The pulley appears to be loose.
SOURCE: G-110 deck belt keeps jumping off pulleys
check for a broken belt tension er or maybe grass clippings under belt area, check for a broken or loose pulley bearing, even a bent shaft on the deck.
SOURCE: cub cadet rzt 50, hit stump, blades wont engage but not bent
The blades on this cub cadet are activated with air pressure. Chances are that when you hit that stump, you either blew a fuse or the control module that allows the blades to spin. Begin by checking the fuses. J.
Hello,
My name is Dane and I am going to help you solve your problem. You said that the "Pulley" is loose when the blades are disengaged. I hope you meant that the belt is loose, because the pulley should never be loose. If it is loose, you should remove the pulley and make sure the KEY inside the center hole is still ok. Sometimes when the pulley gets loose it chews up the KEY and allows the pulley to turn on the crank. If the KEY is ok, just reinstall the pulley and tighten it.
I believe that your belt is probably just stretched and worn. The mower deck belt gets it's tension from lowering the mower deck. the lower the deck the tighter the belt. Just replace the belt. I hope I've helped! Thank you! Dane
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