The 5 best tips for internal extraction
Perfecting the art of internal extraction – KUKKO explains what you need to do!
Internal extractors are used to pull out bearings and bushings that are not accessible externally because they are positioned in a recess. To grip a bearing with an internal extractor, either a counterstay (series 22) or a slide hammer (series 22-0) is always needed.
To extract bearings that are in a housing and on a shaft, you will need a special bearing extractor. With its pulling hooks, the series 70 (PULLPO) grips the outer ring of the bearing with both precision and non-destructive gentleness.
Here are our professional tips!
1. Insert the internal extractor correctly
The internal extractor must always grip the part to be extracted from underneath. If you are using a counterstay, you must always ensure that its arms are not resting on top of the part to be extracted.
2. Use extensions
With the aid of extensions, you can add extra depth to series 21 internal extractors to allow you to remove parts sitting further down in the bushing without destroying them.
3. Use thread adapters
Series 22-1-AS thread adapters can be used in combination with a slide hammer or a counterstay. These adapters assume the function of an internal extractor wherever threaded pins are screwed into the part to be extracted.
4. Slide hammer v. counterstay
Once the internal extractor has a good grip on the inner ring of the bearing, the powerful clamping effect will allow it to be extracted quickly. Here you can use either a slide hammer or a counterstay. The advantage of the slide hammer is that parts can be extracted in very confined spaces with no need for bracing; on the other hand, the use of a counterstay makes it possible to work more precisely and with greater force.
5. Use segment internal extractors
For the extraction of flat bearings, bearing outer rings and bushings, we recommend segment internal extractors of the series 21-E. The extra narrow gripping edges allow dismounting even when there is little space under the component to be extracted.
Internal extraction with muscle power alone – with a combination of internal extractor and slide hammer.
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