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 - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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