4055790481 Genuine Upper Spray Arm Impeller for Westinghouse Dishwashers, Top Spray Arm Impeller Replacement Part

Part 4055790481 is a genuine Electrolux impeller for the upper spray arm of a Westinghouse dishwasher. The upper arm sits under the top basket and spins on water pressure to wash glasses and cups. If this part is cracked, worn or missing, the arm can slow down or stop, and the top rack comes out dirty. We don't have a model list for it, so check that the number on your old part reads 4055790481 before you order.

Top rack not getting clean? The upper spray arm impeller

Dishwasher spray arms are driven by the water leaving their jets, so any part that affects how the arm is fed or how it turns shows up straight away in wash results. A damaged impeller can leave the upper arm sluggish or stationary, so glasses keep a film, cups hold dirty water in the base and food stays stuck to items in the top basket. You might also hear the arm knocking, or find it resting at the same angle after every cycle. Clear the jets with a toothpick and check the filter first, because low water flow causes the same symptoms.

Part details

• Genuine Electrolux part 4055790481
• Impeller for the upper spray arm
• Westinghouse dishwasher part, model fit not on file
• Check the number on your old part before ordering

Fitting the upper spray arm impeller

Switch the dishwasher off at the wall first. Pull the top basket out fully and look underneath to see how the upper arm and its impeller are held, usually by a twist-off nut or clip. Take a photo, then remove the old part and clean any grit from the seat. Fit the new impeller, refit the arm and spin it by hand to check it turns freely without rubbing on the basket.

Questions about this part

How can I tell if the upper arm is turning during a wash?

Put a small piece of tape on one end of the arm and note where it rests. Run a rinse cycle, pause it partway and check the tape. If the arm hasn't moved, look for blocked jets first, then a worn impeller or hub.