The dishwasher roller assembly attaches to the upper dishrack. It allows the dishrack to slide out easily. If the upper rack keeps falling off the track in dishwasher, the door will not close, the door makes noises, and/or dishes are not cleaning properly, it is best to replace it for more security. A flat-blade screwdriver is the only tool needed for this installation. Slide open the upper dishwasher rack and remove the retaining tabs from both ends of the rack and slide it out. Locate the older roll assembly, remove it, and replace the rollers. Remember to put back the tabs on each side before sliding it back in. Make sure the dishwasher is turned off before starting this repair.