Gary M Great Mills , MD January 26, 2015 Appliance: KitchenAid Undercounter Dishwasher KUDW03CTBL2 Kitchenaid Dishwasher Kudw03ctbl2: Humming/whine main circulation pump. How to replace Dishwasher Circulation Pump Motor. After verifying that the grinder was in good shape and reviewing the self-help videos, I decided the humming/whine I heard must be the bearings in the main pump. I always liked this appliance because it did a great job of cleaning the dishes was VERY quiet until the humming/whine began. I reviewed the repair videos and decided to repair it myself. Although the washer is five years old, the repair was worth the effort. It a few hours to remove and replace the dishwasher from under the counter, but the motor replacement itself only took about 10 minutes. Everything went great. I also had a chance to give the dishwasher a thorough cleaning inside and out. It's been running quietly and efficiently since the repair. It's like having a brand new machine! Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours