You have a bad belt, or a bad pulley. Check both for excessive wear, i.e. wear spots on belt, tears , cracks. On pulley wear spots where belt rides ,bent pulley, ripped metal. You should also check to see if your belt guides are in place. Good Luck Friend.
SOURCE: I can not get my mower deck to turn when I pull
Your switch could be bad, or the voltage needed to turn on the PTO may not be up to par, or you may have a safety switch that won't let you start the PTO. I'd start with the safety switches.
SOURCE: cub cadet mower pto will not stay engaged while
be sure your battery is good and your system is chargingning the battery while run
SOURCE: PTO belt Installation diagram for cub cadet
You can find a diagram here... www.partstree.com but you will have to use the correct model number that is under the seat. Click on Cub Cadet, then enter the model number. That will give you all of that mowers diagrams
SOURCE: Trying to put on mower deck belt for cub cadet
Visit this web site http://www.partstree.com/parts/
you can pull up your Cub
SOURCE: cub cadet pto won,t stay engaged
Sounds more like a PTO clutch failure, rather than the switch. The clutch is mounted on the engine shaft, between the hydrostatic drive pulley (nearest the chassis) and the mower deck belt pulley (farther from the chassis).
Since it's an expensive part, make sure the problem isn't in the switch or wiring first. You could do that by probing the wires to the PTO clutch with an automotive test light - they are inexpensive and handy. Clip the ground wire of the test light to the chassis, and probe the hot wire to the clutch (it's the one that doesn't connect to ground) when the engine is running and the PTO switch is engaged. Obviously a helper has to be in the seat, and you should be careful doing this. If the light glows brightly, and the clutch doesn't engage, you definitely have a bad clutch.
Good luck! Please rate my answer if helpful, thanks.
Comment here and Ill assist further if need be.
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