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Product information

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Recommendations

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Product data Page ............. 3 Dismounting Page ............. 24

Dismounting

handles ( âž” fig
8 ) that is simple andeasy-to-use and avoids shaft and inner ring damage.The use of electric withdrawal toolsbecomes economic when bearings of the same size are frequently mounted and dismounted. These electrical induction heaters have one or more coils energized by alternating current. It is necessary to demagnetize the inner rings after heating and removal.Pullers, heaters and heating ringsare available from SKF. Additionalinfor-mation can be found in the catalogue MP3000 “SKF Maintenance and Lubrication Products” or online at www.skf.com.
Fig 6 Withdrawal tool If the bearings are to be reused afterinspection, they must be dismounted as carefully as they were mounted. Dismounting an outer ring is easier if tapped holes are provided in the housing shoulders to take withdrawal screws ( âž” fig ). The inner ring of a cylindrical rollerbearing can be dismounted mechan- ically or with heat. The inner ring of small bearings andthe inner ring with roller and cage assembly of N-type bearings can be removed using mechanical withdrawal tools. This can be performed with• a jaw puller, if the shaft is pre-machined ( âž” fig ) or• a strong back puller such as SKFTMBS pullers, when there is enough space behind ( âž” fig ).Special heaters have been develop-ed to dismount the inner rings of cylindrical roller bearings having no flanges or only one flange. They heat the inner ring rapidly without appre- ciably heating the shaft, so that the expanded inner ring can be removed easily.If inner rings do not have to be removedfrequently, or if larger sizes of inner rings (up to approximately 400 mm bore diameter) have to be dismounted the use of an aluminium heating ring is the preferred method.This tool consistsof a slotted ring with

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5 6 7 Fig 7 The use of a mounting sleeve facilitatesthe assembly of a larger number of bearingsOuter rings can be removed more easilyif tapped holes are provided in the housing shoulder Notches pre-machined in the shaftshoulder that accommodate puller armseliminate the risk of damaging the innerring or seatingThe SKF TMBS strong back puller issupplied in kit form to cover the mostdifficult pulling operations The SKF TMBR series aluminium heatingring is an economic, easy-to-use tool tomount and dismount inner rings Fig 4 Fig 5 Fig 8 21