The #10 checks should be cross port check valves. When the engine is off and you move the controls, nothing should move. You need to have hydraulic pressure to open the check on the opposite line so the return oil can pass back through the valve. They serve to keep the boom from dropping before lifting when you slowly shift the valve, also keep the cylinders from dropping uncontrolled by gravity when you activate lower/dump. I would swap with the check plugs from your accessory valve, as they are likely used very little.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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