Yes, the roll pin is in and I have adjusted the needle valve in and out and it did not affect the pressure. It did affect the speed of the shift though as it is supposed to. However, when I disassembled the clutch control valve I found that the small orfice behind the check ball located at the back of the bore of the pilot control valve was plugged solid. I think that this may have stopped oil from opening the bypass valve and letting full pressure to the clutches and check plug, yet I believe that it should have worked anyway in the neutral position. I decided since this was plugged that I better get a new screen and some new o rings for the clutch control valve before installing it back on the tractor and trying it out. I will also check out the line routing.
Do you know if pressurizing the clutch control valve with air will activate the clutches? I had put 100 psi on the port that feeds the clutch valve from the pump and I heard air leaking around the clutch dump spool in all positions. I would think in neutral there should be no leaks and should have been able to read pressure on the gauge at the test port. Thanks again for your input.
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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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