I took the unit out and put it on the counter, and realized that one wheel on the track was missing on the right side. I looked it up on the AppliancePartsPros.com website, and there it was... the small wheel. I ordered it and when it arrived, I followed the instructions and it just snapped on. What a difference! Now I can slide that lower rack out with ease. Amazing how one tiny wheel is so important in the dynamic of sliding out the dishwasher racks!