The final drives are an important part of the drive train. They're the components that apply driving force to the wheels or tracks.
The final drives of a track-type tractor differ somewhat, but they perform the same function. They reduce rotating speed and increase torque. In fact, this is where the greatest torque rise occurs...in the gears. That allows these components ahead of the final drives to be smaller, which saves weight and space.
There are four types of final drives used in Cat machines: