A bearing may be removed for periodic inspection or periodic change. If the removed bearing is to be used again or it is removed only for inspection, it should be dismounted as carefully as when it was mounted. If the bearing has an interference fit, its removal may be more difficult. The tool for removal should be designed according to actual needs. The dismounting method, dismounting sequence, mounting fit shall be studied through drawing in order to protect the bearing from damage.

Dismounting of bearings with cylindrical bores

For small bearings using pressing force (Fig 12.5) or withdrawal force (Fig 12.6) is often used. The efficiency to dismount is high and there is no damage to the bearings.

To make it convenient for withdrawal operation (see Fig 12.7 and Fig 12.8), it is advisable to cut grooves in the shoulder to accommodate the withdrawal tools.

For large bearings mounted with stationary fit, a heavy withdrawal force will be used to dismount since there is friction on the surface after a long term operation. Induction heating is also used to dismount bearings frequently of this type as the efficiency is higher.

Dismounting of bearings with tapered bores

When dismounting relatively small bearings with adapter sleeves, a circular stop is used to support the end face of the inner ring after loosening fastening nut, and then a hammer is used to dismount bearing as shown in Fig 12.9. For bearing installed with a withdrawal sleeve, dismounting can be achieved by tightening the nut and remove the withdrawal sleeve as shown in Fig12.10.

Bearings mounted directly on tapered shaft or large bearings with adapter sleeves or withdrawal sleeves may be dismounted easily by using oil pressure. Fig12.11 illustrates the dismounting of a bearing mounted on a tapered shaft by forcing oil pressure on the fitting surface.