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Slow hydraulics on Ford 641D
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Posted by Hal/WA on June 12, 2006 at 19:52:34 from (66.45.175.118):
I own a Ford 641 Diesel tractor. It has a huge amount of hours on it, but keeps on running pretty good. I have had it for about 15 years and my Dad had it for maybe 10 years before that. It has a trip-bucket loader that operates from the tractor hydraulics through a Ford single spool accessory control valve. This spring I bought a box blade and I have been amazed by the ease that I can remove large rocks imbedded in a chunk of ground I hope to clear enough to plow and put into some kind of production. I have used the box blade many hours removing rocks and digging a couple of ditches since I bought it. I also have used the loader to move a bunch of dirt that I loosened with the box blade. It has been kind of fun and I have the area nearly ready to plow. My hydraulic system now seems to operate much slower than it did a couple of weeks ago. It will still lift the bucket filled with dirt, but it takes about 4 or 5 times as long. The box blade will still raise, but much slower than it used to. I checked the hydraulic oil and found that it was quite white and somewhat foamy, kind of like a thin vanilla milkshake. The reservoir also appeared to be a little overfull. I suspected water and drained the reservoir with the 3 point down and the loader all the way down. I refilled the reservoir with the proper Ford spec hydraulic oil and found that the 3 point and loader soon operated a little better than it had been, but still much slower than a couple of weeks ago. The tractor uses a 6 piston hydraulic pump mounted on the standard hydraulic manifold and the right side of the engine. I think I understand how the pump is supposed to operate, with a "wobble plate" pushing the pistons, which push the hydraulic oil out through the ball bearing style valves and out to the hydraulic manifold. Obviously the system is working somewhat, since the loader and 3 point will move, but I am wondering why it is working so much slower. To my knowledge there is no volume adjustment possible. The pump also doesn't sound any different than it ever did and neither the pump or the hydraulic manifold is leaking. Could some of the pistons in the hydraulic pump have siezed up in the pushed position? That would explain why the volume of pressurized hydraulic oil seems to be much less than before. Could this have been caused by the water contaminated hydraulic oil, or have the piston return springs broken? Should I remove the hydraulic pump? I doubt that it has ever been off the approximately 1960 tractor. I have never had a hydraulic pump apart before, but the directions in the manual suggest that it isn't too bad a job, and the only special tool needed is to remove the intake ball valve seats, which might not have to be done. Or should I have a good local hydraulic shop do the rebuild, partial rebuild or repair? Or should I look for some other problem that would cause the system to work so much slower? This tractor sits out all the time. I changed the hydraulic oil a couple of years ago and at that time the old oil was pretty milky. I suppose the water has leaked in through the loader cylinders, which point up. Or maybe someone has messed with the tractor.... I will be keeping a closer watch on the hydraulic oil and hope to build a shelter for the tractor. Nobody responded to these questions on the Ford board. Any hydraulic experts out there??? Thanks in advance!
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