Several "failure modes" for oil bath wheel bearings.
Most common are leaking seal allowing oil to run out. No oil, bearings seize.
Contamination of oil-- driving in deep water can allow water to enter and the now oil/water combination has little lubricating properties.
Best advice is to check fluid level occasionally and immediately if you ever see streaks of oil radiating out from the hub or signs of oil leaking inside the wheel/on brake components.
And, it not clear, clean gear lube, change immediately.
These are really good systems used on virtually all OTR trucks, but like most anything mechanical they are not totally maintenance free.
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Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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