There are 2 basic systems. One is the original mechanical TA in SMTA F300 350 300U 350U. and small framed tractors. It relies on a direct drive clutch, and a Sprag (one way) clutch. See a You tube of its operation. It has no retarding action at all, and will allow dangerous down hill experiences. They work well, and Mine is still working with no repair and heavy use from 1957. The other is similar, but uses hydraulic pressure to apply the front clutch, and has a sprag clutch as well. But the sprag clutch has a piggyback multi disc hydraulic clutch that is applied to prevent coasting down hills. It is definitely not to be used for engine braking. It is not strong enough to hold engine driving forces, or decelleration speed changes. Jim
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