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Backhoe dipper arm function not working

Andy Jones we have a 1962 John Deere 10:10 tractor with a 7:10 loader and believed to be a 50/51 backhoe. The dipper arm function is not working on the backhoe. When the lever is moved, it makes a whining noise and jams up. The hydrolic ram works. if we switch the hoses to another lever, this works fine. We think it is somewhere w/ in the lever or valve body but have had no luck. Controls are made by Cesna aircraft. Any help would be appreciated or if you know where we can find a schematic on the controls or troubleshooting chart, it would be great. Thank you so much!
Dale G. Basgall Will the ram pressurize in either direction or just when one or the other side is perssurized ? If only one function ie. dipper arm is giving you a problem then likely it is in the hydraulic control valve section that the lines are coming from and to the cylinder ports. Position the hoe so that there is little force on the dipper like hanging down, and see if you can move the dipper arm in either direction with a push pull force, there are line relief valves one on top of the valve and one on the bottom of the valve, they may have a broken spring in them or debris of some type holding the line relief in the open position. I will be glad to assist
Andrew Jones the ram seems to be functioning fine. we hooked the hose to another lever and the dipper arm worked fine. it seems to be somewhere with in the lever. I will have my father (the handy one) check the relief valves. If you have any other ideas, keep them coming. it is truely appreciated.

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