Drive belt on Husqvarna

So I was mowing tonight and my drive belt popped off I thought no biggy I'll put it back on well it popped off the fan pulley again and so I tried again and it still keeps popping off. My mower is a Husqvarna I've had it for 4 years and haven't had this problem until now any suggestions on why it's popping off?
 
Do you mean the belt from the engine to the hydrostatic? Worn belt is first choice. Next choice is that one of the idler pulleys is worn out. If you push the clutch down with the engine running the drive line will be quiet and when you let the clutch out everything underneath will make noise and hiss or rumble. You could have an alignment problem. Loose mount bolts holding tranny to frame. How in the world did this belt pop off without breaking the fan blade? Give us more information as you proceed.
 
Yes the belt from the engine to the hydrostatic. I have no clue how it popped off without breaking the fan all I know is when I looked underneath it the belt was around everything but the fan pulley. I'm guessing it's worn gonna replace it tomorrow and see if that solves the issue will keep you posted.
 
While you are under there....give each of those little idler pulleys a spin and a shake. They should all be silent. You can down load the PDF file for your machine on the Husqvarna web site. Look under your seat. You will need ALL of that information to get the correct one. Once you have the part numbers you can order them.
 

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