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 - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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