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I bought the mower from someone since rearend isn't working,so I removed the battery, noticed the upper belt and idler pullery wheel went bad. How can the idler arm tighten the belt? Is idler spring missing on idler arm or not?

Model 13at608h016

http://www.mtdproducts.com/equipmen...Code=62&modelNumber=13at608h016&serialNumber= click on owners guide, then accept, download at bottom left of screen, see pages 18-20 & 32,33.

Thanks for information. I wonder what part number for spring to put on idler bracket. Is that part number 732-0384 spring extension for idler bracket to hold the belt?

I would remove deck after printing copy of parts & look for missing spring location.