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I don't see how mowing could cause the 3pt. not to work. The reason they don't work on the David Brown tractors is because of neglect/dirt in the hydraulic system. You need to remove the cover. Remove the slotted caps on the spool valves one at a time, and pull them out. Clean them and make sure they move freely. Be careful not to lose any small pieces. If I remember correctly, the caps are holding against spring pressure. It will fly apart if you are not careful as you take them out. You need to make a wooden dowel which is tapered on one end. Gently force it into the spool after you remove the slotted cap, then you will be able to pull the spool out. Your next step will be to replace the hytran filter and keep the fluid clean. Elmer is the pro here, he taught me how to do this. He may suggest other things for you to check. I would suggest an owners manual or repair manual if you are not familiar with the hydraulic 3pt. system.
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