Question about Craftsman 20 Hp 42" Deck Lawn Tractor

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I am putting a new belt on my deck, model 917.258540, i see how the braker for the mower pully will tighten when i engage the clutch, but after i disengage there is nothing pulling the bar back into a positionclose to the pully so the belt wont fly off, is this how it is supposed to be configured? also, any tips on putting the deck back on by myself...other than getting a friend to help? thanks Tom ps this is a 15.5 HP kohler engine

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The brakers on the pulleys should go against the pulley when disengaged & if you do one side at a time you can put deck back under yourself if i can further help e-mail me wade at wadembly@aol.com

Posted on Jun 28, 2009

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Hi Jeff, If you look at the deck, one or more of those pulleys is a tensioner, It pushes against the belt to tighten it, The rest of the pulleys can be identified by the fact that they only have a bolt through the middle, whereas the tensioner is mounted on an adjustable arm with a slot to allow adjustment. It should also be the only one that the belt doesn't go around the pully it just pushes on one side.If the tensioner arm is all the way to the end of the slot, the belt is streched and will need replaced but sounds like it may have come loose. Some of these decks also have a spring on the tensioner arm and those come off from a stick or other debris. Check it out and if you have a problem let me know and I will try to come up with a diagram. If your mower is that new there should be a belt diagram on the deck. i will need a model number of the deck or mower for that. Good luck!

Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

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Hi, you may have more than one problem. There should be one belt from the mower deck going to the electric clutch pulley which is on the engine shaft. On the shaft there are two pulleys, one belt comes from the mower deck, and the other comes from the transaxle pulley. check to see if your belts are in the right areas.

If this doesn’t work for you, please write back. Thanks,

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