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Which adjustment does a taper roller wheel bearing require?

  • A.Shimming
  • B.A torque setting applied to the driveshaft nut, which clamps the bearing and sets the preload automatically thereafter
  • C.A specified preload or endfloat set by the retaining nut
  • D.No adjustment at all, since the bearing is supplied as a sealed unit and is simply pressed into the hub carrier

Answer: C

Taper rollers are set by tightening the nut while turning the hub, then slackening to the specified endfloat and locking it. Sealed cartridge bearings need no adjustment, and driveshaft nut torque applies to a different arrangement. Overtightening destroys the bearing quickly. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The shared behaviour explains why these belong together and the differences explain why both exist.

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