Ron G Wharton , TX January 16, 2017 Appliance: Model MAYTAG - MDB7600AWS Lower wash arm rotating slowly Found that the lower wash arm was rotating slowly due to Hard Water build up. Prior to replacement ran an empty load using CLR in-order to breakdown the Lime and Calcium build up. Once that was completed and rinsed (several cycles) completely, I was able to install the parts in less than 5mins. and now the Dishwasher is like new, being a 10yr. old unit. Ron Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes