I thought by the looks of the picture the tractor was towing the other unit{tractor etc..} and maybe the tractor over heated the motor or transmission,which came a part than cause the fire.
For the main fire looks to be around the tractor transmission,also flames coming from the rear of the motor.
Now that must be some scary not knowing at any given moment something like that could happen.
Thank for the info.
Thomas..NH /w3tcompact/icons/wink.gif