If the pump was simply leaking, and still working, I would have simply resealed it.
Nowadays, MANY times your original part is better than parts "rebuilders" throw together, and the replacement pump MAY have had more hours of use and wear than yours.
The first thing to try when pulling to one side happens with one of these unique antique DEERE power steering systems is to LOOSEN the 4 bolts holding the steering valve and tap it slightly fore or aft to center the valve in neutral.
If this dosen't fix the "pulling to one side" problem, there's a "ramp" or "cam" and pin and spring mechanism inside the steering worm that create the motion to move the valve.
They wear, and chip and fail, causing erratic valve action, which causes the "pulling to one side" or weak steering in one direction.
It's too bad you didn't ask some questions here BEFORE your "mechanic" destroyed your tractor!
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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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