Jo Anne B Prospect , CT August 28, 2016 Appliance: Whirlpool Undercounter Dishwasher DUL200PKT1 Whirlpool Dishwasher Dul200pkt1: Dishwasher was not cleaning upper rack and silverware. How to replace Dishwasher Spray Arm Ring Bearing. We replaced the spray arm and the upper and lower bushings. The spray arm nut was fine. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes