The shuttle valve is not too difficult to service. It is accessed through a hole in the Hydro housing that has a large pipe plug in it. when the snap ring comes off the usual symptom is that the tractor will not move forward from the neutral position until you first put it in reverse.
Another possibility it the drive control valve either is out of adjustment or has a spring problem. That is the valve that is activated when you move the speed control lever to either side before going forward or backwards. Try holding the speed control lever more to the side when slowing down and see if that changes things.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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