Mower deck troy bilt 77T lawn mower problems

breadman

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I have a troy bilt 42" cut riding mower. I seem to have two issues..not sure if they are related or two seperate problems:
1. The blades do not disengage and seem even in reverse they are running.
2. The belt keeps coming off..i notice the idler pulley has some play and the belt is nearing the top edge of this pulley. The bolts seem tight. Can this pulley be warped or is this another issue?
I notice the brake assembly deck is not keeping the pad flush to engine/blade pulleys?
Thanks in advance
 
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