It is my understanding that an overrunning clutch only "grabs" in one direction, sort of like a ratchet, so when the tractor's going down a hill it can go faster than the engine would be driving it on flat ground at a given rpm, which can lead to a runaway situation on a steep hill. The ORC S-O-S transmissions would still limit forward speed on a downhill in certain gears because the ORC only came into play when the number one servo was in one of two possible states. Someone else will probably chime in with the info on whether it would overrun when the number 1 servo was pressurized or whether it was when it was not pressurized, but I haven't memorized that part of the design.
A direct drive clutch is just that, direct, like a standard manual transmission clutch, so when it's engaged the engine will not only drive it forward, it will also limit the forward speed in a down hill situation.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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