Posted by JDseller on July 03, 2011 at 23:00:39 from (208.126.196.144):
In Reply to: 4020 hydrolics posted by randy kunkel on July 02, 2011 at 18:24:14:
Bob and TX Jim are right on these hydraulic systems. The high pressure side is exactly the same. The low pressure side is way different. So we all agree on that.
Now look at my statement. "It is not uncommon for a power shift to develop these type of leaks" I could have stated that better as both transmission types can commonly have a high pressure leak. Here in north east Iowa there where a high percentage of the later 4020s sold with the power shift transmission. I have noticed in my working on them (30 plus years and JD certified on them) that the power shift tractors seem to get more high pressure leaks than the Synco-range ones. As to the why I don"t know. They are basically the same system on the high pressure side. Maybe more of them are used on loaders??? Don"t have a good answer but I have noticed that.
BOB I did not say the transmission was more likely to have a high pressure leak. I can see how I wrote it that you could read it that way.
Randy: your problem is not likely water after three changes. I would bet that you have a high pressure leak. As several of us have stated run it and look for things heating up. Then you can get back to us on here about how to check the part of the system you think is causing the problem.
You could have a leak in the charge side that is dumping all of the oil back into the sump. Usually this type of leak will be there all of the time, not changing with temperature. You would need to plumb a gauge into the charge pressure side to really tell.
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