Ed P Westminster , CO August 28, 2020 Appliance: Maytag Dishwasher MDB6650AWB Maytag Dishwasher Mdb6650awb: Water would not drain and made a grinding noise when the pump came on. How to replace Discharge Housing Assembly. I took apart the bottom sprayer assembly and with the help of your parts diagram I was able to determine witch parts were broken. The impeller was totally broken apart and the plastic plate in the discharge assembly was sheared off. Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours