Sounds like you have a high pressure to sump leak in the hydraulics. When the clutch is disengaged the trans pump stops. Under normal conditions the front reservoir and cooler hold enough oil to keep the main pump supplied. A high pressure leak will empty the reservoir and starve the main pump. Leak can be in any high pressure function (SCV, rockshaft, steering, brakes, diff lock, PTO). A simple check is to start the tractor when cold and let run for 15-30 minutes then feel for heat buildup in one of the functions. The warm function will be leaking internally. Good idea to put gauges on and test pto and main pump inlet pressures.
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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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