Turn off the dishwasher breaker in your service panel.
Roper dishwashers are designed to be installed permanently under the countertops in your kitchen. Many of the dishwasher's components, including the dishwasher drain, check valve and food chopper, are located below the bottom drain screen, which sits on the floor of the dishwasher. To access these components for repairs, it is necessary to first remove the lower wash arm, then remove the bottom drain screen.
Open the dishwasher and remove the lower dish rack.
Lift the tab on the water supply tube, located behind the lower wash arm, then rotate the lower wash arm assembly clockwise and remove it.
Remove the screws from the top of the lower wash arm support and filter, then lift the assembly out of the dishwasher.