The Dishwasher Upper Track supports the left side of the upper dishrack assembly and helps it easily move in and out of the dishwasher. Please note that this part is sold separately. If your appliance's upper rack isn't moving in and out of the appliance as expected, replacing this part may alleviate the issue. Recommended Item: Dishwasher Upper Track, Right Side (W11259786) is sold separately and may also be needed during this repair. Replacing this part will require basic hand tools, some disassembly of the dishwasher and novice repair experience. You must unplug the dishwasher or shut off the house circuit breaker for the appliance before installing this part. Also be sure to turn off the water supply to your dishwasher before you begin. Helpful Tip: We also recommend using affresh® Dishwasher Cleaner (item W10282479) to help remove limescale and mineral build-up that can be unsightly and affect your dishwasher's performance. *affresh® brand products are owned and distributed by Whirlpool Corporation.