Usually there' a bad safety switch causing the problem. These are usually gray in color and look like a push button. Like the one you can easily see under the seat. Also a bad PTO switch will do this. There even a safety switch attached to the transmission on a JD tractor! See the loose wire?
My husbands guess is to check to make sure the belts are on the pulleys...ot , as the previous person said, the PTO switch.
There are a lot of safety switches. For example when my John Deere is running and I get off the seat the mower automatically stops. I would check to make sure all the saftey connections are connected.
My husband's guess is the PTO switch has a short in it. You may need to replace the switch.
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