condition from occurring, rotate the inner or outer ring during mounting. If this is not feasible, use a bearing handling tool or other device to keep the bearing components arranged centrally.
Mounting bearings with a tapered boreBearings with a tapered bore are always mounted with an interference fit. To obtain the proper degree of interference, one of the following methods can be used:
measuring the clearance reduction
measuring the lock nut tightening angle
measuring the axial drive-up
applying the SKF Drive-up Method
- measuring the inner ring expansion (SensorMount)
For additional information about these mounting methods, refer to Mounting bearings with a tapered bore, or the SKF bearing maintenance handbook.
For bearings with d > 100 mm, SKF recommends using the SKF Drive-up Method. This is a fast, reliable and safe method to achieve the appropriate interference fit. For additional information, refer to SKF Drive-up Method Program.
Recommended values to apply methods 1 to 3 are listed in table 1.