If you are speaking about the cap where you check/fill the fluid level on the pump, take a look and see if the "Baffle" [small piece that resembles a thimble] that is attached to the removable cap is missing. My 641 would "puke" all the oil out through the tiny hole over time and found the baffle had come loose and was in the bottom of the sump.
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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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