Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Will the machine run any at all with the PTO engaged? Does the engine die as soon as you pull the PTO switch?
This sounds like the seat safety switch is not working properly. Are you sitting all the way back in the seat? You aren't mowing on rough ground that might be bouncing you off the seat momentarily are you?
I believe that it is your seat safety switch that is causing this problem. Can you tell me how many wires are going to the seat safety?
Unplug the wiring going to the seat switch and see what happens. We may have to install a jumper wire in between the wires on the connector but try it first without the jumper.
Install a jumper wire in the connector that was plugged onto the seat switch. A small wire or paper clip can be used to do this, all we want to do is connect the wires in the plug.
Does your seat safety switch has two terminals or three on it?
So when you jumper the two wires and try to run it the engine dies when you unlock the parking brake. But the machine won't start at all when the wire is just unplugged with no jumper. Let's go ahead and hook everything back up and try to run the machine, try sitting in the center of the seat and see what happens.
Can you release the parking brake and drive the machine? Does the deck start to come on and load the engine then the engine dies? Does the engine die as soon as you pull the PTO switch as if you shut the engine off?