your tractor should have the aluminum rear end they have needle bearings at the outer end of the axles that have grease in them from the factory which depletes with use my local dealer recommends replacing after 500 hrs. I've been cleaning and repacking with good grease but they don't hold much. if they go dry it will tear up the axles , and the diff. gears ..pretty big $$$$$ if it was mine I'd take the suitcase weights off and add weight in the tires to lessen the weight on the bearings
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