You probably know this, but scribe a mark across the valve and worm gear housing as a reference point, then just barely tap the housing to adjust it while watching the reference point. A few thousandths makes a difference. Could be the roll pin inside has a flat spot worn on it too and a worn pin can make centering perfectly hard to do. I've been in there and replaced the pin but it's been awhile. Maybe someone on the John Deere board can walk you through it if you can't get the valve to center the way you want it to be.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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