I have a 05 Wildcat with a 61" deck. This year the blade belt jumps off "sometimes" when I engage the blades. It is especially bad when the rpm is low. Mower, blades run fine when the belt stays on.
Here's what I have done so far.
Changed idler spring
Changed blades and belt
Bearings get greased regular and have oiled all 3 additional pulleys.
Under deck has been cleaned.
Checked level on deck.
I changed out my clutch last year and gap was good. Any ideas. The blade spindles spin smooth, could it be one of the pulleys, they appear and sound o.k.