Wheel Seal Leak and Bearing Inspection on a Drive Axle
A customer brings in a rear drive axle from a 2014 Class 7 truck for a wheel seal and bearing job. The right-side hub is off, the seal is clearly leaking, and the outer bearing shows heat discoloration and pitting on two rollers. The inner bearing looks clean. The customer wants 'just the seal and the outer bearing, the inner is fine.' The axle has 310,000 miles and no record of a prior wheel-end service. Your catalog shows the seal, outer bearing, inner bearing, and a bearing cup as separate line items; the cup is sold with the bearing as a set or individually.
1. Should the counter person sell only the seal and outer bearing as requested? Explain the technical reasoning.
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Selling only the seal and outer bearing is poor practice here. Heat discoloration and pitting on the outer bearing indicate a lubrication or preload problem, and the matching cup (race) is almost certainly worn or damaged as well - bearings and cups wear as a mated set and should be replaced together. The inner bearing on the same hub shares the same lubricant and load environment; at 310,000 miles with no service history, it should be inspected closely and likely replaced.
The seal leak itself is a symptom, not the root cause. If the cause was a failed bearing, a worn spindle, or excessive end play, replacing only the seal and outer bearing leaves the root cause in place and the leak will return. The counter person should recommend the full wheel-end kit: seal, inner and outer bearings with cups, and the appropriate fastener or lock hardware, and explain why.
2. The customer insists on the minimal parts. How should the sale proceed, and what should be noted on the invoice?
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The counter person can complete the sale the customer requests but must document the recommendation and the customer's decision. On the invoice, note: the observed condition (outer bearing heat discoloration and pitting, inner bearing visually clean but unmeasured), the recommendation for a full bearing and cup set plus inner bearing replacement, and the statement that the customer declined the recommendation and elected seal plus outer bearing only.
Also advise the customer verbally and in writing that reusing the old cup with a new bearing can cause premature failure, and that the inner bearing and spindle should be measured before reassembly. If the customer later returns with a repeat leak, this record shows the store identified the risk and the customer chose otherwise. Do not alter the invoice to imply a full kit was sold.