Modern combines are amazing pieces of machinery. The start of the harvest season is signaled as these huge gleaming machines come out of storage and head towards the fields. At the beginning of the season they are often as shiny as a sports car. No surprise for an item that can easily cost more than $200,000. But by the time the harvest is over the shiny paint is covered by grime and dust. Small pieces of crop debris have accumulated in the machines many nooks and crannies. Mix in complex electronics, flammable fuel and hydraulic oil and it only takes a spark to turn this magnificent machine into a charred hulk.

Every year in the US there are around 700 combine fires. There are some simple steps to prevent many of these fires.

Fires need three things to start, combustible material, oxygen and a source of ignition. The fuel, hydraulic oil and accumulated plant material can provide plenty of combustible material. Electrical shorts and over-heated bearings can provide a significant source of ignition.

Some fires are the result of electrical shorts. Wiring that is too close to heat sources may have insulation that is cracked or melted. Improperly routed wiring may come in contact with moving parts. Rodents may take up lodging during the off-season and cause damage. Make sure all insulation and heat shielding is in place. If repairs call for replacing wiring harnesses make sure it is routed properly.

All fuel and hydraulic lines should be periodically examined for leaks. When refueling make sure there are no open flames and shut down running motors.

Clean off accumulated debris daily and check exposed shafts for wrapped plant material. Preferably, this should be done at the end of the day rather that the beginning. At the end of the day you may detect a problem area while it is still hot.

Experts recommend two items of safety equipment to reduce the damage of combine fires. The first item is a 10 pound ABC-type fire extinguisher, every combine should carry two of them. If you think you smell something burning, before you start opening panels, get the fire extinguisher. Opening the panel or access hatch may introduce enough air that a smoldering problem will burst into flame. The second piece of recommended equipment is a cell phone to call for emergency services.