We recently painted our 3600 but didn't remove anything but dirt. Fuel lines, pump and filters stayed as is. After painting we cranked it and it cranked OK and ran for 30 minutes or so. When we pulled it into the lot to check the brakes, one of them grabbed and the engine died. It would not crank back. Checked diesel and it was OK, checked kill switch and it was OK, neutral switch was bypassed a long time ago so it was no an issue. We pulled it with another tractor and it cracked easily. Let it run and killed the engine. Would not crank with starter. Pulled it again and it cranked easily. It should be noted that the fuel pump is weak and we use starter fluid most time to crank it but that didn't help this time. I am going to have the pump rebuilt but could that be causing the problem with the starter not being able to crank it but pulling it off does? Anyone have a suggestion as to what else it could be?