Hi Mtractor, on a single acting cylinder there is only one hydraulic line and when the control valve is opened in one direction the high pressure oil flows out extending the cylinder and in the other valve in the other direction allows oil to flow back into the hydraulic reservoir. The only requirements is that there has to be a weight on the cylinder to force the oil back into the reservoir. The first three front end loaders that we had only had single acting cylinders on the lift arms.
Re 464, normally the remotes are double acting. The single acting valve just has a different spool in it and that is why the other hole is plugged. There are youtube videos explaining operation the different types hydraulic valves. BTW the 464 hydraulics are open center.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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