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HOW TO REPLACE SPINDLE BEARINGS on Exmark zero-turn mowers.
If your Exmark ZeroTurn makes a (different) roaring sound when you engage the deck, then the most likely fault is a bearing. There are a couple idler pulleys on top that have (non-replaceable) bearings so check them first. Release the belt and if any of the pulleys can be wobbled from side to side, then they need to be replaced.
When you are certain that the idlers are ok, then you need to repair the spindles. New spindles are from $130-$450 each! Total cost of (6) bearings and (12) o-rings is about $150 for my model - order for your EXACT model.