The shuttle valve is not too difficult to service. It is accessed through a hole in the Hydro housing that has a large pipe plug in it. when the snap ring comes off the usual symptom is that the tractor will not move forward from the neutral position until you first put it in reverse.
Another possibility it the drive control valve either is out of adjustment or has a spring problem. That is the valve that is activated when you move the speed control lever to either side before going forward or backwards. Try holding the speed control lever more to the side when slowing down and see if that changes things.
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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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