Older combines with front engine compartments can be particularly susceptible to collecting debris. Examine exhaust or hot bearing surfaces because they can be ignition sources for dry, combustible material. Check the pressurized oil supply line to the turbocharger shaft for areas that may rub from wear and start an oil leak. Place wiring harnesses in proper holders. In addition to the combine, grain transport or pick-up trucks with exhaust systems below the chassis also can ignite field fires.
Catalytic converters operate at several hundred degrees.
Field fires are sometimes started with the passing of a truck. Flames may not be noticed for 15 to 30 minutes or longer. Because smoldering combustible material may not be noticed for some time, consider leaving the combine out of the machine shed when it first returns from the field. And, if field welding is to be done on equipment, wet down the area under and around the implement before welding as an added precaution.