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Discussion Starter #1
Model 345. Does the main drive belt from the motor to the deck drive pulley have an idler. New jd belt, comes off in higher grass. Nthanks.
 

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No, goes directly from the pto to the deck. Should be tight when you flip the tension arm, if not the belt is worn or the spring is broken. There's also some nylon bushings on the shaft that the deck pulley rotates on check them also I went through 2 sets in 20 years,I think there's 4 and they're only a couple of bucks.
 

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Thank you for the additional information.checked bushings and spring, appears ok. Maybe belt is just a bit short. New belt put on by seller, don’t know if it’s a proper jd belt or not.
 
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