Marcus L Sunnyvale , CA November 22, 2015 Appliance: Whirlpool Undercounter Dishwasher GU1108XTLB1 Whirlpool Dishwasher Gu1108xtlb1: Dishwasher making loud grinding noise whenever water is circulating. How to replace Dishwasher Circulation Pump Motor. I ordered a circulation motor from AppliancePartsPros.com. I watched their video and was able to change the motor fairly easily. This fixed the problem. The part arrived super fast in just 2 days. What a great site. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes