My farm tractor is Cat2 and the mower deck that came with it was Cat1. The previous owner ran it that way since it was new, I guess he didn't know it was wrong. I bought the bushings and tightened it up, but after the light finally came on to the fact that I don't have a Cat1 tractor anymore, I bought new pins and changed the deck to Cat2, so I don't lose the bushings when I take the deck off. The new pins tightened it up even more, because the old pins were worn from running loose all those years. Now the deck stays in line behind the tractor, nice!