Jan B Saint Albans , MO May 13, 2018 Appliance: Bosch Washer WFMC6400UC/01 Bosch Washer Wfmc6400uc/01: Drain pump impeller was loose noisy and not draining well. How to replace Drain Pump Motor Assembly. Replaced drain pump assembly. Removed back panel to reach electric connector. Then was able to remove entire assembly thru the 4” round service port in front of machine by loosening black rubber drain pipe, and then pulling off grey drain pipe. Next you slide the assebly back to disengage the 4 button rubber feet / grommets. Reverse for installation. Took opportunity to clean grey drain pipe thoroughly by sweeping and power washing. Lots of gunk in there. 4 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes