Those valves are two way selector valves. They are push pull. Grab the knob and pull it one way and it directs oil to one circuit push it in and it directs oil to the other circuit. I see one of the valves is missing its knob. When you were digging one might have gotten bumped and is in the middle of the two circuits causing slow cylinder action. Make sure the valves are all the way in one direction and I bet your problem disappears. Your going to have to experiment to find out witch position the valves need to be. You can also remove them if you want as they serve no purpose other than connecting another cylinder in the circuit.
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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