Toro Z449, 19hp kawasaki engine with 42" turboforce deck. The engine rusn absolutely great, new plugs, new air, oil, and fuel filters. Hydraulics seem fine, as soon as the pto is turned on the engine seems to bog down real bad, blades don't spin near as fast as they use to and whenever you try to drive it it drives but if you give it full speed (in or out of grass) it bogs down even more. I really don't think the problem is in the engine, it runs fine and this morning I pushed against a pecan tree in my yard to see if it bogged under a load. I eased up to the tree and pushed and the tires spun without ever bogging the engine down so I am pretty sure it is from the engagement clutch on out. I'm thinking I may have a spindle gone bad and requiring alot of power to turn it, but wouldn't the belt slip and start burning if this were the case? Is there anything that may have gone wrong in the clutch itself causing this? Other than the mower blades not turning full speed and the engine seems to be bogged down it still cuts great, just doesn't disperse clippings very well.