Spherical plain bearings
If bearings are to be re-used after dismounting, the same care and attention are required during dismounting as when mounting. The requisite withdrawal force should always be applied to the ring which is being dismounted. SKF offers an assortment of different pullers to accommodate many applications. If the shaft is pre-machined to accommodate the arms of a jaw puller, then a two- or three-armed puller can be used (fig. 1).
In other cases where there is enough space behind the ring, a strong back puller such as the SKF TMBS series can be used (fig. 2). For large bearings with an interference fit, dismounting is considerably facilitated if the SKF oil injection method is used (fig. 3). The oil ducts and distributor grooves should be provided when designing the bearing arrangement (Design of bearing arrangements).
Small bearings can be dismounted using a mounting dolly or a length of tubing applied to the outer ring. For larger bearings with an interference fit, a mechanical or hydraulic press should be used when possible. It is also possible to dismount a bearing from the housing bore by quickly heating the housing without heating the bearing outer ring to any extent.
To dismount rod ends, the lock nut securing the shank should be loosened and, if possible, the rod end should be unscrewed from its rod or tube. The rod end can then be removed from the pin or shaft in the same way as a bearing, e.g. using a puller or a press.