Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Does the machine cut off when the parking brake is disengaged or only when the drive levers are moved into drive position? Can you engage the mower deck and the machine continue to run?
I would focus on the seat safety switch. Try unplugging the connector or wires that goes to that switch and see what happens. If the machine still does the same thing then you can insert a jumper wire between the two terminals in the connector and try it.