Then you have to ask about independent pto too. ;)
The first tractors had the shaft from the engine, the clutch, and then everything happening in the rear end - transmission, pto, and hydraulic pump.
So when you push in the clutch, -everything- stops running behind the engine.
They realized that wasn't so good, so they came up with other ways to power the hydraulic pump, closer to the engine not after the clutch. So now the hydraulics are live - always work when the engine is running.
Then they figured out to run 2 shafts, and 2 clutches, that release at different times for the transmission and pto. So when you push the clutch 1/2 way in the transmission clutch releases, but the pto clutch keeps spinning. So you have live pto. If you push the clutch all the way then both clutches release, and both the transmission and the pto stop. This is a live pto.
Then they figured well that is still interconnected a bit. So they came up with independent pto. This has the typical clutch for the transmission, and a totally seperate clutch, usually hand operated, for the pto all by itself. So you can shift either or both the transmission and the pto at any time and not affect the other at all.
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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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