All Super A tractors (built 1947-1954) had hydraulics. Farmall A tractors DID NOT have hydraulics (built 1939-1947). HOWEVER, Some of the VERY LATE Farmall "A" tractors in 1947 had a place for the hydraulic pump on the engine.
The casting code for the rear end you supplied .....not sure about that.
If you got the serial number off the rear of the tractor under the seat then it is possible it has been changed out at some time with a Super A rear end. What is the bolt pattern spacing on the rear final drives? That will tell if from an "A" or not. Also check cast codes on transmission case (probable cause for replacing rear end).
If you are talking about your engine block being blank on the flat spot near #1 spark plug (no serial number), then that is very possible the engine is from a Power Unit.
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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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