Customer Questions and Answers for Dishwasher Lower Spray Arm Support Hub by Whirlpool

David, Here are some instructions to assist you in removing the lower arm assembly and accessing the chopper blade : 1. Remove the two (2) dishracks from the dishwasher tub. 2. Remove the two (2) screws securing the Inner Feed Tube to the inside of the dishwasher tub.3. Rotate the rear feed cap ¼ turn clockwise. 4. The entire inner water tube assembly and the lower spray arm assembly can now be removed from the dishwasher tub. Accessing Components of the Sump Assembly, Components inside the sump can be accessed without removing the sump from the dishwasher tub. 1. Remove the four (4) screws securing the soil accumulator from the sump base. 2. The soil accumulator will now lift free of the sump base.3. Remove the screw securing the foreign objects protector to the sump base and remove the protector. 4. Remove the screw securing the inlet protector to the pump base and lift the inlet protector out.5. Remove the chopper assembly from the impeller shaft and lift it from the sump base. 5. Remove the chopper assembly from the impeller shaft and lift it from the sump base. Good Luck, and Thanks.