Originally Posted by grenneam
Thanks for both of your replies. I did check the kill switch under the seat and it looks OK. I guess the odd part for me is, that in many cases, when the problem was occurring the engine would continue to run for a number of seconds (up to 15 or so) before stopping. It seemed to me that whatever went wrong had to do with something that got heated up while I was cutting my lawn. Like I said I ran the engine testerday with the brake dis-engaged, for 30 minutes or more and could not reproduce the problem. It's been raining here so I haven't been able to take the beast out on the lawn for a good test run. Maybe tomorrow. I'm going to change the transmission oil first. It sure doesn't look like any 10w30 I've ever seen.
Good Luck. Like Ridin Green says, you cant tell by looking at the switch under the seat, I had a brand new JD that would do the same thing. Figured it was the switch, wiggled it a little and then endend up squeezing the conntection together and then wraped it with electrical tape to secure the connection until the dealer replaced.