Dori P Harrisburg , PA December 07, 2014 Appliance: Maytag Undercounter Dishwasher MDBH965AWS40 Maytag Dishwasher Mdbh965aws40: Plastic wheel on upper rack broke off. How to replace Rack Adjuster Assembly. Was super easy to find this part (too bad we had to buy the whole assembly) for our particular dishwasher. Took off the old one, put on the new one. Really, quite straight-forward. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes