Answer Hello Raj. Here are the instructions from the manufacture. Hope this helps. Circulation System The circulation system consists of the following components: • Inlet Cover • Fine filter and sump filter • Sump • Circulation pump • Hub • Lower spray arm • Main conduit • Middle spray arm • Upper Spray arm The inlet cover prevents large particles from entering the sump. The fine filter (metal) and sump filter (plastic) prevent fine particles from entering the circulation-pump part of the sump (water entering the drain pump is not filtered by the fine filter or by the sump filter). The circulation pump is controlled by the control module and can be activated using service mode. The pump pushes water up through the hub to the lower spray arm and to the main conduit. The main conduit supplies water to the middle and upper spray arms. Inlet Cover Caution: Use care to avoid breaking the clip on the hub when removing the main conduit from hub. Remove the lower wash arm and main conduit to gain access to the inlet cover and sump. Fine Filter, Sump Filter, and Sump The dishwasher must be removed from its installation to gain access to the sump. The sump must be removed to allow removal of the fine filter and sump filter. Circulation Pump Note: It is extremely important that the self-tapping ground-wire screw on the circulation pump is tightened securely. The dishwasher must be removed from its installation to gain access to the circulation pump. The circulation pump can be activated using service mode (refer to the Service Mode chapter). Refer to schematic or strip circuit for motor resistance value. Lower Wash Arm Lift and rotate (ccw) the lower spray arm to remove it from the hub. Clean the screen on the water return if necessary. Read More... Answered by AppliancePartsPros.com | Friday, June 10, 2011