It has a new belt on but when in off position, it has about 2 1/2" off slack and comes off the pulley.
The idler pulley is going back and forth.
There is a belt diagram and it should be good there.
What should I do?
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Comes off the pulley...which pulley?
When was the "new" belt put on?
Who put it on?
has it worked since the new belt was put on?
1)Belt is on the wrong side of an idler pulley...belt is routed wrong.
2)Wrong belt