NKE Hauptkatalog / General Catalogue 2011

Handling, Mounting andDismounting Rolling BearingsSmall size rolling bearings may be dismountedeasily by mechanical means (fi g. 10.32).It is restated that when bearings are planned forre-use, and removal is by the “press-method”, alltransmission forces via the rolling elements mustbe strictly avoided.The position of bearings that are mounted onshafts by means of adapter sleeves should bemarked on the shaft to provide an easy refi ttingdatum.After marking the position, the fi xing tongue of thelocking device must to be bent up. The lock nut isloosened but not completely removed.Fig. 10.32Several special dismounting tools and systemsare available to remove bearings additional to thecommonly used and proven caw pullers. The clawtools, generally used for medium and large sizedrolling bearings, consist of a spindle which actseither mechanically or hydraulically, in conjunctionwith various different sizes of claw legs and bridgeswhich when assembled into 2 or 3 leg pullers meetthe individual application requirements.In the case of bearings located with interferencefits a removal by means of presses may be ofadvantage, (fi g. 10.33).To dismount the bearing totally, it is driven fromthe adapter sleeve by hammer blows around itscircumference (fi g. 10.34).Fig. 10.34If the bearing is located close to the end of ashaft, the loosening of the bearing may also becompleted by applying impact bushings.It is particularly important that when adaptersleeves are dismounted or mounted special caremust be taken at all times to avoid damage.The bearing can only be removed when it is looseon its seat and the locknut and lock washer iscompletely removed.Fig. 10.33Following the bearing removal the adapter sleeveis easily removed.366www.nke.at