What is the purpose of the bell crank in a 12N Crawler Tractor?

The bell crank plays a vital role in the steering and braking systems of the 12N Crawler Tractor. It acts as a lever that converts the motion from the operator's controls into the corresponding movements needed for steering and braking. When the operator turns the steering wheel or applies the brakes, the bell crank transmits this force, enabling the tractor to respond accurately and effectively. Therefore, its primary function is to facilitate the linkage and operation of these essential systems, ensuring the tractor is maneuverable and can stop when needed.

The other options do not reflect the function of the bell crank. Engine cooling, fuel flow regulation, and hydraulic pressure are managed by different components within the tractor's systems that are designed specifically for those tasks. The bell crank's unique design and position make it specifically suited for handling the mechanical actions necessary in steering and braking.