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Which final drive component is most sensitive to oil starvation?

  • A.The differential planet gears, which are enclosed within the cage and therefore receive the least oil of all
  • B.The pinion bearings at the highest point
  • C.The crown wheel, which is partly submerged and therefore carries the oil to the other components within the casing
  • D.The half shafts

Answer: B

The pinion head bearing sits above the oil level and relies on splash from the crown wheel, so a low level starves it first. Baffles and oil galleries are provided to direct the flow. The crown wheel itself runs in the oil and is well supplied. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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