My PTO would cut out after riding less than 1 minute. Traced the trouble to a defective seat safety switch. My switch worked fine for 4 years, but started to cause a safety cut off of the PTO in year 5. You confirm your seat switch is failing by removing both wire connected to it. One wire is engine cutoff and one is PTO cutoff. If your PTO problem goes away, its the seat switch causing the problem.