Mower deck belt slipping off my 1990 Murray 12hp 38"cut

[bobbygl]

My deck belt keeps slipping off my Murray 12hp 38"cut. Bought it used it runs great but need some help please.

 

[Nwatson99]

Maybe the belt is stretched and needs replaced, also inspect the pulleys and make sure there are no damage to them.

 

[SeniorCitizen]

Check the pivot point of the idler belt tension bracket for wear. If the pivot point is worn too bad it will allow the idler pulley to be out of alignment with the other pulleys and cause the belt to come off. That pivot mounting point takes a real beating so with the belt off raise the pulley/bracket up and down to check for loose. OR, when the belt is on and PTO engaged, kill the engine then look at the belt / pulley alignment with PTO engaged and tension remaining on the belt.