What are bearing withdrawal sleeves?

A tapered bore bearing can be mounted onto a cylindrical stepped shaft through the use of a tapered withdrawal sleeve also. The sleeve is pressed into the bearing bore that abuts a fixed component. The sleeve is then located on the shaft by a nit or an end plate. For larger bearings, large forces are needed to overcome the friction of mating surfaces as the withdrawal sleeve is pressed on to the bearing bore. Hydraulic mounting can ease this process with both adapter sleeves and withdrawal sleeves.