They look to be open center. If when they are off you can blow through the input port, and have air at the return port (to reservoir, or other valve input as shown), they are open center. If a hose from the IH system to the Gresen system is collapsed internally, it will act as though it is lifting a massive load. Check that by hooking the input hose to the output hose with a coupling, It should be full flow, no engine stress, no pressure. If there is, the pressure hose may be bad. The one way cylinders should not be leaking down as I stated in my first response. We will get it right! Jim
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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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