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Although the main point of this job is to replace the worn bushes, cleaning and a full inspection makes sense. The end of the rack body has a grease seal which consists of two leather rings and a rubber O ring, held in place by a pressed in steel ring. To remove this ring, a screwdriver can be used to tap the edge up at one point, then gently lever around its rim until it comes out
These parts should really be replaced as a matter of course, as with all seals, but sourcing replacements is a problem and, provided the sealing components are still flexible and not showing deterioration, it's not essential. The rack is lubricated with grease rather than oil and it's vented elsewhere, so there's no danger of pressure building. In this case, the seals were all OK so they were cleaned up and re-used.
The metal parts are unlikely to wear but should be thoroughly cleaned and examined. The bushes are another matter - one had disintegrated completely, filling the cage with bits of nylon, and the other was starting to split. These have to be replaced!
