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Blades keep going out of time

Just replaced the timing belt. Everytime I set the blades to the respective 12/6 & 3/9 o'clock positions for timing, the blades will start to hit after about 8-10 seconds after turning them on. When you look at the blades, they are not longer in their set positions. The tensioner is set pretty tight, so I do not see how the belt could be slipping, plus it is a cogged belt. the blades are seated correctly on the keyways, so I know they are not slipping. I'm at a loss how the blades can just move like that magically.

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  • Garden Master
  • 2,478 Answers

What model?

Posted on May 12, 2014

Testimonial: "LX 255, 42" deck"

  • 3 more comments 
  • carolina_sun May 12, 2014

    John Deere

  • carolina_sun May 12, 2014

    Freedom Deck\

  • Dennis Key
    Dennis Key May 13, 2014

    Check for sheaved key on left pulley. It takes a key, the other 2 don't.

  • carolina_sun May 13, 2014

    I'll do that. I'll bet it fell out.

  • carolina_sun May 13, 2014

    Can you describe a bit where the sehaved key is located? I'm an Engineer, so I'll be pretty savvy with this. I assume you are talking about the timing pulley opposite the pulleys with the tensioner?


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Posted on Jan 02, 2017

  • 86 Answers

SOURCE: blades stop working

Does your mower have an electric clutch ? If so your problem is most likely a connection

Posted on May 12, 2009

  • 1 Answer

SOURCE: We have a brand new Craftsman 26 HP, 54

adjust the tension on the idler pully or refer to your manual

Posted on May 14, 2009

  • 10865 Answers

SOURCE: I have a craftsman riding lawn mover 42" model #917270812

Hi Paul It sounds like the belt is worn, stretched, or possibly just two long for your machine. Save yourself a lot of aggrivation by checking your operator manual and getting exactly the right belt for your mower.

You don't say how old your machine is but if it has been mowing for many, many hours, the tensioning spring may need to be replaced. If that is the case you can order a new one at

Posted on May 20, 2009

  • 95 Answers

SOURCE: blades became disengaged -- won't engage

Sometimes the belt can jump off one pulley and cause the problem,follow the belt around all the pulleys and see if it came off one.there may be a belt loosening lever on the lh side of the mower deck, if so unlock it and reroute the belt around the pulley. If you need to replace the belt the manual has a good description on how to do it and should take 30 min with only a couple of tools.

Posted on Jul 30, 2009

  • 138 Answers

SOURCE: My Swisher Rough Cut 12.5 HP 44 Inch mower - The

I dont believe there is a shear pin on your blade spindles, what I have found on these machines is the the spindle nuts on the balde spindles sometimes loosen or wear and no longer squeeze the pulley on the blade spindle. To make this process easy on your self you need to tighten these with a impact wrench. However if you dont have access to a impact wrench you can use hand tools and block the blades you are trying to tighten with a wooden block. Just make sure you block the blade you are trying to tighten

Posted on Aug 30, 2009

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