Looking at the difference in sizes of the two clutches would make one wonder how come the TA can get by with a smaller disk.
The reason is that the TA clutch does not have to hold as much torque as the main clutch because of the gear reduction in the TA. The power is transmitted through the TA gears to the input shaft of the transmission. As the TA reduces the output shaft speed the torque entering the transmission is greater than the torque coming through the main clutch. Since torque is increased as speed is decreased, the opposite is also true. The gearing in the TA has the effect of trying to increase the speed of the TA clutch assembly and thus reducing the torque available. The result is that the TA clutch, even though it is smaller, is able to handle as much HP as the main clutch.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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