My rack return had been acting up and I discovered that I had a sticky "bearing". The one on top of the beam, lift bearing I think. I split on the left side mostly and didn't realize that on the bolt that holds this bearing in place, it is drilled out so you can spray some wd40 or some other kind of lube in to help it be free, mine actually had gotten all gummed up from grease off the rack and debris all summer and wasn't turning real free any more(actually developed a flat spot on the bearing) and had to get a new one. Anyway, I have been heating mine up a little with a propane torch and then giving it a couple squirts of wd40 or pt blaster and it seems to run great all day.