Please help. Anyone else have this problem? I've got a 44 inch I'm using to mulch instead of the Walkers. The middle idler the one close to the front of the mower went out. I got a new one and put it on. Now the middle blade won't cut? I've lifted the inspection foot rest and mowed some. The blade looks like it working fine. But, when you look behind you the middle blade is not really cutting. When the idler broke the belt heated up in a couple of places. I don't understand it. The outside blades are working fine..I put a new blade on the still got the same results. Any ideas??