Until recently, manual transmissions were the norm for most wildfire control trucks. Automatic transmissions have a wide acceptance now for several reasons. A major advantage is the shorter learning curve for new operators. Also, some agencies have started using their wildland fire engines to tow trailers hauling other equipment. The automatic allows for greater start up torque and smoother shifting when towing. Oil is used to shift gears in the automatic transmission. The friction losses of this process heat the transmission fluid. Under certain operations, such as towing heavy loads, the oil temperatures may reach a point where the oil will break down. When this occurs, the result is a damaged transmission or a shorter life for one. It is important to design the transmission cooling system for these heavy-duty applications. This report discusses the transmission heat problems and potential solutions for preventing its occurrence.

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