Jeff R Springfield , VA February 01, 2016 Appliance: Maytag Washer- Horizontal Axis MAH6500AWW Maytag Washer Mah6500aww: Mayteg neptune washer was displaying "nd" water not draiining. How to replace Drain Pump Assembly. I took out the bad drain pump and purchased a new one from AppliancePartsPros. I watched the video on how to remove the bad pump and install a new pump. Took a little over 30 minutes to put the new in. 34 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes