Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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In answer to your question about the safety switches, no there is not a reset or a way to reset them. All that you can do is make certain that all control levers are in the proper positions for starting. If all you are getting is a small click when you engage the mower deck switch then it sounds like a battery issue. Did you have the battery load tested? It may not be holding up under a load which would explain the no start and the small click. If the battery is fully charged and holding up under a load and you engage the mower deck switch you should hear a very noticeable click from the PTO clutch more like a loud clunk. The first thing that I would do in this case is have the battery load tested.
If it had just started prior then it makes me think that you don't have all of the safety switches activated. I would have to go back and check all controls to make sure that they are in proper positions to allow the machine to start. If you have a volt meter you could do some voltage checks to help identify where the problem is actually at. It would require that you have access to the starter solenoid and the safety switches in order to do these tests or checks.