Don't start or move the combine until you are sure everyone and everything is out of the way!
Turn off the engine and remove the key before refueling, cleaning, adjusting or lubricating the combine.
Solidly block or use the safety stands on the header before working under it.
Keep ladders, steps and platforms free from trash.
Equip your combine with at least two fire extinguishers - one near the cab and another where it can be reached from the ground.
Take a break now and then. Fatigue leads to accidents