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Old 08-23-2020, 06:20 PM
  #4  
capt_matt
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Join Date: May 2006
Location: Maryland
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When you added more grease, did you also wipe some away when it oozed at at the front of the hub? If not, you filled up the front dust cover with grease and then the grease got hot when the trailer was rolling and found the path of least resistance out of the hub.

When greasing, remove the front dust cover entirely, not just the rubber plug. Then pump in grease and wipe away the grease that oozes out of the outside bearing before you reinstall the metal dust cover. The air space in the dust cover gives room for the grease to expand into once it warms up and is under pressure from the spinning bearing.

To paraphrase the first law of thermodynamics, grease is neither created nor destroyed in a hub, it is changed from one form to another. You added grease and it had to go somewhere once it warmed up!