Which bearing type has no specified adjustment procedure?

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Sealed ball bearings are designed as complete, pre-lubricated units with their internal clearance fixed at the factory. The seals trap the lubricant and keep contaminants out, so there is no practical way or specification for an adjustment procedure after installation. If a sealed bearing wears or goes out of spec, the correct fix is to replace the entire unit rather than attempt to adjust it.

Other bearing types rely on adjustable clearances or preloads during assembly. Tapered roller bearings use spacers, cups, and nuts to set preload and end play, which are adjusted during installation. Needle bearings typically require precise spacing and mounting tolerances to achieve the correct internal clearance. Ball bearings that use grease seals may still require adjustment in certain configurations, but the sealed ball bearing unit itself does not.