I don't like the alignment of the two idler pulleys. They are not level with the spindle pulleys. I have seen that one might be tilted, but it appears, from the pictures, that both are. Try bending them level and make sure they spin freely and quietly. Also, make sure the engage idler mounting plate moves freely.
Yes the pulley that has the bracket that moves when the blade is engaged is loose and lays down on deck I can lift up on it but when let go it just leans back down not sure if the bracket where the rod goes in needs to be bent to lift it up some? When I engage push lever handle down for engagement that pulley lifts up,disengage pulley leans down
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I did put on a little shorter belt and from just engaging it and leaving it in a few min then repeatly engaging and disengaging it feels alot tighter no speaking or smoking a little burn smell first few min with a new belt. Then when I disengage the pulleys stop then but the looser belt that would jump off I could hear pulleys turning like 10 seconds after disengaging. Not now though seems tighter. I haven't cut with it yet.
outdoorpowermike
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Might sound crazy but you need to replace the spindle brake shoes. Look at the brake shoes or pads that push against the right side spindle pulley and you will see deep groves in it. What happens is the deck belt gets pinched turning in oppiset dirrections and the belt will always come off. The brake pads keep the belt from touching at the flat idler pulley and the spindle pulley. If all belt guide are at the flat idlers are in the correct positions so belt can't come off this will fix your problem.
outdoorpowermike
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Also you can slowly pull pto handle back almost all the way but not complety and belt should not come off as a test the worn out brake pads, lets us know the outcome.
outdoorpowermike
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Thanks for a reply Freddie21. You are correct with angles of idlers. They have about a 1/4" lip that keeps belt on if brackets do bend some, normal after some time. Just like helping mower people. 32 years at outdoor power shop I've come across things most techs over look. I have comebacks like most shops but this is how I figure things out. Have a lot of customers come from other shops that have good techs but just don't see things and they get like time to throw the white flag in. I teach the young guys at the shop secrets most people will never know. But I won't tell them everything until they get stuck. Just ask and I'm at work to help. Retiring soon!