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The air collar housing also needs close inspection as wear patterns on it mean a poor installation. Patterns like this happen when the hole in the bearing cap for the air line is not completely centered, which cocks the seal housing to one side when the cap is torqued. This results in a poor seal that allows tiny droplets of oil to creep in, thus filling the air line with gear oil.
The Truth About Air Lockers

The air collar housing also needs close inspection as wear patterns on it mean a poor installation. Patterns like this happen when the hole in the bearing cap for the air line is not completely centered, which cocks the seal housing to one side when the cap is torqued. This results in a poor seal that allows tiny droplets of oil to creep in, thus filling the air line with gear oil.  View Related Article

 

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