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JD 2030 Hydraulic problems
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Posted by rcj94 on December 27, 2005 at 09:10:30 from (220.127.116.11):
I have a 73 2030 with a hydraulic system problem. No reverser, no Hi/Lo shift, single rear live PTO. After running for a few min. the system starts to chatter, line vibrate, using loader, 3pt, or just sitting there doing nothing. I have changed filter, screen, and fluid. I have looked at filter by pass valve, several pistons in front pump and the check valve in the supply lone from rear pump to front pump. I think front pump is starving for fluid causing chatter. I took out the plug on the right side of clutch housing which my book says should be a surge relief valve. I found no valve but this bore was full of chunky greasy gunk including some metal particles. I suspect these are parts of the brake linings. SO I cleaned this bore out best I could, and then removed a little cast cover directly above this plug. It holds the right bushing for steering pitman arm. So I then discover the hole I just cleaned out is connected to this cavity directly below the (power) steering valve assembly. The book tells me pressure oil goes into the power steering assembly from the main pump and then drains back to the sump - presumably through this cavity somehow, and the hole full of nasty junk I just cleaned.
What do you all think about my theory that the chatter is caused by oil getting pumped out of the sump into the system and there being some plugged return lines/galleys that prevent a stable supply of return oil to the transmission pump? Any ideas about how to clean out the system (parts in the case) short of splitting the tractor? I am going to take out the cooler and reservoir to clean them, but I can't think of a good way to clean the gunk out of return passages in the case and I can't see how return oil from the power steering gets out of the cavity I previously described. Any insights are welcome. Thanks.
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