The PTO lever on my Yard Man riding mower (22 hp BS engine, 46"deck) will not stay engaged. It will engage the blades if I hold it in the engage position, but I have to use a bungee cord to keep it there. This problem has come on over time, not all of a sudden. I can not see any broken springs, cable, or obviously bent parts - however I am not sure what kept the lever in the engaged position to begin with. I am open to any ideas. Thanks

Check the tensioner pulley. The spring may be sprung. Also you may need to go down 1/2" on your belt size. That's what I had to do also.