I just bought a used 873C with the 73.5 diesel engine. It will run for about 15 minutes and then it just shuts down. If I try to restart it the engine will crank but not start. If I let it sit for about 10 minutes it will start right up and run for a short time and then shut down again. This pattern seams to continue. The longer I wait the longer it seems to run on the restart. When it is running it runs fine. I replaced the fuel filter and it has plenty of fuel (almost a full tank). Any help to get me started would be appreciated. I believe the year to be a 1997. I have been reading some of the posts but have not come across this.