My L2600 in sitting in a shale pit - won't start. I have a bucket full of shale in the loader and a trailer with two buckets full of shale. I tried to drive away and forgot i had the parking brake on and stalled hard. Now it won't start, just clicks once strongly when the key is turned, like it would with a dead battery. I brought my lawn tractor to it and jumped it for about 20 minutes still just clicks, any ideas where to go next?