I bought A used Murray Lawn Tractor

Model # 0-40627x92B, last fall. Every thing worked fine until this spring

Now I'm having a problem with uneven mowing, I have replaced the bearings,

pulleys, and blades, on both sides and the spindle on the left, but I still get a strip of lawn not cut even on the right inside of the deck plate. Any help would be appreciated. I'm also looking for a repair manual.