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John Deere Tractors Discussion Forum
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JD 2030 Hydraulic problems

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rcj94

12-27-2005 09:10:30




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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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JDknut

12-27-2005 09:20:09




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 Re: JD 2030 Hydraulic problems in reply to rcj94, 12-27-2005 09:10:30  
IF the pump is starved for oil, it might be the charge pump has issues which would cause the problems you refer to and fit in your theory. The charge pump supplies oil to the main pump and also lube oil for the tranny and diff. It often gets overlooked. Unfortunately you have to split the tractor to get to that bad boy. There are tests that you can do to see if that is the problem. A Deere repair manual is very helpful for that purpose and will help you decide if it is something you can handle or if you need professional help for that. Good luck.

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